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dbbind error

Posted on 2004-10-09
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Last Modified: 2007-12-19
I get the below error on dbbind when attempting to build the below module.  What could be causing this?

error:
Performing Custom Build Step on .\test.sc
ESQL test.sc:
Compiling...
test.cpp
c:\test\test.cpp(25) : error C2664: 'dbbind' : cannot convert parameter 5 from 'char *' to 'unsigned char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

test.sc:
#define      DBNTWIN32
#include "windows.h"
#include <sqlfront.h>
#include <sqldb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>

PDBPROCESS dbproc;
PLOGINREC login;
RETCODE result_code;

char sql_stmt[256];
char testvar[51];

void main() {
  void sqlconn();

  sqlconn();

  sprintf(sql_stmt,"SELECT testvar FROM testtable");
  dbcmd(dbproc,sql_stmt);
  dbsqlexec(dbproc);

  while ((result_code = dbresults(dbproc)) != NO_MORE_RESULTS) {
    if (result_code == SUCCEED) {
        dbbind (dbproc,1,NTBSTRINGBIND,(DBINT) 0,(char *) testvar);

        while (dbnextrow(dbproc) != NO_MORE_ROWS) {
          fprintf(stdout,"testvar: %s\n",testvar);
        }
      }
  }
}

/* sqlconn procedure */

void sqlconn() {
  if (dbinit() == (char *)NULL) {
      fprintf(stdout,"Communications layer not loaded!\n");
      return;
  }

  login = dblogin();
  DBSETLUSER(login,(char *)"testlogin");
  DBSETLAPP(login,(char *)"testapp");
  DBSETLPWD(login,(char *)"testpwd");
  DBSETLVERSION(login,DBVER60);

  if ((dbproc = dbopen(login,"testsvr")) == NULL) {
      fprintf(stdout,"dbopen failed!\n");
      return;
  }

  dbuse(dbproc,"testdb");
  fprintf(stdout,"Success!\n");

} /* end sqlconn procedure */
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Question by:arichexe
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1 Comment
 
LVL 15

Accepted Solution

by:
efn earned 125 total points
ID: 12269196
The fifth parameter to dbbind is declared as LPBYTE.  (I assume you are using the dbbind from the Microsoft SQL Server DB-Library.)  LPBYTE is a pointer to a BYTE.  A BYTE is an unsigned char.  So the parameter type is unsigned char*.  You are passing a pointer to char, not unsigned char, as this parameter, and that's not close enough for the compiler.  The simplest fix would be to declare the testvar array as an array of unsigned char.  Then you could just use its name as the parameter, without a cast, and the compiler would be satisfied.
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