Release 10.1A: OpenEdge Development:
Programming Interfaces

Using structure parameters

Many shared library routines require a pointer to a structure rather then a scalar value. Progress provides the MEMPTR DEFINE VARIABLE statement. Once initialized, you can use the MEMPTR variable with a set of 4GL statements and functions to build, read, and modify the contents of any C-compatible structure used by your shared library routines. For basic information on the MEMPTR data type and how to use it, see Chapter 8, " Introduction to External Program Interfaces." This section provides information on using MEMPTR variables as parameters to shared library routines.

Note: You cannot use the Progress RAW data type to build structures that you pass to shared library routines.