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

[Tobias Schmetzer]

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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