[Qgis-developer] Basic Processing plugin questions

Tom Chadwin tom.chadwin at nnpa.org.uk
Wed Apr 5 06:02:29 PDT 2017

volaya wrote
>> 2. Can a Processing plugin take *any* layer, rather than having to choose
>> between raster and vector?
> No, not at the moment. The multiple input can have several layer types
> at once, but single layers can't

Can it? If I add a multiple input, the dropdown only contains my project's
point (vector) layers. If I explicitly set the datatype for the
ParameterMultipleInput to -1 (see
the dropdown correctly contains all my vector layers (point, line, and

What I was hoping for is to able to take *any* layer - vector or raster.
However, datatype ALL_TYPES (defined as [-1] at
fails, as it won't accept a list:

File "C:/OSGEO4~1/apps/qgis/./python/plugins\processing\core\parameters.py",
line 362, in __init__
			    self.datatype = int(float(datatype))
			TypeError: float() argument must be a string or a number

I'm clearly not quite understanding this yet. Can anyone help?



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