在linux和windows上实现
c/s模式
socket循环服务器求解一元二次方程的根
ax^2+bx+c=0
根据上式，客户端发送a,b,c给服务器，返回求解的根
暂未考虑非法数据等问题
linux:
tcpclient.cpp
1 #include<iostream>
2 #include <unistd.h>
3 #include<sys/types.h>
4 #include<sys/socket.h>
5 #include<netdb.h>
6 #include<arpa/inet.h>
7 #include<cstring>
8 #include<sstream>
9
10 using namespace std;
11
12 #define BUFSIZE 512
13
14 // #define SERVERIP "192.168.41.32"
15 // #define SERVERPORT 4140
16
17 /*error report*/
18 static void bail(const char *on_what){
19 fputs(strerror(errno), stderr);
20 fputs(": ", stderr);
21 fputs(on_what, stderr);
22 fputc('\n', stderr);
23 exit(1);
24 }
25
26 void getarg(int argc,char* argv[],const char** SERVERIP,int* SERVERPORT)
27 {
28 for(int i=0;i<argc;i++)
29 {
30 istringstream iss(argv[i]);
31 string str;
32 iss>>str;
33 if(str=="ip")
34 {
35 *SERVERIP=argv[i+1];
36 }
37 else if(str=="port")
38 {
39 istringstream sts(argv[i+1]);
40 string s_port;
41 sts>>s_port;
42 *SERVERPORT=stoi(s_port);
43 }
44 else
45 {
46
47 }
48
49 }
50 }
51
52 int main(int argc,char* argv[])
53 {
54 const char* SERVERIP="192.168.41.32";
55 int SERVERPORT=4140;
56
57 getarg(argc,argv,&SERVERIP,&SERVERPORT);
58
59 int sockfd;
60 struct sockaddr_in server_addr;
61 const char* sendbuf = (char*)"hello,this is client";
62 char recvbuf[BUFSIZE];
63
64 //create socket
65 if ((sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) <0)//创建套接字描述符
66 {
67 fprintf(stderr,"Socket error %s\n",strerror(errno));
68 exit(-1);
69 }
70
71 memset(&server_addr, 0,sizeof(server_addr));
72 server_addr.sin_family = AF_INET;
73 server_addr.sin_port = htons(SERVERPORT);
74 server_addr.sin_addr.s_addr = inet_addr(SERVERIP);
75
76 if ((connect(sockfd, (struct sockaddr*) & server_addr, sizeof(struct sockaddr))) < 0)//连接远程对等实体
77 {
78 fprintf(stderr,"connect error %s\n",strerror(errno));
79 exit(-1);
80 }
81
82 if ((send(sockfd, sendbuf, strlen(sendbuf), 0)) != strlen(sendbuf))//发送数据
83 {
84 fprintf(stderr,"send error %s\n",strerror(errno));
85 exit(-1);
86 }
87
88 memset(recvbuf,'\0', sizeof(recvbuf));
89 while (true)
90 {
91 int num = recv(sockfd, recvbuf, sizeof(recvbuf), 0);//获取数据
92 if (num < 0)
93 {
94 fprintf(stderr,"recv error %s\n",strerror(errno));
95 exit(-1);
96 }
97 else
98 {
99 cout << recvbuf << endl;
100 break;
101 }
102 }
103
104 // double a=1.1,b=2.2,c=3.3;
105 double a,b,c;
106 cout<<"please input a,b,c (ax^2+bx+c=0) :"<<endl;
107 cin>>a>>b>>c;
108 string str=to_string(a)+' '+to_string(b)+' '+to_string(c);
109 sendbuf=str.data();
110 if ((send(sockfd, sendbuf, strlen(sendbuf), 0)) != strlen(sendbuf))//发送数据
111 {
112 fprintf(stderr,"send error %s\n",strerror(errno));
113 exit(-1);
114 }
115
116 while (true)
117 {
118 int num = recv(sockfd, recvbuf, sizeof(recvbuf), 0);//获取数据
119 if (num < 0)
120 {
121 fprintf(stderr,"recv error %s\n",strerror(errno));
122 exit(-1);
123 }
124 else
125 {
126 cout << recvbuf << endl;
127 break;
128 }
129 }
130
131 cout<<"exit..."<<endl;
132
133 close(sockfd);//终止通信并释放套接字描述符
134
135 return 0;
136 }
View Code
tcpserv.cpp
1 #include<iostream>
2 #include<string.h>
3 #include <unistd.h>
4 #include<sys/types.h>
5 #include<sys/socket.h>
6 #include<netdb.h>
7 #include<arpa/inet.h>
8 #include<cmath>
9 #include<cstring>
10 #include<sstream>
11
12 #define BUFSIZE 512
13 #define PORT 4140
14 #define MAXLISTEN 128
15
16 /*error report*/
17 static void bail(const char *on_what){
18 fputs(strerror(errno), stderr);
19 fputs(": ", stderr);
20 fputs(on_what, stderr);
21 fputc('\n', stderr);
22 exit(1);
23 }
24
25 int main()
26 {
27 std::string cal(double,double,double);
28 double a=0.0,b=0.0,c=0.0;
29
30
31 int sockfd;//server fd
32 // int port;
33 int newfd;//connect fd
34 struct sockaddr_in server_addr;
35 struct sockaddr_in client_addr;
36
37 char reqbuf[BUFSIZE];
38
39 /*create server socket*/
40 if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0)//创建套接字描述符
41 {
42 fprintf(stderr,"Socket error %s\n",strerror(errno));
43 exit(-1);
44 }
45
46 /*ready for server addr*/
47 memset(&server_addr,0,sizeof(server_addr));
48 server_addr.sin_family=AF_INET;
49 server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
50 server_addr.sin_port=htons(PORT);
51
52 /*bind socket addr*/
53 int tmp=bind(sockfd,(struct sockaddr*)&server_addr,sizeof(server_addr));//将ip和port绑定到套接字上
54 if(tmp<0)
55 {
56 fprintf(stderr,"Bind error %s\n",strerror(errno));
57 exit(-1);
58 }
59
60 /*listen*/
61 if((listen(sockfd,MAXLISTEN))<0)//将套接字设置为被动模式
62 {
63 fprintf(stderr,"Listen error %s\n",strerror(errno));
64 exit(-1);
65 }
66 std::cout<<"waiting for client ..."<<std::endl;
67
68 /*server main while*/
69 while(true)
70 {
71 socklen_t size;
72 size=sizeof(struct sockaddr_in);
73
74 memset(&client_addr,0,sizeof(client_addr));
75 memset(&reqbuf,'\0',sizeof(reqbuf));
76
77 /*accept client & create new fd*/
78 if((newfd=accept(sockfd,(struct sockaddr*)&client_addr,&size))<0)//接受传入连接
79 {
80 fprintf(stderr,"Accept error %s\n",strerror(errno));
81 exit(-1);
82 }
83 std::cout<<"Server got connect from "<<inet_ntoa(client_addr.sin_addr)<<std::endl;
84
85 /*recv data from client*/
86 if((recv(newfd,reqbuf,sizeof(reqbuf),0))<0)//获取数据
87 {
88 fprintf(stderr,"Recv error %s\n",strerror(errno));
89 exit(-1);
90 }
91 std::cout<<reqbuf<<std::endl;
92
93 /*send data to client*/
94 char * cip=inet_ntoa(client_addr.sin_addr);
95 char tmp[strlen(cip)];
96 strcpy(tmp,cip);
97 strcat(tmp," connected");
98 const char *sendbuf=tmp;
99 // std::cout<<sendbuf<<std::endl;
100 if((send(newfd,sendbuf,strlen(sendbuf),0))!=strlen(sendbuf))//发送数据
101 {
102 fprintf(stderr,"Send error %s\n",strerror(errno));
103 exit(-1);
104 }
105
106 /*do with data*/
107 memset(&reqbuf,'\0',sizeof(reqbuf));
108 if((recv(newfd,reqbuf,sizeof(reqbuf),0))<0)//获取数据
109 {
110 fprintf(stderr,"Recv error %s\n",strerror(errno));
111 exit(-1);
112 }
113 std::cout<<reqbuf<<std::endl;
114
115 std::istringstream sts(reqbuf);
116 std::string sx,sy,sz;
117 sts>>sx>>sy>>sz;
118 // std::cout<<sx<<std::endl<<sy<<std::endl<<sz<<std::endl;
119
120 double a=stod(sx);
121 double b=stod(sy);
122 double c=stod(sz);
123 // std::cout<<a<<' '<<b<<std::endl<<c<<std::endl;
124
125 std::string res=cal(a,b,c);
126 sendbuf=res.data();
127 // sendbuf="123345";
128
129 char ch[BUFSIZE];
130 strcpy(ch,sendbuf);
131 std::cout<<ch<<std::endl;
132
133 if((send(newfd,sendbuf,strlen(sendbuf),0))!=strlen(sendbuf))//发送数据
134 {
135 fprintf(stderr,"Send error %s\n",strerror(errno));
136 exit(-1);
137 }
138
139
140 /*close new fd*/
141 close(newfd);//终止通信并释放套接字描述符
142 }
143
144 /*close server fd*/
145 close(sockfd);//释放套接字描述符
146
147 std::cout<<"exit"<<std::endl;
148
149 return 0;
150 }
151
152 std::string cal(double a,double b,double c) {
153 std::string res="";
154
155 double x1, x2, discriminant, realPart, imaginaryPart;
156 // cout << "输入 a, b 和 c: ";
157 // cin >> a >> b >> c;
158 discriminant = b*b - 4*a*c;
159
160 if (discriminant > 0) {
161 x1 = (-b + sqrt(discriminant)) / (2*a);
162 x2 = (-b - sqrt(discriminant)) / (2*a);
163 // cout << "Roots are real and different." << endl;
164 // cout << "x1 = " << x1 << endl;
165 // cout << "x2 = " << x2 << endl;
166 std::string s1=std::to_string(x1);
167 std::string s2=std::to_string(x2);
168 res="Roots are real and different.\nx1="+s1+"\nx2="+s2+"\n";
169 }
170
171 else if (discriminant == 0) {
172 // cout << "实根相同：" << endl;
173 // x1 = (-b + sqrt(discriminant)) / (2*a);
174 // cout << "x1 = x2 =" << x1 << endl;
175 std::string s1=std::to_string(x1);
176 res="real roots are same：\nx1=x2="+s1+"\n";
177 }
178
179 else {
180 realPart = -b/(2*a);
181 imaginaryPart =sqrt(-discriminant)/(2*a);
182 // cout << "实根不同：" << endl;
183 // cout << "x1 = " << realPart << "+" << imaginaryPart << "i" << endl;
184 // cout << "x2 = " << realPart << "-" << imaginaryPart << "i" << endl;
185 std::string s1r=std::to_string(realPart);
186 std::string s1i=std::to_string(imaginaryPart);
187 std::string s2r=std::to_string(realPart);
188 std::string s2i=std::to_string(imaginaryPart);
189 res="real roots are defferent:\nx1="+s1r+"+"+s1i+"i\nx2="+s2r+"-"+s2i+"i\n";
190 }
191
192 return res;
193 }
View Code
udpclient.cpp
1 #include<iostream>
2 #include <unistd.h>
3 #include<sys/types.h>
4 #include<sys/socket.h>
5 #include<netdb.h>
6 #include<arpa/inet.h>
7 #include<cstring>
8 #include<sstream>
9
10 using namespace std;
11
12 #define BUFSIZE 512
13
14 // #define SERVERIP "192.168.2.169"
15 // #define SERVERPORT 4140
16
17 /*error report*/
18 static void bail(const char *on_what){
19 fputs(strerror(errno), stderr);
20 fputs(": ", stderr);
21 fputs(on_what, stderr);
22 fputc('\n', stderr);
23 exit(1);
24 }
25
26 void getarg(int argc,char* argv[],const char** SERVERIP,int* SERVERPORT)
27 {
28 for(int i=0;i<argc;i++)
29 {
30 istringstream iss(argv[i]);
31 string str;
32 iss>>str;
33 if(str=="ip")
34 {
35 *SERVERIP=argv[i+1];
36 }
37 else if(str=="port")
38 {
39 istringstream sts(argv[i+1]);
40 string s_port;
41 sts>>s_port;
42 *SERVERPORT=stoi(s_port);
43 }
44 else
45 {
46
47 }
48
49 }
50 }
51
52 int main(int argc,char* argv[])
53 {
54 const char* SERVERIP="192.168.41.32";
55 int SERVERPORT=4140;
56
57 getarg(argc,argv,&SERVERIP,&SERVERPORT);
58
59 int sockfd;
60 struct sockaddr_in server_addr;
61 struct sockaddr_in client_addr;
62 const char* sendbuf = (char*)"hello,this is client";
63 char recvbuf[BUFSIZE];
64
65 //create socket
66 if ((sockfd = socket(AF_INET, SOCK_DGRAM,0)) <0)//创建套接字描述符
67 {
68 fprintf(stderr,"Socket error %s\n",strerror(errno));
69 exit(-1);
70 }
71
72 memset(&server_addr, 0,sizeof(server_addr));
73 server_addr.sin_family = AF_INET;
74 server_addr.sin_port = htons(SERVERPORT);
75 server_addr.sin_addr.s_addr = inet_addr(SERVERIP);
76
77 // if ((connect(sockfd, (struct sockaddr*) & server_addr, sizeof(struct sockaddr))) < 0)
78 // {
79 // cout << "Connect Error::" << GetLastError() << endl;
80 // return -1;
81 // }
82
83 if ((sendto(sockfd, sendbuf, strlen(sendbuf), 0,(struct sockaddr*)&server_addr,sizeof(struct sockaddr_in))) != strlen(sendbuf))//发送数据
84 {
85 fprintf(stderr,"sendto error %s\n",strerror(errno));
86 exit(-1);
87 }
88
89 memset(&client_addr,0,sizeof(client_addr));
90 memset(recvbuf, 0,sizeof(recvbuf));
91 while (true)
92 {
93 socklen_t len=sizeof(struct sockaddr_in);
94 int num = recvfrom(sockfd, recvbuf, sizeof(recvbuf), 0,(struct sockaddr*)&client_addr,&len);//获取数据
95 if (num < 0)
96 {
97 fprintf(stderr,"recvfrom error %s\n",strerror(errno));
98 exit(-1);
99 }
100 else
101 {
102 cout << recvbuf << endl;
103 break;
104 }
105 }
106
107 double a,b,c;
108 cout<<"please input a,b,c (ax^2+bx+c=0) :"<<endl;
109 cin>>a>>b>>c;
110 string str=to_string(a)+' '+to_string(b)+' '+to_string(c);
111 sendbuf=str.data();
112 if ((sendto(sockfd, sendbuf, strlen(sendbuf), 0,(struct sockaddr*)&server_addr,sizeof(struct sockaddr_in))) != strlen(sendbuf))//发送数据
113 {
114 fprintf(stderr,"sendto error %s\n",strerror(errno));
115 exit(-1);
116 }
117
118 while (true)
119 {
120 socklen_t len=sizeof(struct sockaddr_in);
121 int num = recvfrom(sockfd, recvbuf, sizeof(recvbuf), 0,(struct sockaddr*)&client_addr,&len);//获取数据
122 if (num < 0)
123 {
124 fprintf(stderr,"recvfrom error %s\n",strerror(errno));
125 exit(-1);
126 }
127 else
128 {
129 cout << recvbuf << endl;
130 break;
131 }
132 }
133
134 cout<<"exit..."<<endl;
135
136 close(sockfd);//终止通信并释放套接字描述符
137
138 return 0;
139 }
View Code
udpserv.cpp
1 #include<iostream>
2 #include<string.h>
3 #include <unistd.h>
4 #include<sys/types.h>
5 #include<sys/socket.h>
6 #include<netdb.h>
7 #include<arpa/inet.h>
8 #include<cmath>
9 #include<cstring>
10 #include<sstream>
11
12 #define BUFSIZE 512
13 #define PORT 4140
14 #define MAXLISTEN 128
15
16 /*error report*/
17 static void bail(const char *on_what){
18 fputs(strerror(errno), stderr);
19 fputs(": ", stderr);
20 fputs(on_what, stderr);
21 fputc('\n', stderr);
22 exit(1);
23 }
24
25 int main()
26 {
27 std::string cal(double,double,double);
28 double a=0.0,b=0.0,c=0.0;
29
30
31 int sockfd;//server fd
32 // int port;
33 int newfd;//connect fd
34 struct sockaddr_in server_addr;
35 struct sockaddr_in client_addr;
36
37 char reqbuf[BUFSIZE];
38
39 // signal(SIGINT,my_handler);
40
41 /*create server socket*/
42 if((sockfd=socket(AF_INET,SOCK_DGRAM,0))<0)//创建套接字描述符
43 {
44 fprintf(stderr,"Socket error %s\n",strerror(errno));
45 exit(-1);
46 }
47
48 /*ready for server addr*/
49 memset(&server_addr,0,sizeof(server_addr));
50 server_addr.sin_family=AF_INET;
51 server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
52 server_addr.sin_port=htons(PORT);
53
54 /*bind socket addr*/
55 if((bind(sockfd,(struct sockaddr*)&server_addr,sizeof(server_addr)))<0)//将ip和port绑定到套接字上
56 {
57 fprintf(stderr,"Bind error %s\n",strerror(errno));
58 exit(-1);
59 }
60
61 /*server main while*/
62 while(true)
63 {
64 socklen_t size;
65 size=sizeof(struct sockaddr_in);
66 memset(&client_addr,0,sizeof(client_addr));
67 memset(&reqbuf,'\0',sizeof(reqbuf));
68
69 /*recv data from client*/
70 if((recvfrom(sockfd,reqbuf,sizeof(reqbuf),0,(struct sockaddr*)&client_addr,&size))<0)//获取数据
71 {
72 fprintf(stderr,"Recvfrom error %s\n",strerror(errno));
73 exit(-1);
74 }
75 std::cout<<reqbuf<<std::endl;
76
77 /*send data to client*/
78 char * cip=inet_ntoa(client_addr.sin_addr);
79 char tmp[strlen(cip)];
80 strcpy(tmp,cip);
81 strcat(tmp," connected");
82 const char *sendbuf=tmp;
83 if((sendto(sockfd,sendbuf,strlen(sendbuf),0,(struct sockaddr*)&client_addr,size))!=strlen(sendbuf))//发送数据
84 {
85 fprintf(stderr,"Sendto error %s\n",strerror(errno));
86 exit(-1);
87 }
88
89 /*do with data*/
90 memset(&reqbuf,'\0',sizeof(reqbuf));
91 if((recvfrom(sockfd,reqbuf,sizeof(reqbuf),0,(struct sockaddr*)&client_addr,&size))<0)//获取数据
92 {
93 fprintf(stderr,"Recv error %s\n",strerror(errno));
94 exit(-1);
95 }
96 std::cout<<reqbuf<<std::endl;
97
98 std::istringstream sts(reqbuf);
99 std::string sx,sy,sz;
100 sts>>sx>>sy>>sz;
101 // std::cout<<sx<<std::endl<<sy<<std::endl<<sz<<std::endl;
102
103 double a=stod(sx);
104 double b=stod(sy);
105 double c=stod(sz);
106 // std::cout<<a<<' '<<b<<std::endl<<c<<std::endl;
107
108 std::string res=cal(a,b,c);
109 sendbuf=res.data();
110 // sendbuf="123345";
111
112 char ch[BUFSIZE];
113 strcpy(ch,sendbuf);
114 std::cout<<ch<<std::endl;
115
116 if((sendto(sockfd,sendbuf,strlen(sendbuf),0,(struct sockaddr*)&client_addr,size))!=strlen(sendbuf))//发送数据
117 {
118 fprintf(stderr,"Send error %s\n",strerror(errno));
119 exit(-1);
120 }
121
122 }
123
124 /*close server fd*/
125 close(sockfd);//终止通信并释放套接字描述符
126
127 std::cout<<"exit"<<std::endl;
128
129 return 0;
130 }
131
132 std::string cal(double a,double b,double c) {
133 std::string res="";
134
135 double x1, x2, discriminant, realPart, imaginaryPart;
136 // cout << "输入 a, b 和 c: ";
137 // cin >> a >> b >> c;
138 discriminant = b*b - 4*a*c;
139
140 if (discriminant > 0) {
141 x1 = (-b + sqrt(discriminant)) / (2*a);
142 x2 = (-b - sqrt(discriminant)) / (2*a);
143 // cout << "Roots are real and different." << endl;
144 // cout << "x1 = " << x1 << endl;
145 // cout << "x2 = " << x2 << endl;
146 std::string s1=std::to_string(x1);
147 std::string s2=std::to_string(x2);
148 res="Roots are real and different.\nx1="+s1+"\nx2="+s2+"\n";
149 }
150
151 else if (discriminant == 0) {
152 // cout << "实根相同：" << endl;
153 // x1 = (-b + sqrt(discriminant)) / (2*a);
154 // cout << "x1 = x2 =" << x1 << endl;
155 std::string s1=std::to_string(x1);
156 res="real roots are same：\nx1=x2="+s1+"\n";
157 }
158
159 else {
160 realPart = -b/(2*a);
161 imaginaryPart =sqrt(-discriminant)/(2*a);
162 // cout << "实根不同：" << endl;
163 // cout << "x1 = " << realPart << "+" << imaginaryPart << "i" << endl;
164 // cout << "x2 = " << realPart << "-" << imaginaryPart << "i" << endl;
165 std::string s1r=std::to_string(realPart);
166 std::string s1i=std::to_string(imaginaryPart);
167 std::string s2r=std::to_string(realPart);
168 std::string s2i=std::to_string(imaginaryPart);
169 res="real roots are defferent:\nx1="+s1r+"+"+s1i+"i\nx2="+s2r+"-"+s2i+"i\n";
170 }
171
172 return res;
173 }
View Code
windows:
tcplient.cpp
1 #include<iostream>
2 #include<WinSock2.h>
3 #include<cstring>
4 #include<sstream>
5
6 #pragma comment(lib, "ws2_32")
7
8 using namespace std;
9
10 // #define SERVERIP "192.168.41.32"
11 // #define SERVERPORT 4140
12
13 void getarg(int argc,char* argv[],const char** SERVERIP,int* SERVERPORT)
14 {
15 for(int i=0;i<argc;i++)
16 {
17 istringstream iss(argv[i]);
18 string str;
19 iss>>str;
20 if(str=="ip")
21 {
22 *SERVERIP=argv[i+1];
23 }
24 else if(str=="port")
25 {
26 istringstream sts(argv[i+1]);
27 string s_port;
28 sts>>s_port;
29 *SERVERPORT=stoi(s_port);
30 }
31 else
32 {
33
34 }
35
36 }
37 }
38
39 int main(int argc,char* argv[])
40 {
41 const char* SERVERIP="192.168.41.32";
42 int SERVERPORT=4140;
43
44 getarg(argc,argv,&SERVERIP,&SERVERPORT);
45
46 SOCKET sockfd;
47 struct sockaddr_in server_addr;
48 WSADATA ws;
49 const char* sendbuf = (char*)"hello,this is client";
50 char recvbuf[MAX_PATH];
51
52 //init windows socket
53 if (WSAStartup(MAKEWORD(2, 2), &ws) != 0)
54 {
55 cout << "Init Windows Socket Failed::" << GetLastError() << endl;
56 return -1;
57 }
58
59 //create socket
60 if ((sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)//创建套接字
61 {
62 cout << "Create Socket Failed::" << GetLastError() << endl;
63 return -1;
64 }
65
66 ZeroMemory(&server_addr, sizeof(server_addr));
67 server_addr.sin_family = AF_INET;
68 server_addr.sin_port = htons(SERVERPORT);
69 server_addr.sin_addr.S_un.S_addr = inet_addr(SERVERIP);
70
71 if ((connect(sockfd, (struct sockaddr*) & server_addr, sizeof(struct sockaddr))) < 0)//连接远程对等实体
72 {
73 cout << "Connect Error::" << GetLastError() << endl;
74 return -1;
75 }
76
77 if ((send(sockfd, sendbuf, strlen(sendbuf), 0)) != strlen(sendbuf))//发送数据
78 {
79 cout << "Send Error::" << GetLastError() << endl;
80 return -1;
81 }
82
83 ZeroMemory(recvbuf, sizeof(recvbuf));
84 while (true)
85 {
86 int num = recv(sockfd, recvbuf, sizeof(recvbuf), 0);//获取数据
87 if (num < 0)
88 {
89 cout << "Recv Error::" << GetLastError() << endl;
90 return -1;
91 }
92 else
93 {
94 cout << recvbuf << endl;
95 break;
96 }
97 }
98
99 // double a=1.1,b=2.2,c=3.3;
100 double a,b,c;
101 cout<<"please input a,b,c (ax^2+bx+c=0) :"<<endl;
102 cin>>a>>b>>c;
103 string str=to_string(a)+' '+to_string(b)+' '+to_string(c);
104 sendbuf=str.data();
105 if ((send(sockfd, sendbuf, strlen(sendbuf), 0)) != strlen(sendbuf))//发送数据
106 {
107 cout << "Send Error::" << GetLastError() << endl;
108 return -1;
109 }
110
111 while (true)
112 {
113 int num = recv(sockfd, recvbuf, sizeof(recvbuf), 0);
114 if (num < 0)
115 {
116 cout << "Recv Error::" << GetLastError() << endl;
117 return -1;
118 }
119 else
120 {
121 cout << recvbuf << endl;
122 break;
123 }
124 }
125
126 cout<<"exit..."<<endl;
127
128 closesocket(sockfd);//终止通信并释放套接字
129 WSACleanup();
130
131 system("pause");
132
133 return 0;
134 }
View Code
tcpserv.cpp
1 #include<iostream>
2 #include<WinSock2.h>
3 // #include<string.h>
4 // #include<unistd.h>
5 // #include<sys/types.h>
6 #include<cmath>
7 #include<cstring>
8 #include<sstream>
9
10 #pragma comment(lib, "ws2_32")
11
12 using namespace std;
13
14 #define BUFSIZE 512
15 #define PORT 4140
16 #define MAXLISTEN 128
17
18 /*error report*/
19 static void bail(const char *on_what){
20 fputs(strerror(errno), stderr);
21 fputs(": ", stderr);
22 fputs(on_what, stderr);
23 fputc('\n', stderr);
24 exit(1);
25 }
26
27 int main()
28 {
29 string cal(double,double,double);
30 double a=0.0,b=0.0,c=0.0;
31
32
33 int sockfd;//server fd
34 // int port;
35 int newfd;//connect fd
36 WSADATA ws;
37 struct sockaddr_in server_addr;
38 struct sockaddr_in client_addr;
39
40 char reqbuf[BUFSIZE];
41
42 //init windows socket
43 if(WSAStartup(MAKEWORD(2,2),&ws)!=0)
44 {
45 cout << "Init Windows Socket Failed::" << GetLastError() << endl;
46 exit(-1);
47 }
48
49 /*create server socket*/
50 if((sockfd=socket(AF_INET,SOCK_STREAM,0))==INVALID_SOCKET)//创建套接字
51 {
52 fprintf(stderr,"Socket error %s\n",strerror(errno));
53 exit(-1);
54 }
55
56 /*ready for server addr*/
57 ZeroMemory(&server_addr,sizeof(server_addr));
58 server_addr.sin_family=AF_INET;
59 server_addr.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
60 server_addr.sin_port=htons(PORT);
61
62 /*bind socket addr*/
63 int tmp=bind(sockfd,(struct sockaddr*)&server_addr,sizeof(server_addr));//将ip和port绑定到套接字上
64 if(tmp<0)
65 {
66 fprintf(stderr,"Bind error %s\n",strerror(errno));
67 exit(-1);
68 }
69
70 /*listen*/
71 if((listen(sockfd,MAXLISTEN))<0)//设置为被动模式
72 {
73 fprintf(stderr,"Listen error %s\n",strerror(errno));
74 exit(-1);
75 }
76 cout<<"waiting for client ..."<<endl;
77
78 /*server main while*/
79 while(true)
80 {
81 int size;
82 size=sizeof(struct sockaddr_in);
83
84 ZeroMemory(&client_addr,sizeof(client_addr));
85 ZeroMemory(&reqbuf,sizeof(reqbuf));
86
87 /*accept client & create new fd*/
88 if((newfd=accept(sockfd,(struct sockaddr*)&client_addr,&size))<0)//接受传入请求
89 {
90 fprintf(stderr,"Accept error %s\n",strerror(errno));
91 exit(-1);
92 }
93 cout<<"Server got connect from "<<inet_ntoa(client_addr.sin_addr)<<endl;
94
95 /*recv data from client*/
96 if((recv(newfd,reqbuf,sizeof(reqbuf),0))<0)//获取数据
97 {
98 fprintf(stderr,"Recv error %s\n",strerror(errno));
99 exit(-1);
100 }
101 cout<<reqbuf<<endl;
102
103 /*send data to client*/
104 char * cip=inet_ntoa(client_addr.sin_addr);
105 char tmp[strlen(cip)];
106 strcpy(tmp,cip);
107 strcat(tmp," connected");
108 const char *sendbuf=tmp;
109 // cout<<sendbuf<<endl;
110 if((send(newfd,sendbuf,strlen(sendbuf),0))!=strlen(sendbuf))//发送数据
111 {
112 fprintf(stderr,"Send error %s\n",strerror(errno));
113 exit(-1);
114 }
115
116 /*do with data*/
117 memset(&reqbuf,'\0',sizeof(reqbuf));
118 if((recv(newfd,reqbuf,sizeof(reqbuf),0))<0)//获取数据
119 {
120 fprintf(stderr,"Recv error %s\n",strerror(errno));
121 exit(-1);
122 }
123 cout<<reqbuf<<endl;
124
125 istringstream sts(reqbuf);
126 string sx,sy,sz;
127 sts>>sx>>sy>>sz;
128 // cout<<sx<<endl<<sy<<endl<<sz<<endl;
129
130 double a=stod(sx);
131 double b=stod(sy);
132 double c=stod(sz);
133 // cout<<a<<' '<<b<<endl<<c<<endl;
134
135 string res=cal(a,b,c);
136 sendbuf=res.data();
137 // sendbuf="123345";
138
139 char ch[BUFSIZE];
140 strcpy(ch,sendbuf);
141 cout<<ch<<endl;
142
143 if((send(newfd,sendbuf,strlen(sendbuf),0))!=strlen(sendbuf))//发送数据
144 {
145 fprintf(stderr,"Send error %s\n",strerror(errno));
146 exit(-1);
147 }
148
149
150 /*close new fd*/
151 closesocket(newfd);//终止通信并释放套接字
152 }
153
154 /*close server fd*/
155 closesocket(sockfd);//释放套接字
156 WSACleanup();
157
158 cout<<"exit"<<endl;
159
160 return 0;
161 }
162
163 string cal(double a,double b,double c) {
164 string res="";
165
166 double x1, x2, discriminant, realPart, imaginaryPart;
167 // cout << "输入 a, b 和 c: ";
168 // cin >> a >> b >> c;
169 discriminant = b*b - 4*a*c;
170
171 if (discriminant > 0) {
172 x1 = (-b + sqrt(discriminant)) / (2*a);
173 x2 = (-b - sqrt(discriminant)) / (2*a);
174 // cout << "Roots are real and different." << endl;
175 // cout << "x1 = " << x1 << endl;
176 // cout << "x2 = " << x2 << endl;
177 string s1=to_string(x1);
178 string s2=to_string(x2);
179 res="Roots are real and different.\nx1="+s1+"\nx2="+s2+"\n";
180 }
181
182 else if (discriminant == 0) {
183 // cout << "实根相同：" << endl;
184 // x1 = (-b + sqrt(discriminant)) / (2*a);
185 // cout << "x1 = x2 =" << x1 << endl;
186 string s1=to_string(x1);
187 res="real roots are same：\nx1=x2="+s1+"\n";
188 }
189
190 else {
191 realPart = -b/(2*a);
192 imaginaryPart =sqrt(-discriminant)/(2*a);
193 // cout << "实根不同：" << endl;
194 // cout << "x1 = " << realPart << "+" << imaginaryPart << "i" << endl;
195 // cout << "x2 = " << realPart << "-" << imaginaryPart << "i" << endl;
196 string s1r=to_string(realPart);
197 string s1i=to_string(imaginaryPart);
198 string s2r=to_string(realPart);
199 string s2i=to_string(imaginaryPart);
200 res="real roots are defferent:\nx1="+s1r+"+"+s1i+"i\nx2="+s2r+"-"+s2i+"i\n";
201 }
202
203 return res;
204 }
View Code
udpclient.cpp
1 #include<iostream>
2 #include<WinSock2.h>
3 #include<cstring>
4 #include<sstream>
5
6 #pragma comment(lib, "ws2_32")
7
8 using namespace std;
9
10 // #define SERVERIP "192.168.2.169"
11 // #define SERVERPORT 4140
12
13 void getarg(int argc,char* argv[],const char** SERVERIP,int* SERVERPORT)
14 {
15 for(int i=0;i<argc;i++)
16 {
17 istringstream iss(argv[i]);
18 string str;
19 iss>>str;
20 if(str=="ip")
21 {
22 *SERVERIP=argv[i+1];
23 }
24 else if(str=="port")
25 {
26 istringstream sts(argv[i+1]);
27 string s_port;
28 sts>>s_port;
29 *SERVERPORT=stoi(s_port);
30 }
31 else
32 {
33
34 }
35
36 }
37 }
38
39 int main(int argc,char* argv[])
40 {
41 const char* SERVERIP="192.168.41.32";
42 int SERVERPORT=4140;
43
44 getarg(argc,argv,&SERVERIP,&SERVERPORT);
45
46 SOCKET sockfd;
47 struct sockaddr_in server_addr;
48 struct sockaddr_in client_addr;
49 WSADATA ws;
50 const char* sendbuf = (char*)"hello,this is client";
51 char recvbuf[MAX_PATH];
52
53 //init windows socket
54 if (WSAStartup(MAKEWORD(2, 2), &ws) != 0)
55 {
56 cout << "Init Windows Socket Failed::" << GetLastError() << endl;
57 return -1;
58 }
59
60 //create socket
61 if ((sockfd = socket(AF_INET, SOCK_DGRAM,0)) == INVALID_SOCKET)//创建套接字描述符
62 {
63 cout << "Create Socket Failed::" << GetLastError() << endl;
64 return -1;
65 }
66
67 ZeroMemory(&server_addr, sizeof(server_addr));
68 server_addr.sin_family = AF_INET;
69 server_addr.sin_port = htons(SERVERPORT);
70 server_addr.sin_addr.S_un.S_addr = inet_addr(SERVERIP);
71
72 // if ((connect(sockfd, (struct sockaddr*) & server_addr, sizeof(struct sockaddr))) < 0)
73 // {
74 // cout << "Connect Error::" << GetLastError() << endl;
75 // return -1;
76 // }
77
78 if ((sendto(sockfd, sendbuf, strlen(sendbuf), 0,(struct sockaddr*)&server_addr,sizeof(struct sockaddr_in))) != strlen(sendbuf))//发送数据
79 {
80 cout << "Sendto Error::" << GetLastError() << endl;
81 return -1;
82 }
83
84 ZeroMemory(&client_addr,sizeof(client_addr));
85 ZeroMemory(recvbuf, sizeof(recvbuf));
86 while (true)
87 {
88 int len=sizeof(struct sockaddr_in);
89 int num = recvfrom(sockfd, recvbuf, sizeof(recvbuf), 0,(struct sockaddr*)&client_addr,&len);//获取数据
90 if (num < 0)
91 {
92 cout << "Recvfrom Error::" << GetLastError() << endl;
93 return -1;
94 }
95 else
96 {
97 cout << recvbuf << endl;
98 break;
99 }
100 }
101
102 double a,b,c;
103 cout<<"please input a,b,c (ax^2+bx+c=0) :"<<endl;
104 cin>>a>>b>>c;
105 string str=to_string(a)+' '+to_string(b)+' '+to_string(c);
106 sendbuf=str.data();
107 if ((sendto(sockfd, sendbuf, strlen(sendbuf), 0,(struct sockaddr*)&server_addr,sizeof(struct sockaddr_in))) != strlen(sendbuf))//发送数据
108 {
109 cout << "Sendto Error::" << GetLastError() << endl;
110 return -1;
111 }
112
113 while (true)
114 {
115 int len=sizeof(struct sockaddr_in);
116 int num = recvfrom(sockfd, recvbuf, sizeof(recvbuf), 0,(struct sockaddr*)&client_addr,&len);//获取数据
117 if (num < 0)
118 {
119 cout << "Recv Error::" << GetLastError() << endl;
120 return -1;
121 }
122 else
123 {
124 cout << recvbuf << endl;
125 break;
126 }
127 }
128
129 cout<<"exit..."<<endl;
130
131 closesocket(sockfd);//终止通信并释放套接字
132 WSACleanup();
133
134 system("pause");
135
136 return 0;
137 }
View Code
udpserv.cpp
1 #include<iostream>
2 #include<winsock2.h>
3 // #include<string.h>
4 // #include<unistd.h>
5 // #include<sys/types.h>
6 #include<cmath>
7 #include<cstring>
8 #include<sstream>
9
10 #pragma comment(lib, "ws2_32")
11
12 using namespace std;
13
14 #define BUFSIZE 512
15 #define PORT 4140
16 #define MAXLISTEN 128
17
18 /*error report*/
19 static void bail(const char *on_what){
20 fputs(strerror(errno), stderr);
21 fputs(": ", stderr);
22 fputs(on_what, stderr);
23 fputc('\n', stderr);
24 exit(1);
25 }
26
27 int main()
28 {
29 string cal(double,double,double);
30 double a=0.0,b=0.0,c=0.0;
31
32
33 int sockfd;//server fd
34 // int port;
35 int newfd;//connect fd
36 WSADATA ws;
37 struct sockaddr_in server_addr;
38 struct sockaddr_in client_addr;
39
40 char reqbuf[BUFSIZE];
41
42 // signal(SIGINT,my_handler);
43
44 //init windows socket
45 if(WSAStartup(MAKEWORD(2,2),&ws)!=0)
46 {
47 cout << "Init Windows Socket Failed::" << GetLastError() << endl;
48 exit(-1);
49 }
50
51 /*create server socket*/
52 if((sockfd=socket(AF_INET,SOCK_DGRAM,0))<0)//创建套接字描述符
53 {
54 fprintf(stderr,"Socket error %s\n",strerror(errno));
55 exit(-1);
56 }
57
58 /*ready for server addr*/
59 ZeroMemory(&server_addr,sizeof(server_addr));
60 server_addr.sin_family=AF_INET;
61 server_addr.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
62 server_addr.sin_port=htons(PORT);
63
64 /*bind socket addr*/
65 if((bind(sockfd,(struct sockaddr*)&server_addr,sizeof(server_addr)))<0)//将ip和port绑定到套接字上
66 {
67 fprintf(stderr,"Bind error %s\n",strerror(errno));
68 exit(-1);
69 }
70
71 /*server main while*/
72 while(true)
73 {
74 int size;
75 size=sizeof(struct sockaddr_in);
76 ZeroMemory(&client_addr,sizeof(client_addr));
77 ZeroMemory(&reqbuf,sizeof(reqbuf));
78
79 /*recv data from client*/
80 if((recvfrom(sockfd,reqbuf,sizeof(reqbuf),0,(struct sockaddr*)&client_addr,&size))<0)//获取数据
81 {
82 fprintf(stderr,"Recvfrom error %s\n",strerror(errno));
83 exit(-1);
84 }
85 cout<<reqbuf<<endl;
86
87 /*send data to client*/
88 char * cip=inet_ntoa(client_addr.sin_addr);
89 char tmp[strlen(cip)];
90 strcpy(tmp,cip);
91 strcat(tmp," connected");
92 const char *sendbuf=tmp;
93 if((sendto(sockfd,sendbuf,strlen(sendbuf),0,(struct sockaddr*)&client_addr,size))!=strlen(sendbuf))//发送数据
94 {
95 fprintf(stderr,"Sendto error %s\n",strerror(errno));
96 exit(-1);
97 }
98
99 /*do with data*/
100 ZeroMemory(&reqbuf,sizeof(reqbuf));
101 if((recvfrom(sockfd,reqbuf,sizeof(reqbuf),0,(struct sockaddr*)&client_addr,&size))<0)//获取数据
102 {
103 fprintf(stderr,"Recv error %s\n",strerror(errno));
104 exit(-1);
105 }
106 cout<<reqbuf<<endl;
107
108 istringstream sts(reqbuf);
109 string sx,sy,sz;
110 sts>>sx>>sy>>sz;
111 // cout<<sx<<endl<<sy<<endl<<sz<<endl;
112
113 double a=stod(sx);
114 double b=stod(sy);
115 double c=stod(sz);
116 // cout<<a<<' '<<b<<endl<<c<<endl;
117
118 string res=cal(a,b,c);
119 sendbuf=res.data();
120 // sendbuf="123345";
121
122 char ch[BUFSIZE];
123 strcpy(ch,sendbuf);
124 cout<<ch<<endl;
125
126 if((sendto(sockfd,sendbuf,strlen(sendbuf),0,(struct sockaddr*)&client_addr,size))!=strlen(sendbuf))//发送数据
127 {
128 fprintf(stderr,"Send error %s\n",strerror(errno));
129 exit(-1);
130 }
131
132 }
133
134 /*close server fd*/
135 closesocket(sockfd);//终止通信并释放套接字
136 WSACleanup();
137
138 cout<<"exit"<<endl;
139
140 return 0;
141 }
142
143 string cal(double a,double b,double c) {
144 string res="";
145
146 double x1, x2, discriminant, realPart, imaginaryPart;
147 // cout << "输入 a, b 和 c: ";
148 // cin >> a >> b >> c;
149 discriminant = b*b - 4*a*c;
150
151 if (discriminant > 0) {
152 x1 = (-b + sqrt(discriminant)) / (2*a);
153 x2 = (-b - sqrt(discriminant)) / (2*a);
154 // cout << "Roots are real and different." << endl;
155 // cout << "x1 = " << x1 << endl;
156 // cout << "x2 = " << x2 << endl;
157 string s1=to_string(x1);
158 string s2=to_string(x2);
159 res="Roots are real and different.\nx1="+s1+"\nx2="+s2+"\n";
160 }
161
162 else if (discriminant == 0) {
163 // cout << "实根相同：" << endl;
164 // x1 = (-b + sqrt(discriminant)) / (2*a);
165 // cout << "x1 = x2 =" << x1 << endl;
166 string s1=to_string(x1);
167 res="real roots are same：\nx1=x2="+s1+"\n";
168 }
169
170 else {
171 realPart = -b/(2*a);
172 imaginaryPart =sqrt(-discriminant)/(2*a);
173 // cout << "实根不同：" << endl;
174 // cout << "x1 = " << realPart << "+" << imaginaryPart << "i" << endl;
175 // cout << "x2 = " << realPart << "-" << imaginaryPart << "i" << endl;
176 string s1r=to_string(realPart);
177 string s1i=to_string(imaginaryPart);
178 string s2r=to_string(realPart);
179 string s2i=to_string(imaginaryPart);
180 res="real roots are defferent:\nx1="+s1r+"+"+s1i+"i\nx2="+s2r+"-"+s2i+"i\n";
181 }
182
183 return res;
184 }
View Code
参考：
其他：
循环的结束和跳出本来想用信号实现，但水平有限，发现是个坑，之后再填。