c# - 如何从SetWindowsHookEx中区分触摸与鼠标事件

Question

我找到了一种监听鼠标事件的方法，但我真正想要的是触摸事件而不是鼠标。他们似乎共享相同的代码。有没有办法判断事件是触摸而不是鼠标？谢谢

    [DllImport("user32.dll")]
    static extern IntPtr SetWindowsHookEx(int idHook, LowLevelMouseProc callback, IntPtr hInstance, uint threadId);

    [DllImport("kernel32.dll")]
    static extern IntPtr LoadLibrary(string lpFileName);

    private delegate IntPtr LowLevelMouseProc (int nCode, IntPtr wParam, IntPtr lParam);

    const int WH_MOUSE_LL = 14;
    const int WM_KEYDOWN = 0x100;

    private LowLevelMouseProc _proc = hookProc;

    private static IntPtr hhook = IntPtr.Zero;

    public void SetHook()
    {
        IntPtr hInstance = LoadLibrary("User32");
        hhook = SetWindowsHookEx(WH_MOUSE_LL, _proc, hInstance, 0);
    }

    public static IntPtr hookProc(int code, IntPtr wParam, IntPtr lParam)
    {

        System.Diagnostics.Debug.Print("Param: " + wParam + ", CODE: " + code + "\n");
    }

    private void Form1_Load(object sender, RoutedEventArgs e)
    {
        SetHook();
    }

Answer 1

回调的lParam参数hookProc是一个指向MSLLHOOKSTRUCT. 它包含了一个非常不良记录dwExtraInfo的变量，它会告诉你它是否是从触摸而产生。

如果 中的所有位0xFF515700都设置在 中dwExtraInfo，则调用回调以响应触摸：

[StructLayout(LayoutKind.Sequential)]
struct MSLLHOOKSTRUCT
{
    public POINT pt;
    public uint mouseData;
    public uint flags;
    public uint time;
    public IntPtr dwExtraInfo;
}

const int TOUCH_FLAG = 0xFF515700;
bool IsTouch(IntPtr lParam)
{
    MSLLHOOKSTRUCT hookData = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, 
        typeof(MSLLHOOKSTRUCT));
    uint extraInfo = (uint)info.dwExtraInfo.ToInt32();
    if ((extraInfo & TOUCH_FLAG) == TOUCH_FLAG)
        return true;
    return false;
}