c# - JpegBitmapDecoder decode jpeg failed? -

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i'm using following code decode jpge image

unmanagedmemorystream^ mstream = gcnew unmanagedmemorystream(_jpegdatabuff, _bufflength); jpegbitmapdecoder^ decoder = gcnew jpegbitmapdecoder(mstream, bitmapcreateoptions::preservepixelformat, bitmapcacheoption::onload); bitmapsource^ bitmapsource = decoder->frames[0];

i use bitmapsource display on control of wpf, the result below

enter image description here

i have searched on internet, did not solve yet!

someone can me?

many thanks,

t&t

from looks of either jpeg source incomplete or invalid. exceptions jpegbitmapdecoder throws argumentnullexception (stream null) , fileformatexception. file format detected analyzing file header. jif/jfif file structure holds image description information in relatively small header followed "raw" data.

i guess decoder built resilient ignore invalid (rendered last before gray) and/or missing (rendered gray) blocks. think way detect either analyze final image (maybe checking last 8x8px block doesn't have same color?) or source (maybe counting data blocks?).


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