IPBS_Station/main.cpp

#include "widget.h"
#include <QApplication>
#include <QCoreApplication>
#include <QProcess>
#include <QSharedMemory>

int main(int argc, char *argv[])
{
    static QSharedMemory *shareMem = new QSharedMemory("IPBS_Station"); //创建“SingleApp”的共享内存块
    if (!shareMem->create(1))//创建大小1b的内存
    {
//        QMessageBox::information(nullptr, "提示", "程序已经运行了!");
//        qApp->quit(); //创建失败，说明已经有一个程序运行，退出当前程序
        return -1;
    }
    QApplication a(argc, argv);
    Widget w;
    w.show();
    try {
        return a.exec();
    } catch (...) {
        // 发生异常时重启程序
        QProcess::startDetached(QApplication::applicationFilePath(), QApplication::arguments());
        exit(1);
    }
}