C双向客户端服务器示例[重复]

Question

我对套接字相当陌生，并且了解服务器客户端关系的要点。我只是想知道客户端是否有某种方式可以在c中向服务器返回响应。

我在想，我应该使用相同的套接字连接，还是在我的客户端中创建另一个文件描述符以将其发送到我的服务器。还有没有更好的方法来实现这一点？

主要目标是进行双向通信。

我在下面提供了我的示例代码：

服务器：

void connection(char* sentMessage){
int listenfd = 0, connfd = 0;
struct sockaddr_in serv_addr; 

char sendBuff[1025];
time_t ticks; 

listenfd = socket(AF_INET, SOCK_STREAM, 0);
memset(&serv_addr, '0', sizeof(serv_addr));
memset(sendBuff, '0', sizeof(sendBuff)); 

serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(5000); 

bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)); 

listen(listenfd, 10); 

while(1)
{
    connfd = accept(listenfd, (struct sockaddr*)NULL, NULL); 

    ticks = time(NULL);
    snprintf(sendBuff, sizeof(sendBuff), "%.90s\r\n", sentMessage);
    write(connfd, sendBuff, strlen(sendBuff)); 
    printf("Snoopy Detected: %s", sendBuff);

    close(connfd);
    sleep(1);
 }
}

int main(int argc, char *argv[])
{
//construct a string to pass to the client
char* protocol = "eax:valuevlaue, ebx:asdjasdjasd, ecx:sadafw, edx:asdfsasd";

connection(protocol);
}

客户：

int main(int argc, char *argv[])
{
int sockfd = 0, n = 0;
char recvBuff[1024];
struct sockaddr_in serv_addr; 

if(argc != 2)
{
    printf("\n Usage: %s <ip of server> \n",argv[0]);
    return 1;
} 

memset(recvBuff, '0',sizeof(recvBuff));
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
    printf("\n Error : Could not create socket \n");
    return 1;
} 

memset(&serv_addr, '0', sizeof(serv_addr)); 

serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(5000); 

if(inet_pton(AF_INET, argv[1], &serv_addr.sin_addr)<=0)
{
    printf("\n inet_pton error occured\n");
    return 1;
} 

if( connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
{
   printf("\n Error : Connect Failed \n");
   return 1;
} 

while ( (n = read(sockfd, recvBuff, sizeof(recvBuff)-1)) > 0)
{
    recvBuff[n] = 0;
    printf("Input: %s\n", recvBuff);
    //parse it into eax, and such

    char input[4][40];        
    char *ch;
    int i = 0;
    ch = strtok(recvBuff, ",");
    while (ch != NULL) {
        strcpy(input[i], ch);
        ch = strtok(NULL, " ,");
        i++;
    }

    //
    // After this, do what you'd like with the input from donor
    // And return the result back to the server
    //

    int j;
    for(j = 0; j < 4 ; j++){
        printf("%s\n", input[j]);
    }
} 

if(n < 0)
{
    printf("\n Read error \n");
} 

return 0;
} 

Answer 1

哦，我做到了！

显然，套接字本质上是双向的，所以我所要做的就是将write() 返回到sockfd 并从服务器端读取它！