[GRASS-dev] Re: gis.m: error message when trying to add layer without open map display

[Michael Barton]

Moritz,

I'll try to see what's going on with this. It probably has to do with the
necessary link between a layer tree and a display. A better error message
would likely be "You need to open a display before adding map layers"


Michael


On 2/8/07 6:11 AM, "Moritz Lennert" <mlennert at club.worldonline.be> wrote:

> Michael,
> 
> Since you have been busy working on error catching in gis.m: I've always
> found that the error that occurs when you try to add a layer even though
> there is no open map display quite difficult to understand for newbies:
> 
> invalid command name ".mainframe.frame.pw1.f0.frame.pgs.fpage_1.sw.tree_1"
> invalid command name ".mainframe.frame.pw1.f0.frame.pgs.fpage_1.sw.tree_1"
>      while executing
> "$tree($mon) selection get"
>      (procedure "GmTree::add" line 11)
>      invoked from within
> "GmTree::add vector"
>      ("uplevel" body line 1)
>      invoked from within
> "uplevel \#0 $cmd"
>      (procedure "Button::_release" line 18)
>      invoked from within
> "Button::_release .mainframe.topf.tb0.bbox2.b0"
>      (command bound to event)
> 
> 
> Would it be possible to catch this and produce a nicer error message
> such as: "You need to open a map display first." ?
> 
> Moritz

__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics and Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton