标签：star report 输入 opened spl strlen tmp pes bind
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
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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。
基于linux或windows的c/s的循环服务器求一元二次方程的根
标签：star report 输入 opened spl strlen tmp pes bind
原文地址：https://www.cnblogs.com/unknowcry/p/11861945.html
