public static RawInput FromBytes(byte[] bytes, int offset, out int nextByteOffset)
{
RawInput ri;
int headerOffset;
int dataOffset;
var header = RawInputHeader.FromBytes(bytes, offset + 0, out headerOffset);
if ((int)bytes[offset] == (int)RawInputDeviceType.Mouse)
{
ri = new RawInput()
{
Header = header,
Data = new RawInputData()
{
Mouse = RawMouse.FromBytes(bytes, headerOffset, out dataOffset),
},
};
}
else if ((int)bytes[offset] == (int)RawInputDeviceType.Keyboard)
{
ri = new RawInput()
{
Header = header,
Data = new RawInputData()
{
Keyboard = RawKeyboard.FromBytes(bytes, headerOffset, out dataOffset),
},
};
}
else if ((int)bytes[offset] == (int)RawInputDeviceType.Hid)
{
ri = new RawInput()
{
Header = header,
Data = new RawInputData()
{
Hid = RawHid.FromBytes(bytes, headerOffset, out dataOffset),
},
};
}
else
{
throw new NotSupportedException();
}
nextByteOffset = dataOffset;
return(ri);
}
/// <summary>
/// Calls User32.GetRawInputData. Accepts lParam from WndProc and retrieves the RawInput information.
/// </summary>
/// <param name="lParam">Pointer.</param>
/// <returns>RawInput.</returns>
public static RawInput GetRawInputData(IntPtr lParam)
{
if (lParam == IntPtr.Zero)
{
throw new ArgumentException($"{nameof(lParam)} pointer is not set.");
}
uint dwSize = 0;
int callResult;
int win32error;
IntPtr rawInputBuffer = IntPtr.Zero;
bool rawInputBufferAllocated = false;
try
{
callResult = WinApi.User32.Api.GetRawInputData(lParam, RawInputCommand.Input, IntPtr.Zero, ref dwSize, Marshal.SizeOf(typeof(RawInputHeader)));
if (callResult != 0)
{
win32error = Marshal.GetLastWin32Error();
if (win32error > 0)
{
throw new Win32ErrorCode($"GetLastWin32Error: {win32error}");
}
else
{
throw new BadResultException($"GetRawInputData returned {callResult} (pData == null)");
}
}
rawInputBuffer = Marshal.AllocHGlobal((int)dwSize);
rawInputBufferAllocated = true;
RawInput ri;
callResult = WinApi.User32.Api.GetRawInputData(lParam, RawInputCommand.Input, rawInputBuffer, ref dwSize, Marshal.SizeOf(typeof(RawInputHeader)));
if (callResult != dwSize)
{
win32error = Marshal.GetLastWin32Error();
if (win32error > 0)
{
throw new Win32ErrorCode($"GetLastWin32Error: {win32error}");
}
else
{
throw new BadResultException($"GetRawInputData returned {callResult} (retrieving rawInputBuffer, dwSize={dwSize})");
}
}
var ribytes = new byte[dwSize];
Marshal.Copy(rawInputBuffer, ribytes, 0, (int)dwSize);
ri = RawInput.FromBytes(ribytes, 0, out int t);
return(ri);
}
finally
{
if (rawInputBufferAllocated)
{
Marshal.FreeHGlobal(rawInputBuffer);
}
}
}