如何在QFileDialog上设置选定的过滤器？ [英] How to set selected filter on QFileDialog?

问题描述

我有一个打开的文件对话框，有三个过滤器：

I have a open file dialog with three filters:

QString fileName = QFileDialog::getOpenFileName(
        this,
        title,
        directory,
        tr("JPEG (*.jpg *.jpeg);; TIFF (*.tif);; All files (*.*)")
);

这将显示一个对话框，其中选择JPEG作为默认过滤器。我想把过滤器列表按字母顺序排列，所以所有文件是列表中的第一个。如果我这样做，然而，所有文件是默认选择的过滤器，我不想要的。

This displays a dialog with "JPEG" selected as the default filter. I wanted to put the filter list in alphabetical order so "All files" was first in the list. If I do this however, "All files" is the default selected filter - which I don't want.

我可以设置默认选择过滤器，

Can I set the default selected filter for this dialog or do I have to go with the first specified filter?

我尝试指定第五个参数（ QString ）来设置默认选择过滤器，但这没有工作。我认为这可能只用于检索由用户设置的过滤器。

I tried specifying a 5th argument (QString) to set the default selected filter but this didn't work. I think this might only be used to retrieve the filter that was set by the user.

推荐答案

Like this:

QString selfilter = tr("JPEG (*.jpg *.jpeg)");
QString fileName = QFileDialog::getOpenFileName(
        this,
        title,
        directory,
        tr("All files (*.*);;JPEG (*.jpg *.jpeg);;TIFF (*.tif)" ),
        &selfilter 
);

我同意文档：

http://doc.qt.digia.com/3.3/qfiledialog.html#getOpenFileName

is abit对这一点不清楚，但它只花了我一个尝试猜测如何做到这一点。

I concur that the docs:
http://doc.qt.digia.com/3.3/qfiledialog.html#getOpenFileName
are abit vague about this point but it only took me one try to guess how to do this right.

这是一个案件，它是更快，只是试一试， 。

This is one case where it's faster to just try it than to ask a question.

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