Keine Verbindung mit MS SQL-Server-2005

int cl_event::sql_open()
{


SQLHENV henv;
SQLHDBC hdbc;
SQLHSTMT hstmt;
SQLRETURN retcode;
SQLPOINTER rgbValue;
int i = 5;
rgbValue = &i;

SQLCHAR InConnStr[255]="Driver=(SQL Native Client);Server=BASE-1;Database=TESTDB;Trusted_Connection=yes;Network=dbnmpntw;";  


SQLWCHAR OutConnStr[255];
SQLSMALLINT OutConnStrLen; 

// Allocate environment handle
retcode = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);



// Set the ODBC version environment attribute
if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {

retcode = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER*)SQL_OV_ODBC3, 0); 

	// Allocate connection handle
	if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {

	retcode = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc); 

		// Set login timeout to 5 seconds
		if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {

		SQLSetConnectAttr(hdbc, SQL_LOGIN_TIMEOUT, (SQLPOINTER)(rgbValue), 0);

retcode = SQLDriverConnect( // SQL_NULL_HDBC
hdbc,
NULL,
(SQLWCHAR*)InConnStr,
_countof(InConnStr),
OutConnStr,
sizeof(OutConnStr),
&OutConnStrLen,
SQL_DRIVER_NOPROMPT ); 



		// Allocate statement handle
		if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {  

		retcode = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt); 

		// Process data
		if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {

		SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
               }
               SQLDisconnect(hdbc);
            }
            SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
         }
      }
      SQLFreeHandle(SQL_HANDLE_ENV, henv);
}
return 0;
}