Question

我正在尝试编写一个简单的客户端 - 服务器单向聊天（仅用于学习目的），但我一开始就陷入困境。这些是服务器和客户端的代码

服务器：

#include <stdio.h>      /* for printf() and fprintf() */
#include <sys/socket.h> /* for socket(), bind(), and connect() */
#include <arpa/inet.h>  /* for sockaddr_in and inet_ntoa() */
#include <netinet/in.h>
#include <stdlib.h>     /* for atoi() and exit() */
#include <string.h>     /* for memset() */
#include <unistd.h>     /* for close() */
#include <stdio.h>  /* for perror() */
#include <stdlib.h> /* for exit() */
#include <string.h>

#define MYPORT 3490

int main(int argc, char *argv){

struct sockaddr_in my_addr;
struct sockaddr_in cli_addr;
int sockfd;
int newsockfd;
socklen_t clilen;
int n;
char client_message[2000];

//socket declaration
sockfd = socket(AF_INET, SOCK_STREAM, 0);

//filling struct
my_addr.sin_family=AF_INET;
my_addr.sin_port=htons(MYPORT);
my_addr.sin_addr.s_addr=INADDR_ANY;
memset(& (my_addr.sin_zero), '0', 8);

//binding socket to address and port
if(bind(sockfd, (struct sockaddr *)& my_addr, sizeof(my_addr))<0)
    printf("Bind error");

//listening on the socket
listen(sockfd, 5);
printf("Waiting for connection...\n");
clilen = sizeof(cli_addr);

//accepting connection
if (newsockfd = accept(sockfd, (struct sockaddr *)& cli_addr, &clilen) <0){  
    printf("Unable to connect\n");
}
else
{
    printf("Connected with %s\n", inet_ntoa(cli_addr.sin_addr));
}

 while( (n = recv(newsockfd , client_message , 2000 , 0)) > 0 )
    {

        printf(client_message);
    }

 if(n == 0)
    {
        printf("Client disconnected");
    }
    else if(n == -1)
    {
        printf("recv failed");
    }

}

客户端：

#include <stdio.h>      /* for printf() and fprintf() */
#include <sys/socket.h> /* for socket(), bind(), and connect() */
#include <arpa/inet.h>  /* for sockaddr_in and inet_ntoa() */
#include <netinet/in.h>
#include <stdlib.h>     /* for atoi() and exit() */
#include <string.h>     /* for memset() */
#include <unistd.h>     /* for close() */
#include <string>

int main(int argc, char * argv[]){

int n;
int client;
int dest_port = 3490;
char buffer[1000];

struct sockaddr_in server_addr;

client = socket(AF_INET, SOCK_STREAM, 0);
printf("Socket created\n");

server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(dest_port);
server_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
memset(&(server_addr.sin_zero),'0',8);

if(connect(client, (struct sockaddr*)&server_addr, sizeof(server_addr))<0)
    printf("Connection error");
printf("Connected with server\n");

 while(1)
    {
        printf("Enter message : ");
        scanf("%s" , buffer);

        //Send some data
        if( send(client , buffer , strlen(buffer) , 0) < 0)
        {
            printf("Send failed");
            return 1;
        }
    }
}

服务器输出如下：

Waiting for connection...
Connected with 127.0.0.1
recv failed

输出客户端时

Socket created
Connected with server
Enter message :

我花了几个小时阅读教程，手册页和其他内容，我真的无法解决这个问题。问题似乎并不那么复杂，所以我更加不安。此外，当尝试从服务器发送并在客户端接收时，我已经发送＆＃34;发送失败＆＃34;在服务器端。

编辑：在使用perror并找出＆socket;非套接字＆＃34;套接字操作后＃34;意思是我发现问题是

if (newsockfd = accept(sockfd, (struct sockaddr *)& cli_addr, &clilen) <0)

第一次合作＆＃34;接受......＆＃34;用＆＃34; 0＆＃34;然后将比较结果分配给newsockfd。

简单套接字聊天中没有收到数据

0 个答案: