qt共享内存方法限制执行一次。

int main(int argc, char **argv){    QApplication app(argc, argv);    QCoreApplication::setOrganizationName("Company");    QCoreApplication::setApplicationName("AppName");    QString strKey = QCoreApplication::organizationName() + QCoreApplication::applicationName();    QSharedMemory sharedMemory(strKey);    if (!sharedMemory.create(512, QSharedMemory::ReadWrite))    {        QMessageBox::information(NULL, QStringLiteral("提示"), QStringLiteral("程序已运行！"));        exit(0);    }    MainWindow window;    window.show();    return app.exec();}

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