How can I show only certain file extensions in an open file dialog?

Question

When I open a folder with OpenDialog, how can I filter it so that users can see only certain files (for example, Stringgrid, * .sg), and files with any other extension do not appear in the dialog box?

Answer 1

Set the OpenDialog.Filter property to the filter for the filter. You can do this in the Object Inspector; click in the Filter property and you will see a small button on the right edge with ... Click this and you will see a dialog box. The left side is the file description (for example, Excel files (*.xls) ). The right side is the filter you want to use, as in *.xls .

You can also set it in code before displaying a dialog:

 OpenDialog1.Filter := `Excel files (*.xls)|*.xls`; 

Of course, replace the Excel material with any description and mask that you want to use.

Answer 2

The Filter and FilterIndex properties are used to specify the file extension (s) (note that the user can manually override the filter).

The OnIncludeItem event OnIncludeItem used to selectively enable / disable individual files / folders from the list in the dialog box.