CvConnectedComp.contour is NULL with cvFloodFill

I am trying to use CvConnectedComp which is an output from cvFloodFill.

CvConnectedComp comp;
cvFloodFill(imgInput,seedPoint,
        cvScalarAll(0),cvScalarAll(.1),cvScalarAll(1.),
        &comp,CV_FLOODFILL_MASK_ONLY,imgMask);

I am able to use comp.rect for drawing the component, but comp.contour is NULL.I want to use it for further processing. I tried without mask also, but still it is same result.

Any idea will be appreciated.


Source: c#

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