Author: William Gerbert 

Extract and display version info from files

Answer:

This routine shows how to retrieve version information from the Windows resources 
and displays it with a ShowMessage box:
1   
2   procedure TForm1.GetVersionInfo;
3   const
4     n_Info = 10;
5     InfoStr: array[1..n_Info] of string =
6     ('CompanyName', 'FileDescription', 'FileVersion', 'InternalName',
7       'LegalCopyright', 'LegalTradeMarks', 'OriginalFilename',
8       'ProductName', 'ProductVersion', 'Comments');
9   var
10    Info: string;
11    BuffSize,
12      Len, i: Integer;
13    Buff: PChar;
14    Value: PChar;
15  begin
16    Info := Application.ExeName;
17    BuffSize := GetFileVersionInfoSize(PChar(Info), BuffSize);
18    if BuffSize > 0 then
19    begin
20      Buff := AllocMem(BuffSize);
21      Memo1.Lines.Add('FileVersionInfoSize=' + IntToStr(BuffSize));
22      GetFileVersionInfo(PChar(Info), 0, BuffSize, Buff);
23      Info := Info + ':';
24      for i := 1 to n_Info do
25        if VerQueryValue(Buff, PChar('StringFileInfo\040904E4\' +
26          InfoStr[i]), Pointer(Value), Len) then
27          Info := Info + #13 + InfoStr[i] + '=' + Value;
28      FreeMem(Buff, BuffSize);
29      ShowMessage(Info);
30    end
31    else
32      ShowMessage('No FileVersionInfo found');
33  end;