我在Google上搜索了set default filename qfiledialog，并在整个讨论中发生了.

I searched google for set default filename qfiledialog and happened across this discussion.

我发现只有在文件确实存在的情况下，使用 selectFile("myFileName"); 才有效.就我而言，目的是创建一个新文件，并可以选择覆盖现有文件.

I have found that using selectFile("myFileName"); only works if the file actually exists. In my case, the intent is to create a new file with the option of overwriting an existing file.

对我来说有效的解决方案(Qt 5.3.2)如下:

The solution that worked for me (Qt 5.3.2) was as follows:

QFileDialog svDlg;

QString saveFileName = svDlg.getSaveFileName(this, caption, preferredName, filter);

在上面的示例中，preferredName是一个QString，其中包含"C:/pre-selected-name.txt"

In the above example, preferredName is a QString that contains "C:/pre-selected-name.txt"

希望有帮助