Linux下C语⾔socket通信实现发送读取的⽂件内容--简单实现代
码
本次代码涉及到的内容：socket通讯，⽂件读取
读取的⽂件以及⽂件位置：
要读取的⽂件和c⽂件在同⼀个⽬录下。客户端（client）读取的是l，服务端（server）读取的是23.xml。
头⽂件（ mysocket.h）：
1/* File Name: mysocket.h*/
2 #include<stdio.h>
3 #include<stdlib.h>
4 #include<string.h>
5 #include<errno.h>
6 #include<sys/types.h>
7 #include<sys/socket.h>
8 #include<netinet/in.h>
9
10/*
11FunName:getFileAll
12 Desc:get the file content
13 Para:[fname] filename pointer
14 Return:1.[*pBuf] file content pointer
15 2.[*length] file length
16*/
17char *getFileAll(char *fname,int *length)
18 {
19int fileLight = 0;
20char *pBuf; //定义⽂件指针
21 FILE *pFile;
22
23 pFile = fopen(fname,"r"); //获取⽂件的指针
24if(pFile == NULL)
25 {
26 printf("\nOpen file %s fail\n",pFile);
27return NULL;
28 }
29
30 fseek(pFile,0,SEEK_END); //把指针移动到⽂件的结尾，获取⽂件长度
31 fileLight = ftell(pFile); //获取⽂件长度
32 pBuf =(char *)malloc(fileLight);
33 rewind(pFile); //把指针移动到⽂件开头因为我们⼀开始把指针移动到结尾，如果不移动回来会出错
34 fread(pBuf,1,fileLight,pFile); //读⽂件
35 pBuf[fileLight]=0; //把读到的⽂件最后⼀位写为0 要不然系统会⼀直寻到0后才结束
36 fclose(pFile); // 关闭⽂件
37 *length = fileLight;
38return pBuf;
39 }
服务端（cservice.c）：
1/* File Name: cservice.c */
2 #include "mysocket.h"
3
4#define DEFAULT_PORT 8000 //监听端⼝号
5#define MAXLINE 4096
6
7int main(int argc, char** argv)
8 {
9int socket_fd, connect_fd;
10int length; //file content Light
11struct sockaddr_in servaddr;
12char buff[4096];
13int n;
14char *p;
15char *fname="./23.xml";
16if( (socket_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ) //初始化Socket
17 {
18 printf("create socket error: %s(errno: %d)\n",strerror(errno),errno);
19 exit(0);
20 }
21//初始化
22 memset(&servaddr, 0, sizeof(servaddr));
23 servaddr.sin_family = AF_INET;
24 servaddr.sin_addr.s_addr = htonl(INADDR_ANY); //IP地址设置成INADDR_ANY，让系统⾃动获取本机的IP地址。
25 servaddr.sin_port = htons(DEFAULT_PORT); //设置的端⼝为DEFAULT_PORT
26
27if( bind(socket_fd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == -1) //将本地地址绑定到所创建的套接字上
28 {
29 printf("bind socket error: %s(errno: %d)\n",strerror(errno),errno);
30 exit(0);
31 }
32
33if( listen(socket_fd, 10) == -1) //开始监听是否有客户端连接
34 {
35 printf("listen socket error: %s(errno: %d)\n",strerror(errno),errno);
36 exit(0);
37 }
38 printf("======waiting for client's request======\n");
39while(1)
40 {
41if( (connect_fd = accept(socket_fd, (struct sockaddr*)NULL, NULL)) == -1) //阻塞直到有客户端连接，不然多浪费CPU资源。
42 {
43 printf("accept socket error: %s(errno: %d)",strerror(errno),errno);
44
45continue;
46 }
47
48 n = recv(connect_fd, buff, MAXLINE, 0); //接受客户端传过来的数据
49 buff[n] = '\0';
50 printf("recv msg from client:\n%s\n", buff);
51
52 p = getFileAll(fname,&length);
53if( p == NULL )
54 {
55 printf("open file error!");
56 exit(0);
57 }
58if(!fork()) //向客户端发送回应数据
59 {
60if( send(connect_fd, p, length, 0) < 0)
61 {
62 printf("send msg error: %s(errno: %d)\n", strerror(errno), errno);
63 }
64 close(connect_fd);
65 exit(0);
66 }
67 close(connect_fd);
68 }
69 close(socket_fd);
70
71 }
客户端（cclient.c）
1/* File Name: cclient.c */
2
3 #include "mysocket.h"
4
5#define MAXLINE 4096
6
7
8
9int main(int argc, char** argv)
10 {
11int sockfd, n,rec_len;
12int length; //file content Light
13int i_port = 8000; //default 8000 port
14
15char recvline[4096];
16char buf[MAXLINE];
17char *c_ipAddr = "127.0.0.1"; //ip addr
18char *p; //file content
19char *fname="./l"; //file name
20
21struct sockaddr_in servaddr;
22
23if( argc == 1)
24 {
25 printf("This client will connect server message: IP=127.0.0.1 , Port=8000 \n");
26 }
27else if( argc ==2 )
28 {
29 c_ipAddr = argv[1];
makefile phony30 printf("This client will connect server message: IP=%s , Port=8000 \n",c_ipAddr);
31 }
32else if( argc == 3)
33 {
34 c_ipAddr = argv[1];
35 i_port = atoi(argv[2]);
36 printf("This client will connect server message: IP=%s , Port=%d \n",c_ipAddr, i_port);
37 }
38else
39 {
40 printf("usage: ./client <ipaddress> and port \n");
41 exit(0);
42 }
43
44
45if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
46 {
47 printf("create socket error: %s(errno: %d)\n", strerror(errno),errno);
48 exit(0);
49 }
50
51 memset(&servaddr, 0, sizeof(servaddr));
52 servaddr.sin_family = AF_INET;
53 servaddr.sin_port = htons(i_port);
54
55if( inet_pton(AF_INET, c_ipAddr, &servaddr.sin_addr) <= 0)
56 {
57 printf("inet_pton error for %s\n",argv[1]);
58 exit(0);
59 }
60
61if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
62 {
63 printf("connect error: %s(errno: %d)\n",strerror(errno),errno);
64 exit(0);
65 }
66
67 p = getFileAll(fname,&length);
68if( p == NULL )
69 {
70 printf("open file error!");
71 exit(0);
72 }
73
74if( send(sockfd, p, length, 0) < 0)
75 {
76 printf("send msg error: %s(errno: %d)\n", strerror(errno), errno);
77 exit(0);
78 }
79if((rec_len = recv(sockfd, buf, MAXLINE,0)) == -1)
80 {
81 perror("recv error");
82 exit(1);
83 }
84
85 buf[rec_len] = '\0';
86 printf("Received :\n%s\n",buf);
87 close(sockfd);
88 exit(0);
89 }
makefile：
1 all: server client
2 .PHONY:all
3
4 client:client.o
5 gcc client.o -o client
6 client.o:cclient.c
7 gcc -c cclient.c -o client.o
8 server:server.o
9 gcc server.o -o server
10 server.o:cservice.c
11 gcc -c cservice.c -o server.o
12
13 .PHONY:clean
14
15 clean:
16 rm -rf *.o
17 rm -rf server client
1 <field name="l" value="123"/>
2 <field name="123test" value="123test"/>
1 <body>
2 <name>server</name>
3 </body>
编译：
执⾏ make 命令就会有 client，server 了。在两个窗⼝分别执⾏如下结果：
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