Release 10.1A: OpenEdge Development:
.NET Open Clients

Defining the return type for a user-defined function

You must specify the return type for a user-defined function as part of setting up the parameters. You can set this return type using the ReturnType property of the Progress.Open4GL.Proxy.ParamArray object:

Syntax

public int ReturnType

You must set this property to the class constant defined in Progress.Open4GL.Parameter that corresponds to the Progress 4GL data type returned by the user-defined function, as shown in Table 8–3.

Table 8–3: User-defined function return types for the OpenAPI 

Progress data type	Progress.Open4GL.Parameter class constant
CHARACTER	PRO_CHARACTER
COM-HANDLE	PRO_COMHANDLE
DATE	PRO_DATE
DATETIME	PRO_DATETIME
DATETIME-TZ	PRO_DATETIMETZ
DECIMAL	PRO_DECIMAL
INTEGER	PRO_INTEGER
LOGICAL	PRO_LOGICAL
RAW	PRO_RAW
RECID	PRO_RECID
ROWID	PRO_ROWID
WIDGET-HANDLE	PRO_WIDGETHANDLE

Note: LONGCHAR, MEMPTR, TABLE, TABLE-HANDLE, DATASET, and DATASET-HANDLE cannot be return types of a user-defined function.

For example, to set the return type for a user-defined function to the 4GL INTEGER data type, you can set the ReturnType property on a ParamArray object, parms, as follows:

parms.ReturnType = Parameter.PRO_INTEGER;