Getting the OS installed on the computer

procedure TForm1.Button1Click(Sender: TObject);
Function GetVersionName:String;
var
      Key: HKEY;
      PT: array[0..80] of Char;
      BL: DWORD;
   AFOSVersionInfo: TOSVersionInfo;
begin
result := '';
AFOSVersionInfo.dwOSVersionInfoSize := SizeOf(AFOSVersionInfo);
If GetVersionEx(AFOSVersionInfo) then
begin
      case AFOSVersionInfo.dwPlatformId of
            VER_PLATFORM_WIN32s: result := 'Win32s';
            VER_PLATFORM_WIN32_WINDOWS:
            begin
                  case AFOSVersioninfo.dwMinorVersion of
                        0:    result := 'Windows 95';
                        10:   result := 'Windows 98';
                        90:   result := 'Windows ME'
                        else result := 'Unknown Win9x';
                  end;
            end;
            VER_PLATFORM_WIN32_NT:
            begin
            IF AFOSVersionInfo.dwMajorVersion <= 4 then
                     Result := 'Windows NT' else begin
                     case AFOSVersioninfo.dwMinorVersion of
                             0: result := 'Windows 2000';
                             1: result := 'Windows XP';
                          end;
            RegOpenKeyEx( HKEY_LOCAL_MACHINE,
                              'SYSTEM\CurrentControlSet\Control\ProductOptions',
                              0, KEY_QUERY_VALUE, Key );
            RegQueryValueEx(Key, 'ProductType', nil, nil,@PT, @BL);
            RegCloseKey(Key);
            if AnsiCompareText('WINNT', PT) = 0 then
            Result := result + ' Professional';
            if AnsiCompareText('LANMANNT', PT) = 0 then
            Result := Result +' Server';
            if AnsiCompareText('SERVERNT', PT) = 0 then
            Result := Result+' Advanced Server';
            End;
      End;
      end;
end;
end;
begin
SHOWMESSAGE(GETVERSIONNAME);
end;

F68 ;-)

Try something like this:

var
// Global OS vars
VersionInfo: TOSVersionInfo;
Platform: string;
MajorVersion,MinorVersion,Build: DWORD;

procedure GetOSVersion;
begin
VersionInfo.dwOSVersionInfoSize := SizeOf(VersionInfo);
GetVersionEx(VersionInfo);

with VersionInfo do
begin
case dwPlatformId of
VER_PLATFORM_WIN32s: Platform := '3.1';
VER_PLATFORM_WIN32_WINDOWS : Platform := '98';
VER_PLATFORM_WIN32_NT:
begin
Case dwMajorVersion of
5 : Platform := '2000/NT';
else
Platform := 'NT';
end;
if dwBuildNumber > = 2500 then Platform := 'XP'
end;
end;

MajorVersion := dwMajorVersion;
MinorVersion := dwMinorVersion;
Build := dwBuildNumber;
end;
end;

Regards,

Hypoviax

Oh i forgot to say read from the platform variable to find the OS

In de jedi code library their is a very good function that knows all windows versions / service packs.

http://sourceforge.net/projects/jcl/

Regards Jacco

Hypoviax, I can´t find it. What´s it´s name ??

the way is that one posted by me...
Of course is also possible to get Service packs....tell me if you need it....

Ferruccio68, Is there a way to get what service pack is installed too ??

yes of course... wait a little....i'm implementing it...

Yeah can you help me please ?

It worked like a charme. Thanx Alot. It will work on Windows 95 too ??? You showed me just what I needed.

yes of course...look this part:
[...]
case AFOSVersionInfo.dwPlatformId of
          VER_PLATFORM_WIN32s: result := 'Win32s'; //this means win 3.1
          VER_PLATFORM_WIN32_WINDOWS:
          begin
               case AFOSVersioninfo.dwMinorVersion of
                    0:    result := 'Windows 95';
                    10:   result := 'Windows 98';
                    90:   result := 'Windows ME'
                    else result := 'Unknown Win9x';
               end;
[...]
every Windows OS type is retrieved, so Win95 too...

Thanx again Ferruccio68. When shows Advanced Server means that it´s a Windows NT Server ?

well this is what procuct type values mean:

WinNT = NT Workstation
ServerNT = NT Server
LanmanNT= NT Server (Enterprise Edition)