很久之前实现的功能，也是参考其他人的实现，时间太久，具体参考哪里已经记不得了。

这里不仅能屏蔽一般的快捷键，还可以屏蔽ctrl+atl+del。

int globlePid = 0;HHOOK keyHook = NULL;HHOOK mouseHook = NULL;//键盘钩子过程LRESULT CALLBACK keyProc(int nCode, WPARAM wParam, LPARAM lParam){    //在WH_KEYBOARD_LL模式下lParam 是指向KBDLLHOOKSTRUCT类型地址    KBDLLHOOKSTRUCT *pkbhs = (KBDLLHOOKSTRUCT *)lParam;    //如果nCode等于HC_ACTION则处理该消息，如果小于0，则钩子子程就必须将该消息传递给 CallNextHookEx    //if (nCode == HC_ACTION){
        if (pkbhs->vkCode == VK_ESCAPE && GetAsyncKeyState(VK_CONTROL) & 0x8000 && GetAsyncKeyState(VK_SHIFT) & 0x8000){        qDebug() << "Ctrl+Shift+Esc";        return 1;    }    else if (pkbhs->vkCode == VK_ESCAPE && GetAsyncKeyState(VK_CONTROL) & 0x8000){        qDebug() << "Ctrl+Esc";        return 1;    }    else if (pkbhs->vkCode == VK_TAB && pkbhs->flags & LLKHF_ALTDOWN){        qDebug() << "Alt+Tab";        return 1;    }    else if (pkbhs->vkCode == VK_ESCAPE && pkbhs->flags &LLKHF_ALTDOWN){        qDebug() << "Alt+Esc";        return 1;    }    else if (pkbhs->vkCode == VK_LWIN || pkbhs->vkCode == VK_RWIN){        qDebug() << "LWIN/RWIN";        return 1;    }    else if (pkbhs->vkCode == VK_F4 && pkbhs->flags & LLKHF_ALTDOWN){        qDebug() << "Alt+F4";        return 1;    }    //return 1;//返回1表示截取消息不再传递,返回0表示不作处理,消息继续传递    //}    return CallNextHookEx(keyHook, nCode, wParam, lParam);}//鼠标钩子过程LRESULT CALLBACK mouseProc(int nCode, WPARAM wParam, LPARAM lParam){    return 1;}//卸载钩子void unHook(){    UnhookWindowsHookEx(keyHook);    //  UnhookWindowsHookEx(mouseHook);}//安装钩子,调用该函数即安装钩子void setHook(){    //这两个底层钩子,不要DLL就可以全局    //底层键盘钩子    keyHook = SetWindowsHookEx(WH_KEYBOARD_LL, keyProc, GetModuleHandle(NULL), 0);    //底层鼠标钩子    //    mouseHook =SetWindowsHookEx( WH_MOUSE_LL,mouseProc,GetModuleHandle(NULL),0);}//提升权限void EnableDebugPriv(){    HANDLE hToken;    LUID sedebugnameValue;    TOKEN_PRIVILEGES tkp;    if (!OpenProcessToken(GetCurrentProcess(),        TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) {        return;    }    if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &sedebugnameValue)) {        CloseHandle(hToken);        return;    }    tkp.PrivilegeCount = 1;    tkp.Privileges[0].Luid = sedebugnameValue;    tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;    if (!AdjustTokenPrivileges(hToken, FALSE, &tkp, sizeof(tkp), NULL, NULL)) {        CloseHandle(hToken);        return;    }}char* ConvertLPWSTRToLPSTR(LPWSTR lpwszStrIn){    LPSTR pszOut = NULL;    if (lpwszStrIn != NULL)    {        int nInputStrLen = wcslen(lpwszStrIn);        // Double NULL Termination          int nOutputStrLen = WideCharToMultiByte(CP_ACP, 0, lpwszStrIn, nInputStrLen, NULL, 0, 0, 0) + 2;        pszOut = new char[nOutputStrLen];        if (pszOut)        {            memset(pszOut, 0x00, nOutputStrLen);            WideCharToMultiByte(CP_ACP, 0, lpwszStrIn, nInputStrLen, pszOut, nOutputStrLen, 0, 0);        }    }    return pszOut;}//冻结void Freeze(){    //枚举进程信息    PROCESSENTRY32 pe32;    pe32.dwSize = sizeof(pe32);    HANDLE hProcessSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);    int processPid;    //CString strTmp;    BOOL b = ::Process32First(hProcessSnap, &pe32);    while (b)    {        processPid = pe32.th32ProcessID;        char *exeFile = ConvertLPWSTRToLPSTR(pe32.szExeFile);        if (strcmp(exeFile, "winlogon.exe") == 0)        {            break;        }        delete[] exeFile;        b = ::Process32Next(hProcessSnap, &pe32);    }    ::CloseHandle(hProcessSnap);    THREADENTRY32 th32;    th32.dwSize = sizeof(th32);    HANDLE hThreadSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);    globlePid = processPid;    unsigned long Pid;    Pid = processPid;    b = ::Thread32First(hThreadSnap, &th32);    while (b)    {        if (th32.th32OwnerProcessID == Pid)        {            HANDLE oth = OpenThread(THREAD_ALL_ACCESS, FALSE, th32.th32ThreadID);            if (!(::SuspendThread(oth)))            {                qDebug() << "freeze successed";            }            else            {                qDebug() << "freeze failed";            }            CloseHandle(oth);            break;        }        ::Thread32Next(hThreadSnap, &th32);    }    ::CloseHandle(hThreadSnap);}void unFreeze(){    unsigned long Pid;    Pid = globlePid;    THREADENTRY32 th32;    th32.dwSize = sizeof(th32);    HANDLE hThreadSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);    BOOL b = ::Thread32First(hThreadSnap, &th32);    while (b)    {        if (th32.th32OwnerProcessID == Pid)        {            HANDLE oth = OpenThread(THREAD_ALL_ACCESS, FALSE, th32.th32ThreadID);            if (::ResumeThread(oth))            {                qDebug() << "unfreeze successed";            }            else            {                qDebug() << "unfreeze failed";            }            CloseHandle(oth);            break;        }        ::Thread32Next(hThreadSnap, &th32);    }    ::CloseHandle(hThreadSnap);}

调用：

//屏蔽ctrl+alt+del　　EnableDebugPriv();　　Freeze();    //屏蔽其他快捷键 　　setHook();