BUG: Handler Function Prototypes Incorrect for C++

• Microsoft SQL Server Programmer's Toolkit, version 4.2

SYMPTOMS

Attempting to compile a C++ DB-Library application for Microsoft Windows NT generates the following compiler errors when either the Win32 SDK or Visual C++ for Windows NT is used:

   error C2664: 'dberrhandle' : cannot convert parameter 1 from
     'int (void *,int ,int ,int ,char *,char *)' to
     'int (__cdecl *)(void )'
   error C2664: 'dbmsghandle' : cannot convert parameter 1 from
     'int (void *,long ,int ,int ,char *)' to
     'int (__cdecl *)(void )'

CAUSE

The DBNTWIN32 section of the SQLDB.H header file declares the dberrhandle and dbmsghandle functions improperly for C++.

WORKAROUND

In the DBNTWIN32 section of SQLDB.H, change the following line (line 628 in the SQLDB.H file dated 8/24/93) from:

   typedef  int (SQLAPI *SQLFARPROC)();

   typedef int (SQLAPI *SQLERRPROC)(DBPROCESS *,INT,INT,INT,CHAR *,CHAR *);
   typedef int (SQLAPI *SQLMSGPROC)(DBPROCESS *,DBINT,INT,INT,CHAR *);

   SQLAPI dberrhandle(SQLFARPROC);
   SQLAPI dbmsghandle(SQLFARPROC);

   SQLAPI dberrhandle(SQLERRPROC);
   SQLAPI dbmsghandle(SQLMSGPROC);

STATUS

Microsoft has confirmed this to be a problem in DB-Library version 4.20.50. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.