How does C++ realize the communication between socket server and client?
This article mainly explains "how C++ realizes socket server and client communication". The explanation content in this article is simple and clear, easy to learn and understand. Please follow the idea of Xiaobian and go deep into it slowly to study and learn "how C++ realizes socket server and client communication" together!
I. Server:
#include
#include
#include
#include
#include
#include
#include
#include
#include
int main(int argc, char const *argv[]) {
// 1. Create socket connection
int sock = socket(AF_INET, SOCK_STREAM, 0);
// 2. Initialize network structure
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(11115);
addr.sin_addr.s_addr = INADDR_ANY;
// 3. Set port reusable
int flag = 1, fd = -1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));
// 4. bound port
int ret = bind(sock, (struct sockaddr*)&addr, sizeof(addr));
if(ret
< 0) { perror("bind err"); close(sock); return -1; } // 5. 监听端口 listen(sock, 10); fd_set read_fdsets; while(true) { // 6. 客户端过来建立连接 int newfd = accept(sock, NULL, NULL); // 7. 接收客户端的数据 char buf[1024 + 1] = {0}; // 使用select 多路复用接收消息 FD_ZERO(&read_fdsets); // 清空fdset与所有文件句柄的联系 FD_SET(newfd, &read_fdsets); // 建立文件句柄fd与fdset的联系 struct timeval stOut; stOut.tv_sec = 10; stOut.tv_usec = 0; ret = select(newfd + 1, &read_fdsets, NULL, NULL, &stOut); if(ret >0)// fd has changed
{
if(FD_ISSET(newfd, &read_fdsets))
{
memset(buf, 0, sizeof(buf));
ret = recv(newfd, buf, sizeof(buf), 0);
if(ret < 0)
{
perror("select recv error");
exit(-1);
}
printf("[select] newfd = %d, recv buf = %s\n", newfd, buf);
}
}
else if(ret == 0) //No message is sent after the client connects, timeout
puts("timeout. ");
else
puts("select socket error. ");
}
return 0;
}
II. Client
#include
#include
#include
#include
#include
int main(int argc, char const *argv[]) {
// 1. Creating a socket connection
int sock = socket(AF_INET, SOCK_STREAM, 0);
// 2. Initialize network structure
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(11115);
addr.sin_addr.s_addr = inet_addr("127.0.0.1");
// 3. connection server
connect(sock, (struct sockaddr*)&addr, sizeof(addr));
// 4. transmit data
char sendBuf[1024 + 1] = "hello server, im client. ";
sleep(12);
send(sock, sendBuf, sizeof(sendBuf), 0);
// 5. close the connection
close(sock);
return 0;
}
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