c# - 如何从SetWindowsHookEx中区分触摸与鼠标事件 [英] how to distinguish touch vs mouse event from SetWindowsHookEx in c#

问题描述

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

I have found a way to listen to the mouse event, but what I really want is the touch event not mouse. They seem to share the same code. Is there any way to tell if the event was touch and not mouse? Thanks

    [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();
    }

推荐答案

hookProc 回调的 lParam 参数是一个指向 MSLLHOOKSTRUCT 的指针>.它包含一个非常记录不佳的dwExtraInfo变量，它告诉你它是否是通过触摸生成的.

The lParam argument of your hookProc callback is a pointer to an MSLLHOOKSTRUCT. It contains a very poorly documented dwExtraInfo variable, which tells you whether it was generated from a touch.

如果 0xFF515700 中的所有位都在 dwExtraInfo 中设置，则回调被调用以响应触摸:

If all of the bits in 0xFF515700 are set in dwExtraInfo, then the callback was invoked in response to a touch:

[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;
}

这篇关于c# - 如何从SetWindowsHookEx中区分触摸与鼠标事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！