Returning an error within a scriptcommand

FROM : Olivier
DATE : Wed Nov 13 18:29:12 2002

I have implemented scripting within my app and now i would like to
return valuable information when an error is encountered during a
script execution to allow for better debugging of script. My problem is
that i have no idea of how to return an error.

For exemple in a get command if i ask for an item that is out of bound,
how do i return that error

using keyvalue coding the method will look like, right now it returns
nil if the object isn't found, how can i return my own error

-(id)valueInCellsAtIndex:(unsigned)index
{
    id returnValue = [[[Cell alloc] initWithRowIndex:index
columnIndex:0 container: self] autorelease];

    return returnValue;
}


Olivier
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