QFileDialog: adding extension automatically when saving file?

Question

When using a QFileDialog to save a file and to specify the extension (like *.pdf) and the user types in a name without this extension, also the saved file hasn't this extension.
Example-Code:

QFileDialog fileDialog(this, "Choose file to save");
fileDialog.setNameFilter("PDF-Files (*.pdf)");
fileDialog.exec();
QFile pdfFile(fileDialog.selectedFiles().first());

now when the user enters "foo" as the name, the file will be saved as "foo", not as "foo.pdf". So the QFileDialog doesn't add the extension automatically. My question: How can I change this?

Answer 1

You could use QFileDialog::setDefaultSuffix() :

This property holds suffix added to the filename if no other suffix was specified.

This property specifies a string that will be added to the filename if it has no suffix already. The suffix is typically used to indicate the file type (eg "txt" indicates a text file).

Answer 2

For multiple file filters, the following can be done.

import re
import os

def saveFile(self):
    path, fileFilter = QFileDialog().getSaveFileName(self, "Save file", 
        "", "Gnuplot Files (*.plt)" 
        + ";;" + "Gnuplot Files (*.gp)"
        + ";;" + "Gnuplot Files (*.gpt)"
        + ";;" + "Text Files (*.txt)")

    selectedExt = re.search('\((.+?)\)',fileFilter).group(1).replace('*','')

    # Attach extension as per selected filter, 
    # if file does not have extension.
    if not os.path.splitext(path)[1]:
        path = path + selectedExt

    print(path)