vbdpss.hlp (Table of Contents; Topic list)
Article Q27324
                                                 Contents  Index  Back
─────────────────────────────────────────────────────────────────────────────
                           Knowledge Base Contents  Knowledge Base Index
 
 Passing Numeric Variables between Basic and C by Far Reference - Q27324
 
 The following example demonstrates how to pass numeric values from
 compiled Basic to Microsoft C by far reference.
 
 This information applies to the Standard and Professional Editions of
 Microsoft Visual Basic version 1.0 for MS-DOS and to Microsoft C
 Compiler version 7.0.
 
 To compile this example in Visual Basic for MS-DOS, execute the
 following commands:
 
    BC BMODULE.BAS;
    CL -c -AM CMODULE.C
    LINK BMODULE.OBJ CMODULE.OBJ;
 
 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#))
 LOCATE 5, 1
 END
 
 C Routine
 ---------
 
 #include <stdio.h>
 void NumericFar(int far *a, long far *b, float far *c, double far *d)
 {
    printf("INTEGER  %d\", *a);
    printf("LONG     %ld\", *b);
    printf("FLOAT    %f\", *c);
    printf("DOUBLE   %lf\", *d);
 }
 
 Output
 ------
 
 INTEGER  32767
 LONG     32769
 FLOAT    123.311996
 DOUBLE   129381.333000