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in a Qt dialog for saving a file, I have multiple options for file filters.

For instance, my filter is "Text Files (*.txt, *.pdf);;TXT Files (*.txt);;PDF files(*.pdf)".

This is my code:

QFileDialog dialog(this);
dialog.setFileMode(QFileDialog::AnyFile);
dialog.setNameFilter(filter.c_str());
dialog.setAcceptMode( QFileDialog::AcceptSave );
dialog.setWindowTitle(WINDOW_TITLE_EXPORT_CLOUD);
if (!dialog.exec())
    return;

QString fileName;
auto    fileName = dialog.selectedFiles().at(0);

Now, the user may not introduce a file extension, so it should be the dialog's responsibility to force one based on the selected file filter.

For the case of multiple extensions, I could use QDialog::setDefaultSuffix(), but this would not suffice because if I set the default suffix to, for instance, .pdf, the user may select the TXT files (*.txt) filter, and I would override the user decision.

How can I force the file extension based on the selected filter?

Thank you

There is also the QFileDialod::selectedNameFilter(), but basing my code on this would force me to check for the existence of the file afterwards, for not overriding (Is there a way to automatically add extensions to a file using QFileDialog on Linux)

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manatttta
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1 Answers1

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You can only do it afterwards.

You can get the selectedNameFilter. Then you should check if the selected filename has the same extension as the selectedNameFilter.

If they are not the same, you can choose to add it, or change the extension.

RvdK
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