[QGIS-Developer] createAlgorithmDialog in Processing script (within plugin)

[matteo]

Just a quick update, the fix is now in master and backported:

https://github.com/qgis/QGIS/issues/51971
https://github.com/qgis/QGIS/pull/51985

Thanks to all the devs!

Cheers

Matteo

On 2/22/23 08:33, matteo wrote:
> Hi Richard,
> 
>> Not very helpful for you, but what about creating an issue with the 
>> minimal code to crash?
> 
> done: https://github.com/qgis/QGIS/issues/51971
> 
> I've prepared a minimal algorithm that mimics the problem
> 
>> And about Thread/Crash problems: I have been succesful with the tips 
>> of Nyall in: 
>> https://lists.osgeo.org/pipermail/qgis-developer/2023-February/065525.html to create a QgsTask which either crashed or gave warnings...
>>
>> One thing I've seen recently is that some Processing algs with me give 
>> these "...is run from a different thread than the object  lives in 
>> ..."-warnings.
>> And my feeling is that if some code is fetching references to the QGIS 
>> application instance, it shows this warning.
>>
>> Good luck solving your issue
> 
> Thanks! Some gurus around? :)
> 
> Cheers
> 
> Matteo
>> Regards,
>>
>> Richard
>>
>>
>>
>> On 2/21/23 16:41, matteo via QGIS-Developer wrote:
>>> Hi devs,
>>>
>>> I'm raising this email again because I don't know if this a 
>>> bug/limitation/correct behavior.
>>>
>>> I also think that the problem is from a thread point of view, at 
>>> least by the crash that I have.
>>>
>>> Knowing that a processing algorithm, as suggested by Germàn, can be 
>>> created with:
>>>
>>> processing.createAlgorithmDialog("my_provider:my_algorithm", params)
>>>
>>> within a plugin, if the algorithm **id** is passed as first argument, 
>>> QGIS is crashing, while it seems working on a standalone script in 
>>> the QGIS code editor.
>>>
>>> Is this a limitation?
>>>
>>> Cheers and thanks for any suggestion!
>>>
>>> Matteo
>>>
>>> On 8/1/22 15:23, matteo wrote:
>>>> Hi all,
>>>>
>>>> I've a set of custom processing scripts within a plugin (that is 
>>>> both "normal" and processing provider plugin).
>>>>
>>>> I'm trying to executing the dialog of these algorithm from one of 
>>>> the main plugin file. I found the processing.createAlgorithmDialog 
>>>> [0], but it is constantly crashing when I'm passing the instance of 
>>>> the algorithm:
>>>>
>>>> my_alg = MyCustomAlg()
>>>> my_dialog = my_alg.createAlgorithmDialog(custom_dict)
>>>>
>>>> ## crash here
>>>>
>>>> Thinking it was a problem of the threads I also tried to overwrite 
>>>> the `flag` method in the algorithm by setting also 
>>>> QgsProcessingAlgorithm.FlagNoThreading but with the same results.
>>>>
>>>> I know I can run the processing algorithm with processing.run(....) 
>>>> but I need to open the dialog pre-filled with custom parameters and 
>>>> to get also some other outputs besides the standard ones (like the 
>>>> QgsFeatureSink path)
>>>>
>>>> Thanks for any suggestion
>>>>
>>>> Cheers
>>>>
>>>> Matteo
>>>>
>>>>
>>>> [0] 
>>>> https://github.com/qgis/QGIS/blob/master/python/plugins/processing/tools/general.py#L155
>>>>
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