David:
I use the ALP 9.9.5 docs in PDF format. Look at the command
"AL_AddCalculatedColumn"
and then click the link on that page to get to "Calculated columns"
--
Douglas von Roeder
949-910-4084
On Tue, Oct 19, 2021 at 1:15 PM David Rose via 4D_Tech <4d_tech@lists.4d.com>
wrote:
> I am converting some older ALP code in a v17 database to the modern code.
> In the old code, if you have an area that is displaying fields, and you
> have a calculated column you would do this:
>
> $Error:=AL_SetFields ($Area_l;$TableNumber_i;4;1;0) //specifies the col
> as a calculated one
>
> Then this:
> AL_SetCalcCall ($Area_l;4;"MyCalcCallMethod")
>
> In the new code we set the fields like this:
>
> ARRAY POINTER(aPtr;4)
> aPtr{1}:=->[Vendors]ID
> aPtr{2}:=->[Vendors]Last_Name
> aPtr{3}:=->[Vendors]First_Name
> aPtr{4}:=?? (see below)
>
> $err:=AL_SetObjects ($Area_l;ALP_Object_Columns;aPtr)
>
> And the callback method like this:
> AL_SetColumnTextProperty ($Area_l;4;ALP_Column_Callback;"MyCalcCallMethod
> ")
>
> I didn't see in the docs what you assign to the aPtr array element for the
> calculated column. If I size the aPtr array to 3, then set a callback
> method for column 4, I get an error.
> Ditto if I size the array to 4 but don't assign anything to the 4th
> element.
>
> Pls advise.
> TIA,
> David
>
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