This is a user callback interface that should be implemented and registered using ILTStlImgWrt::SaveOptionsCallback.
This method is called by the filter for each frame.
String containing the new output file name for the current frame. If you do not want to change the output filename, pass NULL.
Flag that indicates how the callback should handle the frame.
Contains the current passed frame index.
If the value is VARIANT_TRUE, then the output file is a multipage file. If the value is VARIANT_FALSE, then the output file is not a multipage file.
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