OS/2 FAQ

Это - кусок кода, наспех выдраный из U1 - вряд ли скомпилится у вас, но как пример - сойдет, надеюсь.

#define INCL_REXXSAA
#include <rexxsaa.h>                   /* needed for RexxStart()     */
#include <stdio.h>                     /* needed for printf()        */
#include <string.h>                    /* needed for strlen()        */



bool
CallRexx( const char *prog, string &out, const char *a1, const char *a2 )
{
RXSTRING arg[2];                    // argument string for REXX
RXSTRING rexxretval;                // return value from REXX

APIRET   rc;                        // return code from REXX
SHORT    rexxrc = 0;                // return code from function

if( prog == NULL || strlen(prog) == 0 )
return Err;

/* By setting the strlength of the output RXSTRING to zero, we   */
/* force the interpreter to allocate memory and return it to us. */
/* We could provide a buffer for the interpreter to use instead. */
rexxretval.strlength = 0L;          /* initialize return to empty*/

if( a1 == NULL ) a1 = "";
MAKERXSTRING(arg[0], a1, strlen(a1)); /* create input argument     */

if( a2 == NULL ) a2 = "";
MAKERXSTRING(arg[1], a2, strlen(a2)); /* create input argument     */

/* Here we call the interpreter.  We don't really need to use    */
/* all the casts in this call; they just help illustrate         */
/* the data types used.                                          */

rc=RexxStart((LONG)      2,             /* number of arguments   */
(PRXSTRING)  &arg,          /* array of arguments    */
(PSZ)        prog,          /* name of REXX file     */
(PRXSTRING)  0,             /* No INSTORE used       */
(PSZ)        "U1",         /* Command env. name     */
(LONG)       RXSUBROUTINE,  /* Code for how invoked  */
(PRXSYSEXIT) 0,             /* No EXITs on this call */
(PSHORT)     &rexxrc,       /* Rexx program output   */
(PRXSTRING)  &rexxretval ); /* Rexx program output   */


debug( "CallRexx() = '%s',int=%d, rexx=%d",rexxretval.strptr, rc, (int)rexxrc);

//    printf("Interpreter Return Code: %d\n", rc);
//    printf("Function Return Code:    %d\n", (int) rexxrc);
//    printf("Args:         '%s', '%s'\n", arg[0].strptr, arg[1].strptr );
//    printf("Ret :         '%s'\n", rexxretval.strptr);

if( rexxretval.strptr != NULL )
out = rexxretval.strptr;

DosFreeMem(rexxretval.strptr);          /* Release storage       */
/* given to us by REXX.  */

if( rexxrc != 0 )
{
error( EI_None, "CallRexx( '%s', out, '%s', '%s' ) returned %d",
prog, a1, a2, (int) rexxrc );
return Err;
}

return rc == 0 ? Ok : Err;
}