/// <summary>
/// Identifies the handler for a device.
/// </summary>
/// <param name="lParam">The handle to a raw input dataset.</param>
/// <param name="rih">Returns the <see cref="RAWINPUTHEADER"/> of the raw input dataset.</param>
/// <returns>The id of the handler.</returns>
public T GetHandlerFromWmInput(IntPtr lParam, out RAWINPUTHEADER rih)
{
rih = RawInput.GetRawInputDataHeader(lParam);
T ret;
if (!front.TryGetValue(rih.hDevice, out ret))
{
return(default(T));
}
return(ret);
}
/// <summary>
/// Retrieves the raw input header from the specified device.
/// </summary>
/// <remarks>See <see cref="GetRawInputData"/> for more information.</remarks>
/// <param name="hRawInput">A handle to the <see cref="RAWINPUT"/> structure. This comes from the
/// <b>lParam</b> in <see cref="WM.INPUT">WM_INPUT</see>.</param>
/// <returns>The raw input header as <see cref="RAWINPUTHEADER"/>.</returns>
public static RAWINPUTHEADER GetRawInputDataHeader(HRAWINPUT hRawInput)
{
uint size = RAWINPUTHEADER.SIZE;
RAWINPUTHEADER ret = new RAWINPUTHEADER();
ret.dwSize = size;
uint err = GetRawInputDataH(hRawInput, RID.HEADER, ref ret, ref size, RAWINPUTHEADER.SIZE);
if (err == uint.MaxValue)
{
throw new Exception(string.Format("Error getting header of WM_INPUT data. (Error code: 0x{0:X8})", WinKernel.GetLastError()));
}
return(ret);
}
extern static uint GetRawInputDataH(HRAWINPUT hRawInput, RID uiCommand, ref RAWINPUTHEADER pData, ref uint pcbSize, uint cbSizeHeader);