[Qgis-user] QGIS 1.6 project causing 1.7 to crash

[Purves Ross]

Hi Nathan,

OK - even more strange. This string does not appear in my project file at
all. I checked in a text editor and grepped to be absolutely sure.

On 11 October 2011 14:20, Nathan Woodrow <madmanwoo at gmail.com> wrote:

> Can you search the xml in the project file for VectorBackgroundMapMarch2011
> and post each line it is mentioned on.  The only time QGIS will throw the
> Data Source is invaild error is in the ogr provider and somehow it is trying
> to load your project as a layer which it then bombs on.
>
> - Nathan
>
> On Tue, Oct 11, 2011 at 11:10 PM, Nathan Woodrow <madmanwoo at gmail.com>wrote:
>
>> Very strange indeed.
>>
>> - Nathan
>>
>>
>> On Tue, Oct 11, 2011 at 10:59 PM, Purves Ross <rmpurves at ntlworld.com>wrote:
>>
>>> OK, thanks for the tip re file number! Fingers crossed it's not that
>>> though.
>>>
>>> Sorry - now I get you. You mean can I load the layer called
>>> 'VectorBackgroundMapMarch2011' in its own right into a fresh project, right?
>>> Here's the rub - and also why I was confused by your question - there's no
>>> apparent layer with that name in the project! That's the name of the overall
>>> .qgs file, not a layer within it. Seems strange?
>>>
>>> Many thanks!
>>> Ross
>>>
>>>
>>>
>>>
>>> On 11 October 2011 13:53, Nathan Woodrow <madmanwoo at gmail.com> wrote:
>>>
>>>> I recall hearing about a bug where layers fail to load if there is a
>>>> certain number of files in the project but this might be something
>>>> unrelated.
>>>>
>>>> I mean can you load /mnt/bunker/ross/Research/PhD/NewMapMarch2011/VectorBackgroundMapMarch2011
>>>> in QGIS on it's own in a fresh project.
>>>>
>>>> - Nathan
>>>>
>>>> On Tue, Oct 11, 2011 at 10:51 PM, Purves Ross <rmpurves at ntlworld.com>wrote:
>>>>
>>>>> Hi Nathan,
>>>>>
>>>>> OK - by counting the number of occurances of '<maplayer' in the project
>>>>> file, I count 50 layers. Sounds a lot but there were no problems in 1.6 with
>>>>> this number!
>>>>>
>>>>> Sorry to be stupid, not sure what you mean by load the file by itself.
>>>>> Are you saying that there is a way of selectively loading layers on opening
>>>>> a QGIS project file? Or do you mean opening the file in a text editor or
>>>>> something. If the latter, then it certainly loads the XML OK and there's no
>>>>> evidence that the file is corrupted.
>>>>>
>>>>> Thanks again for the help!
>>>>> Cheers
>>>>> Ross
>>>>>
>>>>>
>>>>> On 11 October 2011 13:44, Nathan Woodrow <madmanwoo at gmail.com> wrote:
>>>>>
>>>>>> How many layers do you have in this project file?  And can you load
>>>>>> the file by itself?
>>>>>>
>>>>>> - Nathan
>>>>>>
>>>>>>
>>>>>> On Tue, Oct 11, 2011 at 10:35 PM, Ross Purves <RMP at lutonsfc.ac.uk>wrote:
>>>>>>
>>>>>>> Hi Nathan,
>>>>>>>
>>>>>>> Very many thanks for the quick response! OK, running from the command
>>>>>>> line gives me slight more info, to be sure:
>>>>>>>
>>>>>>> [Tue Oct 11 13:34:26 RMPT43:NewMapMarch2011 ]$ qgis
>>>>>>> VectorBackgroundMapMarch2011
>>>>>>> Warning: loading of qgis translation failed
>>>>>>> [/usr/share/qgis/i18n//qgis_en_GB]
>>>>>>> Warning: loading of qt translation failed
>>>>>>> [/usr/share/qt4/translations/qt_en_GB]
>>>>>>> Warning: Couldn't load Python support library: Cannot load library
>>>>>>> /usr/lib/qgispython: (/usr/lib/libqgispython.so: cannot open shared object
>>>>>>> file: No such file or directory)
>>>>>>> Critical: Data source is invalid
>>>>>>> Critical:
>>>>>>>
>>>>>>> Additionally, when I start QGIS this way I get a pop up window within
>>>>>>> the graphical interface that says:
>>>>>>>
>>>>>>> The layer
>>>>>>> /mnt/bunker/ross/Research/PhD/NewMapMarch2011/VectorBackgroundMapMarch2011
>>>>>>> is not a valid layer and can not be added to the map
>>>>>>>
>>>>>>> The strange thing is that I'm pretty certain there is no problem with
>>>>>>> the project file. It's timestamp reads 22 April, when I last worked on it.
>>>>>>> I.e. the version of QGIS has changed but my file has remained constant.
>>>>>>>
>>>>>>> Many thanks!
>>>>>>> Ross
>>>>>>> ________________________________________
>>>>>>> From: Nathan Woodrow [madmanwoo at gmail.com]
>>>>>>> Sent: 11 October 2011 13:26
>>>>>>> To: Purves Ross
>>>>>>> Cc: qgis-user at lists.osgeo.org
>>>>>>> Subject: Re: [Qgis-user] QGIS 1.6 project causing 1.7 to crash
>>>>>>>
>>>>>>> Hi Ross,
>>>>>>>
>>>>>>> That sounds a bit strange.  Can you start QGIS from the terminal and
>>>>>>> see what the output is when it locks up.
>>>>>>>
>>>>>>> - Nathan
>>>>>>>
>>>>>>> On Tue, Oct 11, 2011 at 10:19 PM, Purves Ross <rmpurves at ntlworld.com
>>>>>>> <mailto:rmpurves at ntlworld.com>> wrote:
>>>>>>> Hi there,
>>>>>>>
>>>>>>> I've updated my Ubuntu 10.10 installation to use QGIS 1.7. I put a
>>>>>>> lot of work into a project using QGIS 1.6 but it won't open in 1.7. The
>>>>>>> layers all appear but then the screen freezes as though QGIS is rendering
>>>>>>> the resulting map forever.
>>>>>>>
>>>>>>> A bit of googling revealed that there was a bug at some point which
>>>>>>> required the placement of 'gdal' between all <provider></provider> tags in
>>>>>>> the project XML file in a scenario like this. However, I tried this and it
>>>>>>> didn't work. I also have read various posts that say the use of 'on the fly'
>>>>>>> project appeared to cause problems going between 1.6 and 1.7. The project in
>>>>>>> question does indeed use on the fly projection.
>>>>>>>
>>>>>>> As a final note, I have an ECW raster layer in this map that requires
>>>>>>> the modified GDAL to work. I thought that the crash might be to do with the
>>>>>>> upgrade having removed my modified version of GDAL. I therefore recompiled
>>>>>>> it all and have checked to see that my version of 1.7 can now read ECW files
>>>>>>> and it can (when they are presented a a fresh layer and not as part of the
>>>>>>> problematic project).
>>>>>>>
>>>>>>> This is a really, really important project to me and I do need to get
>>>>>>> it back if at all possible. Please can anyone help?
>>>>>>>
>>>>>>> Very many thanks!
>>>>>>> Ross Purves
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Qgis-user mailing list
>>>>>>> Qgis-user at lists.osgeo.org<mailto:Qgis-user at lists.osgeo.org>
>>>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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