private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == User32.WM_INPUT)
{
User32.RAWINPUTHEADER header = new User32.RAWINPUTHEADER();
var headerSize = (uint)Marshal.SizeOf(header);
uint bufferSize = 0;
uint res = User32.GetRawInputData(lParam, User32.RID_INPUT, IntPtr.Zero, ref bufferSize, headerSize);
if (res == 0)
{
var dataPtr = Marshal.AllocHGlobal((int)bufferSize);
uint writtenBytes = User32.GetRawInputData(lParam, User32.RID_INPUT, dataPtr, ref bufferSize, headerSize);
if (writtenBytes == bufferSize)
{
var rawInput = Marshal.PtrToStructure <User32.RAWINPUT>(dataPtr);
if (rawInput.header.dwType == User32.RIM_TYPEMOUSE)
{
if ((rawInput.mouse.usButtonFlags & User32.RI_MOUSE_WHEEL) == User32.RI_MOUSE_WHEEL)
{
Trace.WriteLine($"RawInputListener WM_INPUT MouseWheel: {rawInput.mouse.usButtonData}");
MouseWheel?.Invoke(this, rawInput.mouse.usButtonData);
}
}
}
Marshal.FreeHGlobal(dataPtr);
}
}
return(IntPtr.Zero);
}
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == User32.WM_INPUT)
{
User32.RAWINPUTHEADER header = new User32.RAWINPUTHEADER();
var headerSize = (uint)Marshal.SizeOf(header);
uint bufferSize = 0;
uint res = User32.GetRawInputData(lParam, User32.RID_INPUT, IntPtr.Zero, ref bufferSize, headerSize);
if (res == 0)
{
var dataPtr = Marshal.AllocHGlobal((int)bufferSize);
uint writtenBytes = User32.GetRawInputData(lParam, User32.RID_INPUT, dataPtr, ref bufferSize, headerSize);
if (writtenBytes == bufferSize)
{
var rawInput = Marshal.PtrToStructure <User32.RAWINPUT>(dataPtr);
if (rawInput.header.dwType == User32.RIM_TYPEMOUSE)
{
if ((rawInput.mouse.usButtonFlags & User32.RI_MOUSE_WHEEL) == User32.RI_MOUSE_WHEEL)
{
Trace.WriteLine($"RawInputListener WM_INPUT MouseWheel: {rawInput.mouse.usButtonData}");
MouseWheel?.Invoke(this, rawInput.mouse.usButtonData);
}
if ((rawInput.mouse.usFlags & User32.RAWMOUSE_FLAGS.MOUSE_MOVE_ABSOLUTE) == User32.RAWMOUSE_FLAGS.MOUSE_MOVE_ABSOLUTE)
{
// We don't expect any absolute changes to position.
// If we do get one, we assume it's a very large change.
Debug.Assert(false);
Stop();
}
else
{
_currentPosRelative.Y += rawInput.mouse.lLastY;
_currentPosRelative.X += rawInput.mouse.lLastX;
if (Math.Abs(_currentPosRelative.X) > MAX_MOVE ||
Math.Abs(_currentPosRelative.Y) > MAX_MOVE)
{
Stop();
}
}
}
}
Marshal.FreeHGlobal(dataPtr);
}
}
return(IntPtr.Zero);
}
public static bool ProcessMouseInputMessage(IntPtr lParam, ref System.Drawing.Point cursorPosition, out int wheelDelta)
{
wheelDelta = 0;
bool isApplicableMouseMessage = false;
var header = new User32.RAWINPUTHEADER();
var headerSize = (uint)Marshal.SizeOf(header);
uint bufferSize = 0;
uint res = User32.GetRawInputData(lParam, User32.RID_INPUT, IntPtr.Zero, ref bufferSize, headerSize);
if (res == 0)
{
var dataPtr = Marshal.AllocHGlobal((int)bufferSize);
uint writtenBytes = User32.GetRawInputData(lParam, User32.RID_INPUT, dataPtr, ref bufferSize, headerSize);
if (writtenBytes == bufferSize)
{
var rawInput = Marshal.PtrToStructure <User32.RAWINPUT>(dataPtr);
if (rawInput.header.dwType == User32.RIM_TYPEMOUSE)
{
isApplicableMouseMessage = true;
if ((rawInput.mouse.usFlags & User32.RAWMOUSE_FLAGS.MOUSE_MOVE_ABSOLUTE) == User32.RAWMOUSE_FLAGS.MOUSE_MOVE_ABSOLUTE)
{
cursorPosition = System.Windows.Forms.Cursor.Position;
}
else
{
cursorPosition.Y += rawInput.mouse.lLastY;
cursorPosition.X += rawInput.mouse.lLastX;
}
if ((rawInput.mouse.usButtonFlags & User32.RI_MOUSE_WHEEL) == User32.RI_MOUSE_WHEEL)
{
wheelDelta = rawInput.mouse.usButtonData;
}
}
}
Marshal.FreeHGlobal(dataPtr);
}
return(isApplicableMouseMessage);
}