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using System;
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using System.Runtime.InteropServices;
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using System.Diagnostics;
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namespace Win32
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{
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static class RawInput
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{
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/// <summary>
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///
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/// </summary>
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/// <param name="aRawInputHandle"></param>
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/// <param name="aRawInput"></param>
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/// <param name="rawInputBuffer">Caller must free up memory on the pointer using Marshal.FreeHGlobal</param>
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/// <returns></returns>
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public static bool GetRawInputData(IntPtr aRawInputHandle, ref RAWINPUT aRawInput, ref IntPtr rawInputBuffer)
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{
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bool success = true;
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rawInputBuffer = IntPtr.Zero;
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try
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{
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uint dwSize = 0;
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uint sizeOfHeader = (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER));
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//Get the size of our raw input data.
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Win32.Function.GetRawInputData(aRawInputHandle, Const.RID_INPUT, IntPtr.Zero, ref dwSize, sizeOfHeader);
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//Allocate a large enough buffer
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rawInputBuffer = Marshal.AllocHGlobal((int)dwSize);
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//Now read our RAWINPUT data
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if (Win32.Function.GetRawInputData(aRawInputHandle, Const.RID_INPUT, rawInputBuffer, ref dwSize, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER))) != dwSize)
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{
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return false;
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}
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//Cast our buffer
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aRawInput = (RAWINPUT)Marshal.PtrToStructure(rawInputBuffer, typeof(RAWINPUT));
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}
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catch
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{
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Debug.WriteLine("GetRawInputData failed!");
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success = false;
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}
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return success;
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="aRawInputHandle"></param>
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/// <param name="aUsagePage"></param>
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/// <param name="aUsage"></param>
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/// <returns></returns>
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public static bool GetDeviceInfo(IntPtr hDevice, ref RID_DEVICE_INFO deviceInfo)
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{
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bool success = true;
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IntPtr deviceInfoBuffer = IntPtr.Zero;
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try
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{
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//Get Device Info
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uint deviceInfoSize = (uint)Marshal.SizeOf(typeof(RID_DEVICE_INFO));
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deviceInfoBuffer = Marshal.AllocHGlobal((int)deviceInfoSize);
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int res = Win32.Function.GetRawInputDeviceInfo(hDevice, Const.RIDI_DEVICEINFO, deviceInfoBuffer, ref deviceInfoSize);
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if (res <= 0)
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{
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Debug.WriteLine("WM_INPUT could not read device info: " + Marshal.GetLastWin32Error().ToString());
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return false;
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}
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//Cast our buffer
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deviceInfo = (RID_DEVICE_INFO)Marshal.PtrToStructure(deviceInfoBuffer, typeof(RID_DEVICE_INFO));
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}
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catch
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{
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Debug.WriteLine("GetRawInputData failed!");
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success = false;
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}
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finally
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{
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//Always executes, prevents memory leak
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Marshal.FreeHGlobal(deviceInfoBuffer);
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}
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return success;
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}
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}
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} |