[Qt Bug reported] App crashes on QDesktopServices::openUrl(QUrl("file:///C://folder)); if folder is empty

[Hedge]

For some reasons my application crashes when I execute the following line.

@QDesktopServices::openUrl(QUrl("file:///" + QApplication::applicationDirPath()));@

EDIT: It only crashes when the target folder is empty.

[Franzk]

I would prefer @QDesktopServices::openUrl(QUrl::fromLocalFile(QApplication::applicationDirPath()));@ but I'm not sure if that will prevent the crash.

[Hedge]

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?

[Franzk]

Nasty...

[Hedge]

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.

[goetz]

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 :-)

[Hedge]

You got me :)

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

[goetz]

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.

[Hedge]

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.

[Hedge]

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

[goetz]

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

@
QString path = QApplication::applicationDirPath() + "/somefolder";
QDesktopServices::openUrl(QUrl::fromLocalFile(path));
@

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.

[Hedge]

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.

[Franzk]

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