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Modify parameters of raw image

How can I modify parameters like "ISO speed","shutter ","timestamp".
For example : firstly, open a Raw file "test.CR2", then define LibRaw RawProcessor; i want to modify "shutter"of "test.CR2",my opinion is : RawProcessor.imagedata.other.shutter=8.9. But it does not work, the "test.CR2" file is not changed. how can i modify some parameters of RAW images.