Obtain system information-user name. Computer Name, operating system name

// Obtain the user name
Updatedata ();
Char username [max_path];
Cstring strusername;
DWORD size = max_path;
: GetUserName (username, & size );
Strusername. Format ("% s", username );
M_username = strusername;
Updatedata (false );
//----------------------------------------------------------------
// Obtain the computer name
Updatedata ();
Char computername [max_path];
Cstring strcomputerusername;
DWORD size1 = max_path;
: Getcomputername (computername, & size1 );
Strcomputerusername. Format ("% s", computername );
M_computername = strcomputerusername;
Updatedata (false );
//----------------------------------------------------------------
// Obtain the computer operating system name
Updatedata ();
Hkey;
Lpctstr strkey = "SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion ";
If (error_success ==:: regopenkeyex (HKEY_LOCAL_MACHINE, strkey, null, key_all_access, & hkey ))
{
DWORD dwsize = 225, dwtype = REG_SZ;
Char string [50]; // computer operating system name
Char string1 [20]; // computer OS Version Number
// Char string2 [256]; // name of the computer operating system version
Lpcstr keyValue = "productname"; // computer operating system name
Lpcstr keyvalue1 = "CurrentVersion"; // computer OS Version Number
// Lpcstr keyvalue2 = "currentbuildname"; // name of the computer operating system version
If (error_success =: regqueryvalueex (hkey, keyValue, 0, & dwtype, (byte *) string, & dwsize) & (error_success = :: regqueryvalueex (hkey, keyvalue1, 0, & dwtype, (byte *) string1, & dwsize)/* | (error_success ==:: regqueryvalueex (hkey, keyvalue2, 0, & dwtype, (byte *) string2, & dwsize ))*/)
{
Cstring strdata = string; // computer operating system name
Cstring strdata1 = string1; // computer OS Version Number
// Cstring strdata2 = string2; // name of the computer operating system version
M_winsysname = strdata + "" + strdata1; // + "" + strdata2;
}
: Regclosekey (hkey );
}
Updatedata (false );