qt prevent application repetition priming

A the QApplication (argc, the argv);
QSharedMemory Singleton (a.applicationName ());
IF (singleton.create (. 1)!)
{
A QMessageBox :: warning (NULL, "a Waring", "Program already running!");
Return to false ;
}
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author: whatnamecaniuse
source: CSDN
original: https: //blog.csdn.net/whatnamecaniuse/article/details/80563146
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