本文实例讲述了C语言实现socket简单通信的方法，分享给大家供大家参考。具体实现方法如下：
服务器端代码如下：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
============================================================================
Name : server.c
Author : king
Version :
Copyright : Your copyright notice
Description : Hello World in C, Ansi-style
============================================================================
*/
#include <stdlib.h>
#include <pthread.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h> /* inet(3) functions */
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
int handle(int point);
int main(void) {
int sfd, ind;
struct sockaddr_in addr;
struct sockaddr_in clent;
char resv[1024], sendbuf[1024];
char buf[1024];
char * myaddr = "192.168.231.128";
int ret; // 返回值设置
socklen_t lent;
int pid;
addr.sin_family = AF_INET; //IPv4 Internet protocols
addr.sin_port = htons(5050); //这里输入服务器端口号
addr.sin_addr.s_addr = inet_addr(myaddr);
; //INADDR_ANY表示本机IP
//獲取socket描述符，IPV4asd
printf("socket start \n");
sfd = socket(AF_INET, SOCK_STREAM, 0);
if (sfd < 0) {
printf("socket error \n");
return -1;
}
printf("bind start \n");
//将套接子与指定端口链接
if (bind(sfd, (struct sockaddr *) &addr, sizeof(struct sockaddr)) < 0) {
printf("bind error \n");
return -1;
}
//监听套接子
printf("listen start \n");
if (listen(sfd, 1024) < 0) {
printf("listen error \n");
return -1;
}
for (;;) {
//接受来自客户端的信息
printf("accept start \n");
memset(&clent, 0, sizeof(clent));
lent = sizeof(clent);
ind = accept(sfd, (struct sockaddr *) &clent, &lent);
if (ind < 0) {
printf("accept error %d \n", ind);
return -1;
}
printf("infor \n");
printf("clent addr%s porit %d\n",
inet_ntop(AF_INET, &clent.sin_addr, buf, sizeof(buf)),
ntohs(clent.sin_port));
pid = fork();
if (pid == 0) {
//子进程
close(sfd);
handle(ind);
} else if (pid < 0) {
//error
close(ind);
} else {
//父进程
}
}
return EXIT_SUCCESS;
}
int handle(int point) {
int retn;
char buf[1024];
for (;;) {
retn = read(point, buf, sizeof(buf));
if (retn < 0) {
printf("read error \n");
close(point);
break;
} else if (retn == 0) {
printf("client exit \n");
close(point);
break;
}
printf("client:%s\n", buf);
if (strcmp("exit", buf) == 0) {
printf("exit \n");
close(point);
return 0;
}
}
return 0;
}
|
客户端代码如下：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/*
============================================================================
Name : client.c
Author : king
Version :
Copyright : Your copyright notice
Description : Hello World in C, Ansi-style
============================================================================
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h> /* inet(3) functions */
int handle(int fd);
int main(void) {
int nsd;
char buf[1024];
char * myaddr = "192.168.231.128";
struct sockaddr_in addr;
printf("welcome to echo client\n");
nsd = socket(AF_INET, SOCK_STREAM, 0);
printf("connect start1 \n");
//bzero(addr, sizeof(*addr));
memset(&addr,0,sizeof(addr));
printf("connect start2 \n");
addr.sin_family = AF_INET;
addr.sin_port = htons(5050);
addr.sin_addr.s_addr=inet_addr(myaddr);
printf("connect start3 \n");
if (connect(nsd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) < 0) {
printf("connect error \n");
return -1;
}
sleep(5);
printf("handle start\n");
handle(nsd);
close(nsd);
return EXIT_SUCCESS;
}
int handle(int fd) {
char sendl[1024], rev[1024];
int retn;
for (;;) {
memset(sendl,0,sizeof(sendl));
memset(rev,0,sizeof(rev));
if (fgets(sendl, 1024, stdin) == NULL) {
break;
}
//
printf("wirte start\n");
write(fd, sendl, strlen(sendl));
read(fd, rev,strlen(rev));
}
return 0;
}
|
注意：
int connect(int sockfd, const struct sockaddr *addr,socklen_t addrlen);
记住一定是值 addrlen
accept socklen_t *addrlen要是一个指针
希望本文所述对大家C语言网络程序设计的学习有所帮助。