qt 防止應用重複啓動

QApplication a(argc, argv);
QSharedMemory singleton(a.applicationName());
if(!singleton.create(1))
{
QMessageBox::warning(NULL, "Waring", "Program already running!");
return false;
}
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做者：whatnamecaniuse
來源：CSDN
原文：https://blog.csdn.net/whatnamecaniuse/article/details/80563146
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