php和c通过socket进行通信

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一个php编写的客户端程序和一个用c编写的服务器程序通过socket进行通信的实例

在进行编程之前，我们需要打开socket，打开方法见下：

   >gedit .bashrc
    add things as follow
    exportPATH=/usr/local/php5/bin:$PATH               //我的php安装在/usr/local/php5路径下
   >source .bashrc

然后：
1. >cd/root/php-5.2.13/ext/sockets //我的php安装包放在/root下
2. >phpize
3. >./configure
4. >make
5. >make install
6. >cp /usr/local/lib/php.ini/usr/local/php5/lib/php.ini
7. >vi /usr/local/php5/lib/php.ini
add things as follow:
extension_dir ="/usr/local/php5/lib/php/extensions/no-debug-non-zts-20060613/"
extension = "sockets.so"
8.>apachectl restart

好了，在重启apache后，我们就可以进行程序的编写了，这两个程序也是网上非常常见的程序，在次借用，也非常感谢程序的原创者。

1. 服务器端程序：server.c

#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

main(){
    int sock;
    struct sockaddr_in server,client;
    int recvd,snd;
    int structlength;
    char * server_ip = "128.168.10.1";
    int port = 8888;
    charrecvbuf[2000],sendbuf[2000];

    char str1[]="I have received:\n";

    memset((char *)&server,0,sizeof(server));
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = inet_addr(server_ip);
    server.sin_port = htons(port);

    memset((char *)&client,0,sizeof(client));
    client.sin_family = AF_INET;
    client.sin_addr.s_addr = htonl(INADDR_ANY);
    client.sin_port = htons(port);

    if((sock = socket (AF_INET,SOCK_DGRAM,0)) < 0){
        printf("socket create error!\n");
        exit(1);
    }
    structlength = sizeof(server);
    if( bind(sock,(struct sockaddr *)&server,structlength) < 0){
        printf("socket bind error!\n");
        perror("bind");
        exit(1);
    }

    while(1){
        structlength =sizeof(client);

        printf("waiting.......\n");
        recvd = recvfrom(sock,recvbuf,sizeof(recvbuf),0,
            (struct sockaddr *) &client,&structlength);
        if(recvd < 0){
            perror("recvfrom");
            exit(EXIT_FAILURE);
        }
        else{
            printf("received:%s\n",recvbuf);

            memset(sendbuf,0,strlen(sendbuf));
            memcpy(sendbuf,str1,strlen(str1));

            snd = sendto(sock,sendbuf,strlen(str1),0,
            (struct sockaddr *) &client,structlength);

            if(snd < 0){
            perror("sendto");
            exit(1);
            }
            printf("sendok!\n");
        }
    }
    close(sock);
}

2.客户端程序

<?php
$server_ip="128.168.10.1";
$port = 8888;
$sock=@socket_create(AF_INET,SOCK_DGRAM,0);

if(!$sock){
    echo "socket create failure";
}

if($buf=="")
    $buf="hello,how are you!\n";
if(!@socket_sendto($sock,$buf,strlen($buf),0,"128.168.10.1",8888)){
    echo "send error\n";
    socket_close($sock);
    exit();
}

$buf="";
$msg="";

if(!@socket_recvfrom($sock,$msg,256,0,&$server_ip,&$port)){
    echo "recvieve error!";
    socket_close($sock);
    exit();
}

echo trim($msg)."\n";
socket_close($sock);
?>

我们通过一个页面来调用client.php程序，可以传送自己想发送的消息