QT console output in GUI applications- Console output in a Qt GUI app?

problem ：

I have a Qt GUI application running on Windows that allows command-line options to be passed and under some circumstances I want to output a message to the console and then quit, for example: I have one in Windows Running on Qt GUI Applications , It allows you to pass command line options , In some cases , I want to output a message to the console and exit , for example ：

int main(int argc, char *argv[]){  QApplication a(argc, argv);  if (someCommandLineParam)  {    std::cout << "Hello, world!";    return 0;  }  MainWindow w;  w.show();  return a.exec();}

However, the console messages do not appear when I run the app from a command-prompt. however , When I run the application from the command prompt , Console messages will not appear .Does anyone know how I can get this to work? Who knows how I can make it work ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/E6EO