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

[matteo]

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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