linux下C++SocketTCP编程---客户端

NetClient.h

 #ifndef NETCLIENT_H_
 #define NETCLIENT_H_
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
 #include <sys/socket.h>
 #include <resolv.h>
 #include <stdlib.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <iostream>
 using namespace std;
 class NetClient {
 public:
     NetClient();
     virtual ~NetClient();
     void RevHello(char* str,int para[]);
     void SendHi();
     void CreateConnect();
     void CheckConnect();
     void MyTest();
 protected:
     void ConnectServer();
     bool CheckBuff(char* str,int num);
     void HandlePacket();
     void DividePacket(char* str);
     void HandlePacketHead(char** str,int param[]);
     void SendPacket(string strInfo);
 private:
 #define MAXBUF 1024
     int sockfd;
     struct sockaddr_in serverAddr;
     bool connectFlag;
 };
 #endif /* NETCLIENT_H_ */

NetClient.cpp

 #include "NetClient.h"

 #define defPort 7788   //ssh服务的端口号：22
 char defIP[]="127.0.0.1";
 NetClient::NetClient()
 {
 }
 NetClient::~NetClient()
 {
     close(sockfd);
 }
 void NetClient::CreateConnect()
 {
     if((sockfd=socket(AF_INET,SOCK_STREAM,0))==0)
     {
         printf("create socket errno：%d, errerInfo：%s\n",errno,strerror(errno));
         exit(1);
     }
     else
         printf("socket created sucessfully\n");

     bzero(&serverAddr,sizeof(serverAddr));
     serverAddr.sin_family=AF_INET;
     serverAddr.sin_port=htons(defPort);
     serverAddr.sin_addr.s_addr=inet_addr(defIP);

     connectFlag=false;
     int b_on = 1;
     ioctl (sockfd, FIONBIO, &b_on);

     //设置socket属性为非阻塞方式
 //  if(fcntl(sockfd,F_SETFL,O_NONBLOCK)==-1)
 //      printf("fcntl errno：%d, errerInfo：%s\n",errno,strerror(errno));
 }
 void NetClient::CheckConnect()
 {
     if(connectFlag)
         HandlePacket();
     else
         ConnectServer();
 }
 void NetClient::ConnectServer()
 {
     if(connect(sockfd,(struct sockaddr*)&serverAddr,sizeof(serverAddr))!=0)
     {
         connectFlag=false;
         printf("connect erron：%d, errerInfo：%s\n",errno,strerror(errno));
     }
     else
     {
         connectFlag=true;
         printf("client connect to server successfully\n\n\n");
         int b_on = 1;
         ioctl (sockfd, FIONBIO, &b_on);
     }
 }
 void NetClient::HandlePacket()
 {
     char buffer[MAXBUF];
     bzero(buffer,MAXBUF);
     int ret=recv(sockfd,buffer,sizeof(buffer),0);
     if(ret!=-1)
     {
         if(CheckBuff(buffer,ret))
             DividePacket(buffer);
         else
             cout<<"\""<<buffer<<"\""<<" has illegal data!!!"<<endl;
     }
     else
         cout<<"recv erron="<<errno<<"  errorInfo:"<<strerror(errno)<<endl;
 }
 bool NetClient::CheckBuff(char* str,int num)
 {
     //合法字符只有空格(32)，_ (95)小写字母(97~122)和数字(48~57)
     for(int i=32;i<num;i++)
     {
         if(str[i]==32||str[i]==95)
             continue;
         else if(str[i]>=97&&str[i]<=122)
             continue;
         else if(str[i]>=48&&str[i]<=57)
             continue;
         else
             return false;
     }
     return true;
 }
 void NetClient::DividePacket(char* str)
 {
     char* strHead[10];
     int paraList[10][10];
     for(int i=0;i<10;i++)
     {
         strHead[i]=NULL;
         for(int j=0;j<10;j++)
             paraList[i][j]='|';
     }
     char* subStr=strtok(str," ");
     int i=0,j=0;
     while(subStr!=NULL)
     {
         if(*subStr>=48 && *subStr<=57)
         {
             paraList[i-1][j]=atoi(subStr);
             j++;
         }
         else
         {
             strHead[i]=subStr;
             i++;
             j=0;
         }
         subStr=strtok(NULL," ");
     }
     for(int i=0;i<10;i++)
     {
         if(strHead[i])
             HandlePacketHead(strHead+i,paraList[i]);
     }
 }
 void NetClient::HandlePacketHead(char** str,int param[])
 {
     if(strcmp(*str,"hello")==0)
     {
         RevHello(*str,param);
     }
     else if(strcmp(*str,"women")==0)
     {
         cout<<"hellotoo"<<param[0]<<endl;
         SendPacket("thankyou 9809");
     }
     else
     {
         cout<<"no matched Info: "<<*str<<"    para: "<<*param<<endl;
     }
 }
 void NetClient::SendPacket(string strInfo)
 {
     char buffer[MAXBUF];
     bzero(buffer,MAXBUF);
     strcpy(buffer,strInfo.data());
     int len=send(sockfd,buffer,strlen(buffer),0);
     if(len==-1)
         printf("send errno=%d,errerInfo: %s\n",errno,strerror(errno));
     else
         printf("send successful: '%s' ,InfoLen=%d\n",buffer,len);
 }
 void NetClient::RevHello(char* str,int para[])
 {
     cout<<"rev "<<str<<" ";
     for(int i=0;i<10;i++)
     {
         if(para[i]!='|')
             cout<<para[i]<<" ";
         else
             cout<<" -!-"<<para[i];
     }
     cout<<endl;
     cout<<"I rev info"<<endl;
 }
 void NetClient::SendHi()
 {
     SendPacket("hello 1989 7812 hex 85");
 }

 void NetClient::MyTest()
 {
     //初始化服务器端的ip和端口信息
     bzero(&serverAddr,sizeof(serverAddr));
     serverAddr.sin_family=AF_INET;
     serverAddr.sin_port=htons(defPort);

     //本地IP地址 转换成 网络ip
     //serverAddr.sin_addr.s_addr=inet_addr(defIP);
     serverAddr.sin_addr.s_addr=htonl(INADDR_ANY);
     cout<<"internet IP: "<<serverAddr.sin_addr.s_addr<<endl;
     cout<<"internet port: "<<serverAddr.sin_port<<"  ntohs"<<ntohs(serverAddr.sin_port)<<endl;
     if(inet_aton(defIP,(struct in_addr*)&serverAddr.sin_addr.s_addr)==0)
         printf("inet_aton errno：%d, errerInfo：%s\n",errno,strerror(errno));

     cout<<"123internet IP: "<<serverAddr.sin_addr.s_addr<<endl;
     cout<<"IP: "<<inet_ntoa(serverAddr.sin_addr)<<endl;
 }
 int main()
 {
     NetClient NC;
     //NC.MyTest();
     NC.CreateConnect();
     while(1)
     {
         sleep(2);
         NC.CheckConnect();
         sleep(2);
         NC.SendHi();
     }
     return 0;
 }