socket
一開始先參考此篇，雖然講解不錯，但範例server會有segment fault
https://puremonkey2010.blogspot.tw/2012/07/networkprg-tcp-clientserver.html
再來可看此篇http://www.linuxhowtos.org/C_C++/socket.htm 範例可以跑
0.
int sock0;
struct sockaddr_in addr;
struct sockaddr_in client;
socklen_t len;
int sock_client;1.
/* 製作 socket */
sock0 = socket(AF_INET, SOCK_STREAM, 0);http://baike.baidu.com/item/SOCK\_STREAM
2.
/* 設定 socket */
addr.sin_family = AF_INET;
addr.sin_port = htons(12345);
addr.sin_addr.s_addr = INADDR_ANY;
bind(sock0, (struct sockaddr*)&addr, sizeof(addr));
printf("\t[Info] binding...\n");利用步驟0第二行宣告的 addr ，設定struct內的屬性
http://www.360doc.com/content/12/0222/10/54470_188560773.shtml
3.
listen(sock0, 5);
printf("\t[Info] listening...\n");http://stenlyho.blogspot.tw/2008/08/socket-listen.html
以上範例均無處理錯誤
完整包含錯誤處理參考如下
http://www.linuxhowtos.org/data/6/server.c
使用c 的server.c
/* A simple server in the internet domain using TCP
The port number is passed as an argument */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno;
socklen_t clilen;
char buffer[256];
struct sockaddr_in serv_addr, cli_addr;
int n;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr,
&clilen);
if (newsockfd < 0)
error("ERROR on accept");
bzero(buffer,256);
n = read(newsockfd,buffer,255);
if (n < 0) error("ERROR reading from socket");
printf("Here is the message: %s\n",buffer);
n = write(newsockfd,"I got your message",18);
if (n < 0) error("ERROR writing to socket");
close(newsockfd);
close(sockfd);
return 0;
}#Windows C++ web server簡單範例
#include <winsock2.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define DEFAULT_PORT 8080
void error_die(const char *s)
{
fprintf(stderr, "Error: %s failed with error %d\n", s, WSAGetLastError());
WSACleanup();
exit(EXIT_FAILURE);
}
int main(int argc, char **argv)
{
char response[] = "HTTP/1.1 200 OK\r\n"
"Content-Type: text/html; charset=UTF-8\r\n\r\n"
"<!DOCTYPE html><html><head><title>Hello World</title></head>"
"<body><h1>Hello world!</h1></body></html>\r\n";
char buf[4096];
int msg_len, addr_len;
struct sockaddr_in local, client_addr;
SOCKET sock, msg_sock;
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) == SOCKET_ERROR)
{
fprintf(stderr, "WSAStartup failed with error %d\n", WSAGetLastError());
WSACleanup();
return -1;
}
// Fill in the address structure
local.sin_family = AF_INET;
local.sin_addr.s_addr = INADDR_ANY;
local.sin_port = htons(DEFAULT_PORT);
sock = socket(AF_INET, SOCK_STREAM, 0); //TCP socket
if (sock == INVALID_SOCKET)
error_die("socket()");
if (bind(sock, (struct sockaddr *)&local, sizeof(local)) == SOCKET_ERROR)
error_die("bind()");
if (listen(sock, 5) == SOCKET_ERROR) // wait for connection
error_die("listen()");
printf("Waiting for connection...\n");
while (1)
{
addr_len = sizeof(client_addr);
msg_sock = accept(sock, (struct sockaddr*)&client_addr, &addr_len);
if (msg_sock == INVALID_SOCKET || msg_sock == -1)
error_die("accept()");
printf("Accepted connection from %s, port %d\n", inet_ntoa(client_addr.sin_addr), htons(client_addr.sin_port));
msg_len = recv(msg_sock, buf, sizeof(buf), 0);
printf("Bytes Received: %d, message: %s from %s\n", msg_len, buf, inet_ntoa(client_addr.sin_addr));
msg_len = send(msg_sock, response, sizeof(response)-1 , 0);
if (msg_len == SOCKET_ERROR)
error_die("send()");
if (!msg_len)
{
printf("Client closed connection\n");
closesocket(msg_sock);
WSACleanup();
return -1;
}
closesocket(msg_sock);
}
WSACleanup();
}編譯
g++ test.cpp -o test -lws2_32
然後執行
test#Linux socket
http://advancedlinuxprogramming.com/listings/chapter-11/server.c
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