Undefined Reference error!!!

[zlatko]

In imageZoomer i have created a Q3CanvasView and have passed in the constructor of the CanvasMouse which reads this
CanvasMouse(Q3CanvasView *canview): canvasview(canview)

You sholdn't give Q3CanvasView parametr. You need give only pointer on parent class.

CanvasMouse *canmous = new CanvasMouse(this);
 
  *****
CanvasMouse(ImageZoomer*p): canvasview(p)
{
}

CanvasMouse *canmous = new CanvasMouse(this);

  *****
CanvasMouse(ImageZoomer*p): canvasview(p)
{
}

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p.s. also you could give any parametres (if you dont need it in future )