求好点的FTP断点续传的类或是代码

cky77 2019-04-29 04:26:52

RT，下面是我找到的两段代码，都不能用。断点续传是不是必须要用FTP的原始命令呢？

CInternetSession session;

CFtpConnection *pFtp=session.GetFtpConnection(FTP服务器地址,用户名,密码);

CInternetFile *pFtpFile=pFtp->OpenFile(文件路径);CFile file;

int DownLength=0;//已经下载了的数据长度

if(目的目录下没有指定文件)//从头开始下载

{

   file.Open(目的文件路径，CFile::modeCreate|CFile::modeWrite);

}

else//断点续传

{

   file.Open(目的文件路径，CFile::modeWrite);

   file.SeekToEnd();

   DownLength=file.GetLength();

   pFtpFile->Seek(DownLength,CFile::begin);

}

int SrcLength=pFtpFile->GetLength();

while(DownLength<SrcLength)

{

   读源文件；

   写目的文件；

}

if(!localFile.Open(m_strLocalFolder + vedioFileName ,CFile::modeWrite|CFile::modeNoTruncate|CFile::modeCreate|CFile::shareDenyNone))

			return false;



				//设置文件大小



				CFileStatus fileStatus;

				localFile.GetStatus(fileStatus);

				m_nFileTransSize=fileStatus.m_size;

				localFile.SeekToEnd();

				CString pszOffset;

				pszOffset.Format("%d",m_nFileTransSize);

				HINTERNET hResponse;

				CString	strSeekOffsetCMD = "RETR ";

			

				DWORD dwError;

				TCHAR databuf1[200];

			        TCHAR databuf2[200];

				TCHAR databuf3[200];

				TCHAR databuf4[200];

				TCHAR databuf5[200];

				DWORD size=200;	









				pFtpCon->Command("TYPE I",CFtpConnection::CmdRespNone);

				InternetGetLastResponseInfo(&dwError,databuf1,&size);

//这里的m_strFtpFilE是指 ftp://file1/file2.exe 中的"file1//file2.exe" 

				pFtpCon->Command("SIZE /"+m_strFtpFile,CFtpConnection::CmdRespNone);

				InternetGetLastResponseInfo(&dwError,databuf1,&size);



				pFtpCon->Command("PASV",CFtpConnection::CmdRespNone);

				InternetGetLastResponseInfo(&dwError,databuf1,&size);

			int dataPort=ParsePasv(databuf1);



			pFtpCon->Command("PASV",CFtpConnection::CmdRespNone);

			InternetGetLastResponseInfo(&dwError,databuf1,&size);

			 dataPort=ParsePasv(databuf1);

		

			SOCKET recSocket;

			sockaddr_in saServer;

			hostent* remoteHost;

			char* remoteIP;



			// Create a listening socket

			recSocket = socket(AF_INET, SOCK_STREAM, 0);



			// Get the local host information

			remoteHost = gethostbyname(m_ftpIp);

			remoteIP = inet_ntoa (*(struct in_addr *)*remoteHost->h_addr_list);



			// Set up the sockaddr structure

			saServer.sin_family = AF_INET;

			saServer.sin_addr.s_addr = inet_addr(remoteIP);

			saServer.sin_port = htons(dataPort);



			// Bind the listening socket using the

			// information in the sockaddr structure

			InternetGetLastResponseInfo(&dwError,databuf4,&size);

			int ret = connect( recSocket, (SOCKADDR*)&saServer, sizeof(SOCKADDR) );

			InternetGetLastResponseInfo(&dwError,databuf5,&size);

			if( ret == SOCKET_ERROR )  

			{

				InternetGetLastResponseInfo(&dwError,databuf1,&size);

				DWORD ERRORRRR;

				ERRORRRR =GetLastError();

				return FALSE;

			}





			pFtpCon->Command("REST "+pszOffset,CFtpConnection::CmdRespNone);

			InternetGetLastResponseInfo(&dwError,databuf2,&size);

//这里的m_strFtpFilE是指 ftp://file1/file2.exe 中的"file1//file2.exe" 



strSeekOffsetCMD="RETR /"+m_strFtpFile;



			pFtpCon->Command(strSeekOffsetCMD,CFtpConnection::CmdRespNone);



			InternetGetLastResponseInfo(&dwError,databuf3,&size);



			//下载文件



			int len;



			do



			{



				len = recv(recSocket,buffer,nBufSize,0);



				if(len<0)



					break;



				localFile.Write(buffer,len);



				m_nFileTransSize += len;



				if(m_bForceStop)



					break;



			}while( len > 0 );



			localFile.Close();