Hi Thomas,


> But it is not working.
> First of all I found that using a WMS via a qmap the tiles will not
> stored in cache (If I load the map normal it is working).

Have a look at:

http://www.gdal.org/frmt_wms.html


Especially look at this:

<Cache> 
  <Path>./gdalwmscache</Path>
  <Depth>2</Depth>
  <Extension>.jpg</Extension>
</Cache>        

> Second, If I use GDAL_wms with <Transparent>TRUE</Transparent> the
> background is black.
> So I think there is a problem for the α-channel.

What is your binary format? Jpeg has no alpha channel. But with Png or Gif it 
should be possible.

HTH

Oliver

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