Threads in Designer plugins

[hvengel]

I have a designer plugin that I would like to add sound to and the sounds need to run in a separate time critical thread. I tested the code (paint event, sound thread) in a test app before migrating this to a plugin. For some reason I have to disable the thread code to get the plugin to load in designer. If I place the class declaration for the sounds QThread in the header file for the plugin designer gives me a segmentation fault. If I move the class declaration for the sounds QThread from the header file into the implementation file designer will open but the plugin does not show up and looking in Help -> About Plugins it says that it can't load the plugin because "undefined symbol: _ZTV10tickThread". I have declared tickThread as:

class tickThread : public QThread
{
    Q_OBJECT
 
public:
    virtual void run();
};

class tickThread : public QThread
{
    Q_OBJECT

public:
    virtual void run();
};

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I can't find anything on-line about using threads in a plugin other than some older Qt documentation that indicates that it was possible to do in Qt 3.x. Anyone know what needs to be done to use threads in designer 4.x plugins?

I guess I can always add the sound thread to the main application but I would like to understand why I am having issues with it in the plugin.

[wysota]

Did you implement a constructor for this class?

[hvengel]

Yes I do. It turns out that it was not threads that were causing the problem but rather that I was using phonon in the plugin to create sounds. After I made the phonon related bits conditional so that they would not be compiled as part of the plugin but would be build otherwise the plugin started working in designer.