a section of my code:

#OS is Win2000 server
$picdir="d:\\inetpub\\wwwroot\\m_html\\news_pics\\";
use CGI;
$delfer=new CGI;
$file=$delfer->param('file');
$file=~/[\/|\\]?(\w+\.\w+)$/;
$filename=$1;
&print_error("jpg or gif please") if(($filename!~/\w+\.jpg/)&&($filena
+me!~/\w+\.gif/));
&print_error("filename less than 20") if(length($filename)>20);
&print_error("has been in existence") if(-e ("$picdir$filename"));
open(IMAGE,">$picdir$filename") || &print_error("fail to open file");
binmode IMAGE;
binmode $file;
while($bytes=read($file,$buffer,1024) ) 
{
    $sum+=$bytes;
    if ($sum> 102400)
    { 
    close IMAGE;
    unlink($picdir.$filename);
    &print_error("less than 100k");
    }
    print IMAGE $buffer;
}
close IMAGE;
unless($sum)
{
unlink($picdir.$filename);
&print_error("can not be zero");
}
sub print_error{......}
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