使用QDesktopServices打开文件目录或网络连接。
QDesktopServices::openUrl(QUrl::fromLocalFile("C:\\Users\\User\\Documents"));
QDesktopServices::openUrl(QUrl::fromLocalFile("C:/Users/User/Documents"));
QDesktopServices::openUrl(QUrl::fromLocalFile("file:///C:/Users/User/Documents"));
QDesktopServices::openUrl(QUrl("http://www.qtbig.com/about/"));