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TCP/IP Connection
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Home Backend Development PHP Tutorial socket通信 php作为客户端,C++作为服务端通信问题。

socket通信 php作为客户端,C++作为服务端通信问题。

Jun 23, 2016 pm 01:38 PM

最近想做一个如题这样的东西,现在php发送能成功,C++做出正确的相应:发送一段json字符串,但是C++发出的消息php怎么也收不到。。。不知道这是为什么。。请大家帮帮忙   难道是C++传给php的消息格式有什么问题?重点问题我感觉出在socket_read上。。但是没搞明白

<?phperror_reporting(E_ALL);set_time_limit(0);echo "<h2 id="TCP-IP-nbsp-Connection">TCP/IP Connection</h2>\n";$port = 6000;$ip = "127.0.0.1";$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);if ($socket < 0) {    echo "socket_create() failed: reason: " . socket_strerror($socket) . "\n";}else {    echo "OK.\n";}echo "试图连接 '$ip' 端口 '$port'...\n";$result = socket_connect($socket, $ip, $port);if ($result < 0) {    echo "socket_connect() failed.\nReason: ($result) " . socket_strerror($result) . "\n";}else {    echo "连接OK\n";}$in = 'r';$out ='';	if(!socket_write($socket,$in,strlen($in))) {		echo "socket_write() failed: reason: " . socket_strerror($socket) . "\n";	}else {				echo "发送到服务器信息成功!\n";		echo "发送的内容为:<font color='red'>$in</font> <br>";			}while($out = socket_read($socket,8192)) {    //echo "接收服务器回传信息成功!\n";	//$obj=json_decode($out);     //echo "接受的内容为:",$out;	echo $out;	//echo $obj->0;}/*if (false !== ($bytes = socket_recv($socket, $buf, 2048, MSG_WAITALL))) {	echo 'aa'.$buf.'aa';    echo "Read $bytes bytes from socket_recv(). Closing socket...";} else {    echo "socket_recv() failed; reason: " . socket_strerror(socket_last_error($socket)) . " ";}*/echo "关闭SOCKET...\n";socket_close($socket);echo "关闭OK\n";?>
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回复讨论(解决方案)

求不沉,大神们给些建议

php 与 C++ 的json encode是不同的,这里要处理一下。

php 将收取到的所有数据都做个日志方便调试.先确认是否没有收到信息

求不沉,大神们给些建议


我还没有做json的解析,现在只是想把json串整个弄下来,但是也出不来。。。

php 与 C++ 的json encode是不同的,这里要处理一下。


$out = socket_read($socket,8192) 我要是将这句8192改成1的话就能读出9个字符,但是读不全。。。

既然你认为是服务器端没有返回,那么似乎应该贴出你的C++服务器端的代码。

php 与 C++ 的json encode是不同的,这里要处理一下。


找到了socket_read 的错误,但是没有错误提示。。。。有没有和socket_read功能类似的函数?socket_recv我也试过。。不行

while( ($out = socket_read($socket,8192))!== false){
}
这里先去掉因为读到空格字符的因素

while(true) {
$out = socket_read($socket,8192);

socket_read 会返回收到的任何数据,包括空串
因此你不要不断的去读,而不是读一次就结束

当然由于循环变成了死循环后,你需要做一个跳出循环的约定

while( ($out = socket_read($socket,8192))!== false){
}
这里先去掉因为读到空格字符的因素




while(true) {
$out = socket_read($socket,8192);

socket_read 会返回收到的任何数据,包括空串
因此你不要不断的去读,而不是读一次就结束

当然由于循环变成了死循环后,你需要做一个跳出循环的约定


恩,我作了跳出循环的约定,就是要把socket_read($socket,8192)改成socket_read($socket,1)才能读,而且读的支离破碎,请这到底是为什么。。。。

你没有明白我的意思!
socket_read 是不能作为循环终止的条件的
比如 while(socket_read($socket,1)),一旦读到 php 认为是“空”的字符(empty 返回真的那些字符)时就会终止循环,造成数据不全
而 while(socket_read($socket,8192)) 时,如果一直没有收到终止符 \0、\r、\n 则永远停在等待输入的情况下
当然也有可能一开始就读到上一轮剩余的空字符,而根本进不了循环体

既然你在循环结束后有 echo "关闭SOCKET...\n";
不妨改作 echo "$out 关闭SOCKET...\n";
看看能输出什么

你没有明白我的意思!
socket_read 是不能作为循环终止的条件的
比如 while(socket_read($socket,1)),一旦读到 php 认为是“空”的字符(empty 返回真的那些字符)时就会终止循环,造成数据不全
而 while(socket_read($socket,8192)) 时,如果一直没有收到终止符 \0、\r、\n 则永远停在等待输入的情况下
当然也有可能一开始就读到上一轮剩余的空字符,而根本进不了循环体

既然你在循环结束后有 echo "关闭SOCKET...\n";
不妨改作 echo "$out 关闭SOCKET...\n";
看看能输出什么


我明白你的意思,我把代码改成了这样,但是就像我说的,只有$out=socket_read($socket,1);才行,如果$out=socket_read($socket,8192)就是死循环,一直等待,什么都输出不了。。即使之前的那些输出信息也是输出不了的
do {	$out=socket_read($socket,1);	$data.=$out;}while(true);echo $data;
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do {	$out=socket_read($socket,8192);	if($out=="E") break;	$data.=$out;}while(true);echo $data;
Copy after login

刚才代码粘错了,应该是这样的,我在服务端加了一个字符串最后加了字母E

那不就是 如果一直没有收到终止符 \0、\r、\n 则永远停在等待输入 的情况了
这说明服务端没有发送结束符(也就是没有遵守约定)
你也只能连接 socket_read($socket,1) 的结果了
其实读一块和读一个字节的效率是一样的(都是从输入缓冲区读的)

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