OPDESC

The OPDESC keyword specifies that operational descriptors are to be passed with the parameters that are defined within a prototype.

When OPDESC is specified, operational descriptors are passed with all character or graphic parameters that are passed by reference. If you attempt to retrieve an operational descriptor for a parameter passed by value, an error will result.

Note:

Operational descriptors are not passed for UCS-2 fields.

Using CALLP with a prototyped procedure whose prototype contains OPDESC is the same as calling a procedure using CALLB (D). Operational descriptors are also passed for procedures called within expressions.

The keyword applies both to a prototype definition and to a procedure-interface definition. It cannot be used with the EXTPGM keyword.

Note:

If you use the OPDESC keyword for your own procedures, the RTNPARM keyword can affect the way you call APIs such as CEEDOD to get information about your parameters. See RTNPARM and %PARMNUM (Return Parameter Number) for more information.

For an example of the OPDESC keyword, see the service program example in the IBM Rational Development Studio for i: ILE RPG Programmer's Guide.

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