Question

In this question is mentioned the wcrypt2.

What I need is simply calculate the MD5 of a file. It would be perfect if I could calculate it without having to save it because it is a downloaded file in stream format.

I would like to have the most straightforward way to do that.

Thanks!

Answer 1

Here is a working code for Indy 10:

function MD5File(const FileName: string): string;
var
  IdMD5: TIdHashMessageDigest5;
  FS: TFileStream;
begin
 IdMD5 := TIdHashMessageDigest5.Create;
 FS := TFileStream.Create(FileName, fmOpenRead or fmShareDenyWrite);
 try
   Result := IdMD5.HashStreamAsHex(FS)
 finally
   FS.Free;
   IdMD5.Free;
 end;
end;

Regards,
OscaR1