c# - 在不删除当前正在运行的应用程序的情况下设置鼠标挂钩？

Question

我有一个在运行时打开 GUI 的程序。然后我想使用 dllimports 设置一个鼠标钩，但为了让它工作，我必须在同一个类中调用一个新的 Application.Run()。不幸的是，这删除了原来的 GUI。有什么办法可以在原始消息循环上运行鼠标钩？我在这里有点迷路了。

以下是代码的几个关键部分：

//main

public static GUI GUIref;

static void Main()
{
     Application.EnableVisualStyles();
     Application.SetCompatibleTextRenderingDefault(false);
     Application.Run(GUIref = new GUI());
}

.

//Initializing constructor    

    public partial class GUI : Form
    {
        public GUI()
        {
            InitializeComponent();
            keyReceive kR = new keyReceive();
            mouseReceive mR = new mouseReceive();
        }
    }

.

//mousehook class:

    public class mouseReceive : Form
    {
        private static LowLevelMouseProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;
        public mouseReceive()
        {
            _hookID = SetHook(_proc);
            //***This is where I have been putting Application.Run() to make the mousehook work***
            UnhookWindowsHookEx(_hookID);
        }

        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)
            {
                MessageBox.Show("");

            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }

        private const int WH_MOUSE_LL = 14;

        private enum MouseMessages
        {
            WM_LBUTTONDOWN = 0x0201
        }


        [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);
    }

Answer 1

在 mouseReceive 构造函数中，您正在设置挂钩，然后立即取消挂钩。如果将 Application.Run() 插入注释所在的位置，则会阻塞线程，直到新窗口关闭，因此钩子不会解开并且可以工作。真正的解决方法是从构造函数中删除 UnhookWindowsHookEx(_hookID) 并将其放入 IDisposable 模式。

旁注：如果您尝试实例化多个 mouseReceive 类的实例，您也可能会遇到问题，因为它具有 _proc 和 _hookID 的静态成员。