@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The GetRawInputDeviceList function enumerates the raw input devices attached to the system. !!!!C# Signature: public enum RawInputDeviceType : uint { MOUSE = 0, KEYBOARD = 1, HID = 2 } [StructLayout( LayoutKind.Sequential )] public struct RAWINPUTDEVICELIST { public IntPtr hDevice; public RawInputDeviceType Type; } [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] public static extern uint GetRawInputDeviceList ( [In, Out] RAWINPUTDEVICELIST[] RawInputDeviceList, ref uint NumDevices, uint Size /* = (uint)Marshal.SizeOf(typeof(RawInputDeviceList)) */ ); !!!!VB.Net Signature: < StructLayout( LayoutKind.Sequential )> _ Public Structure RAWINPUTDEVICELIST Public hDevice as Int32 Public dwType as UInt32 End Structure <DllImport("user32.dll", CharSet:=CharSet.Auto, EntryPOint:="GetRawInputDeviceList", SetLastError:=True)> _ Public Function GetRawInputDeviceList(ByVal pRawInputDeviceList As IntPtr, ByRef puiNumDevices As Int32, ByVal cbSize As Int32) As Int32 End Function !!!!VB Signature: Declare Function GetRawInputDeviceList Lib "user32.dll" (ByVal pRawInputDeviceList As IntPtr, ByRef puiNumDevices As Long, ByVal cbSize As Long) As Long !!!!User-Defined Types: None. !!!!Alternative Managed API: !!!!Notes: None. !!!!Tips & Tricks: !!!!Sample Code: int structSize = Marshal.SizeOf(typeof(RAWINPUTDEVICELIST)); int bufferCount = 10; IntPtr buffer = Marshal.AllocHGlobal(bufferCount * structSize); int deviceCount = GetRawInputDeviceList(buffer, ref bufferCount, structSize); for (int i = 0; i < deviceCount; ++i) { RAWINPUTDEVICELIST device = (RAWINPUTDEVICELIST)Marshal.PtrToStructure( new IntPtr((buffer.ToInt32() + (structSize * i))),typeof(RAWINPUTDEVICELIST)); ... } // A convenient function for getting all raw input devices. // This method will get all devices, including virtual devices // For remote desktop and any other device driver that's registered // as such a device. public static RAWINPUTDEVICELIST[] GetAllRawDevices() { uint deviceCount = 0; uint dwSize = (uint)Marshal.SizeOf(typeof(RAWINPUTDEVICELIST)); // First call the system routine with a null pointer // for the array to get the size needed for the list uint retValue = Win32API.GetRawInputDeviceList(null, ref deviceCount, dwSize); // If anything but zero is returned, the call failed, so return a null list if (0 != retValue) return null; // Now allocate an array of the specified number of entries RAWINPUTDEVICELIST[] deviceList = new RAWINPUTDEVICELIST[deviceCount]; // Now make the call again, using the array retValue = Win32API.GetRawInputDeviceList(deviceList, ref deviceCount, dwSize); // Free up the memory we first got the information into as // it is no longer needed, since the structures have been // copied to the deviceList array. //IntPtr pRawInputDeviceList = Marshal.AllocHGlobal((int)(dwSize * deviceCount)); //Marshal.FreeHGlobal(pRawInputDeviceList); // Finally, return the filled in list return deviceList; } Documentation: GetRawInputDeviceList@msdn on MSDN
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