DOCUMENT:Q119064  11-FEB-2002  [visualc]
TITLE   :HOWTO: Retrieving a List of All ODBC Data Sources
PRODUCT :Microsoft C Compiler
PROD/VER::1.5,1.51,1.52,2.0,2.1,2.2,2.5,2.6,2.7,4.0,4.1,4.2,5.0,6.0
OPER/SYS:
KEYWORDS:kbcode kbProgramming kbDatabase kbMFC kbODBC kbVC kbVC200 kbVC210 kbVC220 kbVC400 kbVC5

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The information in this article applies to:

 - The Microsoft Foundation Classes (MFC), used with:
    - Microsoft Visual C++ for Windows, 16-bit edition, versions 1.5, 1.51, 1.52 
    - Microsoft Visual C++, 32-bit Editions, versions 2.0, 2.1, 2.2, 4.0, 4.1, 4.2, 5.0, 6.0 
 - Microsoft Data Access Components versions 1.5, 2.0, 2.1, 2.5, 2.6, 2.7 
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SUMMARY
=======

The Open Database Connectivity (ODBC) API contains a function called
SQLDataSources() which can be used to retrieve information about data sources
which are available to an application. Below is a sample function which fills a
CStringList with the names of all available ODBC data sources.

Sample Code
-----------

      #include <afxcoll.h>    //Needed for CStringList MFC class.
      #include "odbcinst.h"
      #include "sql.h"
      #include "sqlext.h"

      // NOTE: in 16-bit Visual C++ link with odbcinst.lib
      //       in 32-bit Visual C++ 2.x link with odbccp32.lib
      //       in 32-bit Visual C++ 4.x no need to change link options

      #define MAX_DSN_LENGTH 30
      #define MAX_DSN_DESC_LENGTH 300

      BOOL GetODBCDataSourceNames(CStringList * pList)
      {
          HENV hEnv;
          char szDSN[MAX_DSN_LENGTH];
          SWORD cbDSN;
          UCHAR szDescription[MAX_DSN_DESC_LENGTH];
          SWORD cbDescription;
          RETCODE retcode;

          ASSERT(pList->IsEmpty());
          if (SQLAllocEnv(&hEnv)!=SQL_SUCCESS)
              return FALSE;

          while (retcode=SQLDataSources(hEnv, SQL_FETCH_NEXT,
                       (UCHAR FAR *) &szDSN, MAX_DSN_LENGTH, &cbDSN,
                       (UCHAR FAR *) &szDescription,MAX_DSN_DESC_LENGTH,
                        &cbDescription) != SQL_NO_DATA_FOUND
                       &&retcode!=SQL_ERROR)

             {
                  pList->AddTail(szDSN);
             }

          SQLFreeEnv(hEnv);
          if (retcode==SQL_ERROR)
            return FALSE;

          return TRUE;
      }

Additional query words:

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Keywords          : kbcode kbProgramming kbDatabase kbMFC kbODBC kbVC kbVC200 kbVC210 kbVC220 kbVC400 kbVC500 kbVC600 kbGrpDSVCDB kbGrpDSMDAC kbDSupport kbMDAC200 kbMDAC150 kbMDAC210 kbMDAC250 kbMDAC260 kbmdac270 
Technology        : kbAudDeveloper kbMFC
Version           : :1.5,1.51,1.52,2.0,2.1,2.2,2.5,2.6,2.7,4.0,4.1,4.2,5.0,6.0
Issue type        : kbhowto

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