Windows锁屏实现

1、屏蔽键盘鼠标，利用HOOK封锁键盘和鼠标。

//键盘HOOK回调
LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam) {if (nCode == HC_ACTION && wParam == WM_KEYDOWN){LPKBDLLHOOKSTRUCT pKbs = (LPKBDLLHOOKSTRUCT)lParam;if (pKbs->vkCode == VK_RETURN){g_widgetApp->quitApp();}}if (nCode >= 0)return 1;elsereturn CallNextHookEx(g_KeyboardHook, nCode, wParam, lParam);
}//鼠标HOOK回调
LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam) {if (nCode == 0) return 1;return CallNextHookEx(g_MouseHook, nCode, wParam, lParam);
}//设置HOOK
void QtWidgetsApplication1::installHook()
{//安装键盘钩子g_KeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardProc, NULL, 0);qDebug() << "SetHook keyboard" << (g_KeyboardHook != NULL);//安装鼠标钩子g_MouseHook = SetWindowsHookEx(WH_MOUSE_LL, MouseProc, NULL, 0);qDebug() << "SetHook mouse" << (g_MouseHook != NULL);
}//取消设置HOOK
void QtWidgetsApplication1::uninstallHook()
{if (g_KeyboardHook)qDebug() << "Unhook keyboard:" << (bool)UnhookWindowsHookEx(g_KeyboardHook);if(g_MouseHook)qDebug() << "Unhook mouse:" << (bool)UnhookWindowsHookEx(g_MouseHook);
}

2、上面的HOOK却屏蔽不了Ctrl+Alt+Del，可以挂起winlogon.exe进程，强制它不处理Ctrl+Alt+Del事件

//挂起winlogon.exe进程 即可使Ctrl+Alt+Del失效
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);char *exeFile = 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);g_processId = 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";QMessageBox::information(nullptr, "提示", "freeze failed");}CloseHandle(oth);break;}::Thread32Next(hThreadSnap, &th32);}::CloseHandle(hThreadSnap);
}//恢复winlogon.exe进程
void unFreeze()
{unsigned long Pid;Pid = g_processId;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{QMessageBox::information(nullptr, "提示", "unfreeze failed");qDebug() << "unfreeze failed";}CloseHandle(oth);break;}::Thread32Next(hThreadSnap, &th32);}::CloseHandle(hThreadSnap);
}

3、第2步需要提升调试权限和管理员权限

//提升Debug权限
void EnableDebugPriv()
{HANDLE hToken;LUID luid;TOKEN_PRIVILEGES tkp;OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken);LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &luid);tkp.PrivilegeCount = 1;tkp.Privileges[0].Luid = luid;tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;AdjustTokenPrivileges(hToken, false, &tkp, sizeof(tkp), NULL, NULL);CloseHandle(hToken);
}//判断当前是否是以管理员权限运行的
bool IsProcessRunAsAdmin()
{SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;PSID AdministratorsGroup;BOOL b = AllocateAndInitializeSid(&NtAuthority,2,SECURITY_BUILTIN_DOMAIN_RID,DOMAIN_ALIAS_RID_ADMINS,0, 0, 0, 0, 0, 0,&AdministratorsGroup);if (b){CheckTokenMembership(NULL, AdministratorsGroup, &b);FreeSid(AdministratorsGroup);}return b == TRUE;
}//以Admin权限运行程序
short GetAdmin()
{if (IsProcessRunAsAdmin())return 0;CHAR Path[MAX_PATH];ZeroMemory(Path, MAX_PATH);::GetModuleFileNameA(NULL, Path, MAX_PATH);           //获取程序路径HINSTANCE res;res = ShellExecuteA(NULL, "runas", Path, NULL, NULL, SW_SHOW);if ((int)res > 32)return 1;elsereturn 0;
}int main(int argc, char *argv[])
{//以管理员身份启动的进程继续运行，当前进程退出if (GetAdmin() == 1)return 0;QApplication a(argc, argv);QtWidgetsApplication1 w;w.show();return a.exec();
}

4、窗口设置全屏

//全屏置顶显示
setWindowFlags(Qt::Dialog | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
this->showFullScreen();

5、启动的时候如果任务管理器在，关掉任务管理器，防止上面的设置失效

//关闭任务管理器
void closeTaskMngr()
{DWORD dwProcessID = FindProcessId("Taskmgr.exe");if (dwProcessID != 0){HANDLE hProcess = ::OpenProcess(PROCESS_TERMINATE, FALSE, dwProcessID);::TerminateProcess(hProcess, 0);CloseHandle(hProcess);}
}

6、第一步的时候保留了一个回车键用来退出锁屏，进程退出的时候注意要取消安装的钩子和恢复winlogon.exe进程。

以上，一个简单的锁屏程序就完成了，后面我们就可以再加些为所欲为的功能了，比如开机锁屏，计时锁屏、密码解锁等等。【狗头】

完整代码传送门：

Windows下利用HOOK和进程挂起实现的桌面锁屏-C++文档类资源-CSDN文库https://download.csdn.net/download/hanzhaoqiao1436/87392878

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