Qt QFileDialog的默认路径

Windows Path Variables:

My Computer (already included by default)
Desktop: %USERPROFILE%\Desktop
Drive C: %SystemDrive%
My Documents: (VARIES) - Windows Vista/7/8: %USERPROFILE%\Documents - Windows XP: "%USERPROFILE%\My Documents"
My Music: (SAME AS My Documents, respectively)
My Pictures: (SAME AS My Documents, respectively)
My Videos: (SAME AS My Documents, respectively)
My Downloads: - Usually %USERPROFILE%\Downloads, but older versions of Windows also used My Documents\Downloads.
home folder (already included by default)

举例:

打开桌面: (WIN7下)

	QString _document = QProcessEnvironment::systemEnvironment().value("USERPROFILE")+"\\Desktop";	
	const QStringList fileNames = QFileDialog::getOpenFileNames(this,
		QString::fromLocal8Bit("打开文件"), _document,
		QString::fromLocal8Bit("图片文件(*.jpg;*.png;*.bmp;*.gif;)"));