CString strSQLSrvName;//
    HKEY hKEY; 
    LPCTSTR data_Set="SOFTWARE\\Microsoft\\MSSQLServer\\MSSQLServer\\CurrentVersion\\"; 
    long ret0=(::RegOpenKeyEx(HKEY_LOCAL_MACHINE,data_Set, 0, KEY_READ, &hKEY)); 
    if(ret0 == ERROR_SUCCESS)  
    {        
        LPBYTE owner=new BYTE[80]; 
        DWORD type=REG_SZ ; DWORD dData=80;  
        long ret=::RegQueryValueEx(hKEY, "RegisteredOwner", NULL,&type, owner, &dData); 
        if(ret == ERROR_SUCCESS)     
            strSQLSrvName=CString(owner); 
        delete[] owner;
        AfxMessageBox("Your SQL SERVER's name is:"+strSQLSrvName);    }
    ::RegCloseKey(hKEY); 
//就不解说了吧，拿去运行一下就知道了~