Example Passing Basic String Descriptor to Microsoft C (27296)

SUMMARY

The example below demonstrates how to pass a string descriptor from compiled Basic to Microsoft C.

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.

MORE INFORMATION

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 Microsoft Knowledge Base using the following word:

BAS2C

Code Example

REM ===== Basic PROGRAM =====

DECLARE SUB StringNear CDECL (a$)
CLS
array$ = "This is a test" + CHR$(0)
CALL StringNear(array$)
END

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

#include <stdio.h>
struct struct_string{
     int length;
     char *address;
};

void StringNear(string)
   struct struct_string near *string;
 {
    int i;
    printf("The string is : %s \n\n",string->address);
    printf(" Index       Value       Character\n");
    for (i=0;i < string->length; i++)
       {
       printf("  %2d          %3d            %c\n",i,
              string->address[i], string->address[i]);
       };
 }

===== OUTPUT =====

The string is : This is a test

 Index       Value       Character
   0           84            T
   1          104            h
   2          105            i
   3          115            s
   4           32
   5          105            i
   6          115            s
   7           32
   8           97            a
   9           32
  10          116            t
  11          101            e
  12          115            s
  13          116            t
  14            0