在Windows上自我更新Exe Par

Question

我正在尝试创建一个在服务器上检测到新版本时将“自我更新”的脚本。最初是我所拥有的想法是，当检测到新版本时，下载文件，然后启动DOS批处理文件，只需将原始EXE覆盖新的exe。我想，我可以使用sytem（开始update.bat）然后立即退出0;.bat文件等待几秒钟，然后尝试删除旧EXE。这失败了，我猜因为即使使用系统（开始......）时，新的“进程”实际上是相同的过程，这是正确的吗？是否有任何方法可以从Windows中从Perl启动完全新的进程，这将允许我删除.exe？或者有一种不同的方法会更好吗？

谢谢， 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.