Win32 - forked process doesn't create a Window
From: RL (lrlemieux_at_hotmail.com)
Date: 02/02/04
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Date: Sun, 1 Feb 2004 20:35:28 -0500
Hello Perl gurus,
1. I have a web page where I can push a button (dospawn.html).
2. This button calls a CGI script (spawnboss.cgi)
3. spawnboss.cgi calls a forking perl script (forkme.pl)
4. forkme.pl calls the process creation script (createme.pl)
5. createme.pl creates my notepad.exe process, but no window shows up on my
PC.
The result on my web browser is:
SPAWNBOSS: Running perl forkme.pl C:\Windows\system32 notepad.exe
FORKME: Forking perl createme.pl C:\Windows\system32 notepad.exe
CREATEME: Starting C:\Windows\system32\notepad.exe
CREATEME: process notepad.exe is running
When I kill the notepad.exe from my Task Manager,
I then get on my web browser the final output:
CREATEME: process notepad.exe was ended
The only thing missing is the graphical window for NOTEPAD so I can type
into it.
Thanks for your assistance :)
Rob
Details following...
Have the latest installed version of ActivePerl 5.8.2.
The web page is on my personal Apache web server 2.0.47.
http://localhost/~test/dospawn.html
Configured for CGI with:
=====================================
LoadModule cgi_module modules/mod_cgi.so
ScriptAlias /cgi-bin/ "D:/Apps/Apache2/cgi-bin/"
UserDir "D:\Web\USERS"
<Directory "D:/Web/USERS/test/cgi-bin/">
AllowOverride None
Options ExecCGI
Order allow,deny
Allow from all
</Directory>
AddHandler cgi-script .cgi .pl
=====================================
The files are as follows:
=====================================
DOSPAWN.HTML
<html><body>
<form action="cgi-bin/spawnboss.cgi?action=spawn" method="post"
enctype="multipart/form-data">
<input type=hidden name="action" value="spawn">
<input type="submit" value="Spawn NOTEPAD">
</form>
</body></html>
=====================================
SPAWNBOSS.CGI
#!d:/apps/perl/bin/perl.exe
use CGI qw/:standard :html3/;
&spawn if (param('action') eq 'spawn'); # Spawn a process
exit;
sub spawn {
print "Content-type: text/html\n\n";
print "<HTML><BODY>\n";
$command = "perl forkme.pl C:\\Windows\\system32 notepad.exe";
print "SPAWNBOSS: Running $command<br>\n";
system("$command");
print "</BODY></HTML>\n";
return;
}
=====================================
FORKME.PL
#!d:/apps/perl/bin/perl.exe
$command = "perl createme.pl $ARGV[0] $ARGV[1]";
if ($pid = fork) {
print "FORKME: Forking $command<br>\n";
exec "$command";
die "couldn't exec $command : $!";
}
else {
die "DO_RUNME: fork failed: $!";
}
exit;
=====================================
CREATEME.PL
#!d:/apps/perl/bin/perl.exe
use Win32::Process;
use IO::Handle;
STDOUT->autoflush(1);
STDERR->autoflush(1);
sub ErrorReport{
print Win32::FormatMessage( Win32::GetLastError() );
}
print("CREATEME: Starting $ARGV[0]\\$ARGV[1]<br>\n");
Win32::Process::Create($ProcessObj,
"$ARGV[0]\\$ARGV[1]",
"$ARGV[1]",
1,
NORMAL_PRIORITY_CLASS,
"$ARGV[0]\\")|| die ErrorReport();
print("CREATEME: process $ARGV[1] is running<br>\n");
$ProcessObj->Wait(INFINITE);
print("CREATEME: process $ARGV[1] was ended<br>\n");
exit;
=====================================
The END
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