collect unicode values using C++ code and ODBC calls

collect unicode values using C++ code and ODBC calls:
Following is my code:
SQL database contains both ascii and unicode values in the name field.
I am not able to collect unicode values.
Can anybody please help.

Code:

#define _UNICODE
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sql.h>
#include <sqlext.h>
#include <sqlucode.h>
#include <odbcss.h>
#include<iostream.h>

void main()
{      

SQLHENV			hEnv=NULL;
SQLHDBC			hDBC=NULL;
SQLRETURN		retcode;

/* Convert the strings... */ 
//WCHAR wszDSN[] = L"myDataSource";
WCHAR wszDSN[] = L"myDataSource";
WCHAR wszUID[] = L"sa";
WCHAR wszPWD[] = L"bmcAdm1n";
WCHAR wszSqlState[SQL_SQLSTATE_SIZEW] = L"";
WCHAR wszMsg[200] = L"";


SQLHSTMT	hStmt = NULL;// Statement handle
WCHAR		szSqlStr[150]= L"select name ,default_database_name,default_language_name from sys.sql_logins" ;

	cout<<"hEnv before SQLAllocEnv = "<<hEnv<<endl;
	retcode=  SQLAllocEnv (&hEnv);
	cout<<"retcode= "<<retcode<<endl;
	cout<<"hEnv after SQLAllocEnv = "<<hEnv<<endl;
	cout<<"\n***********************\n\n";
				
				
	// Allocate memory for the connection handle
	cout<<"hDBC before SQLAllocConnect = "<<hDBC<<endl;
	retcode= SQLAllocConnect (hEnv, &hDBC);
	cout<<"retcode= "<<retcode<<endl;
	cout<<"hDBC after SQLAllocConnect = "<<hDBC<<endl;
    cout<<"\n***********************\n\n";



	retcode = SQLConnect (hDBC, wszDSN, SQL_NTS,wszUID, SQL_NTS, wszPWD, SQL_NTS);
		
	
	cout<<"retcode= "<<retcode<<endl;
	
	if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
	{	
		printf("\n------------Connected---------------\n");

			// Allocate memory for the statement handle
					cout<<"hStmt before SQLAllocStmt = "<<hStmt<<endl;
					retcode = SQLAllocStmt (hDBC, &hStmt);
					cout<<"retcode= "<<retcode<<endl;
					cout<<"hStmt after SQLAllocStmt = "<<hStmt<<endl;
					cout<<"\n***********************\n\n";
						
					
					retcode = SQLExecDirect(hStmt,szSqlStr, SQL_NTS);
					
					WCHAR       name[10],defDBnm[10],defLanguage[10];
					SDWORD      retcode2, cbname, cbdefDBnm, cbdefLanguage;
				
					
					retcode2=NULL;
					
					if (retcode2 == SQL_SUCCESS)
					{
						retcode2 = SQLBindCol(hStmt, 1, SQL_C_CHAR, name, 10, &cbname);
						retcode2 = SQLBindCol(hStmt, 2, SQL_C_CHAR, defDBnm, 10, &cbdefDBnm);
						retcode2 = SQLBindCol(hStmt, 3, SQL_C_CHAR, defLanguage, 10, &cbdefLanguage);
					}

		cout <<"\n****************************************\n";
		while (TRUE)
		{
			retcode2 = SQLFetch(hStmt);
			
			if (retcode2 == SQL_SUCCESS || retcode2 == SQL_SUCCESS_WITH_INFO)
			{
				if (cbname == SQL_NULL_DATA)               /* check null data */
					printf("\nname: NULL\n");
				else
				{
					printf("\n1Name: %s", name);
					char strBuffer[20];					
					memset (strBuffer, 0,sizeof(strBuffer));
					WideCharToMultiByte(CP_UTF8, 0, name,-1, strBuffer, 20, NULL, NULL);					
					printf("\nBuffer: %s\n", strBuffer);
				
				}
				
				if (cbdefDBnm == SQL_NULL_DATA)
					printf("defDBnm name: NULL\n");
				else
					printf("defDBnm name: %s\n", defDBnm);
				
				if (cbdefLanguage == SQL_NULL_DATA)
					printf("defLanguage: NULL\n");
				else
					printf("defLanguage : %s\n\n", defLanguage);
			}									
			else                         /* if no more data or errors returned */
				break;  
		}		
		
// Free the allocated statement handle
		SQLFreeStmt (hStmt, SQL_DROP);
		
		// Disconnect from datasource
		SQLDisconnect (hDBC);
	}                
	
    // Free the allocated connection handle
	SQLFreeConnect (hDBC);
	
    // Free the allocated ODBC environment handle
	SQLFreeEnv (hEnv);           
}