Probably OS specific, I see this issue while using QGIS 2.14.11 and 2.18.3 versions on Windows64 platform.

When I import a vector to QGIS by Layer | Add Layer | Add Vector Layer the layer source writes backslash in its path. Can I fix this to forward slash?

[EDIT] This includes "Can I avoid backslash when I load vector files?"

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These vector layers with backslash work fine usually, but it becomes troublesome if I try to read the layer from R script. For instance if I try to read a layer of .csv file (without geometry) from a Processing rsx script by ##Layer=table it returns an error Error 'u' used without hex digits in character string.

  • I confirm the issue, but the same doesn't happen if you drag&drop the file in the canvas for importing it (in this case, I see the forward slashes). However, I don't understand how your second issue should be related to the first one if you are using a script. – mgri Feb 12 '17 at 20:56
  • @mgri thanks, it is interesting importing by drag&drop gives forward slashes. And sorry I was not clear about the issue. I have trouble reading the layer (after loading) from Processing Toolbox - R script. Edited my post to try to clarify the issue. – Kazuhito Feb 12 '17 at 22:28
  • I'm unfamiliar with r scripts, but can you give me an example of the filepath directly printed by the script? Is it something like C:\GIS\temp\1.csv or C:\\GIS\\temp\\1.csv? I think it should be sufficient using something like print Layer. – mgri Feb 12 '17 at 22:38
  • @mgri Unfortunately rsx scripts in processing does not have filepath in itself (you are correct about r scripts, that the filepath is set by user). Processing rsx scripts with ##Layer= headerline reads layer as input and if it is set ##Layer=table it try to read .csv table (in the Layers Panel) into the script by read.csv() function. – Kazuhito Feb 12 '17 at 22:48
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    @mgri Many thanks! I will try to follow that lead. BTW, will you post your comments as answer? I confirm it works. I should have included "to avoid backslash" as solution to my issue, equal to "to fix". – Kazuhito Feb 12 '17 at 23:54

I confirm the issue, but the same doesn't happen if you drag&drop the file in the canvas for importing it (in this case, I see the forward slashes).

I'm unfamiliar with R scripts, but I think there would be a way to directly retrieve the filepath instead of loading the layer in the Layers Panel before running the script (I mean, something similar to QgsVectorLayer() for PyQGIS): after a simple search, this thread could be useful for retrieving the filepath?

If you have success, or as an additional hint, you may also include a check on the filepath, for example:

filepath = 'C:\\GIS\\temp\\1.csv'
if '\\' in filepath:
    newpath = filepath.replace("\\", "/")
print newpath
  • 1
    Thanks! It works. I will try to follow the suggested lead, but the tip to avoid backslash is sufficient for me at the moment. If I can add, loading a vector file from Browser Panel is another way to avoid backslash. (I found it after your "drag&drop" suggestion.) – Kazuhito Feb 13 '17 at 8:41
  • I'm glad this workaround worked! it's been so long time since I uploaded something from Layer | Add Layer | Add Vector Layer =) – mgri Feb 13 '17 at 8:44

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