linux qt pid文件

#include <QCoreApplication>
#include <QFile>
#include <QTextStream>
#include <QDebug>

void createPidFile(const QString &pidFilePath) {
    QFile pidFile(pidFilePath);
    if (!pidFile.open(QIODevice::WriteOnly | QIODevice::Text)) {
        qCritical() << "Failed to create PID file:" << pidFilePath;
        return;
    }

    QTextStream out(&pidFile);
    out << QCoreApplication::applicationPid();
    pidFile.close();
}

void removePidFile(const QString &pidFilePath) {
    QFile pidFile(pidFilePath);
    if (!pidFile.remove()) {
        qWarning() << "Failed to remove PID file:" << pidFilePath;
    }
}

int main(int argc, char *argv[]) {
    QCoreApplication app(argc, argv);

    QString pidFilePath = "/var/run/myapp.pid";

    // 创建PID文件
    createPidFile(pidFilePath);

    // 应用程序逻辑...

    // 退出时删除PID文件
    QObject::connect(&app, &QCoreApplication::aboutToQuit, [&]() {
        removePidFile(pidFilePath);
    });

    return app.exec();
}