Im not going to pretend I understand whats going on. However, Ive found
that aliases act flaky if you refer to them too many times between fetches.
First, try replacing your problematic IF statement with a DO CASE statement
and see if that works.
If not, do what I always do: Retrieve the value of the alias into a
variable, and then work with the variable.
Object aliases are a little more difficult since you can't assign a null
object to a variable, so you have to do something like:
Dim o as object
Dim o_a as alias
o_a = "sometab.obj"
...
fetch next from sometab
if (o_a)
then o=o_a
do case ObjectInfo (o, OBJ_INFO_TYPE)
case 4, 7 .....
etc.
HTH
Spencer
________________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Nicki Cozens
Sent: Friday, July 28, 2006 9:14 AM
To: [email protected]
Subject: [MI-L] MAPBASIC Object or not Object?
Hi
I have what I believe is an object in a layer - I think it's a line - if I
query it in the Maspbasic window in MI with "select objectinfo (obj,1) from
table_name" then look at the selection table I see object type 3 ie a line.
If I use the following line in some Mapbasic code which interrogates the
same layer:
If ObjectInfo(ColAlias, OBJ_INFO_TYPE) = 4 or ObjectInfo(ColAlias,
OBJ_INFO_TYPE) = 7 then
Then I get the following error when it gets to the object that I believe is
a line:
(Blah.mb:123)ObjectInfo: argument 2 out of range
If I write what is happening out to a text file ie
Print #1, (temptablearray(i) +" "+ colname+" " +colAlias + " "+
ObjectInfo(ColAlias, OBJ_INFO_TYPE)) where colAlias is the Alias of the
column name: ColAlias = Temptabname & "." & Colname
I get the following:
Query134
Query134 object Polyline 4
The top line above is the line that I think is causing the problem, the
second line above shows a result that works.
Is this line an object or not and can I do anything to avoid the out of
range error?
I hope this all makes sense!!
Nicki
Nicki Cozens
Data Management Officer
Highways Development Control
Leicestershire County Council
County Hall
Glenfield
Leicester
LE3 8RA
Tel: 0116 265 7420
Fax: 0116 265 7133
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