Q27324: Passing Numeric Variables between BASIC and C by Far Reference

Article: Q27324
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 numeric values 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
------------

===== BASIC PROGRAM =====

DECLARE SUB NumericFar CDECL (_
        BYVAL p1o AS INTEGER, BYVAL p1s AS INTEGER,_
        BYVAL p2o AS INTEGER, BYVAL p2s AS INTEGER,_
        BYVAL p3o AS INTEGER, BYVAL p3s AS INTEGER,_
        BYVAL p4o AS INTEGER, BYVAL p4s AS INTEGER)
a% = 32767
b& = 32769
c! = 123.312
d# = 129381.333#
CLS
CALL NumericFar(VARPTR(a%), VARSEG(a%),_
                VARPTR(b&), VARSEG(b&),_
                VARPTR(c!), VARSEG(c!),_
                VARPTR(d#), VARSEG(d#))
END

===== C ROUTINE =====

#include <stdio.h>
void NumericFar(a, b, c, d)
   int far *a;
   long far *b;
   float far *c;
   double far *d;
 {
         printf("INTEGER  %d        \n",*a);
         printf("LONG     %ld        \n",*b);
         printf("FLOAT    %f        \n",*c);
         printf("DOUBLE   %lf        \n",*d);
 }

===== OUTPUT =====

INTEGER  32767
LONG     32769
FLOAT    123.311996
DOUBLE   129381.333000

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