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I am currently using the IWICImagingFactory api call CreateDecoderFromFilename which takes a file name to create a decoder. However, I have the file already loaded into an array and want to use that. Does anyone have any idea how to do that? The API seems a tiny bit obscure.
It sounds like you want to use
SHCreateMemStreamto create anIStreaminterface to your memory buffer, then useIWICImagingFactory::CreateDecoderFromStreamto create a decoder from that stream.