The problem must be the definition of the output string, because I tried the same code but writing a route directly on the parameters list and it worked.
This is the code I wrote:
import processing
import os
#defines the folder
folder="C:/Users\Pueyo/Google Drive/Consultoria/Mapa escolar/Dades UMAT/heatmap"
#captures the files in the folder
filelist=os.listdir(folder)
feedback = QgsProcessingFeedback()
#if the file is a shapefile, run the algorithm
for file in filelist:
if file.endswith('.shp'):
layer=QgsVectorLayer(folder+file,file,'ogr')
file2 = file.replace(".shp","")
output=str(folder + "/hm200_" + file2 + ".tif")
parameters={'INPUT':layer,'RADIUS':200, 'PIXEL_SIZE':5, 'OUTPUT':output}
processing.runAndLoadResults('qgis:heatmapkerneldensityestimation',parameters,feedback=feedback)
I attach a screen capture of the code.
This is the error message I get:
Traceback (most recent call last):
File "C:\PROGRA~1\QGIS3~1.4\apps\Python37\lib\code.py", line 90, in runcode
exec(code, self.locals)
File "", line 1, in
File "", line 15, in
File "C:/PROGRA~1/QGIS3~1.4/apps/qgis-ltr/./python/plugins\processing\tools\general.py", line 138, in runAndLoadResults
return Processing.runAlgorithm(alg, parameters=parameters, onFinish=handleAlgorithmResults, feedback=feedback, context=context)
File "C:/PROGRA~1/QGIS3~1.4/apps/qgis-ltr/./python/plugins\processing\core\Processing.py", line 183, in runAlgorithm
raise QgsProcessingException(msg)
_core.QgsProcessingException: There were errors executing the algorithm.
Hello Josep Pueyo-Ros ,
Have you checked if the file name or path is correct?
Regards.
Yes, I did. If after running the script and getting the error message, I print the output string, I get this:
>>>print(output)
C:/Users/Pueyo/Google Drive/Consultoria/Mapa escolar/Dades UMAT/heatmap/hm200_alzines.tif
If I copy this string as the output parameter in parameters, it works:
import processing
import os
feedback = QgsProcessingFeedback()
layer=qgis.utils.iface.mapCanvas().currentLayer()
parameters={'INPUT':layer,'RADIUS':200, 'PIXEL_SIZE':5, 'OUTPUT':"C:/Users/Pueyo/Google Drive/Consultoria/Mapa escolar/Dades UMAT/heatmap/hm200_alzines_.tif"}
processing.runAndLoadResults('qgis:heatmapkerneldensityestimation',parameters,feedback=feedback)
I also checked the route of the folder and the got filelist by using the same script to run a buffer algorithm and setting the output parameter to 'memory:', and it also worked.
This is why I'm pretty sure that the problem is with the definition of 'output'.
Thank you.
I recently had a trouble with the way I set the path to files on Python scripts on Windows 7 and 10. Using the a single bar (/), the script didn't find the archives I was wanting to load, so I used two bars (//) on the paths and It worked... I found it very strange because I always used only one bar and then came this change.
I tried the double bar trick, but it didn't work. However, it was useful because then I realized that a bar was missed after the folder route:
folder="C:/Users/Pueyo/Google Drive/Consultoria/Mapa escolar/Dades UMAT/heatmap/"
Otherwise, the string "folder+file" couldn't work.
Thank you!
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