CODEWITHSUNDEEP
c++qtmemory-managementopencv
Sam
Sam

Reputation: 864

How to deallocate memory when a Qt window closes?

I am currently creating a program in Qt, OpenCv, Mac os X. I have a main window, and then a separate window that is opened. I pass the new window several matrix clones in the constructor: 

ImageWindow *imageWin = new ImageWindow( 
   cvCloneMat(getData->getMasterRawMat(1)), 
   cvCloneMat(getData->getMasterRawMat(2)), 
   cvCloneMat(getData->getMasterRawMat(3)), 
   cvCloneMat(getData->getMasterRawMat(4)) );
imageWin->show();

How do I deallocate ( where do I call cvReleaseMat ), when the new window is closed?

Upvotes: 1

Views: 3148

Answers (2)

Paul
Paul

Reputation: 13238

Consider using RAII idiom and smart pointers and you won't need to remember when to release allocated memory.

Upvotes: 1

Ariya Hidayat
Ariya Hidayat

Reputation: 12561

You can do that in e.g. your closeEvent(). Alternatively, if you use Qt::WA_DeleteOnClose for your widget attributes, the widget will be deleted when it is closed, which means you can place some clean-up routines in the destructor.

Upvotes: 8

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