一个很基础的tcp客户端和服务器代码。

01

#include <stdio.h>

02

#include <stdlib.h>

03

#include <string.h>

04

#include <sys/socket.h>

05

#include <netinet/in.h>

06

#include <arpa/inet.h>

07

08

//tcp客户端

09

int

main()

10

{

11

//1. 准备socket

12

int

sockfd=socket(PF_INET,SOCK_STREAM,0);

13

if

(sockfd==-1)

perror

(

""

),

exit

(-1);

14

//2. 准备地址

15

struct

sockaddr_in addr;

16

addr.sin_family = PF_INET;

17

addr.sin_port = htons(8888);       

18

inet_aton(

"127.0.0.1"

,&addr.sin_addr);

19

//3.连接

20

int

res = connect(sockfd,

21

(

struct

sockaddr*)&addr,

sizeof

(addr));

22

if

(res==-1)

perror

(

"连接失败"

),

exit

(-1);

23

printf

(

"连接成功\n"

);

24

//4.通信

25

send(sockfd,

"Hello！服务器"

, 12, 0);  

26

char

buf[100] = {};

27

recv(sockfd, buf,

sizeof

(buf), 0);

28

printf

(

"服务说:%s\n"

, buf);

29

//5.关闭

30

close(sockfd);

31

}

01

#include <stdio.h>

02

#include <stdlib.h>

03

#include <string.h>

04

#include <sys/socket.h>

05

#include <netinet/in.h>

06

#include <arpa/inet.h>

07

#include <time.h>

08

09

//tcp服务器端

10

int

main()

11

{

12

//1. 准备socket

13

int

sockfd=socket(PF_INET,SOCK_STREAM,0);

14

if

(sockfd==-1)

perror

(

""

),

exit

(-1);

15

//2. 准备地址

16

struct

sockaddr_in addr;

17

addr.sin_family = PF_INET;

18

addr.sin_port = htons(8888);       

19

inet_aton(

"192.168.182.53"

,&addr.sin_addr);

20

//3.绑定

21

int

res = bind(sockfd,

22

(

struct

sockaddr*)&addr,

sizeof

(addr));

23

if

(res==-1)

perror

(

"绑定失败"

),

exit

(-1);

24

printf

(

"绑定成功\n"

);

25

//4.监听

26

res = listen(sockfd, 100); 

27

if

(res==-1)

perror

(

"监听失败"

),

exit

(-1);

28

printf

(

"启动监听\n"

);

29

while

(1){

30

//5.等待客户端连接

31

struct

sockaddr_in fromaddr;

32

socklen_t len =

sizeof

(fromaddr);

33

int

fd=accept(sockfd,

34

(

struct

sockaddr*)&fromaddr, &len);

35

//6.和客户端通信

36

//6.1接收客户端数据

37

char

buf[100] = {};

38

if

(recv(fd, buf,

sizeof

(buf),0)<=0)

39

perror

(

"接收数据失败"

);

40

else

{

41

printf

(

"客户端%s说:%s\n"

,

42

inet_ntoa(fromaddr.sin_addr),buf);

43

}  

44

//6.2给客户端发数据

45

memset

(buf, 0,

sizeof

(buf));

46

time_t

cur;

47

time

(&cur);

48

struct

tm

* cur_tm =

localtime

(&cur);

49

sprintf

(buf,

"%4d-%02d-%02d %02d:%02d:%02d"

,

50

cur_tm->tm_year+1900,

51

cur_tm->tm_mon+1,

52

cur_tm->tm_mday,

53

cur_tm->tm_hour,

54

cur_tm->tm_min,

55

cur_tm->tm_sec);

56

send(fd, buf,

strlen

(buf),0);

57

//7.关闭socket

58

close(fd);

59

}

60

close(sockfd);

61

}