QFileDialog: how to set default filename in “Save

问题:

I try to create "Save as..." dialog in Mac OS X. But I don't want to use QFileDialog::getSaveFileName() function, because dialog that created by this function is NOT truly-native in Mac OS X Lion. So I decide to create dialog as QFileDialog object:

auto export_dialog( new QFileDialog( main_window ) );
export_dialog->setWindowModality( Qt::WindowModal );
export_dialog->setFileMode( QFileDialog::AnyFile );
export_dialog->setAcceptMode( QFileDialog::AcceptSave );

All works fine, except one problem. I cannot set default name for saved file, so user must type this name manually every time. I know that function QFileDialog::getSaveFileName() allows to set default filename via third argument, dir (http://qt-project.org/doc/qt-4.8/qfiledialog.html#getSaveFileName). But how to set this default name without this function?

I can set default suffix for saved file via QFileDialog::setDefaultSuffix() function, but I need to set whole default name, not only default suffix.

I've tried to use QFileDialog::setDirectory() function, but it sets only directory where to save, without name of saved file.

I use Qt 4.8.1 on Mac OS X Lion.

Thanks in advance for your help.

回答1:

Restating what was in the comments for future visitors, the following line puts "myFileName" as the default name in the QFileDialog:

export_dialog->selectFile("myFileName");

Discussion: http://www.qtcentre.org/threads/49434-QFileDialog-set-default-name?highlight=QFileDialog

Not-so-helpful docs: http://qt-project.org/doc/qt-4.8/qfiledialog.html#selectFile

回答2:

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

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.

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

QFileDialog svDlg;

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

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

Hope that helps

回答3:

QString dir = QDir::homePath();
QString name = "test.txt";

QFileDialog::getSaveFileName(nullptr, tr("save file"), dir + "/" + name, tr("TXT (*.txt)"));

If you set "dir" argument, and dir is "file"(exist or not), in windows you will have default name.

回答4:

With the current QT-version (5.x) you can set your preffered file-name with the argument directory in the QFileDialog.getSaveFileName() function call:

QFileDialog.getSaveFileName( directory = 'prefferedFileName.txt' )

docs: http://doc.qt.io/qt-5/qfiledialog.html#getSaveFileName