How to use `export` with buffer?

Exporting the data of a table before deleting it work like a charm.
Example :

OUTPUT TO VALUE("C:\mytable.d") APPEND.
EXPORT mybd.mytable.
OUTPUT CLOSE.
DELETE mybd.mytable.


However, I've yet to make it work when using a buffer instead. The following export me an integer instead of the data deleted.

DEF INPUT PARAM hlTableToDelete AS HANDLE NO-UNDO.
...
OUTPUT TO VALUE("C:\" + hiTableToDelete:NAME + ".d") APPEND.
EXPORT hlTableToDelete:HANDLE.
OUTPUT CLOSE.
hlTableToDelete:BUFFER-DELETE().


Which syntaxe is needed for command export to work and actually export the data of the buffer?

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