0

我正在 WPF c# 中创建一个应用程序，该应用程序需要能够分别检测鼠标单击和单击事件。为了做到这一点，我使用了我在网上找到的 Global Mouse Hook 的代码。代码的唯一问题是它使用 EventArgs 作为 EventHandler，因此每次我发送 MouseUp 和 MouseDown 时它都会传递相同的函数。为了解决这个问题，我使用了 MouseButtonEventArgs 构造函数。我现在遇到的问题是构造函数需要 3 个参数：MouseDevice、时间戳和 MouseButton，构造函数才能实际工作。我已经弄清楚了时间戳和 MouseButton，但我不知道该为 MouseDevice 放置什么。我在这里放什么来使构造函数工作？这是我的低级鼠标钩类代码。

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Input;

namespace KeystrokeDisplay
{
    public static class MouseHook
    {
        public static event MouseEventHandler MouseAction = delegate {  };

        public static void Start()
        {
            _hookID = SetHook(_proc);


        }
        public static void stop()
        {
            UnhookWindowsHookEx(_hookID);
        }

        private static LowLevelMouseProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;

        private static IntPtr SetHook(LowLevelMouseProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_MOUSE_LL, proc,
                  GetModuleHandle(curModule.ModuleName), 0);
            }
        }

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

        private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && MouseMessages.WM_LBUTTONDOWN == (MouseMessages)wParam)
            {
                MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
                MouseAction(null, new MouseButtonEventArgs(mouse: ????????, timestamp: 0, button: MouseButton.Left)); 
            }
            if (nCode >= 0 && MouseMessages.WM_LBUTTONUP == (MouseMessages)wParam)
            {
                MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
                MouseAction(null, new MouseButtonEventArgs(mouse: ????????, timestamp: 0, button: MouseButton.Left)); 
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }

        public const int WH_MOUSE_LL = 14;

        public enum MouseMessages
        {
            WM_LBUTTONDOWN = 0x0201,
            WM_LBUTTONUP = 0x0202,
     
            WM_RBUTTONDOWN = 0x0204,
            WM_RBUTTONUP = 0x0205
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct POINT
        {
            public int x;
            public int y;
        }

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

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook,
          LowLevelMouseProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
          IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);


    }
}

我该如何解决？另外，我对 c# 还很陌生，所以我可能需要一些额外的帮助来理解你的答案。

4

1 回答 1

1

我看不出有任何理由使用MouseEventHandler.

您想分别检测鼠标单击和单击事件，因此您可以为鼠标单击和单击创建两个委托并传递自己的事件参数。您只对按下了哪个鼠标按钮感兴趣。

public delegate void MouseUpEventHandler(object sender, MyMouseEventArgs e);
public delegate void MouseDownEventHandler(object sender, MyMouseEventArgs e);

public class MyMouseEventArgs : EventArgs
{
    public MouseButton MouseButton { get; }

    public MyMouseEventArgs(MouseButton mouseButton)
    {
        MouseButton = mouseButton;
    }
}

然后更换

public static event MouseEventHandler MouseAction = delegate {  };

和

public static event MouseUpEventHandler MouseUpAction = delegate {  };
public static event MouseDownEventHandler MouseDownAction = delegate {  };

在HookCallback调用MouseDownAction或MouseUpAction.

private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0 && MouseMessages.WM_LBUTTONDOWN == (MouseMessages)wParam)
    {
        MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
        MouseDownAction(null, new MyMouseEventArgs(MouseButton.Left)); 
    }
    if (nCode >= 0 && MouseMessages.WM_LBUTTONUP == (MouseMessages)wParam)
    {
        MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
        MouseUpAction(null, new MyMouseEventArgs(MouseButton.Left)); 
        }
        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }
于 2021-02-22T09:17:07.337 回答