How to get an output of an Exec'ed program in Inno Setup?

Question

Is it possible to get an output of an Exec'ed executable?

I want to show the user an info query page, but show the default value of MAC address in the input box. Is there any other way to achieve this?

Answer 1

Yes, use redirection of the standard output to a file:

[Code]

function NextButtonClick(CurPage: Integer): Boolean;
var
  TmpFileName, ExecStdout: string;
  ResultCode: integer;
begin
  if CurPage = wpWelcome then begin
    TmpFileName := ExpandConstant('{tmp}') + '\ipconfig_results.txt';
    Exec('cmd.exe', '/C ipconfig /ALL > "' + TmpFileName + '"', '', SW_HIDE,
      ewWaitUntilTerminated, ResultCode);
    if LoadStringFromFile(TmpFileName, ExecStdout) then begin
      MsgBox(ExecStdout, mbInformation, MB_OK);
      { do something with contents of file... }
    end;
    DeleteFile(TmpFileName);
  end;
  Result := True;
end;

Note that there may be more than one network adapter, and consequently several MAC addresses to choose from.