奇尔卡特 FTP2 下载 (GetFile) 大文件 (≈12 GB)

Question

我一直在尝试使用 Chilkat.Ftp2 下载大约 12GB 的大文件。

一切似乎都很好，但是.. 下载往往会在 ~100% 时失败，在日志中我可以看到：

  GetFile:
    DllDate: Jul 30 2019
    ChilkatVersion: 9.5.0.79
    UnlockPrefix: NONE
    Architecture: Little Endian; 32-bit
    Language: .NET 4.7 / x86
    VerboseLogging: 0
    originalGreeting: 220 Titan FTP Server  Ready.
    remotePath: /fo/bar/export_20190819.zip
    localPath: \test\export_20190819.zip
    ProgressMonitoring:
      enabled: yes
      heartbeatMs: 0
      sendBufferSize: 65536
    --ProgressMonitoring
    downloadToFile:
      localFilePath: \test\export_20190819.zip
      Replacing existing local file
      downloadToOutput2:
        modeZ: 0
        binaryMode: 1
        setupDataConnection:
          passive transfer mode
          setupPassiveDataSocket:
            sendCommand:
              sendingCommand: PASV
            --sendCommand
            readCommandResponse:
              WindowsError: An existing connection was forcibly closed by the remote host.
              WindowsErrorCode: 0x2746
              maxToReceive: 65536
              Failed to receive data on the TCP socket
              Failed to read FTP control channel reply.
              readFtpReply: Socket fatal error.
            --readCommandResponse
          --setupPassiveDataSocket
          Failed to setup passive data socket
        --setupDataConnection
        Failed to setup data connection for download.
        readRepliesAfterFailedDataConn:
          readCommandResponse:
            Failed to read FTP control channel reply.
            readFtpReply: Socket connection closed.
          --readCommandResponse
        --readRepliesAfterFailedDataConn
      --downloadToOutput2
      downloadToOutput: Elapsed time: 18953 millisec
    --downloadToFile
    Failed.   --GetFile
--ChilkatLog

到目前为止我试过的是设置：

ftp.EnableEvents = true;
ftp.RestartNext = true;
ftp.Passive = false;
ftp.SoSndBuf = 131072;
ftp.SoRcvBuf = 131072;

还时不时打电话给ftp.Noop();，以保持联系"alive"。

我是不是遗漏了什么？

编辑：一些下载和重试的伪代码

        string fileName = _ftp.GetFilename(i);
        string remoteFilePath = sourcePath + fileName;
        string destinationFilePath = destinationPath + fileName;
        bool success = _ftp.GetFile(remoteFilePath, destinationFilePath);

        if (success)
        {
            Log($"Downloading Finished {fileName} : {DateTime.Now.ToString("HH:mm:ss")}");
        }
        else
        {
            Thread.Sleep(30000);
            success = _ftp.GetFile(remoteFilePath, destinationFilePath);
        }

Answer 1

设置 ftp.LargeFileMeasures = true 应该可以解决问题。

奇尔卡特 FTP2 下载 (GetFile) 大文件 (≈12 GB)

Chilkat FTP2 download (GetFile) large files (≈12 GB)

c#

ftp

chilkat