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View Thread: WM_GESTURECOMMAND on Windows 7
  • gillsr

    Hello, I'm trying to write a simple application that listens for WM_gesture messages in c# but don't have the PDC examples. I have got as far as (important snippets):

    [DllImport("user32")]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool GetGestureInfo(System.IntPtr hGestureInfo, [Out] GESTUREINFO pGestureInfo);


    private struct GESTUREINFO
    {
    public int cbSize;
    public int dwFlags;
    public int dwID;
    public System.IntPtr hwndTarget;
    public POINTS ptsLocation;
    public int dwInstanceID;
    public int dwSequenceID;
    public ulong ullArguments;
    public int cbExtraArgs;}

    GESTUREINFO gi = new GESTUREINFO();
    gi.cbSize = Marshal.SizeOf(gi);
    gi.dwFlags = 0;
    gi.ptsLocation.x = 0;
    gi.ptsLocation.y = 0;
    gi.dwID = 0;
    gi.dwInstanceID = 0;
    gi.dwSequenceID = 0;

    try
    {
    bResult = GetGestureInfo(m.LParam, gi);
    }
    catch (Exception)
    {
    throw;
    }

    But always get:
    Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
    on the GetgestureInfo call

    Anyone have any advice?

    (Running Dell XT & ntrig multitouch driver on Win7 public beta)