Download additional files based on contents of first download using IDP

Question

Want to download files based on contents of first download using Inno Download Plugin (IDP). How to do that?

Here is my code

[Code]
procedure InitializeWizard();
var
  line: string;
  line2: string;
  url: string;
  appname: string;
begin
  idpAddFile('http://download.website.com/files.txt', ExpandConstant('{tmp}\files.txt'));
  idpDownloadAfter(wpReady);
  TryGetFileLine(expandConstant('{tmp}\files.txt'), 0, line);
  TryGetFileLine(expandConstant('{tmp}\files.txt'), 1, line2);
  url := line;
  appname := line2;    
  idpAddFile(url, ExpandConstant('{tmp}\'+appname));
  idpDownloadAfter(wpReady);
end;

Here second file starts downloading before the first file finishes. So how to make it one after another?

Answer 1

Tell IDP to only download the list initially. Then wait for the download to finish (for that see Running a program after it is downloaded in Code section in Inno Setup) and based on the results, create new download list and restart the download.

var
  ListDownloaded: Boolean;

procedure InitializeWizard();
begin
  idpAddFile('http://www.example.com/files.txt', ExpandConstant('{tmp}\files.txt'));
  idpDownloadAfter(wpReady);
  ListDownloaded := False;
end;

function NextButtonClick(CurPageID: Integer): Boolean;
var
  Url, AppName: string;
begin
  Result := True;
  if CurPageID = IDPForm.Page.ID then
  begin
    if not ListDownloaded then
    begin
      TryGetFileLine(ExpandConstant('{tmp}\files.txt'), 0, Url);
      TryGetFileLine(ExpandConstant('{tmp}\files.txt'), 1, AppName);

      idpClearFiles;
      idpAddFile(Url, ExpandConstant('{tmp}\' + AppName));
      idpFormActivate(nil); { This restarts the download }
      Result := False;
      ListDownloaded := True;
    end;
  end;
end;