How to determine Delphi Application Version

Question

Want to obtain Delphi Application build number and post into title bar

Answer 1

I most strongly recommend not to use GetFileVersion when you want to know the version of the executable that is currently running! I have two pretty good reasons to do this:

1. The executable may be unaccessible (disconnected drive/share), or changed (.exe renamed to .bak and replaced by a new .exe without the running process being stopped).
2. The version data you're trying to read has actually already been loaded into memory, and is available to you by loading this resource, which is always better than to perform extra (relatively slow) disk operations.

To load the version resource in Delphi I use code like this:

uses Windows,Classes,SysUtils;
var
  verblock:PVSFIXEDFILEINFO;
  versionMS,versionLS:cardinal;
  verlen:cardinal;
  rs:TResourceStream;
  m:TMemoryStream;
  p:pointer;
  s:cardinal;
begin
  m:=TMemoryStream.Create;
  try
    rs:=TResourceStream.CreateFromID(HInstance,1,RT_VERSION);
    try
      m.CopyFrom(rs,rs.Size);
    finally
      rs.Free;
    end;
    m.Position:=0;
    if VerQueryValue(m.Memory,'\',pointer(verblock),verlen) then
      begin
        VersionMS:=verblock.dwFileVersionMS;
        VersionLS:=verblock.dwFileVersionLS;
        AppVersionString:=Application.Title+' '+
          IntToStr(versionMS shr 16)+'.'+
          IntToStr(versionMS and $FFFF)+'.'+
          IntToStr(VersionLS shr 16)+'.'+
          IntToStr(VersionLS and $FFFF);
      end;
    if VerQueryValue(m.Memory,PChar('\\StringFileInfo\\'+
      IntToHex(GetThreadLocale,4)+IntToHex(GetACP,4)+'\\FileDescription'),p,s) or
        VerQueryValue(m.Memory,'\\StringFileInfo\\040904E4\\FileDescription',p,s) then //en-us
          AppVersionString:=PChar(p)+' '+AppVersionString;
  finally
    m.Free;
  end;
end;