[QGIS-Developer] Create Grid (Grid.py) Crash and Exception

[Alan A. Mick]

Thanks! That worked!

I put in a fully qualified file name in the "Grid" dialog box and it 
worked - I left the "Open output file after running algorithm" checked 
and it adds the vector layer to my project. It uses a default layer name 
of "Grid" rather than my file name, but I can rename it.

Exploring a bit, I opened the [...] button for the input field and 
selected File. I got the standard Save file dialog defaulted to 
C:\Users\me\AppData\Roaming\QGIS\QGIS3\profiles\default\processing\outputs. 
My bet is that this directory requires special permission to write to, 
and I would not want to put my files there anyway.

RE: Was this done through the processing toolbox? How did you obtain the
"test" value here?

Yes, I used the processing toolbox: Processing->Toolbox->Vector 
creation->Create grid. The dialog that opens has a "Grid" section at the 
bottom with an input field. By default it contains the advisory [Create 
temporary layer]. I used this the first time I tried Create Grid, and it 
worked. I then renamed the layer in the layer panel and saved it. Given 
my experience, I assumed that I could type in the name of a layer here 
and it would put the layer in the layer panel, from which I could save 
it. I now understand how it works. Thanks!

For reference, I have attached a screen shot of the dialog box - hope it 
makes it through the list server!


Since this is a developer list, I have two suggestions - First update 
the Create Grid documentation, second, create an "invalid file name" 
trace in the log or some such message so the cause of the problem would 
be better understood by those who might run into it.

I'm sure I can update the documentation, and I might be able to update 
the code also. What should I do to get involved with helping out?





On 7/25/2018 6:40 PM, Nyall Dawson wrote:
> Looking at this, the value for output is a bit odd: 'test'.  This
> should usually be a full path, e.g. "c:\users\nd\Desktop\all my
> important stuff which i need\grid_final_rev2_revised.shp". I suspect
> this is where the issue comes from, it's trying to create a file named
> "test" in an unspecified directory which is likely somewhere you don't
> have permission to write to.
>
> Was this done through the processing toolbox? How did you obtain the
> "test" value here?
>
> Nyall

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