昨夜风吹处

键盘钩子是一种可以监控键盘操作的指令，我们去钓鱼只要鱼儿上钩

不管它怎么逃，只要掌控好钩子上的绳子总是可以找到这条鱼，键盘

钩子是利用电脑一行行执行代码特性，在目的窗口处理键代码前拦截

把某个指令替换为另外一种指令，然后再把消息传送给目的窗口这样

一个周期下来，，窗口程序会认为用户输入的就是现在的数值或者没有

盘钩子在某些不法分子手里则成为了 盗号、监控密码 等

违法操作。原型：HHOOK SetWindowsHookEx(int idHook, HOOKPROC lpfn, HINSTANCE hMod, DWORD dwThreadId);

// Win32 keyboard hook.public const int WH_KEYBOARD_LL = 13;public const int NULL = 0;public delegate int HookProc(int code, int wParam, KBDLLHOOKSTRUCT lParam);[DllImport("user32.dll", SetLastError = true)]public static extern int SetWindowsHookEx(int hookType, HookProc lpfn, int hMod, int dwThreadId);[DllImport("User32.dll", SetLastError = true)]public extern static int CallNextHookEx(int handle, int code, int wParam, KBDLLHOOKSTRUCT lParam);[StructLayout(LayoutKind.Sequential)]public class KBDLLHOOKSTRUCT{public uint vkCode;public uint scanCode;public KBDLLHOOKSTRUCT flags;public uint time;public UIntPtr dwExtraInfo;}[Flags]public enum KBDLLHOOKSTRUCT : uint{LLKHF_EXTENDED = 0x01,LLKHF_INJECTED = 0x10,LLKHF_ALTDOWN = 0x20,LLKHF_UP = 0x80,}public volatile int hHook;protected override void OnLoad(EventArgs e){base.OnLoad(e);// 安装全局键盘钩子if ((this.hHook = SetWindowsHookEx(WH_KEYBOARD_LL, this.KeyBoardProc, NULL, NULL)) == NULL)Console.WriteLine("Unable to establish a keyboard hook.");}protected int KeyBoardProc(int code, int wParam, KBDLLHOOKSTRUCT lParam){if (lParam.vkCode == (int)Keys.A)return 1; // <span style="font-family: arial, 宋体, sans-serif;font-size:18px; line-height: 24px; text-indent: 28px;">返回1表示拦截消息，返回0表示放行</span>return CallNextHookEx(hHook, code, wParam, lParam);}监控系统内所有进程键盘消息： SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardProc, NULL, NULL)

<pre name="code" class="csharp">// Win32 keyboard hook.public const int WH_KEYBOARD = 2;public const int NULL = 0;public delegate int HookProc(int code, int wParam, int lParam);[DllImport("kernel32.dll", SetLastError = true)]public static extern int GetCurrentThreadId();[DllImport("user32.dll", SetLastError = true)]public static extern int SetWindowsHookEx(int hookType, HookProc lpfn, int hMod, int dwThreadId);[DllImport("User32.dll", SetLastError = true)]public extern static int CallNextHookEx(int handle, int code, int wParam, int lParam);public volatile int hHook;protected override void OnLoad(EventArgs e){base.OnLoad(e);<pre name="code" class="csharp" style="line-height: 24px;font-size:18px;">// 安装键盘钩子 if ((this.hHook = SetWindowsHookEx(WH_KEYBOARD, KeyBoardProc, NULL, GetCurrentThreadId())) == NULL) Console.WriteLine("Unable to establish a keyboard hook."); }

protected int KeyBoardQueue(int code, int wParam, int lParam){if (wParam == (int)Keys.A)return 1; <span style="font-family: arial, 宋体, sans-serif;">// </span><span style="font-family: arial, 宋体, sans-serif;">返回1表示拦截消息，返回0表示放行</span>return CallNextHookEx(hHook, code, wParam, lParam);}监控本进程的所有键盘消息：

SetWindowsHookEx(WH_KEYBOARD, KeyBoardProc, NULL, GetCurrentThreadId());

protected int KeyBoardProc(int code, int wParam, int lParam){if (wParam == (int)Keys.A)return 1;return CallNextHookEx(hHook, code, wParam, lParam);}

接受自己的失败面，是一种成熟，更是一种睿智;