sl@10: using System;
sl@10: using System.Runtime.InteropServices;
sl@10: using System.Diagnostics;
sl@10: 
sl@10: 
sl@10: namespace Win32
sl@10: {
sl@17:     /// <summary>
sl@17:     /// Provide some utility functions for raw input handling.
sl@17:     /// </summary>
sl@10:     static class RawInput
sl@10:     {
sl@10:         /// <summary>
sl@10:         /// 
sl@10:         /// </summary>
sl@10:         /// <param name="aRawInputHandle"></param>
sl@10:         /// <param name="aRawInput"></param>
sl@10:         /// <param name="rawInputBuffer">Caller must free up memory on the pointer using Marshal.FreeHGlobal</param>
sl@10:         /// <returns></returns>
sl@10:         public static bool GetRawInputData(IntPtr aRawInputHandle, ref RAWINPUT aRawInput, ref IntPtr rawInputBuffer)
sl@10:         {
sl@10:             bool success = true;
sl@10:             rawInputBuffer = IntPtr.Zero;
sl@10: 
sl@10:             try
sl@10:             {
sl@10:                 uint dwSize = 0;
sl@10:                 uint sizeOfHeader = (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER));
sl@10: 
sl@10:                 //Get the size of our raw input data.
sl@10:                 Win32.Function.GetRawInputData(aRawInputHandle, Const.RID_INPUT, IntPtr.Zero, ref dwSize, sizeOfHeader);
sl@10: 
sl@10:                 //Allocate a large enough buffer
sl@10:                  rawInputBuffer = Marshal.AllocHGlobal((int)dwSize);
sl@10: 
sl@10:                 //Now read our RAWINPUT data
sl@10:                 if (Win32.Function.GetRawInputData(aRawInputHandle, Const.RID_INPUT, rawInputBuffer, ref dwSize, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER))) != dwSize)
sl@10:                 {
sl@10:                     return false;
sl@10:                 }
sl@10: 
sl@10:                 //Cast our buffer
sl@10:                 aRawInput = (RAWINPUT)Marshal.PtrToStructure(rawInputBuffer, typeof(RAWINPUT));
sl@10:             }
sl@10:             catch
sl@10:             {
sl@10:                 Debug.WriteLine("GetRawInputData failed!");
sl@10:                 success = false;
sl@10:             }
sl@10: 
sl@10:             return success;
sl@10:         }
sl@10: 
sl@10:         /// <summary>
sl@10:         /// 
sl@10:         /// </summary>
sl@10:         /// <param name="aRawInputHandle"></param>
sl@10:         /// <param name="aUsagePage"></param>
sl@10:         /// <param name="aUsage"></param>
sl@10:         /// <returns></returns>
sl@10:         public static bool GetDeviceInfo(IntPtr hDevice, ref RID_DEVICE_INFO deviceInfo)
sl@10:         {
sl@10:             bool success = true;
sl@10:             IntPtr deviceInfoBuffer = IntPtr.Zero;
sl@10:             try
sl@10:             {
sl@10:                 //Get Device Info
sl@10:                 uint deviceInfoSize = (uint)Marshal.SizeOf(typeof(RID_DEVICE_INFO));
sl@10:                 deviceInfoBuffer = Marshal.AllocHGlobal((int)deviceInfoSize);
sl@10: 
sl@23:                 int res = Win32.Function.GetRawInputDeviceInfo(hDevice, Const.RIDI_DEVICEINFO, deviceInfoBuffer, ref deviceInfoSize);
sl@10:                 if (res <= 0)
sl@10:                 {
sl@10:                     Debug.WriteLine("WM_INPUT could not read device info: " + Marshal.GetLastWin32Error().ToString());
sl@10:                     return false;
sl@10:                 }
sl@10: 
sl@10:                 //Cast our buffer
sl@10:                 deviceInfo = (RID_DEVICE_INFO)Marshal.PtrToStructure(deviceInfoBuffer, typeof(RID_DEVICE_INFO));
sl@10:             }
sl@10:             catch
sl@10:             {
sl@10:                 Debug.WriteLine("GetRawInputData failed!");
sl@10:                 success = false;
sl@10:             }
sl@10:             finally
sl@10:             {
sl@10:                 //Always executes, prevents memory leak
sl@10:                 Marshal.FreeHGlobal(deviceInfoBuffer);
sl@10:             }
sl@10: 
sl@10:             
sl@10:             return success;
sl@10:         }
sl@10: 
sl@17:         /// <summary>
sl@19:         /// Fetch pre-parsed data corresponding to HID descriptor for the given HID device.
sl@17:         /// </summary>
sl@17:         /// <param name="device"></param>
sl@17:         /// <returns></returns>
sl@17:         public static IntPtr GetPreParsedData(IntPtr hDevice)
sl@17:         {
sl@17:             uint ppDataSize = 256;
sl@23:             int result = Win32.Function.GetRawInputDeviceInfo(hDevice, Win32.Const.RIDI_PREPARSEDDATA, IntPtr.Zero, ref ppDataSize);
sl@17:             if (result != 0)
sl@17:             {
sl@17:                 Debug.WriteLine("Failed to get raw input pre-parsed data size" + result + Marshal.GetLastWin32Error());
sl@17:                 return IntPtr.Zero;
sl@17:             }
sl@17: 
sl@17:             IntPtr ppData = Marshal.AllocHGlobal((int)ppDataSize);
sl@23:             result = Win32.Function.GetRawInputDeviceInfo(hDevice, Win32.Const.RIDI_PREPARSEDDATA, ppData, ref ppDataSize);
sl@17:             if (result <= 0)
sl@17:             {
sl@17:                 Debug.WriteLine("Failed to get raw input pre-parsed data" + result + Marshal.GetLastWin32Error());
sl@17:                 return IntPtr.Zero;
sl@17:             }
sl@17:             return ppData;
sl@17:         }
sl@17: 
sl@22:         /// <summary>
sl@22:         /// 
sl@22:         /// </summary>
sl@22:         /// <param name="device"></param>
sl@22:         /// <returns></returns>
sl@22:         public static string GetDeviceName(IntPtr device)
sl@22:         {
sl@22:             uint deviceNameSize = 256;
sl@23:             int result = Win32.Function.GetRawInputDeviceInfo(device, Win32.Const.RIDI_DEVICENAME, IntPtr.Zero, ref deviceNameSize);
sl@22:             if (result != 0)
sl@22:             {
sl@22:                 return string.Empty;
sl@22:             }
sl@22: 
sl@22:             IntPtr deviceName = Marshal.AllocHGlobal((int)deviceNameSize * 2);  // size is the character count not byte count
sl@22:             try
sl@22:             {
sl@23:                 result = Win32.Function.GetRawInputDeviceInfo(device, Win32.Const.RIDI_DEVICENAME, deviceName, ref deviceNameSize);
sl@22:                 if (result > 0)
sl@22:                 {
sl@23:                     return Marshal.PtrToStringAnsi(deviceName, result - 1); // -1 for NULL termination
sl@22:                 }
sl@22: 
sl@22:                 return string.Empty;
sl@22:             }
sl@22:             finally
sl@22:             {
sl@22:                 Marshal.FreeHGlobal(deviceName);
sl@22:             }
sl@22:         }
sl@22: 
sl@17: 
sl@10:     }
sl@10: }