Windowsの自己更新EXE PAR

Question

サーバー上で新しいバージョンを検出すると、「自己更新」するスクリプトを作成しようとしています。最初は私が持っていたアイデアが、新しいバージョンが検出されたとき、ファイルをダウンロードしてから、元のEXEを新しいものと単に上書きするDOSバッチファイルを起動します。私はSytemを使うことができました（start update.bat）、その後すぐに0を終了します。.batファイルは数秒待ち、古いEXEを削除しようとします。これは失敗し、システムを使用している場合でも（開始...）、新しい「プロセス」は実際に同じプロセスであるため、これは正しいですか？WindowsのPerlから完全に新しいプロセスを起動する方法はあります。それは私が.exeを削除することができるでしょうか？それとも、より良い方法がありますか？

ありがとう、 Eric Seifert

Answer 1

See the documentation on the Windows Restart Manager, an API introduced with Windows Vista that manages restarting applications, for updates, for you.

Answer 2

Ever heard of java WebStart? There is a PAR equivalent, PAR::WebStart Basically, you configure it, then download code live from a trusted website

so your .exe would just be a frontend to PAR::WebStart, with the real program downloaded off your website

Answer 3

I know this is an old question, but I thought I'd put my solution here since I'm working on the same sort of thing. Your batch idea is the way I went, but the small change I made was to use exec() instead of system() since the former (according to this) "...executes a system command and never returns", which seems to release the running process. This appears to work both when running interpreted Perl files with Strawberry Perl, and when running compiled programs with PAR::Packer.

I've created test.pl, which was ultimately compiled to test.exe, as follows:

#!/usr/bin/perl

use 5.10.0;
use strict;
use warnings;

    my $batch_file = <<"BATCH";
rem ### IT IS SAFE TO DELETE THIS FILE ###

\@echo off
ping 127.0.0.1 -n 2 -w 1000 > nul
echo Copying over update file...
copy testfile.exe test.exe

BATCH

    open my $fh, '>', 'update.bat';
    print $fh $batch_file;
    close $fh;

    exec( 'update.bat' );

testfile.exe is a standby "upgraded" version of test.exe, just to make sure that I can overwrite test.exe while it's running, and I can. The ping is a way to pause for 2 seconds to make sure the process has had a chance to exit before trying to overwrite the file.

Oddly enough, the created batch file update.bat can't delete itself, even though batch files can normally delete themselves. If I create a batch file with this:

start /b "" cmd /c del %0

It will delete itself without any errors. But if I include that snippet in update.bat, it complains that The process cannot access the file because it is being used by another process. I'm not sure why. Since this isn't particularly important in my application, I haven't pursued this. I just leave update.bat behind and let it be overwritten next time an update occurs. But I do notate in the file that it's safe to delete in case anyone looks at it later.