前几天因为工作需要用到钩子，而且是全局钩子，用来监视别人的程序键盘消息。需要注意几点
1.如果只需要监视自己的应用程序，在自己程序里设置钩子就行。
2.如果需要监视别人的应用程序，一定要做成DLL形式的全局钩子。
首先我是用VS新建一个DLL 工程。头文件如下
#ifndef __KEYHOOK_H_H#define __KEYHOOK_H_H#ifdef MY_HOOK_API#else#define MY_HOOK_API _declspec(dllimport)#endif#ifdef __cplusplusextern "C" {#endif MY_HOOK_API BOOL __stdcall Reg_raw_input(HWND hwnd);//注册输入信息，这个可以不要，因为自己工作的原因需要加上MY_HOOK_API BOOL __stdcall InstallHook();MY_HOOK_API BOOL __stdcall UnInstallHook();#ifdef __cplusplus}#endif #endif
.CPP文件
自己使用RegisterRawInputDevices这个函数时有一个小问题卡了很久，用这个RIDEV_INPUTSINK标志时（即窗口不在前台时也台捕捉输入源信息），微软文档明确说明不用指定hwndTarget，试了很多次也不成功。然后直接有DLL用FindWindows找自己需要的句柄传给hwndTarget，还是返回失败，只有设置RIM_INPUT才可以，最后偶尔把上层应用的主窗口GetSafeWind()返回的句柄给hwndTarget时才成功。
BOOL __stdcall Reg_raw_input(HWND hwnd){static bool bReg_raw_input = false;if(bReg_raw_input)return FALSE; RAWINPUTDEVICE dev;memset(&dev, 0, sizeof(dev));dev.usUsagePage = 1;dev.usUsage = 6;dev.dwFlags = RIDEV_INPUTSINK;//dev.dwFlags = RIDEV_INPUTSINK;//RIM_INPUT;//Shejn /7/17 16:34:31 adddev.hwndTarget = hwnd;BOOL bReg = RegisterRawInputDevices(&dev, 1, sizeof(dev));bReg_raw_input = true;return bReg;};BOOL __stdcall InstallHook(){BOOL bRet = 1;UProductCmd cmd;bNewKey = cmd.IsUseKeyNewMap();_hHook_msg1 = SetWindowsHookEx(WH_GETMESSAGE, msg_hook_Proc1,g_hInst, NULL);//GetCurrentThreadId());最后一个参数为0表明监视所有线程而不是本身if (_hHook_msg1 == NULL){bRet = 0;}g_hHook = SetWindowsHookEx(WH_KEYBOARD_LL,//这里使用底层键盘钩子，在键盘动产生作用前就响应，而且底层钩子比消息钩子先响应LowLevelKeyboardProc,g_hInst,NULL);if (g_hHook == NULL){bRet = 0;}return bRet;//return g_hHook == NULL ? FALSE : TRUE;}BOOL __stdcall UnInstallHook(){UnhookWindowsHookEx(_hHook_msg1); return UnhookWindowsHookEx(g_hHook);}BOOL WINAPI DllMain(IN HINSTANCE hDllHandle,IN DWORD nReason,IN LPVOID Reserved){//g_hInst = hDllHandle;//return TRUE;switch (nReason){case DLL_PROCESS_ATTACH:g_hInst=HINSTANCE(hDllHandle);break;case DLL_THREAD_ATTACH:break;case DLL_THREAD_DETACH:break;case DLL_PROCESS_DETACH://UnInstallHook();//这个要注释掉，后来发现如果监视的程序关掉，会直接调用这里，导致全局钩子失效，需要卸载钩子时在上层应用关闭时调用break;}return TRUE;}
下面这段代码注意，如果是回车和空格互换，比如VK_RETURN变成VK_SPACE，keybd_event(VK_SPACE, 0 0, 0);似乎还会键盘钩子捕获到VK_SPACE，为了保险起见，最好设置一个标志，如果是第二个keybd_event产生，则直接return CallNextHookEx(g_hHook, code, wParam, lParam); 这点还没确认，高手可以去确认下。
DWORD dwIndex = 0;BYTE g_bFreezeCAVK[2] = {VK_F2, VK_F8};LRESULT CALLBACK LowLevelKeyboardProc(int code,WPARAM wParam,LPARAM lParam){if(code == HC_ACTION){PKBDLLHOOKSTRUCT pStruct = (PKBDLLHOOKSTRUCT)lParam;switch (pStruct->vkCode){case VK_RETURN:dwIndex = 0;break;case VK_SPACE:dwIndex = 1;break; default:bWork = FALSE;return CallNextHookEx(g_hHook, code, wParam, lParam);}if (wParam == WM_KEYDOWN){keybd_event(g_bVK[dwIndex], MapVirtualKey(g_bVK[dwIndex], 0), 0, 0);return 1;//CallNextHookEx(g_hHook, code, wParam, lParam);//这里注意返回1是原按键无效，如果是CallNextHookEx则会断续传递还会产生原按键消息}}return CallNextHookEx(g_hHook, code, wParam, lParam);}
//消息钩子，这段代码可以忽略，根据自己的需要来LRESULT CALLBACK msg_hook_Proc1(int nCode, WPARAM wParam, LPARAM lParam){MSG* pMsg = (MSG*)lParam;if(nCode < 0)return CallNextHookEx(_hHook_msg1, nCode, wParam, lParam);if(pMsg->message == WM_INPUT){HRAWINPUT hInput = (HRAWINPUT)pMsg->lParam;CString strDev_name = get_dev_name(hInput);UProductCmd cmd;CString strMini_kbd_id = cmd.get_setting("keyboard", "MiniKeyboardID", "Vid_04d9&Pid_1603");strMini_kbd_id.MakeLower();strDev_name.MakeLower();int aTest = strDev_name.Find(strMini_kbd_id);if(strDev_name.Find(strMini_kbd_id) >= 0 && bNewKey)//cmd.IsUseKeyNewMap()){_bHid = true;}else{_bHid = false;}//bWork = TRUE;if (bWork){if(_bHid){if (bFreeze){keybd_event(g_bFreezeCAVK[dwIndex], MapVirtualKey(g_bFreezeCAVK[dwIndex], 0), 0, 0);}elsekeybd_event(g_bLiveCAVK[dwIndex], MapVirtualKey(g_bLiveCAVK[dwIndex], 0), 0, 0);//keybd_event(g_bCAVK[dwIndex], MapVirtualKey(g_bCAVK[dwIndex], 0), 0, 0);if (dwIndex == 0){bFreeze = !bFreeze;}}else{bKeep = TRUE;if (bNewKey){keybd_event(g_bNewVK[dwIndex], MapVirtualKey(g_bNewVK[dwIndex], 0), 0, 0);}else{keybd_event(g_bOldVK[dwIndex], MapVirtualKey(g_bOldVK[dwIndex], 0), 0, 0);}}}bWork = FALSE;}return CallNextHookEx(_hHook_msg1, nCode, wParam, lParam);}
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