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  • Qt保证只有一个实例(将CreateMutex得到的handle通过转换得到值)

    使用CreateMutex 可以实现只启动一个应用程序实例


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    #include <QApplication>
    #include <QtNetwork>
    #include "mydlg.h"

    #ifdef Q_WS_WIN
    #include <windows.h>
    #endif

    int main(int argc, char * argv[]) {
    QApplication app(argc,argv);
    #ifdef Q_WS_WIN
    HANDLE hMutex = CreateMutex(NULL, true, QString("['{EFEB2EF6-F8E0-AE44-BABE-1BBEF2C7FD56}']").toStdWString().c_str());
    if (GetLastError() == ERROR_ALREADY_EXISTS)
    {
    CloseHandle(hMutex);
    QMessageBox::information(NULL, "Info", "Has been Run", "OK");
    app.exit(1);
    return 1;
    }
    #endif
    myDlg *win = new myDlg;
    win->showLoginForm();
    return app.exec();
    }
    #include <QApplication>
    #include <QtNetwork>
    #include "mydlg.h"

    #ifdef Q_WS_WIN
    #include <windows.h>
    #endif

    int main(int argc, char * argv[]) {
    QApplication app(argc,argv);
    #ifdef Q_WS_WIN
    HANDLE hMutex = CreateMutex(NULL, true, QString("['{EFEB2EF6-F8E0-AE44-BABE-1BBEF2C7FD56}']").toStdWString().c_str());
    if (GetLastError() == ERROR_ALREADY_EXISTS)
    {
    CloseHandle(hMutex);
    QMessageBox::information(NULL, "Info", "Has been Run", "OK");
    app.exit(1);
    return 1;
    }
    #endif
    myDlg *win = new myDlg;
    win->showLoginForm();
    return app.exec();
    }

    砖头不离身推荐阅读:

    Vega Prime的简介

    http://blog.sina.com.cn/s/blog_668aae7801017gib.html

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  • 原文地址:https://www.cnblogs.com/findumars/p/5055125.html
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