how to update exe applicatio from internet ?

Posted on 2016-11-16
Last Modified: 2016-11-16
i am using this procedure to update my application from internet  , But i got problem i already can download the new exe ,, but i wanted to auto replace the old application with the new updated one  i cannot do that while the exe application is running !

the approach that i am trying to achieve is when i run my application and download the update auto restart the application with the new update one  , i don't want to duplicated Files like rename and leave the old version etc  

procedure TForm1.DownLoadNewVersion1Click(Sender: TObject);
  apath: string;
  new: Integer;
  // This is the exact code from my application
  apath           := GetPathPath;
  Gauge1.Progress := 0;
  StatusBar1.SimplePanel := True;
  StatusBar1.SimpleText := 'Connecting to';
  Gauge1.Progress := 20;
  if DownloadFile('', PChar(apath) + '/update.ini') then
    Gauge1.Progress := 50;
    StatusBAr1.SimplePanel := True;
    StatusBar1.SimpleText := 'Checking for newer versions...';
    vernfo := TiniFile.Create(GetPathPath + '/update.ini');
    new    := vernfo.ReadInteger('version', 'wsc', 7);
    if (old = new) then
      StatusBar1.SimplePanel := True;
      StatusBar1.SimpleText  := 'No new version detected';
      Gauge1.Progress        := 100;
    else if DownloadFile('',
      PChar(apath) + '/winsafe.exe') then
      ShowMessage('Update succeseful');
      Gauge1.Progress := 100;
      winsc           := TIniFile.Create(ChangeFileExt(Application.ExeName, '.ini'));
      winsc.WriteInteger('wsc', 'vernfo', new);
      MessageDlg('A new version has appeard but it requires a second install',
        mtInformation, [mbOK], 0);
    StatusBar1.SimplePanel := True;
    StatusBar1.SimpleText  := 'Failed to connect probably a internet problem';
    Gauge1.Progress        := 0;

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Question by:dolphin King
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LVL 35

Expert Comment

ID: 41889562
That's why all major software releases (think Google Chrome, Adobe Reader etc) use a separate update modules. It's just not possible to update yourself.

Author Comment

by:dolphin King
ID: 41889675
so you suggest to create a luncher to the orginal exe that need to be updated ?
LVL 35

Accepted Solution

Kimputer earned 500 total points
ID: 41889682
I suggest you start the update module (separate .exe) to update the main program (have it close the main app if it's still open).
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Author Comment

by:dolphin King
ID: 41889847
i will take your suggestion as accepted answer how ever i was thinking about something else ...
LVL 37

Expert Comment

by:Geert Gruwez
ID: 41890289
Letting an exe update itself doesnt work.
There is always a second app required which can need elevated privs.

You can lift someone except yourself

Author Comment

by:dolphin King
ID: 41890502
yes i was thinking flat . i did secondary app

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