问在运行时将更改后的环境变量应用于QApplication

EN

qputenv("QT_DEBUG_PLUGINS", "1");

#include <QApplication>
#include "mainwindow.h"


int main(int argc, char *argv[])
{
    int exitCode = 0;
    do
    {
        //exitCode = EXIT_CHANGE_DEBUG_FLAG; //This will make it ALWAYS work

        //Double-checking for testing only, still does not work.
        if(exitCode == EXIT_CHANGE_DEBUG_FLAG)
        {
            qputenv("QT_DEBUG_PLUGINS", "1"); // Code does fire on 2nd pass, new app/window still ignores it
        }
        QApplication app(argc, argv);
        MainWindow mainWindow;
        mainWindow.show();
        exitCode = app.exec();
        //We can't change this once the app has been established.
        qputenv("QT_DEBUG_PLUGINS", "1");
        exitCode = EXIT_CHANGE_DEBUG_FLAG; //for testing only
    }
    while(exitCode == EXIT_CHANGE_DEBUG_FLAG);
    return(exitCode);
}