Create ECW plugin for gdal-1.9

[jpalmer]

Really useful for QGIS users

[warmerdam]

I will try to prepare it this weekend. I will update the ticket when it is ready for testing.

[warmerdam]

I have packaged gdal-ecw-1.9.0-0 and now it should be possible to use it with GDAL on OSGeo4W per instructions in http://trac.osgeo.org/osgeo4w/wiki/pkg-gdal-ecw

+jef

I see it does not currently work because the qgis.bat evilly sets GDAL_DRIVER_PATH. If this needs to be set it should be delgated to the gdal.bat file and anyways it is not supposed to include the version subdirectory. This completely defeats the ability of GDAL to pick up only the dlls of the proper version.

[jef]

Replying to warmerdam:

I see it does not currently work because the qgis.bat evilly sets GDAL_DRIVER_PATH. If this needs to be set it should be delgated to the gdal.bat file and anyways it is not supposed to include the version subdirectory. This completely defeats the ability of GDAL to pick up only the dlls of the proper version.

fixed in qgis and qgis-dev

[avlisad]

Since different versions of QGis and gdal(lib) can coexist and only QGis needs GDAL_DRIVER_PATH to be set in order to find gdal plugins, that variable must be set in qgis.bat and qgis-dev.bat to %OSGEO4W_ROOT%\bin\gdalplugins\@GDAL_VERSION@, where @GDAL_VERSION@ is the version of gdal used to build QGis.

[jef]

Replying to avlisad:

Since different versions of QGis and gdal(lib) can coexist and only QGis needs GDAL_DRIVER_PATH to be set in order to find gdal plugins, that variable must be set in qgis.bat and qgis-dev.bat to %OSGEO4W_ROOT%\bin\gdalplugins\@GDAL_VERSION@, where @GDAL_VERSION@ is the version of gdal used to build QGis.

What's your point? QGIS is built with 1.9 (but yes, the entry was still from when GDAL 1.7 was the default GDAL in OSGeo4W and QGIS was build with 1.8).

[jef]

Replying to jef:

Replying to warmerdam:

I see it does not currently work because the qgis.bat evilly sets GDAL_DRIVER_PATH. If this needs to be set it should be delgated to the gdal.bat file and anyways it is not supposed to include the version subdirectory. This completely defeats the ability of GDAL to pick up only the dlls of the proper version.

fixed in qgis and qgis-dev

Actually that didn't fix it. GDAL retrieves the path of the calling .exe which apps/qgis(-dev)/qgis.exe for QGIS. So GDAL search in in apps/qgis(-dev)/bin/gdalplugins. The batch files now set GDAL_DRIVER_PATH to 1.9, but that could also be fixed in etc/ini/gdal.bat.

[warmerdam]

right - the correct fix is for gdal's ini .bat to set this. I will correct.

[andreaerdna]

Replying to warmerdam:

I have packaged gdal-ecw-1.9.0-0

is the OSGeo4W gdal-ecw-1.9.0-0 package compiled against 4.2 ERDAS ECW RO SDK or 4.1? gdalinfo --formats now reports "ECW (rov): ERDAS Compressed Wavelets (SDK 4.2)": is it correct? In this case I think we have to update http://trac.osgeo.org/osgeo4w/wiki/pkg-gdal-ecw and create http://trac.osgeo.org/osgeo4w/wiki/pkg-gdal18-ecw and probably also a gdal18-ecw package. However, it seems to work either with 4.1 SDK DLLs or 4.2 SDK DLLs.

[warmerdam]

I thought I had done it with the 4.1 but I'll review tonight.

[warmerdam]

gdal.bat has been updated to set GDAL_DRIVER_PATH in the gdal package.

While I recorded the ECW SDK as being 4.1 when I dig into the include file version it records 4.2.1. I don't know if there was an error on my part or there's though I suspect mine.

So it seems it is really 4.2 though I'm pleased to hear the 4.1 DLLs also work.