Thank you for the advice. Using:
Objectlen(overlap(...., "m")), instead of
Overlap(..., "m") and ObjectLen(obj, ""m"")"
has solved the problem.
Thanks again.
Charlotte
>
> Subject: MI-L Problem with Overlap() function in MapBasic
>
> I'm having problems using Overlap() in a MapBasic program. I want to
> find
> out what lines in the layer szLineInPolyLayer intersect with a specified
> polygon (mszPlanAppID) in DEF_TAB_PLAN_APPS layer. I also want the
> length
> of the line covered by the polygon mszPlanAppID.
>
> According to MapBasic Reference Guide, if one of the objects is linear
> and
> the other is a region Overlap() returns the part of the linear object
> covered by the region.
>
> However, using the code copied below, the ObjectLen returns zero. Can
> anyone offer any advice as to what has gone wrong?
>
> Thanks,
> Charlotte
>
> szGetLineInPolyStats = "Select " + "Overlap(" + szLineInPolyLayer +
> ".obj,
> " + DEF_TAB_PLAN_APPS + ".obj), " + "ObjectLen(obj, ""m"")"
>
> szGetLineInPolyStats = szGetLineInPolyStats + "From " +
> DEF_TAB_PLAN_APPS
> + ", " + szLineInPolyLayer + " Where " + DEF_TAB_PLAN_APPS + ".obj
> Intersects " + szLineInPolyLayer + ".obj And " + DEF_TAB_PLAN_APPS +
> ".col1 = " + """" + mszPlanAppID + """" + " Into ResultTable Browse *
> From
> ResultTable"
>
>
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=====
It works! Now, if I could only remember what I did...
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