Dim Fields in Queue for LIST Box shows 10 : Parameter typing error

code
1

Trying to show a queue with dim fields in a list box.
I get an error as soon as the window opens.

TestQueue Queue(),Pre()
Name String(20)
DimStr String(20),Dim(20)
  End

If I create a window with the Name and DimStr[1] in a listbox I get an error:
Unknown Error Posted : 10 : Parameter typing error

I am sure I remember usinig dim in topspeed files and showing the fields in a browse.
I must be missing something but what???
QueueTest.zip (38.1 KB)

3

You cannot use DIM() fields in a Queue that feeds a LIST. As you saw you get an error at runtime.

The more difficult workaround is to use a VLB (aka Virtual List Box or VLBProc) where you supply a callback that can supply the data using any Queue, File or method. VLB’s work very well.

The simplest workaround is to use OVER() like:

TestQueue Queue(),Pre()
Name String(20)
DimStr_1 String(20)   !was DimStr String(20),Dim(20)
DimStr_2 String(20)   !now have 20 STRING(20) fields
... 3 - 18 ...
DimStr_19 String(20)
DimStr_20 String(20)
End

DimTestQueue GROUP(),Pre(DimTestQ) ,OVER(TestQueue)
Name String(20)
DimStr String(20),Dim(20)
   End

You can have a GROUP in the Queue which is nice so you just Over the Array. But you must count that Group as a Field and skip that Field in your Format using #Field#. Not sure if that can work with a Browse template.

TestQueue Queue(),Pre()
Name String(20)
DimStr_Group  GROUP,PRE()  !Will be Field #2#
DimStr_1 String(20)        !Will be Field #3#
DimStr_2 String(20)
... 3 - 18 ...
DimStr_19 String(20)
DimStr_20 String(20)
       End  !Group
   End

DimStr String(20),Dim(20) , OVER(DimStr_Group)

My LIST Format Tool can be helpful. You can paste in any FORMAT() string and it will preview a working LIST fed by test data using VLB.

The Browse Template makes its own Queue that will not have DIM fields, it will just have the Subscript(s) you picked.

4

Another option is to use a VLBProc to serve the data

5

Not important, but Carl had already mentioned that in his detailed response.

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