[GIS] Loading Vector Layer using python console in qgis

pyqgispython-2.7qgisvector

I am using qgis2.6 version and new to pyQGIS. I tried to load a vector file using python console in qgis. I don't know where I am wrong. The layer was not loaded and does not show any error too. Help would be appreciated.The code which i tried is below.

wb = QgsVectorLayer('C:\Users\new\Desktop\PyQGIS\pyqgis_data\world_borders.shp', 'world_borders', 'ogr') QgsMapLayerRegistry.instance().addMapLayer(wb)

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Best Answer

I don't have a Windows OS to test it, but I'm pretty sure the problem is in the path to your ShapeFile. Make sure the path is correct and try with slashes (/) or double back slashes (\\).

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QGIS – Using In-Memory Vector Layer with QGIS Processing/SEXTANTE

As it turns out, this works fine as long as you add the memory layer to the table of contents before using it. It seems the dataobjects.getObjectFromUri function in the QGIS source can't handle it otherwise.

So the following works very well:

QgsMapLayerRegistry.instance().addMapLayer(mem_layer)
processing.runalg("qgis:clip", layer, mem_layer, output)

Also see my recent question for how to use memory layers as output from processing functions (basically use processing.runandload instead of processing.runalg).

[GIS] How to load multiple vector layers into QGIS’ map canvas using python scripting

I figured it out! It was something very small. Basically, the layers you would like to see displayed on the canvas is provided through canvas.setLayerSet(list_of_layers).

# total list of layers actually displayed on map canvas
canvas_layers = []

# load vector layers
for files in os.listdir(source_dir):

    # load only the shapefiles
    if files.endswith(".shp"):

        # create vector layer object
        vlayer = QgsVectorLayer(source_dir + "/" + files, files, "ogr")
        print(files)

        # add the layer to the registry
        QgsMapLayerRegistry.instance().addMapLayer(vlayer)

        # combine extent of the current vector layer with the extent of the created "extent" rectangle object
        extent.combineExtentWith(vlayer.extent())
        canvas_layers.append(QgsMapCanvasLayer(vlayer))


# set extent to the extent of a larger rectangle so we can see all geometries       
canvas.setExtent(extent)

# provide set of layers for display on the map canvas
canvas.setLayerSet(canvas_layers)

Best Answer

Related Solutions

QGIS – Using In-Memory Vector Layer with QGIS Processing/SEXTANTE

[GIS] How to load multiple vector layers into QGIS’ map canvas using python scripting

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