QT学习---文件对话框

以文件打开对话框使用为例：

方法一，使用QFileDialog提供的静态成员函数：

QString path = QFileDialog::getOpenFileName(this,"OpenImages","C:\","ImageFiles(*.png *.jpg)");
	if (path.length() == 0)
	{
		QMessageBox::information(NULL,"path","you didn't select any files");
	}
	else
	{
		QMessageBox::information(NULL,"path","you select: " + path);
	}Q