封装http操作类

      近期在对http数据包的研究过程中感觉自己应该封装个http类，虽然ms有wininet，功能也很强大，但我们自己也试着写个吧，练练手。

#include <iostream>#include <string>#include "mysocket.h"#include <windows.h>using namespace std;class http{public:http();~http();void addheader(char*,char*);void setmethod(char *);void putdata(char*,int len);void send(char*);int getdata(char*,int);void getheader(char*,char *);int getstatus();void openurl(char *);void close();private:string header;char* data;int datalen;string method;mysocket s;};http::http(){header="";data="";method="GET";data=0;datalen=0;}http::~http(){s.close();delete[] data;}void http::addheader(char* key,char* v){header+=key;header+=":";header+=v;header+="/r/n";}void http::setmethod(char *m){method=strupr(m);}void http::putdata(char* d,int len){data=new char[len];datalen=len;for(int i=0;i<len;i++){data[i]=d[i];}}void http::send(char* url){char *o=strstr(url,"http://");string host;char *t=(o-url==0)?o+7:url;while(*t!='/'){host+=*(t++);}string name=t;string str=method;str+=" ";str+=name;str+=" HTTP/1.1";str+="/r/n";str+="HOST:";str+=host;str+="/r/n";str+=header;str+="/r/n";char temp[1024];memset(temp,0,1024);s.init();s.connect(s.gethostbyname((char*)host.data()),80);s.send((char*)str.data(),str.length());for(int i=0;i<datalen;){if(i+1024>datalen){memcpy(temp,data+i,datalen-i);s.send(temp,datalen-i);}else{memcpy(temp,data+i,1024);s.send(temp,1024);}i+=1024;memset(temp,0,1024);}char ch;str="";while(1){s.recv(&ch,1);str+=ch;if(str.length()>4 && str[str.length()-1]=='/n' && str[str.length()-2]=='/r' && str[str.length()-3]=='/n' && str[str.length()-4]=='/r'){header=str;break;}}}int http::getdata(char* buf,int len){/*if(l==0){char buf[1024];while(1){data=new char[1024];memset(buf,0,1024);int l=s.recv(buf,1024);if(l<=0){break;}cout<<buf<<endl;}}else{}*/return s.recv(buf,len);}void http::getheader(char* key,char *v){string temp="/r/n";temp+=key;temp+=": ";char *l=strstr(header.data(),temp.data());if(l==0){strcpy(v,"");}else{char *t=l+temp.length();string val;while(*t!='/r'){val+=*(t++);}strcpy(v,val.data());}}int http::getstatus(){char s[10]={0};char *str=strstr(header.data()," ")+1;int i=0;while(*str!=' '){s[i++]=*(str++);}return atoi(s);}void http::openurl(char *url){ addheader("Accept","*/*");addheader("User-Agent","sx");addheader("Connection","close");addheader("Cache-Control","no-cache");send(url);}void http::close(){s.close();delete[] data;header="";data="";method="GET";data=0;datalen=0;}

      下面给出个例子：

main(){
 WSADATA data;  
 WORD v=MAKEWORD(2,2);  
 WSAStartup(v,&data);
 http h;
h.openurl("http://www.baidu.com/");
 char buf[1025];
 string str;
  while(1){
   memset(buf,0,1025);
   int l=h.getdata(buf,1024);
   if(l<=0){
    break;
   }
   cout<<buf;
   //system("pause");
  }
 
}

      其实openurl是addheader和send的简化形式。代码应该不难理解，我本来想在getdata这个方法里完成对数据的一次性读取，后来发现不可行，便放弃了。

      本文有不足之处，还望大家多多指教。