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My
best understanding/explanation is that "TableName.obj" refers to a column and
not to a single specific object. The alias will get the value of that column for
a specific object (=row). As some functions return information about one
specific object, the alias is the only way to have the function perform its
task.
But do
not push me any further on the theory of "alias" and its applications, that is
all I could come up with.
Jacques
Paris
e-mail
alternate
[EMAIL PROTECTED]
[EMAIL PROTECTED]
paris PC Consult (mainly MapInfo
app.)
www.total.net/~rparis/gisproducts.htm
Hi All,
Can someone explain why one has to use alias
variables in the simple snippet below to make it work? When I tried to use
:
start_x = CentroidX (sTableName.obj)
start_y = CentroidY(sTableName.obj)
the program generates error messages.
Thanks
Jack
Here is the snippet:
Dim start_x, start_y As Float
Dim a as Alias
Dim b as Alias
Dim nrows, crows as smallint
Dim szFullTableName, sTableName as String
szFullTableName = FileOpenDlg("","","TAB","Open
Table with Point Objects")
Open Table szFullTableName
sTableName = PathToTableName$(szFullTableName)
crows=1
nrows = TableInfo(sTableName, TAB_INFO_NROWS)
Do While (crows <= nrows)
Fetch Rec crows From sTableName
a = sTableName + ".obj"
start_x = CentroidX (a)
start_y = CentroidY(a)
' this code
works
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