I would prefer

Thanks Franzk,

I didn’t have to try it because it wasn’t crashing anymore.
The only difference was that this time there was a file inside the folder.

So it is crashing when the folder is empty.

What kind of obscure bug is that?

Nasty…

I changed thread-title and first post.

This could be some Qt-Bug.

The obvious workaround is putting a file into that folder or checking if it’s empty beforehand.

A real solution would be better though.

Everything works for me (Qt 4.7.3/MinGW/Windows Vista)

At least the directory pointed to by applicationDirPath() should not be empty – your .exe lives there :-)

You got me :)

No, I’m looking in a subfolder of my application path.

It works for an empty path for me too, Explorer shows up.

If I give it a non-existent directory, nothing happens, no explorer shows up, no crash either.

It shows up for me too, just crashes in release-mode.

In debug-mode it shows up and doesn’t crash, but if I click again on the button (executes the code again) it crashes.

Since it crashes os OSX every time (even if the folder is non-empty) I filed a bug in JIRA:

http://bugreports.qt.nokia.com/browse/QTBUG-19378

The snippet from the bugreport works for me. Although, on Windows your path is wrong. These are the right calls:

You will hardly ever need native separators in Qt world.

In either case, I do not have crashes neither on windows nor on the mac.

Thanks for correcting me.

Since I use the pre-built SDK (not the obscure Frankenstein-Qt-build experiments from the other thread) I think it is worth a bugreport.
The funny thing is that the directory opens, then my application crashes. I added this detail to the Bugreport.

Volker’s code works fine for me on Qt 4.7.0, winXP. It seems your crash isn’t related to openUrl()?