Как получить список драйверов и источников данных, установленных на компьютере?

#include <windows.h>
#include <stdio.h>
#include <odbcinst.h>   // SQLGetInstalledDrivers()
#include <sqlext.h>     // SQLDrivers()

#pragma comment(lib, "odbc32")
#pragma comment(lib, "odbccp32")
#pragma comment(lib, "user32")

void main()
{
#define MAX_BUF 1024
    char drivers[MAX_BUF] = {0};
    char descrip[MAX_BUF] = {0};
    WORD rdriv = 0, rdesc = 0;
    //----------- Способ 1 -----------------------------------
    BOOL res = SQLGetInstalledDrivers(drivers, MAX_BUF, &rdriv);
    if(rdriv == MAX_BUF)
        printf("Too few buffer size.\n");
    char* p = drivers;
    while(*p)
    {
        printf("%s\n", p);
        p += lstrlen(p) + 1;
    }
    printf("\n");
    //----------- Способ 2 ------------------------------------
    SQLHENV hEnv;
    SQLRETURN ret;
    ret = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HENV, &hEnv);
    ret = SQLSetEnvAttr(hEnv, SQL_ATTR_ODBC_VERSION,
                            (SQLPOINTER)SQL_OV_ODBC3,
                            SQL_IS_INTEGER);
    SQLSMALLINT direction = SQL_FETCH_FIRST;
    while(1)
    {
        ret = SQLDrivers(
            hEnv, direction,
            (SQLTCHAR*)drivers, MAX_BUF, (short*)&rdriv,
            (SQLTCHAR*)descrip, MAX_BUF, (short*)&rdesc);
        if(SQL_NO_DATA == ret)
            break;
        direction = SQL_FETCH_NEXT;
        printf("* %s\n", drivers);
        p = descrip;
        while(*p)
        {
            CharToOem(p, p);
            printf("%s; ", p);
            p += lstrlen(p) + 1;
        }
        printf("\n");
    }
    SQLFreeHandle(SQL_HANDLE_ENV, hEnv);
    printf("\n");
}

#include <windows.h>
#include <stdio.h>
#include <sqlext.h>

#pragma comment(lib, "odbc32")
#pragma comment(lib, "odbccp32")
#pragma comment(lib, "user32")

void main()
{
#define MAX_BUF 1024
    char  datasrc[MAX_BUF] = {0};
    char  descrip[MAX_BUF] = {0};
    short rdsrc = 0, rdesc = 0;
    SQLHENV hEnv;
    SQLRETURN ret;
    ret = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HENV, &hEnv);
    ret = SQLSetEnvAttr(hEnv, SQL_ATTR_ODBC_VERSION,
                            (SQLPOINTER)SQL_OV_ODBC3,
                            SQL_IS_INTEGER);
    SQLSMALLINT direction = SQL_FETCH_FIRST;
    while(1)
    {
        ret = SQLDataSources(
            hEnv, direction, 
            (SQLTCHAR*)datasrc, MAX_BUF, &rdsrc,    
            (SQLTCHAR*)descrip, MAX_BUF, &rdesc);
        if(SQL_NO_DATA == ret)
            break;
        direction = SQL_FETCH_NEXT;
        CharToOem(datasrc, datasrc);
        CharToOem(descrip, descrip);
        printf("* %s (%s)\n", datasrc, descrip);
    }
    SQLFreeHandle(SQL_HANDLE_ENV, hEnv);
    printf("\n");
}