Question

I’m loading package at runtime via LoadPackage(). Let’s say after load I want to check the version of the package to ensure it’s the newest. How can I do that?

Answer 1

A package is just a special type of dll, So you can use the GetFileVersion function defined in the SysUtils unit, this function returns the most significant 32 bits of the version number. so does not include the release and/or build numbers.

{$APPTYPE CONSOLE}

{$R *.res}

uses
  System.SysUtils;

 Var
   FileVersion : Cardinal;
begin
  try
    FileVersion:=GetFileVersion('C:\Bar\Foo.bpl');
    Writeln(Format('%d.%d',[FileVersion shr 16, FileVersion and $FFFF]));
    Readln;
  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
end.

If you want retrieve the full version number (with release and build numbers included) you can use the GetFileVersionInfoSize, VerQueryValue and GetFileVersionInfo WinApi functions.

function GetFileVersionStr(const AFileName: string): string;
var
  FileName: string;
  LinfoSize: DWORD;
  lpdwHandle: DWORD;
  lpData: Pointer;
  lplpBuffer: PVSFixedFileInfo;
  puLen: DWORD;
begin
  Result := '';
  FileName := AFileName;
  UniqueString(FileName);
  LinfoSize := GetFileVersionInfoSize(PChar(FileName), lpdwHandle);
  if LinfoSize <> 0 then
  begin
    GetMem(lpData, LinfoSize);
    try
      if GetFileVersionInfo(PChar(FileName), lpdwHandle, LinfoSize, lpData) then
        if VerQueryValue(lpData, '\', Pointer(lplpBuffer), puLen) then
          Result := Format('%d.%d.%d.%d', [
            HiWord(lplpBuffer.dwFileVersionMS),
            LoWord(lplpBuffer.dwFileVersionMS),
            HiWord(lplpBuffer.dwFileVersionLS),
            LoWord(lplpBuffer.dwFileVersionLS)]);
    finally
      FreeMem(lpData);
    end;
  end;

end;