Restrictions to Using the Call Method
There are some restrictions to using the Call method. This method can be invoked only in the following places:
• In a statement by itself
• As the right side of an assignment
The Call method can never be invoked inside an expression.
If a procedure handle represents a local procedure that was defined in a frame or global procedure component, there are two additional restrictions on when the Call method can be invoked on the procedure handle:
• The Call method cannot be invoked after the frame or global procedure in which it was defined (and which contains the scope on which the GetProcHandle was issued) has terminated.
• The Call method cannot be invoked from a “thread” other than the one in which the GetProcHandle was issued.
For example, a frame can create a procedure handle on one of its local procedures and pass it as a callback routine to a called frame, but not to an opened frame (because the openframe statement creates a new thread).
These restrictions do not apply to a procedure handle that represents a global procedure or a local procedure defined in a user class script.
Last modified date: 12/20/2023