屏蔽键盘任意键的DLL文件制作

在网上找到一个不错的方法，帖出来看看

头文件maskkey.h:

/**//********************************************************************/
/**//* 文件名: MaskKey.h                                                */
/**//*                                                                  */
/**//* 功能: 标准 DLL 导出函数头文件, 在使用该DLL的程序中包含此文件     */
/**//*                                                                  */
/**//* 作者: 卢培培 (goodname008)             时间: 2004.8.21           */
/**//*                                                                  */
/**//* BLOG: http://blog.csdn.net/goodname008                           */
/**//********************************************************************/
DECLSPEC_IMPORT
BOOL
WINAPI
StartMaskKey(     LPDWORD lpdwVirtualKey,     int nLength,     BOOL bDisableKeyboard = FALSE     );
DECLSPEC_IMPORT
BOOL
WINAPI
StopMaskKey();

实现文件maskkey.cpp：

 

/**//********************************************************************/

/**//* 文件名: MaskKey.cpp                                              */

/**//*                                                                  */

/**//* 功能: 标准 DLL ---- 利用底层键盘钩子实现屏蔽键盘任意按键         */

/**//*                                                                  */

/**//* 作者: 卢培培 (goodname008)             时间: 2004.8.21           */

/**//*                                                                  */

/**//* BLOG: http://blog.csdn.net/goodname008                           */

/**//********************************************************************/

 

// 导出函数列表

// StartMaskKey

// StopMaskKey

 

#define _WIN32_WINNT  0x0500                   // 设置系统版本, 确保可以使用底层键盘钩子

 

#include "windows.h"

 

// 全局变量

LPDWORD       g_lpdwVirtualKey = NULL;         // Keycode 数组的指针

int           g_nLength = 0;                   // Keycode 数组的大小

BOOL          g_bDisableKeyboard = FALSE;      // 是否屏蔽整个键盘

HINSTANCE     g_hInstance = NULL;              // 模块实例句柄

HHOOK         g_hHook = NULL;                  // 钩子句柄

 

// DLL 入口函数

BOOL APIENTRY DllMain(HANDLE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)

...{

     // 保存模块实例句柄

     g_hInstance = (HINSTANCE)hModule;

     

     // 在进程结束或线程结束时卸载钩子

     switch (ul_reason_for_call)

     ...{

     case DLL_PROCESS_ATTACH:

         break;

     case DLL_THREAD_ATTACH:

         break;

     case DLL_PROCESS_DETACH:

     case DLL_THREAD_DETACH:

         delete g_lpdwVirtualKey;

         if (g_hHook != NULL) UnhookWindowsHookEx(g_hHook);

         break;

     }

    return TRUE;

}

 

// 底层键盘钩子函数

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)

...{

     // 禁用键盘的某个按键, 如果 g_bDisableKeyboard 为 TRUE 则禁用整个键盘

     if (nCode == HC_ACTION)

     ...{

         if (g_bDisableKeyboard) return TRUE;

         KBDLLHOOKSTRUCT* pStruct = (KBDLLHOOKSTRUCT*)lParam;

         LPDWORD tmpVirtualKey = g_lpdwVirtualKey;

         for (int i = 0; i < g_nLength; i++)

         ...{

              if (pStruct->vkCode == *tmpVirtualKey++)

                   return TRUE;

         }

         

     }

     

     // 传给系统中的下一个钩子

     return CallNextHookEx(g_hHook, nCode, wParam, lParam);

}

 

/**//********************************************************************/

/**//* 开始屏蔽键盘按键                                                 */

/**//*                                                                  */

/**//* 参数:                                                            */

/**//*            lpdwVirtualKey         Keycode 数组的指针             */

/**//*            nLength                Keycode 数组的大小             */

/**//*            bDisableKeyboard       是否屏蔽整个键盘               */

/**//*                                                                  */

/**//* 返回值:    TRUE 成功, FALSE 失败                                 */

/**//********************************************************************/

BOOL WINAPI StartMaskKey(LPDWORD lpdwVirtualKey, int nLength, BOOL bDisableKeyboard = FALSE)

...{

     // 如果已经安装键盘钩子则返回 FALSE

     if (g_hHook != NULL) return FALSE;

     

     // 将用户传来的 keycode 数组保存在全局变量中

     g_lpdwVirtualKey = (LPDWORD)malloc(sizeof(DWORD) * nLength);

     LPDWORD tmpVirtualKey = g_lpdwVirtualKey;

     for (int i = 0; i < nLength; i++)

     ...{

         *tmpVirtualKey++ = *lpdwVirtualKey++;

     }

     g_nLength = nLength;

     g_bDisableKeyboard = bDisableKeyboard;

     

     // 安装底层键盘钩子

     g_hHook = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, g_hInstance, NULL);

     if (g_hHook == NULL) return FALSE;

     return TRUE;

     

}

 

/**//********************************************************************/

/**//* 停止屏蔽键盘按键                                                 */

/**//*                                                                  */

/**//* 参数: (无)                                                       */

/**//*                                                                  */

/**//* 返回值:    TRUE 成功, FALSE 失败                                 */

/**//********************************************************************/

BOOL WINAPI StopMaskKey()

...{

     // 卸载钩子

     if (UnhookWindowsHookEx(g_hHook) == 0) return FALSE;

     g_hHook = NULL;

     return TRUE;

}

DEF文件 maskkey.def:

 

EXPORTS

StartMaskKey       @1

StopMaskKey        @2