Socket编程作业：
在Linux系统上，用C++编两个程序：Client和Server。两个进程间利用socket进行TCP通信。
要求：
Server进程运行后，输出本进程所在主机IP地址以及正在监听的端口号；
Client进程运行后，输出提示信息，要求用户输入Server的IP地址和端口号；
Client以用户输入的参数连接到Server；
Client提示用户输入任意字符串，将该字符串通过socket传输至Server；
Server将接收到的字符串打印输出至标准输出。
client:
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<unistd.h>
#include<arpa/inet.h>
#include<sys/socket.h>
typedef struct Student
{
char name[40];
char id[40];
float gr;
}student;
typedef struct SStudent
{
char id1[40];
char id2[40];
char id3[40];
float av;
}sstudent;
int main(){
int sock = socket(AF_INET, SOCK_STREAM, 0);
int i=0,b;
char ch;
char a[30]={0};
printf("please input IP Address:");
while((ch=getchar())!='\n')
{
a[i]=ch;
i++;
}
printf("please input Port:");
scanf("%d",&b);
struct sockaddr_in serv_addr;
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr(a);
serv_addr.sin_port = htons(b);
connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
//char buffer[40];
student stu1,stu2,stu3;
sstudent ss;
while(1)
{
printf("Please write three Students name,id and grade:");
scanf("%s", stu1.name);
scanf("%s", stu1.id);
scanf("%f",&stu1.gr);
scanf("%s", stu2.name);
scanf("%s", stu2.id);
scanf("%f",&stu2.gr);
scanf("%s", stu3.name);
scanf("%s", stu3.id);
scanf("%f",&stu3.gr);
send(sock,(char*)&stu1,sizeof(student),0);
send(sock,(char*)&stu2,sizeof(student),0);
send(sock,(char*)&stu3,sizeof(student),0);
recv(sock,(char*)&ss,sizeof(sstudent),0);
printf("This three students' average grade:\n");
printf("%s\n",ss.id1);
printf("%s\n",ss.id2);
printf("%s\n",ss.id3);
printf("%f\n",ss.av);
}
/*while(1)
{
printf("Please write:");
scanf("%s", name);
scanf("%s", id);
scanf("%f",&f);
write(sock, name, sizeof(name));
write(sock, id, sizeof(id));
}*/
close(sock);
return 0;
}
server:
#include<stdio.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
typedef struct Student
{
char name[40];
char id[40];
float gr;
}student;
typedef struct SStudent
{
char id1[40];
char id2[40];
char id3[40];
float av;
}sstudent;
int main(){
int serv_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
struct sockaddr_in serv_addr;
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr("127.0.0.2");
serv_addr.sin_port = htons(1234);
bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
listen(serv_sock, 20);
printf("IP:127.0.0.2 Port:1234 \n");
struct sockaddr_in clnt_addr;
socklen_t clnt_addr_size = sizeof(clnt_addr);
int clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
student stu1,stu2,stu3;
sstudent ss;
char str[1024];
float f;
while(1)
{
recv(clnt_sock,(char*)&stu1,sizeof(student),0);
recv(clnt_sock,(char*)&stu2,sizeof(student),0);
recv(clnt_sock,(char*)&stu3,sizeof(student),0);
f=(stu1.gr+stu2.gr+stu3.gr)/3;
printf("average grade: %f\n",f);
int i;
for(i=0;i<sizeof(stu1.id);i++)
{
ss.id1[i]=stu1.id[i];
}
for(i=0;i<sizeof(stu2.id);i++)
{
ss.id2[i]=stu2.id[i];
}
for(i=0;i<sizeof(stu3.id);i++)
{
ss.id3[i]=stu3.id[i];
}
ss.av=f;
send(clnt_sock,(char*)&ss,sizeof(sstudent),0);
}
//char str[1024],str1[24];
/*char name1[40],name2[40],name3[40];
char ID1[40],ID2[40],ID3[40];
float f1,f2,f3;
while(1)
{
read(clnt_sock, name1, sizeof(name1));
read(clnt_sock, ID1, sizeof(ID1));
read(clnt_sock, name1, sizeof(name1));
printf("client send: %s\n",str);
if(str[0]=='e'&&str[1]=='n'&&str[2]=='d')
break;
}*/
/*while(1)
{
read(clnt_sock, str1, sizeof(str1));
recv(str,(char*)&stu,sizeof(stu),0);
printf("client send: %s\n",stu.name);
printf("%s\n",stu.id);
printf("%f\n",stu.gr);
}*/
close(clnt_sock);
close(serv_sock);
return 0;
}