[Qgis-user] Accessing QGIS's log of errors? Issues with a WMS provider with QGIS 1.7.4 on MacOS X

Thu Apr 19 11:56:34 PDT 2012

Alexandre - I am sorry but I don't know anything about the WMS code in
Qgis nor how it should behave - hope someone else here can help you
out!

I did get the message, and the layers show up blank.

bonne chance,
Etienne

On Thu, Apr 19, 2012 at 9:35 AM, Alexandre Leroux
<alexandre.leroux at ec.gc.ca> wrote:
>
> Hi Etienne,
>
> Thanks a lot for the detailed followup! As a mere QGIS user, I don't feel
> comfortable to build it from source.
>
> In the log that you shared with us, I don't see any clue pointing to what
> could be the reason for the error. Did you get that
>        "Map request error : Response: ?PNG"
> dialog box? That's the error I get and trying to fix.
>
> While the WMS errors were recently improved
> (http://lists.osgeo.org/pipermail/qgis-commit/2011-April/006800.html ), this
> is still a cryptic error message from QGIS.
>
> Thanks for any further feedback!
>
> Alex
>
>
> Alexandre Leroux, M.Sc., ing.
> MSC Data Management Section /
> Section de gestion des données du SMC
> Canadian Meteorological Centre / Centre météorologique canadien
> Environment Canada / Environnement Canada
> alexandre.leroux at ec.gc.ca - (514) 421-5024
>
> On 04/18/12 14:26, Etienne Tourigny wrote:
>>
>> Alexandre.
>>
>> First thing to look at is the "Log Messages" panel, but in this case
>> it shows nothing.
>>
>> The proper way to see (very) verbose error output is to compile QGis
>> in "Debug" mode.
>> Basically you need to add the following option to cmake:
>> -DCMAKE_BUILD_TYPE=Debug
>>
>> More details at
>> http://hub.qgis.org/wiki/quantum-gis/Building_QGIS_with_CMake
>> For OSX specific info, see http://www.kyngchaos.com/macosx/index
>>
>> I am not sure if there are debug builds out there...
>>
>> Attached is the error log when adding a png layer from your server
>>
>> Here is the most relevant part:
>>
>> Debug: src/providers/wms/qgswmsprovider.cpp: 507: (draw) getmap:
>>
>> http://wms.weatheroffice.gc.ca/geomet/?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&BBOX=-179.000000,27.988827,-39.000000,80.000000&SRS=EPSG:4326&WIDTH=1024&HEIGHT=380&LAYERS=CAPA.6P_PR&STYLES=PRECIPCM&FORMAT=image/png&DPI=96&TRANSPARENT=TRUE
>> Debug: src/core/qgsnetworkaccessmanager.cpp: 61: (queryProxy) using
>> user proxy for
>> http://wms.weatheroffice.gc.ca/geomet/?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&BBOX=-179.000000,27.988827,-39.000000,80.000000&SRS=EPSG:4326&WIDTH=1024&HEIGHT=380&LAYERS=CAPA.6P_PR&STYLES=PRECIPCM&FORMAT=image/png&DPI=96&TRANSPARENT=TRUE
>> Debug: src/providers/wms/qgswmsprovider.cpp: 710: (readBlock) image
>> height = 380 bytesPerLine = 4096
>> Debug: src/core/raster/qgsrasterlayer.cpp: 4813: (createNextPartImage)
>> Entered
>> Debug: src/core/raster/qgsrasterlayer.cpp: 4840: (createNextPartImage)
>> mCurrentPartRasterMin = 0
>> Debug: src/core/raster/qgsrasterlayer.cpp: 4841: (createNextPartImage)
>> imageX = 25 imageY = 242
>> Debug: src/core/raster/qgsrasterlayer.cpp: 4852: (createNextPartImage)
>> mCurrentPartRasterMax = 380 mViewPort->drawableAreaYDim = 380
>> Debug: src/core/raster/qgsrasterlayer.cpp: 959: (draw) raster draw
>> time (ms): 207
>> Debug: src/core/raster/qgsrasterlayer.cpp: 794: (draw) exiting.
>> Debug: src/core/qgsmaprenderer.cpp: 514: (render) Layer rendered without
>> issues
>> Debug: src/core/qgsmaprenderer.cpp: 554: (render) Done rendering map
>> layers
>> Debug: src/core/qgspallabeling.cpp: 1108: (drawLabeling) LABELING
>> work:  0 ms ... labels# 0
>> Debug: src/core/qgspallabeling.cpp: 1231: (drawLabeling) LABELING draw:  0
>> ms
>> Debug: src/core/qgsmaprenderer.cpp: 632: (render) Rendering completed
>> in (seconds): 0.224
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 608 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 1632 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 2656 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 3680 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 4704 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 5728 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 7776 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 9824 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 10848 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 1098:
>> (cacheReplyProgress) 11382 of 11382 bytes of map downloaded.
>> Debug: src/providers/wms/qgswmsprovider.cpp: 911: (cacheReplyFinished)
>> contentType: IMAGE/PNG
>> Debug: src/app/qgscustomization.cpp: 778: (customizeWidget) objectName
>> = QgsMessageViewer event type = 17
>> Debug: src/app/qgscustomization.cpp: 780: (customizeWidget)
>> QgsMessageViewer x QDialog
>>
>> Etienne
>>
>>
>> On Wed, Apr 18, 2012 at 10:10 AM, Alexandre Leroux
>> <alexandre.leroux at ec.gc.ca>  wrote:
>>>
>>>
>>> Hi list!
>>>
>>> I'm getting an error message when trying to display a WMS layer from a
>>> specific provider with QGIS 1.7.4 on MacOS X. The GetCapabilities works
>>> fine
>>> but when adding a layer, I get a cryptic short error message with
>>> "PNG???"
>>> or "JPEG???".
>>>
>>> My question: is there any way I can access QGIS verbose error logs?
>>>
>>> I'd like to understand (and thus fix) what's wrong. I suspect it's our
>>> WMS
>>> server that is not behaving correctly, but it does work with several
>>> other
>>> software such as OpenLayers, ArcGIS, MapInfo, etc. So far, only QGIS on
>>> MacOS X fails (it appears to work fine on QGIS on Windows) to load WMS
>>> layers from this server (other WMS servers appear to work fine in the
>>> MacOS
>>> X version of QGIS).
>>>
>>> For those curious to test, here's the WMS server:
>>>
>>> http://wms.weatheroffice.gc.ca/geomet/?service=WMS&request=getCapabilities
>>>
>>> It's on WeatherOffice, one of the most visited websites in Canada (don't
>>> we
>>> all like to know how to dress in the morning ;-) and I'd like to direct
>>> users of our WMS to QGIS in the official documentation, but I first need
>>> QGIS to work fine with our WMS server!
>>>
>>> Thanks for any feedback -
>>>
>>> Alex - Slashgeo.org
>>> --
>>> Alexandre Leroux, M.Sc., ing.
>>> MSC Data Management Section /
>>> Section de gestion des données du SMC
>>> Canadian Meteorological Centre / Centre météorologique canadien
>>> Environment Canada / Environnement Canada
>>> alexandre.leroux at ec.gc.ca - (514) 421-5024
>>> _______________________________________________
>>> Qgis-user mailing list
>>> Qgis-user at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-user