Thanks Nyall, Our posts crossed !
Ok for the shortcut and the getMapLayer method. One question : in my alg, if I use QgsProcessingParameterFeatureSource instead of QgsProcessingParameterVectorLayer for my input, can I still use mapLayerFromString and the getFeatures, or is there a featureSourceFromString which allows me to loop through the features ? Michaël 2018-02-16 7:22 GMT+01:00 Nyall Dawson <[email protected]>: > On 16 February 2018 at 04:36, kimaidou <[email protected]> wrote: > > Hi all, > > > > I have a simple processing python alg which > > * generates a buffer with qgis:buffer > > * use qgis:fieldcalculator to add an buf_area field -> the output vector > of > > my alg is this buffer+new field. > > > > I would like to parse the features of the output vector in order to > gather > > some information and put it in a new string output. I have not been able > to > > get the layer object to perform a getFeatures on it. > > > > See the code > > http://paste.debian.net/1010463/ > > > > In line 32, my blayer is None > > I think I am not using the good way to get the output vector layer > features? > > I tried to use the same way as for reading an input layer, but oviously > it > > is different. > > blayer = QgsProcessingUtils.mapLayerFromString( area_result[ 'OUTPUT' > ]), context ) > > I'm thinking of adding a shortcut for this to the context, e.g.: > > blayer = context.getMapLayer( area_result['OUTPUT'] ) > > What do you think? > > Nyall >
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