Question

我正在尝试在perl中创建一个聊天服务器程序，其中客户端输入一些文本，服务器以输入的ASCII值的总和作为响应。但是，有一个问题。服务器正在处理数据，但客户端没有收到它。这是代码：

#!usr/bin/perl
#client.pl
use strict;
use warnings;
use IO::Socket;
$| = 1;

print "Client Program\n";

my $lp = 12000;

my $client_socket = new IO::Socket::INET (
PeerAddr => '127.0.0.1',
PeerPort => $lp,
Proto => 'tcp'
) or die "Cannot create the socket: $!\n";

print "Server connected at port $lp \n";
print "Enter the text to sent to the server: \n";
my $user_input = <>;
chomp $user_input;
print $client_socket;
$client_socket->send($user_input);
my $server_output;
$client_socket->recv($server_output, 1024);
print "ASCII Sum received: scalar(<$client_socket>)";
$client_socket->close();

客户端在发送数据后就会挂断（我可以说是因为我看到服务器程序中收到的文本。但是，在我终止客户端之前，服务器处理不会显示）。我不知道这里出了什么问题。我也可以发布服务器程序，但似乎没有任何问题。

这是服务器程序：

#!/usr/bin/perl
#server.pl
use strict;
use warnings;
use IO::Socket;
$| = 1;

print "Server Program\n";
my $lp = 12000;

my $server_socket = new IO::Socket::INET (
LocalHost => '127.0.0.1',
LocalPort => $lp,
Proto => 'tcp',
Listen => SOMAXCONN,
Reuse => 1) or die "Cannot create the socket: $!\n";
my $sum_ASCII = 0;
print "Server started at port $lp \n";
print "Press Ctrl+C to stop the server\n";
print "Waiting for client to connect.. \n";
# or die sprintf "ERROR:(%d)(%s)(%d)(+%s)", $!,$!,$^E,$^E
while (my $new_client = $server_socket->accept()) { 

my $addr = $new_client->peerhost();
my $port = $new_client->peerport();
print "Connected to client at $addr at port $port ";
while(<$new_client>) {
    print "Following is the text entered by client: \n";
    print "$_ \n";
    my $len = length($_);
    print "The length of the string is: $len\n";
    my @char_array = split(//);
    #print "@char_array";
    print "Initially sum is $sum_ASCII\n";
    for (my $i = 0; $i< $len; $i++)
    {
        print "Adding ASCII of '$char_array[$i]'.. ";
        $sum_ASCII = $sum_ASCII + ord($char_array[$i]);
        print "\t Sum = $sum_ASCII\n";
    }
    print "\n\nTotal sum of ASCII values of the all the sent characters is: $sum_ASCII\n"       
}
print "Sending the sum to the client.. \n";

my $np = 98765;
my $client_socket = new IO::Socket::INET (
PeerAddr => '127.0.0.1',
PeerPort => $np,
Proto => 'tcp'
) or die "Cannot create the socket: $!\n";
print "Client connected at port $np \n";
$client_socket->send($sum_ASCII);
$client_socket->close();

print "\nClient now disconnecting..\n";
close $new_client;  
print "\nWaiting for new client to connect.. \n";

}

#my $np = 12345
#my $client_socket = new IO::Socket::INET (
#LocalAddr => '127.0.0.1',
#PeerPort => $np,
#Proto => 'tcp'
#) or die "Cannot create the socket: $!\n";

#print "Client connected at port $np \n";

#$client_socket->send($sum_ASCII);
#$client_socket->close();
#print "Enter the text to sent to the server: \n";
#my $user_input = <>;
#chomp $user_input;
#print $client_socket;
#$new_client->send($sum_ASCII);

$server_socket->close();

Answer 1

我不知道Perl中的Socket工作原理。但是看看你的代码，我可以提出一些改变。

改变你的：

 print "ASCII Sum received: scalar(<$client_socket>)";

为：

   print "ASCII Sum received: " . scalar(<$client_socket>);

希望这可能会打印您的日志。

Answer 2

如果服务器与Error in perl chat server中的服务器相同，那么您的服务器将等待一个永不发送的换行符。

在您的客户端中跳过chomp $user_input;或使用

读取数据

my $data;
my $retval = $new_client->recv($data, 1024);
print "Following is the text entered by client: $data\n";
$new_client->send($data);

在您的服务器中。

有关返回值的说明，请参阅recv。

在您的客户端中，您必须将输出更改为

my $server_output;
$client_socket->recv($server_output, 1024);
print "ASCII Sum received: $server_output\n";

Perl聊天服务器客户端挂起

2 个答案: