Module stream Methods
ReadStream
ReadStream() makes the image pixels available to a user supplied callback method immediately upon reading a scanline with the ReadImage() method.
The format of the ReadStream() method is:
  Image *ReadStream(const ImageInfo *image_info,StreamHandler stream,
    ExceptionInfo *exception)
A description of each parameter follows:
image_info
the image info.
stream
a callback method.
exception
return any errors or warnings in this structure.
WriteStream
WriteStream() makes the image pixels available to a user supplied callback method immediately upon writing pixel data with the WriteImage() method.
The format of the WriteStream() method is:
  MagickBooleanType WriteStream(const ImageInfo *image_info,Image *,
    StreamHandler stream)
A description of each parameter follows:
image_info
the image info.
stream
A callback method.


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