C++ 用socket封装成http

// HttpSocket.h: interface for the CHttpSocket class.
//
//

#if !defined(AFX_HTTPSOCKET_H__F49A8F82_A933_41A8_AF47_68FBCAC4ADA6__INCLUDED_)
#define AFX_HTTPSOCKET_H__F49A8F82_A933_41A8_AF47_68FBCAC4ADA6__INCLUDED_

#include <afxinet.h>

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class CHttpSocket 
{
public:
    CHttpSocket();
    virtual ~CHttpSocket();
    int    GetServerState();//返回服务器状态码 -1表示不成功
    int    GetField(const char* szSession,char *szValue,int nMaxLength);//返回某个域值,-1表示不成功
    int    GetResponseLine(char *pLine,int nMaxLength);//获取返回头的一行
    const char*    GetResponseHeader(int &Length);//获取完整的返回头
    const char *FormatRequestHeader(char *pServer,char *pObject,long &Length,
                        char* pCookie=NULL,char *pReferer=NULL,
                        long nFrom=0,long nTo=0,
                        int nServerType=0);//格式化请求头
    int    GetRequestHeader(char *pHeader,int nMaxLength) const;
    BOOL SendRequest(const char* pRequestHeader = NULL,long Length = 0);   
    BOOL SetTimeout(int nTime,int nType=0);
    long Receive(char* pBuffer,long nMaxLength);
    BOOL Connect(char* szHostName,int nPort=80);
    BOOL Socket();
    BOOL CloseSocket();
protected:   
    char m_requestheader[1024];        //请求头
    char m_ResponseHeader[1024];    //回应头
    int m_port;                        //端口
    char m_ipaddr[256];                //IP地址
    BOOL m_bConnected;
    SOCKET m_s;
    hostent *m_phostent;

    int m_nCurIndex;                //GetResponsLine()函数的游标记录
    BOOL m_bResponsed;                //是否已经取得了返回头
    int m_nResponseHeaderSize;        //回应头的大小
};

#endif // !defined(AFX_HTTPSOCKET_H__F49A8F82_A933_41A8_AF47_68FBCAC4ADA6__INCLUDED_)

// HttpSocket.cpp: implementation of the CHttpSocket class.
//
//

#include "stdafx.h"
#include "HttpSocket.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

#define MAXHEADERSIZE 1024
//
// Construction/Destruction
//
CHttpSocket::CHttpSocket()
{
    m_s=NULL;
    m_phostent=NULL;
    m_port=80;
    m_bConnected=FALSE;
    for(int i=0;i<256;i++)
        m_ipaddr[i]='/0';
    memset(m_requestheader,0,MAXHEADERSIZE);
    memset(m_ResponseHeader,0,MAXHEADERSIZE);
    m_nCurIndex = 0;        //
    m_bResponsed = FALSE;
    m_nResponseHeaderSize = -1;
}

CHttpSocket::~CHttpSocket()
{
    CloseSocket();
}

BOOL CHttpSocket::Socket()
{
    if(m_bConnected)return FALSE;

    struct protoent *ppe;
    ppe=getprotobyname("tcp");
   
    ///创建SOCKET对象
    m_s=socket(PF_INET,SOCK_STREAM,ppe->p_proto);
    if(m_s==INVALID_SOCKET)
    {
        TRACE("socket()函数执行失败!/n");
        return FALSE;
    }

    return TRUE;

}

BOOL CHttpSocket::Connect(char *szHostName,int nPort)
{
    if(szHostName==NULL)
        return FALSE;

    ///若已经连接,则先关闭
    if(m_bConnected)
    {
        CloseSocket();
    }

    ///保存端口号
    m_port=nPort;

    ///根据主机名获得IP地址
    m_phostent=gethostbyname(szHostName);
    if(m_phostent==NULL)
    {
        TRACE("gethostbyname()函数执行失败!/n");
        return FALSE;
    }   
    ///连接
    struct in_addr ip_addr;
    memcpy(&ip_addr,m_phostent->h_addr_list[0],4);///h_addr_list[0]里4个字节,每个字节8位

    struct sockaddr_in destaddr;
    memset((void *)&destaddr,0,sizeof(destaddr));
    destaddr.sin_family=AF_INET;
    destaddr.sin_port=htons(80);
    destaddr.sin_addr=ip_addr;

    ///保存主机的IP地址字符串
    sprintf(m_ipaddr,"%d.%d.%d.%d",
        destaddr.sin_addr.S_un.S_un_b.s_b1,
        destaddr.sin_addr.S_un.S_un_b.s_b2,
        destaddr.sin_addr.S_un.S_un_b.s_b3,
        destaddr.sin_addr.S_un.S_un_b.s_b4);

    if(connect(m_s,(struct sockaddr*)&destaddr,sizeof(destaddr))!=0)
    {
    //    TRACE(NULL,"connect()函数执行失败!","错误",MB_OK);
        return FALSE;
    }
    ///设置已经连接的标志
    m_bConnected=TRUE;
    return TRUE;
}

///根据请求的相对URL输出HTTP请求头
const char *CHttpSocket::FormatRequestHeader(char *pServer,char *pObject, long &Length,
                                      char *pCookie,char *pReferer,long nFrom,
                                      long nTo,int nServerType)
{
    char szPort[10];
    char szTemp[20];
    sprintf(szPort,"%d",m_port);
    memset(m_requestheader,'/0',1024);

    ///第1行:方法,请求的路径,版本
    strcat(m_requestheader,"GET ");
    strcat(m_requestheader,pObject);
    strcat(m_requestheader," HTTP/1.1");
    strcat(m_requestheader,"/r/n");

    ///第2行:主机
    strcat(m_requestheader,"Host:");
    strcat(m_requestheader,pServer);
    strcat(m_requestheader,"/r/n");

    ///第3行:
    if(pReferer != NULL)
    {
        strcat(m_requestheader,"Referer:");
        strcat(m_requestheader,pReferer);
        strcat(m_requestheader,"/r/n");       
    }

    ///第4行:接收的数据类型
    strcat(m_requestheader,"Accept:*/*");
    strcat(m_requestheader,"/r/n");

    ///第5行:浏览器类型
    strcat(m_requestheader,"User-Agent:Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)");
    strcat(m_requestheader,"/r/n");

    ///第6行:连接设置,保持
    strcat(m_requestheader,"Connection:Keep-Alive");
    strcat(m_requestheader,"/r/n");

    ///第7行:Cookie.
    if(pCookie != NULL)
    {
        strcat(m_requestheader,"Set Cookie:0");
        strcat(m_requestheader,pCookie);
        strcat(m_requestheader,"/r/n");
    }

    ///第8行:请求的数据起始字节位置(断点续传的关键)
    if(nFrom > 0)
    {
        strcat(m_requestheader,"Range: bytes=");
        _ltoa(nFrom,szTemp,10);
        strcat(m_requestheader,szTemp);
        strcat(m_requestheader,"-");
        if(nTo > nFrom)
        {
            _ltoa(nTo,szTemp,10);
            strcat(m_requestheader,szTemp);
        }
        strcat(m_requestheader,"/r/n");
    }
   
    ///最后一行:空行
    strcat(m_requestheader,"/r/n");

    ///返回结果
    Length=strlen(m_requestheader);
    return m_requestheader;
}

///发送请求头
BOOL CHttpSocket::SendRequest(const char *pRequestHeader, long Length)
{
    if(!m_bConnected)return FALSE;

    if(pRequestHeader==NULL)
        pRequestHeader=m_requestheader;
    if(Length==0)
        Length=strlen(m_requestheader);

    if(send(m_s,pRequestHeader,Length,0)==SOCKET_ERROR)
    {
        TRACE("send()函数执行失败!/n");
        return FALSE;
    }
    int nLength;
    GetResponseHeader(nLength);
    return TRUE;
}

long CHttpSocket::Receive(char* pBuffer,long nMaxLength)
{
    if(!m_bConnected)return NULL;

    ///接收数据
    long nLength;
    nLength=recv(m_s,pBuffer,nMaxLength,0);
   
    if(nLength <= 0)
    {
        //MessageBox(NULL,"recv()函数执行失败!","错误",MB_OK);
        CloseSocket();
    }
    return nLength;
}

///关闭套接字
BOOL CHttpSocket::CloseSocket()
{
    if(m_s != NULL)
    {
        if(closesocket(m_s)==SOCKET_ERROR)
        {
            TRACE("closesocket()函数执行失败!/n");
            return FALSE;
        }
    }
    m_s = NULL;
    m_bConnected=FALSE;
    return TRUE;
}

int CHttpSocket::GetRequestHeader(char *pHeader, int nMaxLength) const
{
    int nLength;
    if(int(strlen(m_requestheader))>nMaxLength)
    {
        nLength=nMaxLength;
    }
    else
    {
        nLength=strlen(m_requestheader);
    }
    memcpy(pHeader,m_requestheader,nLength);
    return nLength;
}

//设置接收或者发送的最长时间
BOOL CHttpSocket::SetTimeout(int nTime, int nType)
{
    if(nType == 0)
    {
        nType = SO_RCVTIMEO;
    }
    else
    {
        nType = SO_SNDTIMEO;
    }

    DWORD dwErr;
    dwErr=setsockopt(m_s,SOL_SOCKET,nType,(char*)&nTime,sizeof(nTime));
    if(dwErr)
    {
        TRACE("setsockopt()函数执行失败!/n");
        return FALSE;
    }
    return TRUE;
}

//获取HTTP请求的返回头
const char* CHttpSocket::GetResponseHeader(int &nLength)
{
    if(!m_bResponsed)
    {
        char c = 0;
        int nIndex = 0;
        BOOL bEndResponse = FALSE;
        while(!bEndResponse && nIndex < MAXHEADERSIZE)
        {
            recv(m_s,&c,1,0);
            m_ResponseHeader[nIndex++] = c;
            if(nIndex >= 4)
            {
                if(m_ResponseHeader[nIndex - 4] == '/r' && m_ResponseHeader[nIndex - 3] == '/n'
                    && m_ResponseHeader[nIndex - 2] == '/r' && m_ResponseHeader[nIndex - 1] == '/n')
                bEndResponse = TRUE;
            }
        }
        m_nResponseHeaderSize = nIndex;
        m_bResponsed = TRUE;
    }
   
    nLength = m_nResponseHeaderSize;
    return m_ResponseHeader;
}

//返回HTTP响应头中的一行.
int CHttpSocket::GetResponseLine(char *pLine, int nMaxLength)
{
    if(m_nCurIndex >= m_nResponseHeaderSize)
    {
        m_nCurIndex = 0;
        return -1;
    }

    int nIndex = 0;
    char c = 0;
    do
    {
        c = m_ResponseHeader[m_nCurIndex++];
        pLine[nIndex++] = c;
    } while(c != '/n' && m_nCurIndex < m_nResponseHeaderSize && nIndex < nMaxLength);
   
    return nIndex;
}

int CHttpSocket::GetField(const char *szSession, char *szValue, int nMaxLength)
{
    //取得某个域值
    if(!m_bResponsed) return -1;
   
    CString strRespons;
    strRespons = m_ResponseHeader;
    int nPos = -1;
    nPos = strRespons.Find(szSession,0);
    if(nPos != -1)
    {
        nPos += strlen(szSession);
        nPos += 2;
        int nCr = strRespons.Find("/r/n",nPos);
        CString strValue = strRespons.Mid(nPos,nCr - nPos);
        strcpy(szValue,strValue);
        return (nCr - nPos);
    }
    else
    {
        return -1;
    }
}

int CHttpSocket::GetServerState()
{
    //若没有取得响应头,返回失败
    if(!m_bResponsed) return -1;
   
    char szState[3];
    szState[0] = m_ResponseHeader[9];
    szState[1] = m_ResponseHeader[10];
    szState[2] = m_ResponseHeader[11];

    return atoi(szState);
}

//下载子线程
DWORD WINAPI DownLoadIIS(LPVOID lParam)
{
    DOWNLOADIIS_INFO *pIIS = (DOWNLOADIIS_INFO *)lParam;

    if(pIIS->pAttrib->bDownload || pIIS->pAttrib->sDownloadAddr =="")
    {
        delete pIIS;
        return -1;
    }
   
    char szPath[256] = "/0";
    GetCurrentDirectory(256,szPath);
    strcat(szPath,"//Archive//");
    char strFilePath[256] = "/0";
    wsprintf(strFilePath,"%s%d.rar",szPath,pIIS->nIndex);

    CHttpSocket HttpSocket;
    CString strServer,strObject;
    unsigned short nPort;
    DWORD dwServiceType;
    long nLength;
    const char *pRequestHeader = NULL;
    AfxParseURL(pIIS->pAttrib->sDownloadAddr,dwServiceType,strServer,strObject,nPort);
   
    pRequestHeader = HttpSocket.FormatRequestHeader((LPTSTR)(LPCTSTR)strServer,(LPTSTR)(LPCTSTR)strObject,nLength);   
   
   
    if(!HttpSocket.Socket())
    {
        TRACE("创建服务器连接出错!/n");
        delete pIIS;
        return -1;
    }
   
    HttpSocket.SetTimeout(16000,0);
   
    if(!HttpSocket.Connect((LPTSTR)(LPCTSTR)strServer,nPort))
    {
        TRACE("连接服务器出错/n");
        delete pIIS;
        return -1;
    }
   
    if(!HttpSocket.SendRequest())
    {
        TRACE("发送请求出错/n");
        delete pIIS;
        return -1;
    }
   
   
    int nLineSize = 0;
    char szValue[30];
    HttpSocket.GetField("Content-Length",szValue,30);
    int nSvrState = HttpSocket.GetServerState();
   
    //服务器状态
    if(nSvrState == 404)
    {
        delete pIIS;
        return -1;
    }
   
    int nFileSize = atoi(szValue);//URL文件的长度
    int nCompletedSize = 0;
    CFile File;
    File.Open(strFilePath,CFile::modeCreate | CFile::modeWrite);
    char pData[1024];
    int nReceSize = 0;
    DWORD dwStartTime,dwEndTime;
    while(nCompletedSize < nFileSize)
    {
        dwStartTime = GetTickCount();
        nReceSize = HttpSocket.Receive(pData,1024);
        if(nReceSize == 0)
        {
            TRACE("服务器已经关闭连接/n");
            delete pIIS;
            return -1;
        }
        if(nReceSize == -1)
        {
            TRACE("接收数据超时./n");
            delete pIIS;
            return -1;
        }
        dwEndTime = GetTickCount();
        File.Write(pData,nReceSize);
        nCompletedSize += nReceSize;
    }
    File.Close();