我不知道问题出在客户端还是服务器或两者。这是我的第一个客户端-服务器套接字编程代码。但这没有按预期工作。我引用的代码运行良好。
当代码运行时,客户端和服务器应该都交换 2 条消息,但它们并没有这样做。服务器正在显示“Listening”,这与预期的一样,但是当我运行客户端代码时,没有任何反应,它只是什么也不显示。
这是客户端代码
#include <stdio.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
int main() {
struct sockaddr_in mysocket, servsocket;
int err;
char buf[256];
//CREATING SOCKET
int socketstatus = socket(AF_INET, SOCK_STREAM, 0);
printf("%d\n", socketstatus);
if(socketstatus < 0){
printf("socket failed\n");
scanf("%d", &err);
return 0;
}
bzero((char *) &mysocket, sizeof(mysocket));
mysocket.sin_family = AF_INET;
mysocket.sin_addr.s_addr = inet_addr("127.0.0.2");
int port = 5674;
mysocket.sin_port = htons(port);
//CONNECT
int connectstatus = connect(socketstatus, (struct sockaddr *) &servsocket, sizeof(servsocket));
if(connectstatus < 0){
printf("Connect failed\n");
scanf("%d", &err);
return 0;
}
//SEND
bzero(buf, 256);
strcpy(buf, "Message sent by client");
int sendstatus = send(socketstatus, buf, 256, 0);
printf("2\n"); //This is not being displayed
if(sendstatus < 0){
printf("Client send failed\n");
return 0;
}
printf("Reached for receiving\n");
//RECEIVE
bzero(buf, 256);
int recvstatus = recv(socketstatus, buf, 256, 0);
if(recvstatus < 0){
printf("Client RECEIVE failed\n");
scanf("%d", &err);
return 0;
}
printf("The message client got from server is, %s \n",buf );
scanf("%d", &err);
printf("Bye");
}
这是服务器代码:
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
int main() {
int err;
struct sockaddr_in servsocket, clientsocket;
char sendmessage[256];
//CREATING SOCKET
int mysocket = socket(AF_INET, SOCK_STREAM, 0);
if(mysocket < 0){
printf("socket creation failed\n");
scanf("%d", &err);
return 0;
}
bzero((char*) &servsocket, sizeof(servsocket)); //initiazlizing servsocket with null
servsocket.sin_family = AF_INET;
servsocket.sin_addr.s_addr = inet_addr("127.0.0.2");
int port = 5674;
servsocket.sin_port = htons(port);
//BINDING
int bindstatus = bind(mysocket, (struct sockaddr*) &servsocket, sizeof(servsocket));
if(bindstatus < 0){
printf("Socket bind failed\n");
scanf("%d", &err);
return 1;
}
//LISTENING
int listenstatus = listen(mysocket, 5);
if(listenstatus < 0){
scanf("%d", &err);
return 2;
}
else
printf("LISTENING....\n");
//ACCEPTING
int clientsize = sizeof(clientsocket);
int acceptstatus = accept(mysocket, (struct sockaddr*) &clientsocket, &clientsize);
if(acceptstatus < 0){
printf("Accept failed");
scanf("%d", &err);
return 3;
}
char buf[256];
bzero(buf, 256);
//RECEIVING
int recvstatus = recv(acceptstatus, buf, 256, 0);
if(buf < 0){
printf("Error:Nothing read");
scanf("%d", &err);
return 4;
}
printf("I received this message, %s \n", buf);
printf("NOW I WILL SEND\n");
//SENDING
bzero(sendmessage, 256);
strcpy(sendmessage, "Message sent by server");
int sendstatus = send(acceptstatus, sendmessage, sizeof(sendmessage), 0);
if(sendstatus < 0){
printf("Error sending\n");
scanf("%d", &err);
return 5;
}
return 0;
}
最佳答案
在客户端代码中,您初始化了mysocket
,但将serversocket
传递给未初始化的connect
。
您应该设置 serversocket
的字段而不是 mysocket
。
关于客户端服务器通信没有发生。发送功能后不显示客户端代码,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39549586/