我有两个服务器和客户端程序。我的服务器可以连接到多个客户端。但是我现在面临的问题是，我想从服务器端向客户端显示一些消息，但我无法做到这一点。服务器和客户端程序都在下面提供。我认为阻止我在客户端打印消息的语法是scanf，它使用客户端代码（while循环的第二行）。我没有得到任何有关如何在客户端连接时显示来自服务器端的消息的解决方案。
问题1：
客户端连接时我想在客户端显示的服务器端消息:(可以在new_connection_handler函数中找到）
message = "This is connection handler\n";
message = "Type something \n";
问题2：
为什么我需要在客户端使用sleep (2)？如果我不使用sleep (2)，那么我无法接收客户端客户端发送的数据。当我从客户端第二次发送内容时，数据显示。
问题3：
是否可以将客户端和服务器代码一起编写并使用命令行参数编译和运行它？
服务器代码：
#include<stdio.h>
#include<string.h> //strlen
#include<stdlib.h> //strlen
#include<sys/socket.h>
#include<arpa/inet.h> //inet_addr
#include<unistd.h> //write
#include<pthread.h> //for thread
#define MAX_CLIENTS 5
//the thread function
void *new_connection_handler(void *);
int main(int argc , char *argv[])
{
int socket_desc , client_sock , c , *new_sock;
struct sockaddr_in server , client;
//Create socket
socket_desc = socket(AF_INET , SOCK_STREAM , 0);
if (socket_desc == -1)
{
printf("Could not create socket");
}
//Prepare the sockaddr_in structure
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons( 8888 );
bzero (&server.sin_zero, 8);
//Bind
if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
{
//print the error message
perror("bind failed. Error");
return 1;
}
//Listen
listen(socket_desc , MAX_CLIENTS);
//Accept and incoming connection
printf("Waiting for incoming connections\n");
c = sizeof(struct sockaddr_in);
while( (client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) )
{
printf("Connection accepted");
pthread_t thread_id;
if( pthread_create( &thread_id , NULL , new_connection_handler , (void*) &client_sock) < 0)
{
perror("could not create thread");
return 1;
}
printf("Handler assigned\n");
}
if (client_sock < 0)
{
perror("accept failed");
return 1;
}
return 0;
}
void *new_connection_handler(void *socket_desc)
{
//Get the socket descriptor
int sock = *(int*)socket_desc;
int read_size;
char *message , client_message[2000];
//Send some messages to the client
message = "This is connection handler\n";
write(sock , message , strlen(message));
message = "Type something \n";
write(sock , message , strlen(message));
//Receive a message from client
while( (read_size = recv(sock , client_message , 2000 , 0)) > 0 )
{
//Send the message back to client
write(sock , client_message , strlen(client_message));
}
if(read_size == 0)
{
printf("Client disconnected\n");
fflush(stdout);
}
else if(read_size == -1)
{
perror("recv failed");
}
//Free the socket pointer
free(socket_desc);
return 0;
}
客户代码：
#include<stdio.h> //printf
#include<string.h> //strlen
#include<sys/socket.h> //socket
#include<arpa/inet.h> //inet_addr
int main(int argc , char *argv[])
{
int sock;
struct sockaddr_in server;
char message[1000] , server_reply[2000];
int len;
//Create socket
sock = socket(AF_INET , SOCK_STREAM , 0);
if (sock == -1)
{
printf("Could not create socket");
}
puts("Socket created");
server.sin_addr.s_addr = inet_addr("127.0.0.1");
server.sin_family = AF_INET;
server.sin_port = htons( 8888 );
//Connect to remote server
if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0)
{
perror("connect failed. Error");
return 1;
}
puts("Connected\n");
//keep communicating with server
while(1)
{
printf("Enter message : ");
scanf("%s" , message);
//Send some data
if( send(sock , message , strlen(message) , 0) < 0)
{
puts("Send failed");
return 1;
}
sleep (2);
//Receive a reply from the server
if((len = recv(sock , server_reply , 2000 , 0)) < 0)
{
puts("recv failed");
break;
}
puts("Server reply :");
server_reply [len]='\0';
printf("%s\n", server_reply);
}
close(sock);
return 0;
}
答案 0 :(得分：2)
您的帧不同步您使用服务器的两个发送打开客户端处理线程。没有你的睡眠＆＃34;，你会拿起一个，而不是另一个。你的缓冲区大小也没有被正确使用，因为它们不一致被视为终止字符串，实际上它们的发送长度基于strlen（只要它是一致的，这是好的）。 / p>
我认为这是您尝试做的事情，只需做一些修改：
客户代码
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdint.h>
int main(int argc , char *argv[])
{
int sock;
struct sockaddr_in server;
char message[1000] , server_reply[2000];
int len;
//Create socket
sock = socket(AF_INET , SOCK_STREAM , 0);
if (sock == -1)
{
printf("Could not create socket");
}
puts("Socket created");
server.sin_addr.s_addr = inet_addr("127.0.0.1");
server.sin_family = AF_INET;
server.sin_port = htons( 8888 );
//Connect to remote server
if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0)
{
perror("connect failed. Error");
return 1;
}
puts("Connected\n");
//keep communicating with server
while((len = recv(sock, server_reply, sizeof(server_reply), 0)) > 0)
{
printf("Server reply: %.*s", len, server_reply);
printf("Enter message : ");
if (fgets(message, sizeof(message), stdin) == NULL)
break;
//Send some data
if( send(sock , message , strlen(message) , 0) < 0)
{
puts("Send failed");
return 1;
}
}
close(sock);
return 0;
}
服务器代码
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<pthread.h>
#include<stdint.h>
#define MAX_CLIENTS 5
//the thread function
void *new_connection_handler(void *);
int main(int argc , char *argv[])
{
int socket_desc , client_sock;
struct sockaddr_in server , client;
socklen_t c = sizeof(client);
//Create socket
socket_desc = socket(AF_INET , SOCK_STREAM , 0);
if (socket_desc == -1)
{
printf("Could not create socket");
}
//Prepare the sockaddr_in structure
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons( 8888 );
bzero (&server.sin_zero, 8);
//Bind
if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
{
//print the error message
perror("bind failed. Error");
return 1;
}
//Listen
listen(socket_desc , MAX_CLIENTS);
//Accept and incoming connection
printf("Waiting for incoming connections\n");
c = sizeof(client);
while( (client_sock = accept(socket_desc, (struct sockaddr *)&client, &c)) )
{
printf("Connection accepted");
pthread_t thread_id;
if( pthread_create( &thread_id , NULL , new_connection_handler , (void*) (intptr_t)client_sock) < 0)
{
perror("could not create thread");
return 1;
}
printf("Handler assigned\n");
}
if (client_sock < 0)
{
perror("accept failed");
return 1;
}
return 0;
}
void *new_connection_handler(void *socket_desc)
{
//Get the socket descriptor
int sock = (intptr_t)socket_desc;
int read_size = 0;
char client_message[2000];
static const char rdy[] = "READY\n";
write(sock, rdy, sizeof(rdy)-1);
//Receive a message from client
while( (read_size = recv(sock , client_message , sizeof(client_message) , 0)) > 0 )
write(sock , client_message , read_size);
if(read_size == 0)
{
printf("Client disconnected\n");
fflush(stdout);
}
else if(read_size == -1)
{
perror("recv failed");
}
return 0;
}
这仍然需要在客户端线程上使用更好的连接逻辑，但如果您使用适当的标记粘贴和编译每个，我认为它会完成您尝试实现的目标。
祝你好运。