1.在程序的主窗口中设置标题
setWindowTitle("MainWidget");
2.在程序的main函数中加入以下代码
// 杀死主进程
void killProcess()
{
qint64 pid = QCoreApplication::applicationPid();
QString cmd = QString("TASKKILL /PID %1 /T /F").arg(pid);
WinExec(cmd.toLocal8Bit().data(), SW_HIDE);
}
// 程序只能运行一个实例
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
// 程序只能运行一个实例
QSystemSemaphore sys("KoScanCarHMI Key", 1, QSystemSemaphore::Open);
sys.acquire();
QSharedMemory shareMemory;
shareMemory.setKey("KoScanCarHMI App");
bool isRunning = false;
if(shareMemory.attach()) {
isRunning = true;
} else {
shareMemory.create(1);
isRunning = false;
}
sys.release();
if(isRunning) {
LPCSTR app = TEXT("Qt5QWindowIcon");
LPCSTR appCaption = TEXT("KoScanCarHMI");
QString text = "IsWindow";
HWND hwnd = ::FindWindow(app, appCaption);
if(::IsWindow(hwnd)) {
//ShowWindow(hwnd, SW_RESTORE);
showCenterWindow(hwnd);
SetForegroundWindow(hwnd);
}
killProcess();
}
return a.exec();
}