VC++ 实现FTP下载的通用类
// DownloadFtp.cpp: implementation of the CDownloadFtp class.//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "downtest.h"
#include "DownloadFtp.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
void DownloadNotify ( int nIndex, UINT nNotityType, LPVOID lpNotifyData, LPVOID pDownloadMTR );
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CDownloadFtp::CDownloadFtp()
{
}
CDownloadFtp::~CDownloadFtp()
{
}
//
// 创建一个 FTP 的数据通道连接
//
BOOL CDownloadFtp::CreateFTPDataConnect(CSocketClient &SocketClient)
{
ASSERT ( SocketClient.m_hSocket == INVALID_SOCKET );
// 设被动模式
if ( !m_SocketClient.SendString ( "PASV\r\n" ) ) return FALSE;
CString csResponseStr;
if ( !m_SocketClient.GetResponse ( 227, &csResponseStr ) )
return FALSE;
CString csPasvIP;
USHORT uPasvPort = 0;
if ( !m_SocketClient.GetIPAndPortByPasvString ( csResponseStr, csPasvIP, uPasvPort ) )
return FALSE;
// 创建数据通道连接
if ( !SocketClient.Connect ( csPasvIP, uPasvPort ) )
return FALSE;
return TRUE;
}
//
// 连接需要下载的服务器
//
BOOL CDownloadFtp::Connect ()
{
if ( !CDownloadPub::Connect () )
return FALSE;
SLEEP_RETURN_Down ( 0 );
int nResponseCode = m_SocketClient.GetResponse ();
if ( nResponseCode != 220 )
{
Log ( L_WARNING, "(%d) Connect to [%s:%u] failed", m_nIndex, m_csServer, m_nPort );
}
// 登录
SLEEP_RETURN_Down ( 0 );
if ( m_csUsername.IsEmpty () )
m_csUsername = "anonymous";
if ( !m_SocketClient.SendString ( "USER %s\r\n", m_csUsername ) ) return FALSE;
nResponseCode = m_SocketClient.GetResponse ();
// 需要密码
SLEEP_RETURN_Down ( 0 );
if ( nResponseCode == 331 )
{
if ( !m_SocketClient.SendString ( "PASS %s\r\n", m_csPassword ) ) return FALSE;
nResponseCode = m_SocketClient.GetResponse ();
}
// 登录失败
if ( nResponseCode != 230 )
{
Log ( L_ERROR, "(%d) Login failed", m_nIndex );
return FALSE;
}
Log ( L_NORMAL, "(%d) Welcome message：--------------------------\r\n%s\r\n", m_nIndex,
m_SocketClient.GetResponseHistoryString () );
m_SocketClient.ClearResponseHistoryString ();
return TRUE;
}
BOOL CDownloadFtp::DownloadOnce()
{
// 不需要下载了
int nWillDownloadSize = Get_WillDownloadSize(); // 本次应该下载的字节数
int nDownloadedSize = Get_DownloadedSize (); // 已下载字节数
if ( nWillDownloadSize > 0 && nDownloadedSize >= nWillDownloadSize )
return DownloadEnd(TRUE);
if ( !CDownloadPub::DownloadOnce () )
return DownloadEnd(FALSE);
// 设置接收数据类型为 二进制模式
if ( !m_SocketClient.SendString ( "TYPE I\r\n" ) )
return DownloadEnd(FALSE);
if ( !m_SocketClient.GetResponse ( 200 ) )
return DownloadEnd(FALSE);
SLEEP_RETURN_Down ( 0 );
// 创建数据通道连接
CSocketClient SocketClient;
SocketClient.SetEventOfEndModule ( m_hEvtEndModule );
SocketClient.m_nIndex = m_nIndex;
if ( !CreateFTPDataConnect ( SocketClient ) )
return DownloadEnd(FALSE);
SLEEP_RETURN_Down ( 0 );
// 设定下载文件的起始位置
int nWillDownloadStartPos = Get_WillDownloadStartPos (); // 开始位置
if ( !m_SocketClient.SendString ( "REST %d\r\n", nWillDownloadStartPos+nDownloadedSize ) )
return DownloadEnd(FALSE);
if ( !m_SocketClient.GetResponse ( 350 ) )
return DownloadEnd(FALSE);
// 提交下载文件的请求
if ( !m_SocketClient.SendString ( "RETR %s\r\n", m_csObject ) )
return DownloadEnd(FALSE);
if ( !m_SocketClient.GetResponse ( 150 ) )
return DownloadEnd(FALSE);
SLEEP_RETURN_Down ( 0 );
// 从数据通道读取数据，并保存到文件中
BOOL bRet = RecvDataAndSaveToFile(SocketClient);
SocketClient.Disconnect ();
return DownloadEnd ( bRet );
}
//
// 获取远程站点信息，如：是否支持断点续传、要下载的文件大小和创建时间等
//
BOOL CDownloadFtp::GetRemoteSiteInfo_Pro()
{
BOOL bRet = FALSE;
CSocketClient SocketClient;
CString csReadData;
char szRecvBuf = {0};
int nReadSize = 0;
CString csOneLine;
int i;
SocketClient.m_nIndex = m_nIndex;
if ( !HANDLE_IS_VALID(m_hEvtEndModule) )
goto Finished;
SocketClient.SetEventOfEndModule ( m_hEvtEndModule );
if ( !CDownloadPub::GetRemoteSiteInfo_Pro() )
goto Finished;
if ( !m_SocketClient.Is_Connected () && !Connect () )
goto Finished;
SLEEP_RETURN ( 0 );
// 设置接收数据类型为 ASCII
if ( !m_SocketClient.SendString ( "TYPE A\r\n" ) ) goto Finished;
if ( !m_SocketClient.GetResponse ( 200 ) )
goto Finished;
SLEEP_RETURN ( 0 );
// 判断是否支持断点续传
if ( !m_SocketClient.SendString ( "REST 1\r\n" ) ) goto Finished;
m_bSupportResume = ( m_SocketClient.GetResponse () == 350 );
TRACE ( "是否支持断点续传：%s\n", m_bSupportResume ? "支持":"不支持" );
if ( m_bSupportResume )
{
if ( !m_SocketClient.SendString ( "REST 0\r\n" ) ) goto Finished;
VERIFY ( m_SocketClient.GetResponse ( 350 ) );
}
SLEEP_RETURN ( 0 );
// 创建数据通道连接
if ( !CreateFTPDataConnect ( SocketClient ) )
goto Finished;
// 发送列举文件命令
if ( !m_SocketClient.SendString ( "LIST %s\r\n", m_csObject ) )
goto Finished;
if ( !m_SocketClient.GetResponse ( 150 ) )
goto Finished;
SLEEP_RETURN ( 0 );
// 从数据通道读取文件列表信息，直到命令通道返回 "226" 回应码，注意：这里接收数据用非阻塞型的。
for ( i=0; ;i++ )
{
memset ( szRecvBuf, 0, sizeof(szRecvBuf) );
nReadSize = SocketClient.Receive ( szRecvBuf, sizeof(szRecvBuf), FALSE );
if ( nReadSize < 0 )
{
Log ( L_WARNING, "(%d) Receive file list info failed", m_nIndex );
break;
}
csReadData += szRecvBuf;
int nResponseCode = m_SocketClient.GetResponse ( (CString*)NULL, FALSE );
if ( nResponseCode == -1 ) goto Finished;
else if ( nResponseCode == 0 )
{
SLEEP_RETURN ( 100 );
}
else if ( nResponseCode == 226 )
{
break;
}
else goto Finished;
SLEEP_RETURN ( 0 );
}
for ( i=0; !csReadData.IsEmpty() ; i++ )
{
csOneLine = GetOneLine ( csReadData );
if ( !csOneLine.IsEmpty() )
{
ParseFileInfoStr ( csOneLine );
}
}
bRet = TRUE;
Finished:
return bRet;
}
//
// 从 "-rw-rw-rw- 1 user group 37979686 Mar9 13:39 FTP-Callgle 1.4.0_20060309.cab" 字符串中分析
// 出文件信息
//
void CDownloadFtp::ParseFileInfoStr(CString &csFileInfoStr)
{
csFileInfoStr.TrimLeft (); csFileInfoStr.TrimRight ();
if ( csFileInfoStr.IsEmpty() ) return;
BOOL bLastCharIsSpace = ( csFileInfoStr==' ' );
int nSpaceCount = 0;
CString csFileTime1, csFileTime2, csFileTime3;
CString csNodeStr;
CString csFileName;
for ( int i=0; i 0 && nWillDownloadSize-nDownloadedSize > m_nFileTotalSize )
Set_WillDownloadSize ( m_nFileTotalSize-nDownloadedSize );
}
}
// 文件时间第一节
else if ( nSpaceCount == 5 )
{
csFileTime1 = csNodeStr;
}
// 文件时间第二节
else if ( nSpaceCount == 6 )
{
csFileTime2 = csNodeStr;
}
// 文件时间第三节
else if ( nSpaceCount == 7 )
{
csFileTime3 = csNodeStr;
}
else if ( nSpaceCount > 7 )
{
csFileName = csFileInfoStr.Mid ( i );
csFileName.TrimLeft(); csFileName.TrimRight();
break;
}
}
bLastCharIsSpace = TRUE;
}
else
{
bLastCharIsSpace = FALSE;
}
}
GetFileTimeInfo ( csFileTime1, csFileTime2, csFileTime3 );
}
void CDownloadFtp::GetFileTimeInfo(CString csFileTime1, CString csFileTime2, CString csFileTime3)
{
if ( csFileTime3.IsEmpty() ) return;
CString csYear, csMonth, csDay, csHour, csMinute, csSecond;
int nMonth = GetMouthByShortStr ( csFileTime1 );
ASSERT ( nMonth >= 1 && nMonth
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