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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输入，不过键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);
}
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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
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if ((this.hHook = SetWindowsHookEx(WH_KEYBOARD, KeyBoardProc, NULL,
GetCurrentThreadId())) == NULL) Console.WriteLine("Unable to establish a
keyboard hook."); }
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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);
}
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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);
}
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