socket实现网页下载.docx
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socket实现网页下载.docx
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socket实现网页下载
72.HTTPÏÂÔØ
//HttpDownload.h
#ifndef_HTTPDOWNLOAD_H
#define_HTTPDOWNLOAD_H
//#include"InitSock.h"
//staticCInitSockinitsock;
/************************************************************************
Description:
Base64±àÂë¡¢½âÂëÀà
Function:
¿ÉÓÃÓÚ½â¾öhttpÐÒéµÄÊÚȨÑéÖ¤ÎÊÌâ
************************************************************************/
classCBase64
{
private:
CBase64();
~CBase64();
CBase64(constCBase64&);
CBase64&operator=(constCBase64&);
public:
staticintBase64Encode(LPCTSTRlpszEncoding,CString&strEncoded);
staticintBase64Decode(LPCTSTRlpszDecoding,CString&strDecoded);
public:
staticints_nBase64Mask[];
staticCStrings_strBase64TAB;
};
/************************************************************************
Description:
ÓÃhttpÐÒéÏÂÔØÎļþ
Function:
Ö§³ÖhttpÏÂÔØÎļþ,ÓÃsocketʵÏÖ,¼òµ¥µÄ·Ç×èÈû³¬Ê±»úÖÆ
************************************************************************/
classCHttpDownload
{
public:
CHttpDownload();
~CHttpDownload();
public:
enum
{
DEFAULT_PORT=80,
DEFAULT_CONNECTTIMEOUT=10,
DEFAULT_SENDTIMEOUT=10,
DEFAULT_RECVTIMEOUT=10,
};
boolDownload(LPCTSTRlpszDownloadUrl,LPCTSTRlpszSavePath);
protected:
boolCreateSocket();
voidCloseSocket();
voidFormatRequestHeader(constchar*pszServer,intnPort,constchar*pszObject,constchar*pAuthorization=NULL);
boolSendRequest();
private:
boolConnect(constchar*pszHostIP,intnPort=DEFAULT_PORT,longltimeout=DEFAULT_CONNECTTIMEOUT);
intSelectRecv(char*pData,intlen,longtimeout=DEFAULT_RECVTIMEOUT);
intSelectSend(char*pData,intlen,longtimeout=DEFAULT_SENDTIMEOUT);
boolGetResponseHeader();
intGetServerInfo(DWORD&dwContentLength,DWORD&dwStatusCode)const;
private:
SOCKETm_hSocket;
charm_szRequestHeader[1024];//±£´æÇëÇóÍ·
charm_szResponseHeader[1024];//±£´æÏìӦͷ
intm_nResponseHeaderSize;//ÏìӦͷ´óС
};
staticboolParseURL(LPCTSTRlpszURL,CString&strServer,CString&strObject,int&nPort)
{
CStringstrURL(lpszURL);
strURL.TrimLeft();
strURL.TrimRight();
//Çå³ýÊý¾Ý
strServer=_T("");
strObject=_T("");
nPort=0;
intnPos=strURL.Find(":
//");
if(nPos==-1)
returnfalse;
//½øÒ»²½ÑéÖ¤ÊÇ·ñΪhttp:
//
CStringstrTemp=strURL.Left(nPos+lstrlen(":
//"));
strTemp.MakeLower();
if(strTemp.Compare("http:
//
")!
=0)
returnfalse;
strURL=strURL.Mid(strTemp.GetLength());
nPos=strURL.Find('/');
if(nPos==-1)
returnfalse;
strObject=strURL.Mid(nPos);
strTemp=strURL.Left(nPos);
///////////////////////////////////////////////////////////////
///×¢Ò⣺²¢Ã»Óп¼ÂÇURLÖÐÓÐÓû§ÃûºÍ¿ÚÁîµÄÇéÐκÍ×îºóÓÐ#µÄÇéÐÎ
///ÀýÈ磺http:
//abc@def:
:
81/index.html#link1
///
//////////////////////////////////////////////////////////////
//²éÕÒÊÇ·ñÓж˿ںÅ
nPos=strTemp.Find(":
");
if(nPos==-1)
{
strServer=strTemp;
nPort=CHttpDownload:
:
DEFAULT_PORT;
}
else
{
strServer=strTemp.Left(nPos);
strTemp=strTemp.Mid(nPos+1);
nPort=_ttoi((LPCTSTR)strTemp);
}
returntrue;
}
#endif
//HttpDownload.cpp
#include"StdAfx.h"
#include"HttpDownload.h"
/************************************************************************
************************************************************************/
intCBase64:
:
s_nBase64Mask[]={0,1,3,7,15,31,63,127,255};
CStringCBase64:
:
s_strBase64TAB=_T("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
intCBase64:
:
Base64Decode(LPCTSTRlpszDecoding,CString&strDecoded)
{
intnIndex=0;
intnDigit;
intnDecode[256];
intnSize;
intnNumBits=6;
if(lpszDecoding==NULL)
return0;
if((nSize=lstrlen(lpszDecoding))==0)
return0;
//BuildDecodeTable
for(inti=0;i<256;i++)
nDecode[i]=-2;//Illegaldigit
for(i=0;i<64;i++)
{
nDecode[s_strBase64TAB[i]]=i;
nDecode['=']=-1;
}
//Cleartheoutputbuffer
strDecoded=_T("");
longlBitsStorage=0;
intnBitsRemaining=0;
intnScratch=0;
UCHARc;
//DecodetheInput
for(nIndex=0,i=0;nIndex { c=lpszDecoding[nIndex]; //ºöÂÔËùÓв»ºÏ·¨µÄ×Ö·û if(c>0x7F) continue; nDigit=nDecode[c]; if(nDigit>=0) { lBitsStorage=(lBitsStorage< nBitsRemaining+=nNumBits; while(nBitsRemaining>7) { nScratch=lBitsStorage>>(nBitsRemaining-8); strDecoded+=(nScratch&0xFF); i++; nBitsRemaining-=8; } } } returnstrDecoded.GetLength(); } intCBase64: : Base64Encode(LPCTSTRlpszEncoding,CString&strEncoded) { intnDigit; intnNumBits=6; intnIndex=0; intnInputSize; strEncoded=_T(""); if(lpszEncoding==NULL) return0; if((nInputSize=lstrlen(lpszEncoding))==0) return0; intnBitsRemaining=0; longlBitsStorage=0; longlScratch=0; intnBits; UCHARc; while(nNumBits>0) { while((nBitsRemaining { c=lpszEncoding[nIndex++]; lBitsStorage<<=8; lBitsStorage|=(c&0xff); nBitsRemaining+=8; } if(nBitsRemaining { lScratch=lBitsStorage<<(nNumBits-nBitsRemaining); nBits=nBitsRemaining; nBitsRemaining=0; } else { lScratch=lBitsStorage>>(nBitsRemaining-nNumBits); nBits=nNumBits; nBitsRemaining-=nNumBits; } nDigit=(int)(lScratch&s_nBase64Mask[nNumBits]); nNumBits=nBits; if(nNumBits<=0) break; strEncoded+=s_strBase64TAB[nDigit]; } //Padwith'='asperRFC1521 while(strEncoded.GetLength()%4! =0) strEncoded+='='; returnstrEncoded.GetLength(); } /************************************************************************ ************************************************************************/ CHttpDownload: : CHttpDownload(): m_hSocket(INVALID_SOCKET), m_nResponseHeaderSize(0) { memset(m_szRequestHeader,0,sizeof(m_szRequestHeader)); memset(m_szResponseHeader,0,sizeof(m_szResponseHeader)); } CHttpDownload: : ~CHttpDownload() { CloseSocket(); } boolCHttpDownload: : CreateSocket() { CloseSocket(); m_hSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP); if(INVALID_SOCKET==m_hSocket) { returnfalse; } returntrue; } voidCHttpDownload: : CloseSocket() { if(INVALID_SOCKET! =m_hSocket) { closesocket(m_hSocket); m_hSocket=INVALID_SOCKET; } } voidCHttpDownload: : FormatRequestHeader(constchar*pszServer,intnPort,constchar*pszObject,constchar*pAuthorization/*=NULL*/) { memset(m_szRequestHeader,'/0',1024); //µÚ1ÐУºÇëÇóµÄ·½·¨£¬Â·¾¶£¬°æ±¾ strcat(m_szRequestHeader,"GET"); strcat(m_szRequestHeader,pszObject); strcat(m_szRequestHeader,"HTTP/1.0"); strcat(m_szRequestHeader,"/r/n"); //µÚ2ÐУºÇëÇóµÄÊý¾ÝÀàÐÍ strcat(m_szRequestHeader,"Accept: */*"); strcat(m_szRequestHeader,"/r/n"); //µÚ3ÐУºÖ÷»ú£¬¶Ë¿Ú charszPort[10]; sprintf(szPort,": %d",nPort); strcat(m_szRequestHeader,"Host: "); strcat(m_szRequestHeader,pszServer); strcat(m_szRequestHeader,szPort); strcat(m_szRequestHeader,"/r/n"); //µÚ4ÐУº»º³å¿ØÖÆ strcat(m_szRequestHeader,"Catch-control: no-cache"); strcat(m_szRequestHeader,"/r/n"); //µÚ5ÐУº·ÃÎÊȨÏÞ if(pAuthorization) { CStringstrAuth; strcat(m_szRequestHeader,"Authorization: Basic"); CBase64: : Base64Encode(pAuthorization,strAuth); strcat(m_szRequestHeader,strAuth); strcat(m_szRequestHeader,"/r/n"); } //×îºóÒ»ÐУº¿ÕÐÐ strcat(m_szRequestHeader,"/r/n"); } boolCHttpDownload: : SendRequest() { intlen=strlen(m_szRequestHeader); //if(send(m_hSocket,m_szRequestHeader,len,0)==SOCKET_ERROR) //{ //returnfalse; //} if(SelectSend(m_szRequestHeader,len,DEFAULT_SENDTIMEOUT)<=0) { returnfalse; } if(! GetResponseHeader()) { returnfalse; } returntrue; } boolCHttpDownload: : Connect(constchar*pszHostIP,intnPort/*DEFAULT_PORT*/,longltimeout/*DEFAULT_CONNECTTIMEOUT*/) { ASSERT(pszHostIP); sockaddr_inaddr; memset(&addr,0,sizeof(addr)); addr.sin_family=AF_INET; addr.sin_port=htons(nPort); addr.sin_addr.S_un.S_addr=inet_addr(pszHostIP); unsignedlongul=1; intret=ioctlsocket(m_hSocket,FIONBIO,(unsignedlong*)&ul); if(ret==SOCKET_ERROR) { returnfalse; } connect(m_hSocket,(sockaddr*)&addr,sizeof(addr)); timevaltimeout={1,ltimeout}; fd_setr; FD_ZERO(&r); FD_SET(m_hSocket,&r); ret=select(0,0,&r,0,&timeout); if(ret<=0) { returnfalse; } //Ò»°ã·ÇËø¶¨Ä£Ê½Ì׽ӱȽÏÄÑ¿ØÖÆ£¬¿ÉÒÔ¸ù¾Ýʵ¼ÊÇé¿ö¿¼ÂÇÔÙÉè»Ø×èÈûģʽ unsignedlongul1=0; ret=ioctlsocket(m_hSocket,FIONBIO,(unsignedlong*)&ul1); if(ret==SOCKET_ERROR) { returnfalse; } returntrue; } boolCHttpDownload: : GetResponseHeader() { charc=0; boolbEndResponse=false; intnIndex=0; intret; while(! bEndResponse&&nIndex<1024) { ret=SelectRecv(&m_szResponseHeader[nIndex++],1); if(ret<=0) returnfalse; if(nIndex>=4) { if(m_szResponseHeader[nIndex-4]=='/r'&&m_szResponseHeader[nIndex-3]=='/n' &&m_szResponseHeader[nIndex-2]=='/r'&&m_szResponseHeader[nIndex-1]=='/n') bEndResponse=true; } } m_nResponseHeaderSize=nIndex; returntrue; } intCHttpDownload: : GetServerInfo(DWORD&dwContentLength,DWORD&dwStatusCode)const { if(0==m_nResponseHeaderSize) { dwContentLength=-1; dwStatusCode=-1; return-1; } charszState[3]; szState[0]=m_szResponseHeader[9]; szState[1]=m_szResponseHeader[10]; szState[2]=m_szResponseHeader[11]; dwStatusCode=(DWORD)_ttol(szState); //»ñÈ¡ContentLength CStringstrResponseHeader=m_szResponseHeader; intnPos=strResponseHeader.Find("Content-length: "); if(nPos==-1)
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