[gdal-dev] [Windows] GDAL plug-ins are not found

[Paul Meems]

Getting back on our issue.
We've solved it now. It was a combination of design flaws at our end.

First we opened all GDAL datasets in update mode and if it failed we opened
it in read-only mode.
That's why we got the error but was the image still shown. We changed this
strategy.

Secondly we relied on the GDAL_DRIVER_PATH environment variable to find the
GDAL plug-ins.
We changed that by using CPLSetConfigOption on startup.

Now out test application is no longer reporting errors and our demo
application can also load ECW files.

Thanks,


Paul

*Paul Meems *
Release manager, configuration manager
and forum moderator of MapWindow GIS.
www.mapwindow.org

Owner of MapWindow.nl - Support for
Dutch speaking users.
www.mapwindow.nl



*The English presentations of the MapWindow GIS Conference 2014 are online.
<http://www.slideshare.net/mapwindow>*

2014-12-20 16:35 GMT+01:00 Paul Meems <bontepaarden at gmail.com>:

> Thanks Even for your quick reaction.
>
> I have indeed another error line, but because it was translated to Dutch I
> assumed it was not relevant.
> This is that line translated to English:
> 126: Cannot find the mentioned module
>
> When I use dependency walker on the gdal_ECW_JP2ECW.dll in my plug-ins
> folder I get errors about missing gdal200.dll, etc.
> When I copy the dll into the folder with gdal200.dll dependency walker has
> no problems.
> When I remove this dll again and copy gdalinfo.exe into this folder and
> use it on the ecw-file I get the expected meta data of the file.
> So it seems gdal is not the problem, right?
>
> Any suggestions what could be the problem?
>
> Thanks,
>
>
>
>
> Paul
>
> *Paul Meems *
> Release manager, configuration manager
> and forum moderator of MapWindow GIS.
> www.mapwindow.org
>
> Owner of MapWindow.nl - Support for
> Dutch speaking users.
> www.mapwindow.nl
>
>
>
> *The English presentations of the MapWindow GIS Conference 2014 are
> online. <http://www.slideshare.net/mapwindow>*
>
> 2014-12-20 16:09 GMT+01:00 Even Rouault <even.rouault at spatialys.com>:
>
>> Le samedi 20 décembre 2014 15:56:30, Paul Meems a écrit :
>> > With our ActiveX control (MapWinGIS) written in C++ we use GDAL v2.
>> > We use the pre-build binaries from GISInternals.com.
>> >
>> > We have two C# applications that use our ActiveX control. One does some
>> > testing and its executable is in the same folder as our ocx and the gdal
>> > dlls. This folder also has the gdalplugins folder with the ECW, MrSid en
>> > NetCDF plug-ins.
>> >
>> > When I open an ECW file in the testapplication I get this error:
>> > GDAL FAILURE: `[..]\ECW-ERMapper-Compressed-Wavelets.ecw' not
>> recognised as
>> > a supported file format. But we can open the file and it is shown
>> properly
>> > in our map.
>>
>> That's really surprising ! Almost a miracle, but I don't believe in
>> miracles.
>> The only explanation I can see is that there are 2 opening attempts, one
>> before calling GDALAllRegister() and the second one afterwards... What
>> would
>> be weird code... So that must be something else.
>>
>> >
>> > Our second C# application is a demo and has its executables in its own
>> > folder.
>> > I've set the GDAL_DRIVER_PATH env. variable to the gdalplugins folder.
>> > When I now open the ECW file in this application I get this error:
>> > GDAL FAILURE: Can't load requested DLL:
>> >
>> D:\dev\MapwinGIS\MapWinGIS\trunk\bin\Win32\gdalplugins\gdal_ECW_JP2ECW.dll
>>
>> There should be another line afterwards with an error code and an error
>> message, but perhaps your error handler "eats" that extra line.
>>
>> > But that is the location of the dll. I've double checked. Even the
>> casing
>> > is correct.
>>
>> Perhaps a dependency problem. Can the ECW SDK dll be reachable and/or in
>> the
>> path ?
>>
>> > I also get this warning: GDAL WARNING: Failed to open
>> > [..]\ECW-ERMapper-Compressed-Wavelets.ecw
>> >
>> > All GDAL binaries were downloaded yesterday, but I believe we had the
>> same
>> > issue with prior versions of GDALv2 as well. But because the test
>> > application did show the image we ignored it.
>> > But the demo is a bit more strict ;)
>> >
>> > Any suggestion is much appreciated.
>> >
>> > Thanks,
>> >
>> > Paul
>> >
>> > *Paul Meems *
>> > Release manager, configuration manager
>> > and forum moderator of MapWindow GIS.
>> > www.mapwindow.org
>> >
>> > Owner of MapWindow.nl - Support for
>> > Dutch speaking users.
>> > www.mapwindow.nl
>> >
>> >
>> >
>> > *The English presentations of the MapWindow GIS Conference 2014 are
>> online.
>> > <http://www.slideshare.net/mapwindow>*
>>
>> --
>> Spatialys - Geospatial professional services
>> http://www.spatialys.com
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20141221/4cb7f028/attachment.html>