qwt plugin not showing in Visual Studio QT toolbox

**MrGarbage** · 29th March 2007, 16:34

I am trying to make the QWT designer plugin part of my Visual Studio environment.
I successfully built a release build of the qwt designer.
I copied all of the qwt_designer_plugin.* files to my
C:\Qt\4.2.1\plugins\designer directory.

Now when I load my project and open a .ui file I still see only the standard
QT Toolbox.

In addition, now when I close my Visual Studio project I get a "Microsoft Visual Studio
has encountered a problem and needs to close" popup. I only see this if I do something
that invokes the designer.

Running QT designer in standalone mode fails to show the QWT plug in as well.

Any suggestions?

Commercial QT 4.2.1 on Windows XP.

**jacek** · 29th March 2007, 20:10

That plugin might depend on some other DLLs (you can verify this with Dependency Walker). In such case you have to copy those DLLs to a directory in which windows will look them (for example the same one where Qt DLLs are or c:\windows\system).

**Uwe** · 30th March 2007, 07:28

Qwt doesn't need any library beside Qt, but maybe the Qwt library itself is not in the PATH.

Uwe

**MrGarbage** · 30th March 2007, 15:16

I verified that qwt libs etc are in my path. Concentrating on just the QT Designer standalone app, that fails to show the qwt plugin as well. I ran dependency walker on it and it doesn't show any attempt to load anything that looks qwt related. Only msjava.dll is missing but I don't think that one matters.. I don't have it on my machine anyway.

Any suggestions?

**Uwe** · 30th March 2007, 16:01

Try to enable some debug messages from Qt.

Don't know if it is the same with Qt/Windows, but AFAIR on X11 there is a QT_DEBUG_PLUGINS environment variable that helps.

Uwe

**jacek** · 30th March 2007, 18:46

Make sure that both the plugin and the library were built in the release mode. You can also try to clean the plugin cache (HKCU\Software\Trolltech\OrganizationDefaults\Qt Plugin Cache 4.2.false).