using Microsoft.Win32.SafeHandles;

using System;

using System.Diagnostics;

using System.Globalization;

using System.IO;

using System.Management;

using System.Runtime.InteropServices;

using System.Threading;

using System.Timers;

using System.Windows.Forms;

using System.Collections.Generic;

using System.Drawing;

using System.Text.RegularExpressions;

namespace GenericHid

{

	///<summary>

	/// Project: GenericHid

	///

	/// ***********************************************************************

	/// Software License Agreement

	///

	/// Licensor grants any person obtaining a copy of this software ("You")

	/// a worldwide, royalty-free, non-exclusive license, for the duration of

	/// the copyright, free of charge, to store and execute the Software in a

	/// computer system and to incorporate the Software or any portion of it

	/// in computer programs You write.

	///

	/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

	/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

	/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

	/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

	/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

	/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

	/// THE SOFTWARE.

	/// ***********************************************************************

	///

	/// Author

	/// Jan Axelson

	///

	/// This software was written using Visual Studio Express 2012 for Windows

	/// Desktop building for the .NET Framework v4.5.

	///

	/// Purpose:

	/// Demonstrates USB communications with a generic HID-class device

	///

	/// Requirements:

	/// Windows Vista or later and an attached USB generic Human Interface Device (HID).

	/// (Does not run on Windows XP or earlier because .NET Framework 4.5 will not install on these OSes.)

	///

	/// Description:

	/// Finds an attached device that matches the vendor and product IDs in the form's

	/// text boxes.

	///

	/// Retrieves the device's capabilities.

	/// Sends and requests HID reports.

	///

	/// Uses the System.Management class and Windows Management Instrumentation (WMI) to detect

	/// when a device is attached or removed.

	///

	/// A list box displays the data sent and received along with error and status messages.

	/// You can select data to send and 1-time or periodic transfers.

	///

	/// You can change the size of the host's Input report buffer and request to use control

	/// transfers only to exchange Input and Output reports.

	///

	/// To view additional debugging messages, in the Visual Studio development environment,

	/// from the main menu, select Build > Configuration Manager > Active Solution Configuration

	/// and select Configuration > Debug and from the main menu, select View > Output.

	///

	/// The application uses asynchronous FileStreams to read Input reports and write Output

	/// reports so the application's main thread doesn't have to wait for the device to retrieve a

	/// report when the HID driver's buffer is empty or send a report when the device's endpoint is busy.

	///

	/// For code that finds a device and opens handles to it, see the FindTheHid routine in frmMain.cs.

	/// For code that reads from the device, see GetInputReportViaInterruptTransfer,

	/// GetInputReportViaControlTransfer, and GetFeatureReport in Hid.cs.

	/// For code that writes to the device, see SendInputReportViaInterruptTransfer,

	/// SendInputReportViaControlTransfer, and SendFeatureReport in Hid.cs.

	///

	/// This project includes the following modules:

	///

	/// GenericHid.cs - runs the application.

	/// FrmMain.cs - routines specific to the form.

	/// Hid.cs - routines specific to HID communications.

	/// DeviceManagement.cs - routine for obtaining a handle to a device from its GUID.

	/// Debugging.cs - contains a routine for displaying API error messages.

	/// HidDeclarations.cs - Declarations for API functions used by Hid.cs.

	/// FileIODeclarations.cs - Declarations for file-related API functions.

	/// DeviceManagementDeclarations.cs - Declarations for API functions used by DeviceManagement.cs.

	/// DebuggingDeclarations.cs - Declarations for API functions used by Debugging.cs.

	///

	/// Companion device firmware for several device CPUs is available from www.Lvr.com/hidpage.htm

	/// You can use any generic HID (not a system mouse or keyboard) that sends and receives reports.

	/// This application will not detect or communicate with non-HID-class devices.

	///

	/// For more information about HIDs and USB, and additional example device firmware to use

	/// with this application, visit Lakeview Research at http://Lvr.com

	/// Send comments, bug reports, etc. to jan@Lvr.com or post on my PORTS forum: http://www.lvr.com/forum

	///

	/// V6.2

	/// 11/12/13

	/// Disabled form buttons when a transfer is in progress.

	/// Other minor edits for clarity and readability.

	/// Will NOT run on Windows XP or earlier, see below.

	///

	/// V6.1

	/// 10/28/13

	/// Uses the .NET System.Management class to detect device arrival and removal with WMI instead of Win32 RegisterDeviceNotification.

	/// Other minor edits.

	/// Will NOT run on Windows XP or earlier, see below.

	///

	/// V6.0

	/// 2/8/13

	/// This version will NOT run on Windows XP or earlier because the code uses .NET Framework 4.5 to support asynchronous FileStreams.

	/// The .NET Framework 4.5 redistributable is compatible with Windows 8, Windows 7 SP1, Windows Server 2008 R2 SP1,

	/// Windows Server 2008 SP2, Windows Vista SP2, and Windows Vista SP3.

	/// For compatibility, replaced ToInt32 with ToInt64 here:

	/// IntPtr pDevicePathName = new IntPtr(detailDataBuffer.ToInt64() + 4);

	/// and here:

	/// if ((deviceNotificationHandle.ToInt64() == IntPtr.Zero.ToInt64()))

	/// For compatibility if the charset isn't English, added System.Globalization.CultureInfo.InvariantCulture here:

	/// if ((String.Compare(DeviceNameString, mydevicePathName, true, System.Globalization.CultureInfo.InvariantCulture) == 0))

	/// Replaced all Microsoft.VisualBasic namespace code with other .NET equivalents.

	/// Revised user interface for more flexibility.

	/// Moved interrupt-transfer and other HID-specific code to Hid.cs.

	/// Used JetBrains ReSharper to clean up the code: http://www.jetbrains.com/resharper/

	///

	/// V5.0

	/// 3/30/11

	/// Replaced ReadFile and WriteFile with FileStreams. Thanks to Joe Dunne and John on my Ports forum for tips on this.

	/// Simplified Hid.cs.

	/// Replaced the form timer with a system timer.

	///

	/// V4.6

	/// 1/12/10

	/// Supports Vendor IDs and Product IDs up to FFFFh.

	///

	/// V4.52

	/// 11/10/09

	/// Changed HIDD_ATTRIBUTES to use UInt16

	///

	/// V4.51

	/// 2/11/09

	/// Moved Free_ and similar to Finally blocks to ensure they execute.

	///

	/// V4.5

	/// 2/9/09

	/// Changes to support 64-bit systems, memory management, and other corrections.

	/// Big thanks to Peter Nielsen.

	///

	/// </summary>

	internal class FrmMain

		: Form

	{

		#region '"Windows Form Designer generated code "'

		public FrmMain()

		//: base()

		{

			// This call is required by the Windows Form Designer.

			InitializeComponent();

		}

		// Form overrides dispose to clean up the component list.

		protected override void Dispose(bool Disposing1)

		{

			if (Disposing1)

			{

				if (components != null)

				{

					components.Dispose();

				}

			}

			base.Dispose(Disposing1);

		}

		// Required by the Windows Form Designer

		private System.ComponentModel.IContainer components;

		public System.Windows.Forms.ToolTip ToolTip1;

		public System.Windows.Forms.TextBox TxtBytesReceived;

		public System.Windows.Forms.GroupBox FraBytesReceived;

		public System.Windows.Forms.CheckBox ChkAutoincrement;

		public System.Windows.Forms.ComboBox CboByte1;

		public System.Windows.Forms.ComboBox CboByte0;

		public System.Windows.Forms.GroupBox FraBytesToSend;

		public System.Windows.Forms.ListBox LstResults;

		// NOTE: The following procedure is required by the Windows Form Designer

		// It can be modified using the Windows Form Designer.

		// Do not modify it using the code editor.

		internal System.Windows.Forms.GroupBox fraInputReportBufferSize;

		internal System.Windows.Forms.TextBox txtInputReportBufferSize;

		internal System.Windows.Forms.Button cmdInputReportBufferSize;

		internal System.Windows.Forms.GroupBox fraDeviceIdentifiers;

		internal System.Windows.Forms.Label lblVendorID;

		internal System.Windows.Forms.TextBox txtVendorID;

		internal System.Windows.Forms.Label lblProductID;

		internal System.Windows.Forms.TextBox txtProductID;

		internal System.Windows.Forms.Button cmdFindDevice;

		private Button cmdGetInputReportInterrupt;

		public GroupBox fraInterruptTransfers;

		private Button cmdSendOutputReportControl;

		private Button cmdGetInputReportControl;

		public GroupBox fraControlTransfers;

		private Button cmdGetFeatureReport;

		private Button cmdSendFeatureReport;

		private Button cmdPeriodicTransfers;

		public GroupBox fraSendAndGetContinuous;

		private RadioButton radFeature;

		private RadioButton radInputOutputControl;

		private RadioButton radInputOutputInterrupt;

        private TreeView treeViewDevices;

		private Button cmdSendOutputReportInterrupt;

		[System.Diagnostics.DebuggerStepThrough()]

		private void InitializeComponent()

		{

            this.components = new System.ComponentModel.Container();

            this.ToolTip1 = new System.Windows.Forms.ToolTip(this.components);

            this.FraBytesReceived = new System.Windows.Forms.GroupBox();

            this.TxtBytesReceived = new System.Windows.Forms.TextBox();

            this.FraBytesToSend = new System.Windows.Forms.GroupBox();

            this.ChkAutoincrement = new System.Windows.Forms.CheckBox();

            this.CboByte1 = new System.Windows.Forms.ComboBox();

            this.CboByte0 = new System.Windows.Forms.ComboBox();

            this.LstResults = new System.Windows.Forms.ListBox();

            this.fraInputReportBufferSize = new System.Windows.Forms.GroupBox();

            this.cmdInputReportBufferSize = new System.Windows.Forms.Button();

            this.txtInputReportBufferSize = new System.Windows.Forms.TextBox();

            this.fraDeviceIdentifiers = new System.Windows.Forms.GroupBox();

            this.txtProductID = new System.Windows.Forms.TextBox();

            this.lblProductID = new System.Windows.Forms.Label();

            this.txtVendorID = new System.Windows.Forms.TextBox();

            this.lblVendorID = new System.Windows.Forms.Label();

            this.cmdFindDevice = new System.Windows.Forms.Button();

            this.cmdSendOutputReportInterrupt = new System.Windows.Forms.Button();

            this.cmdGetInputReportInterrupt = new System.Windows.Forms.Button();

            this.fraInterruptTransfers = new System.Windows.Forms.GroupBox();

            this.cmdPeriodicTransfers = new System.Windows.Forms.Button();

            this.cmdSendOutputReportControl = new System.Windows.Forms.Button();

            this.cmdGetInputReportControl = new System.Windows.Forms.Button();

            this.fraControlTransfers = new System.Windows.Forms.GroupBox();

            this.cmdGetFeatureReport = new System.Windows.Forms.Button();

            this.cmdSendFeatureReport = new System.Windows.Forms.Button();

            this.fraSendAndGetContinuous = new System.Windows.Forms.GroupBox();

            this.radFeature = new System.Windows.Forms.RadioButton();

            this.radInputOutputControl = new System.Windows.Forms.RadioButton();

            this.radInputOutputInterrupt = new System.Windows.Forms.RadioButton();

            this.treeViewDevices = new System.Windows.Forms.TreeView();

            this.FraBytesReceived.SuspendLayout();

            this.FraBytesToSend.SuspendLayout();

            this.fraInputReportBufferSize.SuspendLayout();

            this.fraDeviceIdentifiers.SuspendLayout();

            this.fraInterruptTransfers.SuspendLayout();

            this.fraControlTransfers.SuspendLayout();

            this.fraSendAndGetContinuous.SuspendLayout();

            this.SuspendLayout();

            //

            // FraBytesReceived

            //

            this.FraBytesReceived.BackColor = System.Drawing.SystemColors.Control;

            this.FraBytesReceived.Controls.Add(this.TxtBytesReceived);

            this.FraBytesReceived.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.FraBytesReceived.ForeColor = System.Drawing.SystemColors.ControlText;

            this.FraBytesReceived.Location = new System.Drawing.Point(495, 353);

            this.FraBytesReceived.Name = "FraBytesReceived";

            this.FraBytesReceived.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.FraBytesReceived.Size = new System.Drawing.Size(112, 136);

            this.FraBytesReceived.TabIndex = 4;

            this.FraBytesReceived.TabStop = false;

            this.FraBytesReceived.Text = "Bytes Received";

            //

            // TxtBytesReceived

            //

            this.TxtBytesReceived.AcceptsReturn = true;

            this.TxtBytesReceived.BackColor = System.Drawing.SystemColors.Window;

            this.TxtBytesReceived.Cursor = System.Windows.Forms.Cursors.IBeam;

            this.TxtBytesReceived.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.TxtBytesReceived.ForeColor = System.Drawing.SystemColors.WindowText;

            this.TxtBytesReceived.Location = new System.Drawing.Point(18, 24);

            this.TxtBytesReceived.MaxLength = 0;

            this.TxtBytesReceived.Multiline = true;

            this.TxtBytesReceived.Name = "TxtBytesReceived";

            this.TxtBytesReceived.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.TxtBytesReceived.Size = new System.Drawing.Size(72, 96);

            this.TxtBytesReceived.TabIndex = 5;

            //

            // FraBytesToSend

            //

            this.FraBytesToSend.BackColor = System.Drawing.SystemColors.Control;

            this.FraBytesToSend.Controls.Add(this.ChkAutoincrement);

            this.FraBytesToSend.Controls.Add(this.CboByte1);

            this.FraBytesToSend.Controls.Add(this.CboByte0);

            this.FraBytesToSend.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.FraBytesToSend.ForeColor = System.Drawing.SystemColors.ControlText;

            this.FraBytesToSend.Location = new System.Drawing.Point(612, 235);

            this.FraBytesToSend.Name = "FraBytesToSend";

            this.FraBytesToSend.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.FraBytesToSend.Size = new System.Drawing.Size(160, 136);

            this.FraBytesToSend.TabIndex = 1;

            this.FraBytesToSend.TabStop = false;

            this.FraBytesToSend.Text = "Bytes to Send";

            //

            // ChkAutoincrement

            //

            this.ChkAutoincrement.BackColor = System.Drawing.SystemColors.Control;

            this.ChkAutoincrement.Cursor = System.Windows.Forms.Cursors.Default;

            this.ChkAutoincrement.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.ChkAutoincrement.ForeColor = System.Drawing.SystemColors.ControlText;

            this.ChkAutoincrement.Location = new System.Drawing.Point(8, 96);

            this.ChkAutoincrement.Name = "ChkAutoincrement";

            this.ChkAutoincrement.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.ChkAutoincrement.Size = new System.Drawing.Size(201, 35);

            this.ChkAutoincrement.TabIndex = 6;

            this.ChkAutoincrement.Text = "Autoincrement values";

            this.ChkAutoincrement.UseVisualStyleBackColor = false;

            //

            // CboByte1

            //

            this.CboByte1.BackColor = System.Drawing.SystemColors.Window;

            this.CboByte1.Cursor = System.Windows.Forms.Cursors.Default;

            this.CboByte1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;

            this.CboByte1.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.CboByte1.ForeColor = System.Drawing.SystemColors.WindowText;

            this.CboByte1.Location = new System.Drawing.Point(8, 64);

            this.CboByte1.Name = "CboByte1";

            this.CboByte1.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.CboByte1.Size = new System.Drawing.Size(101, 22);

            this.CboByte1.TabIndex = 3;

            //

            // CboByte0

            //

            this.CboByte0.BackColor = System.Drawing.SystemColors.Window;

            this.CboByte0.Cursor = System.Windows.Forms.Cursors.Default;

            this.CboByte0.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;

            this.CboByte0.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.CboByte0.ForeColor = System.Drawing.SystemColors.WindowText;

            this.CboByte0.Location = new System.Drawing.Point(8, 24);

            this.CboByte0.Name = "CboByte0";

            this.CboByte0.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.CboByte0.Size = new System.Drawing.Size(101, 22);

            this.CboByte0.TabIndex = 2;

            //

            // LstResults

            //

            this.LstResults.BackColor = System.Drawing.SystemColors.Window;

            this.LstResults.Cursor = System.Windows.Forms.Cursors.Default;

            this.LstResults.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.LstResults.ForeColor = System.Drawing.SystemColors.WindowText;

            this.LstResults.HorizontalScrollbar = true;

            this.LstResults.ItemHeight = 14;

            this.LstResults.Location = new System.Drawing.Point(12, 494);

            this.LstResults.Name = "LstResults";

            this.LstResults.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.LstResults.Size = new System.Drawing.Size(760, 256);

            this.LstResults.TabIndex = 0;

            //

            // fraInputReportBufferSize

            //

            this.fraInputReportBufferSize.Controls.Add(this.cmdInputReportBufferSize);

            this.fraInputReportBufferSize.Controls.Add(this.txtInputReportBufferSize);

            this.fraInputReportBufferSize.Location = new System.Drawing.Point(623, 44);

            this.fraInputReportBufferSize.Name = "fraInputReportBufferSize";

            this.fraInputReportBufferSize.Size = new System.Drawing.Size(149, 79);

            this.fraInputReportBufferSize.TabIndex = 9;

            this.fraInputReportBufferSize.TabStop = false;

            this.fraInputReportBufferSize.Text = "Input Report Buffer Size";

            //

            // cmdInputReportBufferSize

            //

            this.cmdInputReportBufferSize.Location = new System.Drawing.Point(6, 47);

            this.cmdInputReportBufferSize.Name = "cmdInputReportBufferSize";

            this.cmdInputReportBufferSize.Size = new System.Drawing.Size(136, 26);

            this.cmdInputReportBufferSize.TabIndex = 1;

            this.cmdInputReportBufferSize.Text = "Change Buffer Size";

            this.cmdInputReportBufferSize.Click += new System.EventHandler(this.cmdInputReportBufferSize_Click);

            //

            // txtInputReportBufferSize

            //

            this.txtInputReportBufferSize.Location = new System.Drawing.Point(6, 21);

            this.txtInputReportBufferSize.Name = "txtInputReportBufferSize";

            this.txtInputReportBufferSize.Size = new System.Drawing.Size(56, 20);

            this.txtInputReportBufferSize.TabIndex = 0;

            //

            // fraDeviceIdentifiers

            //

            this.fraDeviceIdentifiers.Controls.Add(this.txtProductID);

            this.fraDeviceIdentifiers.Controls.Add(this.lblProductID);

            this.fraDeviceIdentifiers.Controls.Add(this.txtVendorID);

            this.fraDeviceIdentifiers.Controls.Add(this.lblVendorID);

            this.fraDeviceIdentifiers.Location = new System.Drawing.Point(409, 12);

            this.fraDeviceIdentifiers.Name = "fraDeviceIdentifiers";

            this.fraDeviceIdentifiers.Size = new System.Drawing.Size(208, 96);

            this.fraDeviceIdentifiers.TabIndex = 10;

            this.fraDeviceIdentifiers.TabStop = false;

            this.fraDeviceIdentifiers.Text = "Device Identifiers";

            //

            // txtProductID

            //

            this.txtProductID.Location = new System.Drawing.Point(120, 56);

            this.txtProductID.Name = "txtProductID";

            this.txtProductID.Size = new System.Drawing.Size(72, 20);

            this.txtProductID.TabIndex = 3;

            this.txtProductID.Text = "1299";

            this.txtProductID.TextChanged += new System.EventHandler(this.txtProductID_TextChanged);

            //

            // lblProductID

            //

            this.lblProductID.Location = new System.Drawing.Point(16, 56);

            this.lblProductID.Name = "lblProductID";

            this.lblProductID.Size = new System.Drawing.Size(112, 23);

            this.lblProductID.TabIndex = 2;

            this.lblProductID.Text = "Product ID (hex):";

            //

            // txtVendorID

            //

            this.txtVendorID.Location = new System.Drawing.Point(120, 24);

            this.txtVendorID.Name = "txtVendorID";

            this.txtVendorID.Size = new System.Drawing.Size(72, 20);

            this.txtVendorID.TabIndex = 1;

            this.txtVendorID.Text = "0925";

            this.txtVendorID.TextChanged += new System.EventHandler(this.txtVendorID_TextChanged);

            //

            // lblVendorID

            //

            this.lblVendorID.Location = new System.Drawing.Point(16, 24);

            this.lblVendorID.Name = "lblVendorID";

            this.lblVendorID.Size = new System.Drawing.Size(112, 23);

            this.lblVendorID.TabIndex = 0;

            this.lblVendorID.Text = "Vendor ID (hex):";

            //

            // cmdFindDevice

            //

            this.cmdFindDevice.Location = new System.Drawing.Point(636, 12);

            this.cmdFindDevice.Name = "cmdFindDevice";

            this.cmdFindDevice.Size = new System.Drawing.Size(136, 26);

            this.cmdFindDevice.TabIndex = 11;

            this.cmdFindDevice.Text = "Find My Device";

            this.cmdFindDevice.Click += new System.EventHandler(this.cmdFindDevice_Click);

            //

            // cmdSendOutputReportInterrupt

            //

            this.cmdSendOutputReportInterrupt.Location = new System.Drawing.Point(21, 27);

            this.cmdSendOutputReportInterrupt.Name = "cmdSendOutputReportInterrupt";

            this.cmdSendOutputReportInterrupt.Size = new System.Drawing.Size(118, 26);

            this.cmdSendOutputReportInterrupt.TabIndex = 12;

            this.cmdSendOutputReportInterrupt.Text = "Send Output Report";

            this.cmdSendOutputReportInterrupt.UseVisualStyleBackColor = true;

            this.cmdSendOutputReportInterrupt.Click += new System.EventHandler(this.cmdSendOutputReportInterrupt_Click);

            //

            // cmdGetInputReportInterrupt

            //

            this.cmdGetInputReportInterrupt.Location = new System.Drawing.Point(21, 60);

            this.cmdGetInputReportInterrupt.Name = "cmdGetInputReportInterrupt";

            this.cmdGetInputReportInterrupt.Size = new System.Drawing.Size(118, 26);

            this.cmdGetInputReportInterrupt.TabIndex = 13;

            this.cmdGetInputReportInterrupt.Text = "Get Input Report";

            this.cmdGetInputReportInterrupt.UseVisualStyleBackColor = true;

            this.cmdGetInputReportInterrupt.Click += new System.EventHandler(this.cmdGetInputReportInterrupt_Click);

            //

            // fraInterruptTransfers

            //

            this.fraInterruptTransfers.BackColor = System.Drawing.SystemColors.Control;

            this.fraInterruptTransfers.Controls.Add(this.cmdSendOutputReportInterrupt);

            this.fraInterruptTransfers.Controls.Add(this.cmdGetInputReportInterrupt);

            this.fraInterruptTransfers.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.fraInterruptTransfers.ForeColor = System.Drawing.SystemColors.ControlText;

            this.fraInterruptTransfers.Location = new System.Drawing.Point(338, 129);

            this.fraInterruptTransfers.Name = "fraInterruptTransfers";

            this.fraInterruptTransfers.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.fraInterruptTransfers.Size = new System.Drawing.Size(151, 100);

            this.fraInterruptTransfers.TabIndex = 14;

            this.fraInterruptTransfers.TabStop = false;

            this.fraInterruptTransfers.Text = "Interrupt Transfers";

            //

            // cmdPeriodicTransfers

            //

            this.cmdPeriodicTransfers.Location = new System.Drawing.Point(153, 36);

            this.cmdPeriodicTransfers.Name = "cmdPeriodicTransfers";

            this.cmdPeriodicTransfers.Size = new System.Drawing.Size(118, 26);

            this.cmdPeriodicTransfers.TabIndex = 16;

            this.cmdPeriodicTransfers.Text = "Start";

            this.cmdPeriodicTransfers.UseVisualStyleBackColor = true;

            this.cmdPeriodicTransfers.Click += new System.EventHandler(this.cmdPeriodicTransfers_Click);

            //

            // cmdSendOutputReportControl

            //

            this.cmdSendOutputReportControl.Location = new System.Drawing.Point(10, 27);

            this.cmdSendOutputReportControl.Name = "cmdSendOutputReportControl";

            this.cmdSendOutputReportControl.Size = new System.Drawing.Size(118, 26);

            this.cmdSendOutputReportControl.TabIndex = 12;

            this.cmdSendOutputReportControl.Text = "Send Output Report";

            this.cmdSendOutputReportControl.UseVisualStyleBackColor = true;

            this.cmdSendOutputReportControl.Click += new System.EventHandler(this.cmdSendOutputReportControl_Click);

            //

            // cmdGetInputReportControl

            //

            this.cmdGetInputReportControl.Location = new System.Drawing.Point(10, 60);

            this.cmdGetInputReportControl.Name = "cmdGetInputReportControl";

            this.cmdGetInputReportControl.Size = new System.Drawing.Size(118, 26);

            this.cmdGetInputReportControl.TabIndex = 13;

            this.cmdGetInputReportControl.Text = "Get Input Report";

            this.cmdGetInputReportControl.UseVisualStyleBackColor = true;

            this.cmdGetInputReportControl.Click += new System.EventHandler(this.cmdGetInputReportControl_Click);

            //

            // fraControlTransfers

            //

            this.fraControlTransfers.BackColor = System.Drawing.SystemColors.Control;

            this.fraControlTransfers.Controls.Add(this.cmdGetFeatureReport);

            this.fraControlTransfers.Controls.Add(this.cmdSendFeatureReport);

            this.fraControlTransfers.Controls.Add(this.cmdSendOutputReportControl);

            this.fraControlTransfers.Controls.Add(this.cmdGetInputReportControl);

            this.fraControlTransfers.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.fraControlTransfers.ForeColor = System.Drawing.SystemColors.ControlText;

            this.fraControlTransfers.Location = new System.Drawing.Point(495, 129);

            this.fraControlTransfers.Name = "fraControlTransfers";

            this.fraControlTransfers.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.fraControlTransfers.Size = new System.Drawing.Size(277, 100);

            this.fraControlTransfers.TabIndex = 15;

            this.fraControlTransfers.TabStop = false;

            this.fraControlTransfers.Text = "Control Transfers";

            //

            // cmdGetFeatureReport

            //

            this.cmdGetFeatureReport.Location = new System.Drawing.Point(141, 60);

            this.cmdGetFeatureReport.Name = "cmdGetFeatureReport";

            this.cmdGetFeatureReport.Size = new System.Drawing.Size(118, 26);

            this.cmdGetFeatureReport.TabIndex = 15;

            this.cmdGetFeatureReport.Text = "Get Feature Report";

            this.cmdGetFeatureReport.UseVisualStyleBackColor = true;

            this.cmdGetFeatureReport.Click += new System.EventHandler(this.cmdGetFeatureReport_Click);

            //

            // cmdSendFeatureReport

            //

            this.cmdSendFeatureReport.Location = new System.Drawing.Point(141, 27);

            this.cmdSendFeatureReport.Name = "cmdSendFeatureReport";

            this.cmdSendFeatureReport.Size = new System.Drawing.Size(118, 26);

            this.cmdSendFeatureReport.TabIndex = 14;

            this.cmdSendFeatureReport.Text = "Send Feature Report";

            this.cmdSendFeatureReport.UseVisualStyleBackColor = true;

            this.cmdSendFeatureReport.Click += new System.EventHandler(this.cmdSendFeatureReport_Click);

            //

            // fraSendAndGetContinuous

            //

            this.fraSendAndGetContinuous.BackColor = System.Drawing.SystemColors.Control;

            this.fraSendAndGetContinuous.Controls.Add(this.radFeature);

            this.fraSendAndGetContinuous.Controls.Add(this.radInputOutputControl);

            this.fraSendAndGetContinuous.Controls.Add(this.radInputOutputInterrupt);

            this.fraSendAndGetContinuous.Controls.Add(this.cmdPeriodicTransfers);

            this.fraSendAndGetContinuous.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.fraSendAndGetContinuous.ForeColor = System.Drawing.SystemColors.ControlText;

            this.fraSendAndGetContinuous.Location = new System.Drawing.Point(311, 235);

            this.fraSendAndGetContinuous.Name = "fraSendAndGetContinuous";

            this.fraSendAndGetContinuous.RightToLeft = System.Windows.Forms.RightToLeft.No;

            this.fraSendAndGetContinuous.Size = new System.Drawing.Size(295, 112);

            this.fraSendAndGetContinuous.TabIndex = 17;

            this.fraSendAndGetContinuous.TabStop = false;

            this.fraSendAndGetContinuous.Text = "Send and Get Continuous";

            //

            // radFeature

            //

            this.radFeature.AutoSize = true;

            this.radFeature.Location = new System.Drawing.Point(17, 76);

            this.radFeature.Name = "radFeature";

            this.radFeature.Size = new System.Drawing.Size(62, 18);

            this.radFeature.TabIndex = 19;

            this.radFeature.TabStop = true;

            this.radFeature.Text = "Feature";

            this.radFeature.UseVisualStyleBackColor = true;

            this.radFeature.CheckedChanged += new System.EventHandler(this.radFeature_CheckedChanged);

            //

            // radInputOutputControl

            //

            this.radInputOutputControl.AutoSize = true;

            this.radInputOutputControl.Location = new System.Drawing.Point(17, 52);

            this.radInputOutputControl.Name = "radInputOutputControl";

            this.radInputOutputControl.Size = new System.Drawing.Size(120, 18);

            this.radInputOutputControl.TabIndex = 18;

            this.radInputOutputControl.TabStop = true;

            this.radInputOutputControl.Text = "Input Output Control";

            this.radInputOutputControl.UseVisualStyleBackColor = true;

            this.radInputOutputControl.CheckedChanged += new System.EventHandler(this.radInputOutputControl_CheckedChanged);

            //

            // radInputOutputInterrupt

            //

            this.radInputOutputInterrupt.AutoSize = true;

            this.radInputOutputInterrupt.Location = new System.Drawing.Point(17, 28);

            this.radInputOutputInterrupt.Name = "radInputOutputInterrupt";

            this.radInputOutputInterrupt.Size = new System.Drawing.Size(126, 18);

            this.radInputOutputInterrupt.TabIndex = 17;

            this.radInputOutputInterrupt.TabStop = true;

            this.radInputOutputInterrupt.Text = "Input Output Interrupt";

            this.radInputOutputInterrupt.UseVisualStyleBackColor = true;

            this.radInputOutputInterrupt.CheckedChanged += new System.EventHandler(this.radInputOutputInterrupt_CheckedChanged);

            //

            // treeViewDevices

            //

            this.treeViewDevices.Location = new System.Drawing.Point(12, 12);

            this.treeViewDevices.Name = "treeViewDevices";

            this.treeViewDevices.Size = new System.Drawing.Size(284, 461);

            this.treeViewDevices.TabIndex = 18;

            this.treeViewDevices.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeViewDevices_AfterSelect);

            //

            // FrmMain

            //

            this.ClientSize = new System.Drawing.Size(784, 756);

            this.Controls.Add(this.treeViewDevices);

            this.Controls.Add(this.fraSendAndGetContinuous);

            this.Controls.Add(this.fraControlTransfers);

            this.Controls.Add(this.fraInterruptTransfers);

            this.Controls.Add(this.cmdFindDevice);

            this.Controls.Add(this.fraDeviceIdentifiers);

            this.Controls.Add(this.fraInputReportBufferSize);

            this.Controls.Add(this.FraBytesReceived);

            this.Controls.Add(this.FraBytesToSend);

            this.Controls.Add(this.LstResults);

            this.Font = new System.Drawing.Font("Arial", 8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

            this.Location = new System.Drawing.Point(21, 28);

            this.Name = "FrmMain";

            this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;

            this.Text = "Generic HID Tester";

            this.Closed += new System.EventHandler(this.frmMain_Closed);

            this.Load += new System.EventHandler(this.frmMain_Load);

            this.FraBytesReceived.ResumeLayout(false);

            this.FraBytesReceived.PerformLayout();

            this.FraBytesToSend.ResumeLayout(false);

            this.fraInputReportBufferSize.ResumeLayout(false);

            this.fraInputReportBufferSize.PerformLayout();

            this.fraDeviceIdentifiers.ResumeLayout(false);

            this.fraDeviceIdentifiers.PerformLayout();

            this.fraInterruptTransfers.ResumeLayout(false);

            this.fraControlTransfers.ResumeLayout(false);

            this.fraSendAndGetContinuous.ResumeLayout(false);

            this.fraSendAndGetContinuous.PerformLayout();

            this.ResumeLayout(false);

		}

		#endregion '"Windows Form Designer generated code "'

		private Boolean _deviceDetected;

		private IntPtr _deviceNotificationHandle;

		private FileStream _deviceData;

		private FormActions _formActions;

		private SafeFileHandle _hidHandle;

		private String _hidUsage;

		private ManagementEventWatcher _deviceArrivedWatcher;

		private Boolean _deviceHandleObtained;

		private ManagementEventWatcher _deviceRemovedWatcher;

		private Int32 _myProductId;

		private Int32 _myVendorId;

		private Boolean _periodicTransfersRequested;

		private ReportReadOrWritten _readOrWritten;

		private ReportTypes _reportType;

		private SendOrGet _sendOrGet;

		private Boolean _transferInProgress;

		private TransferTypes _transferType;

		private static System.Timers.Timer _periodicTransfers;

		private readonly Debugging _myDebugging = new Debugging(); //  For viewing results of API calls via Debug.Write.

		private readonly DeviceManagement _myDeviceManagement = new DeviceManagement();

		private Hid _myHid = new Hid();

		private enum FormActions

		{

			AddItemToListBox,

			DisableInputReportBufferSize,

			EnableGetInputReportInterruptTransfer,

			EnableInputReportBufferSize,

			EnableSendOutputReportInterrupt,

			ScrollToBottomOfListBox,

			SetInputReportBufferSize,

            AddDeviceToTreeView,

            ResetDeviceTreeView,

            SelectDeviceInTreeView,

            CompleteDeviceTreeView

		}

		private enum ReportReadOrWritten

		{

			Read,

			Written

		}

		private enum ReportTypes

		{

			Input,

			Output,

			Feature

		}

		private enum SendOrGet

		{

			Send,

			Get

		}

		private enum TransferTypes

		{

			Control,

			Interrupt

		}

		private enum WmiDeviceProperties

		{

			Name,

			Caption,

			Description,

			Manufacturer,

			PNPDeviceID,

			DeviceID,

			ClassGUID

		}

		internal FrmMain FrmMy;

		//  This delegate has the same parameters as AccessForm.

		//  Used in accessing the application's form from a different thread.

        private delegate void MarshalDataToForm(FormActions action, params string[] strings);

		///  <summary>

		///  Performs various application-specific functions that

		///  involve accessing the application's form.

		///  </summary>

		///

		///  <param name="action"> a FormActions member that names the action to perform on the form</param>

		///  <param name="formText"> text that the form displays or the code uses for

		///  another purpose. Actions that don't use text ignore this parameter. </param>

		private void AccessForm(FormActions action, params string[] strings)

		{

			try

			{

				//  Select an action to perform on the form:

				switch (action)

				{

					case FormActions.AddItemToListBox:

                        LstResults.Items.Add(strings[0]);

						break;

					case FormActions.DisableInputReportBufferSize:

						cmdInputReportBufferSize.Enabled = false;

						break;

					case FormActions.EnableGetInputReportInterruptTransfer:

						cmdGetInputReportInterrupt.Enabled = true;

						break;

					case FormActions.EnableInputReportBufferSize:

						cmdInputReportBufferSize.Enabled = true;

						break;

					case FormActions.EnableSendOutputReportInterrupt:

						cmdSendOutputReportInterrupt.Enabled = true;

						break;

					case FormActions.ScrollToBottomOfListBox:

						LstResults.SelectedIndex = LstResults.Items.Count - 1;

						break;

					case FormActions.SetInputReportBufferSize:

                        txtInputReportBufferSize.Text = strings[0];

						break;

                    case FormActions.AddDeviceToTreeView:

                        {

                            //Try and see if our device is already present

                            TreeNode[] res = treeViewDevices.Nodes.Find(strings[0], false);

                            foreach (TreeNode device in res)

                            {

                                if (device.ForeColor == Color.Red)

                                {

                                    //Device was removed and has now been added back

                                    device.ForeColor = Color.Green;

                                }

                                else

                                {

                                    //Device was already there set back our device color to black

                                    device.ForeColor = Color.Black;

                                }

                            }

                            if (res.Length > 0)

                            {

                                //Our device is already there

                                break;

                            }

                            //Build our node from our string array

                            TreeNode newNode = new TreeNode(strings[0]);

                            for (int i = 1; i < strings.Length; i++)

                            {

                                newNode.Nodes.Add(strings[i]);

                                if (strings[i].StartsWith("Name: "))

                                {

                                    //Found our name property, update our node text

                                    newNode.Text = strings[i].Substring(6, strings[i].Length - 6);

                                }

                            }

                            //New device color is green

                            newNode.ForeColor = Color.Green;

                            newNode.Name = strings[0]; //Set ID as name to make sure we can find it

                            treeViewDevices.Nodes.Add(newNode);

                        }

                        break;

                    case FormActions.ResetDeviceTreeView:

                        {

                            //Mark all non removed/red device as purple/unknown

                            foreach (TreeNode device in treeViewDevices.Nodes)

                            {

                                if (device.ForeColor != Color.Red)

                                {

                                    device.ForeColor = Color.Purple;

                                }

                            }

                            //treeViewDevices.Nodes.Clear();

                        }

                        break;

                    case FormActions.CompleteDeviceTreeView:

                        {

                            //Our device list is now complete

                            foreach (TreeNode device in treeViewDevices.Nodes)

                            {

                                //Purple devices need to be marked as red for removed

                                if (device.ForeColor == Color.Purple)

                                {

                                    device.ForeColor = Color.Red;

                                }

                            }

                        }

                        break;

                    case FormActions.SelectDeviceInTreeView:

                        {

                            //treeViewDevices.SelectedNode = null;

                            TreeNode[] res = treeViewDevices.Nodes.Find(strings[0], false);

                            foreach (TreeNode device in res)

                            {

                                device.ForeColor = Color.Blue;

                                //treeViewDevices.SelectedNode = res[0];

                                //treeViewDevices.SelectedNode.ForeColor = Color.Blue;

                            }

                        }

                        break;

				}

			}

			catch (Exception ex)

			{

				DisplayException(Name, ex);

				throw;

			}

		}

		///  <summary>

		///  Add a handler to detect arrival of devices using WMI.

		///  </summary>

		private void AddDeviceArrivedHandler()

		{

			const Int32 pollingIntervalSeconds = 3;

			var scope = new ManagementScope("root\\CIMV2");

			scope.Options.EnablePrivileges = true;

			try

			{

				var q = new WqlEventQuery();

				q.EventClassName = "__InstanceCreationEvent";

				q.WithinInterval = new TimeSpan(0, 0, pollingIntervalSeconds);

				q.Condition = @"TargetInstance ISA 'Win32_USBControllerdevice'";

				_deviceArrivedWatcher = new ManagementEventWatcher(scope, q);

				_deviceArrivedWatcher.EventArrived += DeviceAdded;

				_deviceArrivedWatcher.Start();

			}

			catch (Exception e)

			{

				Debug.WriteLine(e.Message);

				if (_deviceArrivedWatcher != null)

					_deviceArrivedWatcher.Stop();

			}

		}

		///  <summary>

		///  Add a handler to detect removal of devices using WMI.

		///  </summary>

		private void AddDeviceRemovedHandler()

		{

			const Int32 pollingIntervalSeconds = 3;

			var scope = new ManagementScope("root\\CIMV2");

			scope.Options.EnablePrivileges = true;

			try

			{

				var q = new WqlEventQuery();

				q.EventClassName = "__InstanceDeletionEvent";

				q.WithinInterval = new TimeSpan(0, 0, pollingIntervalSeconds);

				q.Condition = @"TargetInstance ISA 'Win32_USBControllerdevice'";

				_deviceRemovedWatcher = new ManagementEventWatcher(scope, q);

				_deviceRemovedWatcher.EventArrived += DeviceRemoved;

				_deviceRemovedWatcher.Start();

			}

			catch (Exception e)

			{

				Debug.WriteLine(e.Message);

				if (_deviceRemovedWatcher != null)

					_deviceRemovedWatcher.Stop();

			}

		}

		/// <summary>

		/// Close the handle and FileStreams for a device.

		/// </summary>

		///

		private void CloseCommunications()

		{

			if (_deviceData != null)

			{

				_deviceData.Close();

			}

			if ((_hidHandle != null) && (!(_hidHandle.IsInvalid)))

			{

				_hidHandle.Close();

			}

			// The next attempt to communicate will get a new handle and FileStreams.

			_deviceHandleObtained = false;

		}

		///  <summary>

		///  Search for a specific device.

		///  </summary>

		private void cmdFindDevice_Click(Object sender, EventArgs e)

		{

			try

			{

				if (_transferInProgress)

				{

					DisplayTransferInProgressMessage();

				}

				else

				{

					_deviceDetected = FindDeviceUsingWmi();

					if (_deviceDetected)

					{

						FindTheHid();

					}

				}

			}

			catch (Exception ex)

			{

				DisplayException(Name, ex);

				throw;

			}

		}

		/// <summary>

		/// Request to get a Feature report from the device.

		/// </summary>

		/// <param name="sender"></param>

		/// <param name="e"></param>

		private void cmdGetFeatureReport_Click(object sender, EventArgs e)

		{

			try

			{

				if (_transferInProgress)

				{

					DisplayTransferInProgressMessage();

				}

				else

				{

					//  Don't allow another transfer request until this one completes.

					//  Move the focus away from the button to prevent the focus from

					//  switching to the next control in the tab order on disabling the button.

					fraControlTransfers.Focus();