全局鼠标事件处理程序

我有我从某处捕捉鼠标事件的以下代码。 我修改了它，并创build了一个事件处理程序，以便我可以订阅它。 鼠标事件被正确捕获。 但它永远不会触发事件处理程序。 任何人都可以弄清楚代码有什么问题吗？

public static class MouseHook { public static event EventHandler 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 EventArgs()); } return CallNextHookEx(_hookID, nCode, wParam, lParam); } private const int WH_MOUSE_LL = 14; private enum MouseMessages { WM_LBUTTONDOWN = 0x0201, WM_LBUTTONUP = 0x0202, WM_MOUSEMOVE = 0x0200, WM_MOUSEWHEEL = 0x020A, 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); } 

我这样订阅。

  MouseHook.Start(); MouseHook.MouseAction += new EventHandler(Event); 

接收事件的函数

  private void Event(object sender, EventArgs e) { Console.WriteLine("Left mouse click!"); } 

更新：我将工作代码放在一个用于用户操作钩子的开源nuget包中。

Answer 1

  return SetWindowsHookEx(WH_MOUSE_LL, proc, GetModuleHandle(curModule.ModuleName), 0); 

在Windows 8之前的版本上运行.NET 4时，此代码将失败。CLR不再模拟托pipe程序集的非托pipe模块句柄。 您无法在代码中检测到此失败，因为它缺less所需的错误检查。 在GetModuleHandle和SetWindowsHookEx上。 winapi不会抛出错误检查，当你捏，winapi不会抛出exception。 检查他们是否返回IntPtr.Zero，当他们这样做时，简单地抛出一个Win32Exception。

修复很简单，SetWindowsHookEx（）需要一个有效的模块句柄，但实际上在设置低级别的鼠标钩子时并不使用它。 所以任何句柄都可以，你可以传递user32.dll的句柄，总是加载到.NET应用程序中。 固定：

  IntPtr hook = SetWindowsHookEx(WH_MOUSE_LL, proc, GetModuleHandle("user32"), 0); if (hook == IntPtr.Zero) throw new System.ComponentModel.Win32Exception(); return hook; 

Answer 2

我只是将你的代码复制到一个简单的Windows窗体中，并按照你所描述的那样工作。 你是怎么用它的？ 你在哪里开始和附加事件？

为了完整起见，这是我结束的代码 – 从一个简单的C＃表单模板开始

 using System; using System.Diagnostics; using System.Runtime.InteropServices; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); MouseHook.Start(); MouseHook.MouseAction += new EventHandler(Event); } private void Event(object sender, EventArgs e) { Console.WriteLine("Left mouse click!"); } } public static class MouseHook { public static event EventHandler 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 EventArgs()); } return CallNextHookEx(_hookID, nCode, wParam, lParam); } private const int WH_MOUSE_LL = 14; private enum MouseMessages { WM_LBUTTONDOWN = 0x0201, WM_LBUTTONUP = 0x0202, WM_MOUSEMOVE = 0x0200, WM_MOUSEWHEEL = 0x020A, 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); } }