qt QFileDialog 设置默认路径和默认文件名，，mac

2013-07-08 01:33:43 2.7k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Qt文件对话框开发实战与性能优化指南文件对话框是GUI开发中的基础组件，其核心功能是建立用户与文件系统的安全交互通道。Qt框架通过QFileDialog类实现了跨平台的文件操作解决方案，采用MVC架构分离数据模型与界面呈现。在工程实践中，开发者需要掌握静态函数快速调用与对象式深度定制两种模式，特别要注意不同平台下的行为差异和性能优化技巧。通过合理使用文件过滤器、代理模型和异步加载等技术，可以显著提升大文件目录的操作效率。该技术广泛应用于医疗影像系统、电商后台等需要复杂文件交互的场景，结合Qt的跨平台特性，能有效降低开发维护成本。阅读详情

m_SaveFilepatth = QFiledialog::getSaveFileName(this,"save","/FAT/data_file");
这句话怎么修改。

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第二个参数是标题名称第三个参数是保存路径以及保存的名字。假如你要保存在/home下,保存名字为"config.dat": m_SaveFilepatth = QFiledialog::getSaveFileName(this,"save","/home/config.dat"); 帮助文档有更多的参数说明:


QString QFileDialog::getSaveFileName(QWidget * parent = 0, const QString & caption = QString(), const QString & dir = QString(), const QString & filter = QString(), QString * selectedFilter = 0, Options options = 0) [static]
This is a convenience static function that will return a file name selected by the user. The file does not have to exist.

It creates a modal file dialog with the given parent widget. If parent is not 0, the dialog will be shown centered over the parent widget.

QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"),
                           "/home/jana/untitled.png",
                           tr("Images (*.png *.xpm *.jpg)"));
The file dialog's working directory will be set to dir. If dir includes a file name, the file will be selected. Only files that match the filter are shown. The filter selected is set to selectedFilter. The parameters dir, selectedFilter, and filter may be empty strings. Multiple filters are separated with ';;'. For instance:

"Images (*.png *.xpm *.jpg);;Text files (*.txt);;XML files (*.xml)"
The options argument holds various options about how to run the dialog, see the QFileDialog::Option enum for more information on the flags you can pass.

The default filter can be chosen by setting selectedFilter to the desired value.

The dialog's caption is set to caption. If caption is not specified, a default caption will be used.

On Windows, and Mac OS X, this static function will use the native file dialog and not a QFileDialog.

On Windows the dialog will spin a blocking modal event loop that will not dispatch any QTimers, and if parent is not 0 then it will position the dialog just below the parent's title bar. On Mac OS X, with its native file dialog, the filter argument is ignored.

On Unix/X11, the normal behavior of the file dialog is to resolve and follow symlinks. For example, if /usr/tmp is a symlink to /var/tmp, the file dialog will change to /var/tmp after entering /usr/tmp. If options includes DontResolveSymlinks the file dialog will treat symlinks as regular directories.

Warning: Do not delete parent during the execution of the dialog. If you want to do this, you should create the dialog yourself using one of the QFileDialog constructors.

qt QFileDialog 设置默认路径和默认文件名，，mac

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