[vtkusers] HELP !!! How To Save The Result Of vtkImageTracerWidget ???

[JohnMark]

Hi , 
   I compiled the example of vtkImageTracerWidget in VC++ 6.0 : TestImageTracerWidget . and it works very well . I can get any regions of the picture . but I want to save the result , my code is as follows :vtkImageCast * readerImageCast1 = vtkImageCast::New();    // its data from the output of vtkImageStencil    readerImageCast1->SetInput((vtkDataObject *)stencil->GetOutput());     readerImageCast1->SetOutputScalarTypeToUnsignedChar();vtkBMPWriter * bmp = vtkBMPWriter::New();    bmp->SetInput(readerImageCast1->GetOutput());    bmp->SetFileName("C:/test.bmp");        bmp->Write(); // problem !!!! it does not work any more !        bmp->Update();    I use vtkImageCast to change the image type before I save the result . but what I get is just a black line ( even though I use the Update() method ), I want save the result within a spline after I draw the spline on the picture .maybe many writer classes , like vtkBMPWriter , couldn't save the dynamic result . because I think the widget result is dynamic . but what can I do if I want to get the result like so ?    waiting for your answer and thank you very much !      Mark
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