我是套接字连接的新手, 我想向socket服务器发送一些命令,但我只能发送第一条消息而不是其他消息。
客户端:
$fp = stream_socket_client("tcp://127.0.0.1:1000", $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br />\n";
} else {
$cmd_1 = "hello";
fwrite($fp, $cmd_1);
while (!feof($fp)) {
print_r(fgets($fp, 1024));
}
$cmd_2 = "second message";
fwrite($fp, $cmd_2);
while (!feof($fp)) {
print_r(fgets($fp, 1024));
}
fclose($fp);
}
如何发送多条消息,例如第一个$cmd_1
,并且取决于结果,我必须发送$cmd_2
?
服务器
error_reporting(E_ALL);
/* Allow the script to hang around waiting for connections. */
set_time_limit(0);
/* Turn on implicit output flushing so we see what we're getting
* as it comes in. */
ob_implicit_flush();
$address = '127.0.0.1';
$port = 1000;
if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) {
echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";
}
if (socket_bind($sock, $address, $port) === false) {
echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
}
if (socket_listen($sock, 5) === false) {
echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
}
do {
if (($msgsock = socket_accept($sock)) === false) {
echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
break;
}
/* Send instructions. */
$msg = "\nWelcome to the PHP Test Server. \n" .
"To quit, type 'quit'. To shut down the server type 'shutdown'.\n";
socket_write($msgsock, $msg, strlen($msg));
do {
if (false === ($buf = socket_read($msgsock, 2048, PHP_NORMAL_READ))) {
echo "socket_read() failed: reason: " . socket_strerror(socket_last_error($msgsock)) . "\n";
break 2;
}
if (!$buf = trim($buf)) {
continue;
}
if ($buf == 'quit') {
break;
}
if ($buf == 'shutdown') {
socket_close($msgsock);
break 2;
}
$talkback = "PHP: You said '$buf'.\n";
socket_write($msgsock, $talkback, strlen($talkback));
echo "$buf\n";
} while (true);
socket_close($msgsock);
} while (true);
socket_close($sock);
答案 0 :(得分:0)
问题出在下面一行:
while (!feof($fp)) {
它的作用是:它等待该套接字上的EOF(通常关闭套接字)。它会为您提供第一个响应,并等待进一步响应而不发送任何进一步的请求(循环)。您想要读取您发送的每条请求消息的响应消息,对吗?
像这样修改你的代码(未经测试,但应该有效):
$cmd_1 = "hello";
fwrite($fp, $cmd_1);
print_r(fgets($fp, 1024));
$cmd_2 = "second message";
fwrite($fp, $cmd_2);
print_r(fgets($fp, 1024));
fclose($fp);
一旦从套接字读取一行, fgets(..)
将返回。你实际上并不需要一个while循环。
此外,开始为您的通信定义结构/协议是一个很好的观点。在客户端,您逐行阅读,但不是服务器。插件(在服务器上)读取可以返回部分消息。如果您决定通信结构,则可以将读取设计为在读取整个结构之前不返回。
答案 1 :(得分:0)
问题在于
if (false === ($buf = socket_read($msgsock, 2048, PHP_NORMAL_READ))) {
echo "socket_read() failed: reason: " . socket_strerror(socket_last_error($msgsock)) . "\n";
break 2;
}
而不是将其与false === ''
if ('' === ($buf = socket_read($msgsock, 2048, PHP_NORMAL_READ))) {
echo "socket_read() failed: reason: " . socket_strerror(socket_last_error($msgsock)) . "\n";
break 2;
}
否则连接过早关闭 - 请参阅此处 - http://www.php.net/manual/en/function.socket-read.php#89133