[Gdal-dev] no file

[mjollnir]

You can run the PNG encoder to a memory buffer "virtual file" using the
mechanism described at:

   http://www.gdal.org/cpl__vsi_8h.html#66e2e6f093fd42f8a941b962d4c8a19e

Then you would send the contents of the memory buffer off to the socket.

In theory you could also write a special file handler allowing you to
stream it directly to the socket without an intermediate memory buffer but
that would be very involved.

I like the second idea, would you please give me a clue
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