全局低级键盘钩冻结在c＃.net 3.5中

注册全局钩子我有一个令人沮丧的问题。 我在我的Windows应用程序中使用此类：

using System; using System.Diagnostics; using System.Runtime.InteropServices; using System.Windows.Forms; class InterceptKeys { private const int WH_KEYBOARD_LL = 13; private const int WM_KEYDOWN = 0x0100; private static LowLevelKeyboardProc _proc = HookCallback; private static IntPtr _hookID = IntPtr.Zero; public static void Hook() { _hookID = SetHook(_proc); } private static IntPtr SetHook(LowLevelKeyboardProc proc) { using (Process curProcess = Process.GetCurrentProcess()) using (ProcessModule curModule = curProcess.MainModule) { return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0); } } private delegate IntPtr LowLevelKeyboardProc( int nCode, IntPtr wParam, IntPtr lParam); private static IntPtr HookCallback( int nCode, IntPtr wParam, IntPtr lParam) { if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN) { MessageBox.Show("Test"); } return CallNextHookEx(_hookID, nCode, wParam, lParam); } [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc 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); } 

这是Program.cs

 namespace TestHooks { static class Program { /// 
 /// The main entry point for the application. /// 
 [STAThread] static void Main() { InterceptKeys.Hook(); Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } } } 

一切正常（消息框弹出）但窗口冻结片刻，蜂鸣器发出哔哔声。 仅在Vista上的Windows 7上不会出现此问题。 有什么建议吗？

Answer 1

您不能在代码中使用MessageBox。 它会阻止执行，键盘会死机。 例如，使用Console.WriteLine（），输出将转到Visual Studio Output窗口。

请注意，此代码在.NET 4.0上不再起作用，GetModuleHandle（）将返回NULL。