Louis Solomon / SteelBytes
Problem ------- loading images from a custom istream using gdi+ functions works for all image types I tried, EXCEPT for PNG files !!! Cause ----- I was using a custom istream that implemented IUnknown, ISequentialStream, IStream. when loading the png, gdi+ was querying for a IImageBytes (defined in GdiplusImaging.h). why does the png loader section of gdi+ use this, and no other image loader ? ask MS :-) Solution -------- implement IImageBytes. note, since my istream was actually a section of memory mapped file, no fancy locking was required to implement LockBytes() & UnlockBytes().