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?

I do not think that IDP supports parallel downloads. Why do you think it does? — Martin Prikryl, Oct 11 '19 at 05:26
@MartinPrikryl then how to download multiple files one after another? any help.. — , Oct 11 '19 at 05:46
nope it is not happening! second file starts downloading before the first one finishes. — , Oct 11 '19 at 05:52
i used `idpStopDownload` and `idpStartDownload` as well but no luck. — , Oct 11 '19 at 05:54
yes, screenshot has been attached above, please have a look and the status is `cannot connect` — , Oct 11 '19 at 06:16
OK, I understand now. You want to download one file, read its contents and download other files based on that. -- The problem is not that the files are not downloaded one after another - They are. -- The problem is that you incorrectly believe that your `TryGetFileLine` code happens *after* the download of he first file. It does not! All your code happens even before the wizard window appears. — Martin Prikryl, Oct 11 '19 at 06:33
yes,you are right, based on the first downloaded file's contents the second files have to download. Then how to make `TryGetFileLine` wait till it finishes downloading or any other way to read the content of the downloaded files? — , Oct 11 '19 at 06:58

Martin Prikryl · Accepted Answer · 2019-10-11T08:17:37.090

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;

Download additional files based on contents of first download using IDP

1 Answers1