[gdal-dev] RasterIO vs progress bar

Tamas Szekeres szekerest at gmail.com
Fri Feb 6 09:25:18 EST 2009


There have been an effort to provide such kind of options in GDAL RFC 24 (
for the drivers involved in slow IO operations an possibly in use of
multiple threads in this regards.
I guess it might be a bit unrelated to this issue but just in case.

Best regards,


2009/2/5 Oliver Eichler <oliver.eichler at gmx.de>

> Hi,
> Is there a way to get a progress when using RasterIO? Guess not ;) But it
> would be quite nice to have. Usually RatserIO is really fast, so you don't
> need it, but if you play with WMS access a feedback would be _really_ nice.
> I know API changes suck. But is there any chance in future to pass a
> callback
> function pointer and a void pointer to RasterIO. The callback function will
> receive the progress and the void pointer. That should make C and C++ lads
> happy. A way to abort transaction would be nice, too.
> I would really like to press on this topic, because I thing RasterIO is
> pretty
> neat and fast. I can get WMS access with just a few lines and it's quite
> the
> same as handling a file. I really appreciate that, however  without visual
> feedback on the download progress the normal user will get frustrated. And
> that would force me to re-implement all the magic.
> How is the chance to get this into GDAL?
> Oliver
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