Re: [Openexr-devel] Read OpenEXR from memory data source ?

[Gernot Ziegler]

Hej Paul !

Thanks for your suggestions, but the problem lies in the fact that the
dummy filename is invalid. It is being checked for in IStream, if I got it
right, and IStream casts an exception, which makes it impossible for me to
use as a memsource.

As a workaround, I now write the file down to /tmp/dummy.exr and read it
from there again ... not very efficient, but it works at the moment ;)

> it sounds like the buffer you're passing doesn't contain valid EXR data
> - that error means that it tried to read the "magic number" from the
> beginning of the stream, and it wasn't the correct magic number.  See
> ImfHeader.cpp line 804 for where this error occurs.
>
> Where are you getting the stream from?  The bytes in your memory buffer
> should be identical to the bytes of an EXR file on disk.  Also, I think
> that the EXR library expects the input stream to be little-endian - you
> don't happen to be running this on a big-endian machine, do you?
The file is fine as I could read it with my own programs, with the
workaround, and it was generated by the OpenEXR plugin of 3DSMax.
And no, no big/little-endian issues, only x86-I/O (brrr, had that problem
in my self-hacked RPF reader, never big-endian again ;) )

Servus,
  Gernot

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