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I am writing a standalone script using QGIS processing plugins. everything works but after adding a new command it gives me some errors. The command is as folloing:

processing.runalg("grass7:v.clean",
                BK3,
                2,
                dgarc,
                None,
                -1,
                0.0001,
                BK4,
                BKerror)

dgarc is a float number and is equal to 1.BK3 and BK4 are string and are correctly defined. many other processes working with the same strings. The error is as following:

Error: Wrong parameter value: None

PolyGeo
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Mohamad Reza Salehi Sadaghiani
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1 Answers1

2

I think you need to specify the GRASS_REGION_PARAMETER as extents, e.g., 

processing.runalg("grass7:v.clean",
            BK3,
            2,
            dgarc,
            "%f , %f, %f, %f "% (xmin , xmax , ymin , ymax),
            -1,
            0.0001,
            BK4,
            BKerror)

This question had a similar issue.

user55937
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  • There is no error during execution in command window but the results are not as it should be. for example the dangling arcs are not deletes. I use the sme variables in QGIS, there it works but in standalone script it does not work. I mean, it works but delivers wrong result better to say the shap-file is as same as before. – Mohamad Reza Salehi Sadaghiani Nov 23 '17 at 12:35