[Qgis-user] Resolved: new python plugin does not show up

Richard Duivenvoorde rdmailings at duif.net
Sun Feb 3 05:57:52 EST 2008

Hi Tara,

the link for pscyopg I sent you were apparently linux builds (I had this 
already installed).
Psycopg and psycopg2 are actually Python libraries for connecting to 
Postgresql/postgis databases via python. So IF you ever want to let your 
python plugin do something against postgresql, you will need it anyway :-)
I found windows builds here:

The raster plugin is a nice example for taking of with a simple plugin, 
when you need some 'config interface', you can use martin's copyright 
plugin (http://blog.qgis.org/?q=node/59) as a starting point.

Have fun.

Richard Duivenvoorde

Tara Athan wrote:
> I do not have psycopg, but otherwise following your advice I got the 
> plugin to the point where it would attempt to compile and produce the 
> "no psycopg" error.  Since psycopg is not included with the QGIS windows 
> build, perhaps a plugin example that doesn't depend on this would be 
> better for the manual.  I downloaded the psycopg library, but their 
> website is down and there is no installation notes so I wasn't sure how 
> to incorporate it.  Its not that important as I was just trying to 
> follow the example, but it could definitely throw off a novice trying to 
> follow the manual.  I did get the raster info plugin working, so I guess 
> I'm ready to  dive into the qgis API and build something new!
> Thanks for your help.
> Tara
> Richard Duivenvoorde wrote:
>> Hi Tara,
>> the good news: you (almost) succeeded. Here is your stuff back (I 
>> upgraded it to version 0.11 :-)
>> 1) don't put python plugins in the directory:
>> C:\Program Files\Quantum GIS_091\share\qgis\python\plugins\
>> You are right, that's where the plugin installer is (which is I would 
>> say still beta (aka not yet working the way it is supposed to yet).
>> But put your files in a directory new_layer here:
>> C:\Program Files\Quantum GIS_091\python\plugins\new_layer
>> There (after some fixes...) it works!!
>> 2) python is very picky with whitespaces! you will see error messages 
>> when you put your old plugin code in the right place ;-)
>> I removed them, or changed them (see new zip)
>> 3) remove the linenumbers in your newlayer.py
>> 4) you're including the python library pscopg (needed for python to 
>> interact with Postgresql. Do you have that lib installed in your 
>> python installation? I did'nt, and got errormessages, so I changed the 
>> version to psycopg2 (a library I do have). You should use/have one of 
>> those installed.
>> 5) your button did't show up in the buttonbar, but the plugin shows up 
>> in the pluginmanager! This is because the name you define in the 
>> resources.qrc should match the name you use for it in your code:
>> /plugins/new_layer/new_layer_icon.png
>> in the qrc file should match the name you use in your code:
>> self.action = QAction(QIcon(":/plugins/new_layer/new_layer_icon.png"),
>> After fixing this, it's loading.
>> So I would say, congrat with your first plugin!
>> Read something about python's whitespaces here: 
>> http://www.python.org/doc/essays/styleguide.html
>> here http://docs.python.org/ or http://docs.python.org/tut/tut.html
>> psycopg or psycopg2 can be downloaded here:
>> http://www.initd.org/pub/software/psycopg/
>> If you need an even easier plugin to start with, start with this one 
>> here:
>> http://blog.qgis.org/?q=node/104
>> Good luck
>> Richard Duivenvoorde
>> attached some screendumps to prove your plugin is loaded (0.9.1 on 
>> WinXP), and the code cleaned up a little and 'loadable' (all in the zip)
>> Tara Athan wrote:
>>> answers embedded. Thanks for the help - Tara
>>> Richard Duivenvoorde wrote:
>>>> Hi Tara,
>>>> where did you put you plugin stuff?
>>> C:\Program Files\Quantum GIS_091\share\qgis\python\plugins\new_layer
>>> This is the same folder that contains the plugin plugin_installer, 
>>> which does appear in my Plugin Manager
>>> (and works when installed, except there is an error when I tried to 
>>> download something- concerning permissions.
>>> Perhaps there is something wrong with the permissions of the folder 
>>> new_layer?
>>> Another Windows system thing I am not very familiar with.)
>>>> which files did you put there?
>>> __init__.py
>>> new_layer_icon.png
>>> newlayer.py
>>> resources.py
>>> resources.qrc
>>> I copied the names from Explorer to make sure these are the exact names
>>>> Can you reply to this mail with the exact paths you are put your files?
>>>> As an example, my plugin is here (I installed qgis in 
>>>> C:\programs\QGIS091):
>>>> C:\programs\QGIS091\python\plugins\imagemap_plugin
>>>> Maybe you can also sent me the files? I can look into them if you want.
>>> files attached in zip
>>>> Didn't you see an error-message dialog?
>>> No, no error message.
>>>> Regards Richard Duivenvoorde
>>>> Tara Athan wrote:
>>>>> I have  now made it through all the steps in the manual (Section 
>>>>> 11, subsection 7) for Using the Python Plugin.
>>>>> However the NewLayer plugin does not appear in the PlugIn Manager.
>>>>> I see a similar post on the Plugin forum (Developer>Plugins August, 
>>>>> 2007) but there were no replies.
>>>>> Version 0.9.0, 0.9.1 (I tried it in both)
>>>>> Platform WIndows XP SP2
>>>>> Thanks, Tara

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