Useful Dll for Inno Setup users

[peterf1999]

Originally Posted by altef_4

small error, if file for check not exists - error.
p.s. in attachment working module+example for those who don't know how to use this library.
p.p.s. can you provide me example how do you create callback for inno setup in delphi without CallbackCtrl.dll/InnoCallback.dll/CallbackAddr ?

type THashProgress = function(OverallProgress,FileProgress: Integer): Boolean of object;




function CheckFileSHA1(Filename,SHA1HashHex: AnsiString; PctOfTotal: integer; callback: THashProgress): integer export; stdcall;
begin
...

if not callback(FileProgress+OverallProgress,round(FileProgress*100/PctOfTotal)) then begin
      Result:=-1;
      break;
      end;
...

end;

I didn't intentionally handle the exception of TFileStream, because the file must exist.