QT随手笔记（六）——更新界面、截图、文件对话框

一、更新界面

update();//不及时
qApp->processEvents();//及时更新

二、截图并保存

QScreen * screen = QGuiApplication::primaryScreen();
	QPixmap p = screen->grabWindow(ui.CO_chart->winId());
	QImage image = p.toImage();
	QString name = path  + "123.png";
	image.save(name);

三、文件对话框，获取文件名及路径

QString OpenFile;//文件路径+文件名
QString  OpenFilePath;//文件路径

	//打开文件夹中的文件
	OpenFile = QFileDialog::getOpenFileName(this,
		"",
		"",
		"(*.txt);;All(*.*)");

	//显示路径
	QFileInfo OpenFileInfo;
	OpenFileInfo = QFileInfo(OpenFile);
	OpenFilePath = OpenFileInfo.path(); //路径