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

Tue Oct 11 06:56:45 PDT 2011

Very many thanks indeed! Really appreciate the support!
Cheers
Ross

On 11 October 2011 14:53, Nathan Woodrow <madmanwoo at gmail.com> wrote:

> I can't say it's best practice but I have done it before.  You will need
> remove the legendlayer and use the layerid= to find any links to that legend
> item ie maplayer.  You will also need to change the "projectlayers
> layercount="83""
>
> I have cc'd this to the developer mailing list in case someone on there
> knows something that might help, before you start hacking away at things.
>
> - Nathan
>
>
> On Tue, Oct 11, 2011 at 11:48 PM, Purves Ross <rmpurves at ntlworld.com>wrote:
>
>> Great suggestion. Thank you. I'm guessing you mean manually remove a whole
>> <maplayer> tag at a time and reduce the total layers count in the XML file,
>> right? Is the XML project file structure robust enough to allow me to
>> manually 'hack' the file like this?
>>
>> Thanks again!
>> Cheers
>> Ross
>>
>>
>>
>> On 11 October 2011 14:45, Nathan Woodrow <madmanwoo at gmail.com> wrote:
>>
>>> Very strange.  The only thing I can think of at this time is take a
>>> backup of your project and remove each layer one by one resaving and opening
>>> the project each time to see if taking one out loads.
>>>
>>> See how you go with that.
>>>
>>> - Nathan
>>>
>>>
>>> On Tue, Oct 11, 2011 at 11:33 PM, Purves Ross <rmpurves at ntlworld.com>wrote:
>>>
>>>> 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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