Q27301: Passing BASIC User-Defined Type to C by Far Reference

Article: Q27301
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | B_BasicCom S_C S_QuickC | mspl13_basic
Last Modified: 6-NOV-1989

The following example demonstrates how to pass a user-defined type
from compiled BASIC to Microsoft C by far reference.

This information about inter-language calling applies to QuickBASIC
Versions 4.00, 4.00b, and 4.50 for MS-DOS and to Microsoft BASIC
Compiler Versions 6.00 and 6.00b for MS-DOS and MS OS/2.

For more information about passing other types of parameters between
BASIC and C, and a list of which BASIC and C versions are compatible
with each other, query in the Software/Data Library on the following
word:

   BAS2C

Code Example
------------

REM ===== BASIC PROGRAM =====

TYPE record
   a AS INTEGER
   b AS STRING * 20
   c AS SINGLE
END TYPE
DECLARE SUB TypeReference CDECL (BYVAL p1o AS INTEGER, _
                                 BYVAL p1s AS INTEGER)
CLS
DIM element AS record
element.a = 128
element.b = DATE$ + CHR$(0)
element.c = 39.6
CALL TypeReference(VARPTR(element), VARSEG(element))
END

/* ===== C ROUTINE ===== */

#include <stdio.h>
struct record{
       int a;
       char b[20];
       float c;
       };

void TypeReference(element)
     struct record far *element;
 {
     printf("Record.A = %d\n",element->a);
     printf("Record.B = %s\n",element->b);
     printf("Record.C = %f\n",element->c);
 }

===== OUTPUT =====

Record.A = 128
Record.B = 02-02-1988
Record.C = 39.599998