[QGIS-Developer] How to transfer data between QGIS Python plugins?

[Zac Wang]

Hi Etienne,

Yes, you're right. I mean Python code.

Others' suggestions solved my problem. But it's good to know that I can
call another plugin using the Processing package.

Thank you.


Cheers,

Zac

On Fri, 23 Apr 2021 at 13:08, Etienne Trimaille <etienne.trimaille at gmail.com>
wrote:

> It also depends what you mean by "transferring data". It seems that you
> mean Python code ? Not geospatial data ?
> If you mean Python code, you can also have a look at the Processing
> framework.
> https://docs.qgis.org/3.16/en/docs/user_manual/processing/index.html
> You can call Processing algorithm plugin A from plugin B by using
> "processing.run("plugin_a_provider:name_of_algorithm")".
>
> This will make you code available from the Processing graphical toolbox,
> Modeler, etc as well.
>
> Not recommended because others already gave the qgis.utils.plugins
> dictionary, but you can do "from plugin_a.xxxx import yyy" from you plugin
> B.
>
> Le ven. 23 avr. 2021 à 04:43, Tobias Schmetzer <tschmetzer at gmx.de> a
> écrit :
>
>> Hello Zac,
>>
>> I just saw you were helped and I'm happy the functionality solved your
>> problem!
>>
>> If you feel there's a lack of documentation and you've got an idea how to
>> improve it I think the best thing to do is to support this documentation
>> with a contribution. This is how I started when I realised something was
>> missing and I suggested to add this or that bit of information.
>>
>> It's easy to sign up on GitHub and make a suggestion. You can't damage
>> anything. Everything will get reviewed and maybe discussed. There's also
>> guidelines in the docs how to contribute.
>>
>> Best regards, Tobias
>>
>> 22.04.2021 14:09:30 Zac Wang <zacwang15 at gmail.com>:
>>
>> Hi guys,
>>
>> Thank you for all your replies.
>>
>> 'qgis.utils.plugins' really resolves my problem.
>>
>> This issue obsessed me for a few days, and your advice is fantastic.
>>
>> I can't understand why there is no documentation for such a useful
>> functionality.
>>
>> Anyway, thank you for your help. Appreciate it.
>>
>>
>> Cheers,
>>
>> Zac
>>
>>
>> On Thu, 22 Apr 2021 at 22:01, Raymond Nijssen <r.nijssen at terglobo.nl>
>> wrote:
>>
>>> Hi Zac,
>>>
>>> You can use:
>>>
>>> qgis.utils.plugins
>>>
>>> to get a dictionary with all active plugins.
>>>
>>>
>>>
>>> To find out if another plugin is available:
>>>
>>> 'processing' in qgis.utils.plugins
>>>
>>>
>>>
>>> And use it like:
>>>
>>> processing_pl = qgis.utils.plugins['processing']
>>> processing_pl.toolbox.searchBox.setText('overlay')
>>>
>>>
>>> Hope this helps,
>>>
>>> Raymond
>>>
>>>
>>> On 22-04-2021 13:07, Zac Wang wrote:
>>> > Hi all,
>>> >
>>> > Are there some ways to transfer data between different pyqgis plugins?
>>> I
>>> > hope plugins share state.
>>> >
>>> > The only way I found is to make pluginA to be a child component of
>>> > QgisApp(iface.mainWindow()).
>>> >
>>> > Then in another pluginB, call findChild() to get the object(pluginA)
>>> and
>>> > connect its signal.
>>> >
>>> > This is a possible solution, but it's not easy to maintain because
>>> > plugins are not initiated in the same file.
>>> >
>>> > Is there a better solution?
>>> >
>>> > Regards,
>>> >
>>> > Zac
>>> >
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