Question

我通过在它们之间建立套接字连接在一个客户端和服务器之间进行这个简单的聊天应用程序。我能够在同一台计算机上的两个不同终端上运行客户端和服务器。现在，我如何在两台不同的计算机上运行客户端和服务器？我尝试这样做，我给服务器机器的IP地址代替服务器程序中的localhost“127.0.0.1”。它不起作用。

有人可以告诉我如何实现这一点。另外，如何动态传递IP地址和端口号？

TCP客户端

#include<sys/socket.h>
#include<stdio.h>
#include<string.h>
#include<netdb.h>
#include<stdlib.h>

int main()
{
    char buf[100];
    int k;
    int sock_desc;
    struct sockaddr_in client;
    memset(&client,0,sizeof(client));
    sock_desc=socket(AF_INET,SOCK_STREAM,0);

    if(sock_desc==-1)
    {
        printf("Error in socket creation");
        exit(1);
    }

    client.sin_family=AF_INET;
    client.sin_addr.s_addr=INADDR_ANY;
    client.sin_port=3002;

    k=connect(sock_desc,(struct sockaddr*)&client,sizeof(client));
    if(k==-1)
    {
        printf("Error in connecting to server");
        exit(1);
    }

    while(1)
    {
        printf("\nEnter data to be send to server: ");
        fgets(buf,100,stdin);
        if(strncmp(buf,"end",3)==0)
            break;

        k=send(sock_desc,buf,100,0);
        if(k==-1)
        {
            printf("Error in sending");
            exit(1);
        }

        k=recv(sock_desc,buf,100,0);
        if(k==-1)
        {
            printf("Error in receiving");
            exit(1);
        }

        printf("Message got from server is : %s",buf);
    }
    close(sock_desc);
    exit(0);
    return 0;
}

TCP服务器

#include<sys/socket.h>
#include<stdio.h>
#include<string.h>
#include<netdb.h>
#include<stdlib.h>
int main()
{
    char buf[100];
    int k;
    socklen_t len;
    int sock_desc,temp_sock_desc;
    struct sockaddr_in server,client;

    memset(&server,0,sizeof(server));
    memset(&client,0,sizeof(client));

    sock_desc=socket(AF_INET,SOCK_STREAM,0);
    if(sock_desc==-1)
    {
        printf("Error in socket creation");
        exit(1);
    }

    server.sin_family=AF_INET;
    server.sin_addr.s_addr=inet_addr("127.0.0.1");
    server.sin_port=3002;

    k=bind(sock_desc,(struct sockaddr*)&server,sizeof(server));
    if(k==-1)
    {
        printf("Error in binding");
        exit(1);
    }

    k=listen(sock_desc,20);
    if(k==-1)
    {
        printf("Error in listening");
        exit(1);
    }

    len=sizeof(client);//VERY IMPORTANT
    temp_sock_desc=accept(sock_desc,(struct sockaddr*)&client,&len);
    if(temp_sock_desc==-1)
    {
        printf("Error in temporary socket creation");
        exit(1);
    }

    while(1)
    {
        k=recv(temp_sock_desc,buf,100,0);
        if(k==-1)
        {
            printf("Error in receiving");
            exit(1);
        }

        printf("Message got from client is : %s",buf);
        printf("\nEnter data to be send to client: ");

        fgets(buf,100,stdin);
        if(strncmp(buf,"end",3)==0)
            break;

        k=send(temp_sock_desc,buf,100,0);
        if(k==-1)
        {
            printf("Error in sending");
            exit(1);
        }
    }
    close(temp_sock_desc);

    exit(0);
    return 0;
}

Answer 1

您的客户端sockaddr_in和服务器sockaddr_in相反。客户端sockaddr_in结构应为：

client.sin_family=AF_INET;
client.sin_addr.s_addr=inet_addr("add server ip here");
client.sin_port=3002;

服务器sockaddr_in结构应为：

server.sin_family=AF_INET;
server.sin_addr.s_addr=INADDR_ANY;
server.sin_port=3002;

现在您的服务器仅在环回时绑定，而您的客户端连接到INADDR_ANY。

客户端服务器聊天应用程序c

1 个答案: