使用 SSH.NET 库从 SFTP 下载文件 [英] Download files from SFTP with SSH.NET library

问题描述

string host = @"ftphost";
string username = "user";
string password = "********";
string localFileName  = System.IO.Path.GetFileName(@"localfilename");
string remoteDirectory = "/export/";
using (var sftp = new SftpClient(host, username, password))
{
    sftp.Connect();
    var files = sftp.ListDirectory(remoteDirectory);
    foreach (var file in files)
    {
        if (!file.Name.StartsWith("."))
        {
            string remoteFileName = file.Name;
            if (file.LastWriteTime.Date == DateTime.Today)

            Console.WriteLine(file.FullName);

            File.OpenWrite(localFileName);

            string sDir = @"localpath";

            Stream file1 = File.OpenRead(remoteDirectory + file.Name);
            sftp.DownloadFile(remoteDirectory, file1);
        }
    }
}

我使用 SSH.NET (Renci.SshNet) 库来处理 SFTP 服务器.我需要做的是根据今天的日期从 SFTP 服务器上的特定文件夹中抓取文件.然后将这些文件从 SFTP 服务器复制到我的服务器的本地驱动器.

I am using SSH.NET (Renci.SshNet) library to work with an SFTP server. What I need to do is grab files from a specific folder on the SFTP server based on today's date. Then copy those files from the SFTP server to a local drive a server of mine.

上面是我的代码，但它不起作用.有时它说文件不存在，但有时我要下载的文件不会在我的本地服务器上，但我需要下载当天上传到远程文件夹的任何文件.

Above is the code I have but it is not working. Sometimes it says file does not exist but sometimes the files I will be downloading will not be on my local servers but I need to download whatever files were uploaded to the remote folder for that day.

有人可以看看有什么问题吗?我相信这与流部分有关.除了上传文件之外，我还使用了 FTP，我使用了一些以前的代码，并认为我可以逆转该过程，但这不起作用.我使用的代码基于此示例.>

Can someone take a look and see what is wrong? I believe it has something to do with the stream portion. I have worked with FTP much besides uploading files which I took some previous code I had and thought I could reverse the process but that isn't working. The code I used is based off of this example.

推荐答案

使用 SSH.NET 库下载文件的简单工作代码是:

A simple working code to download a file with SSH.NET library is:

using (Stream fileStream = File.Create(@"C:	argetlocalpathfile.zip"))
{
    sftp.DownloadFile("/source/remote/path/file.zip", fileStream);
}

另请参阅在 C# 中使用 SSH.NET SFTP 下载目录.

解释一下，为什么你的代码不起作用:

SftpClient.DownloadFile 的第二个参数是写入下载内容的流.

The second parameter of SftpClient.DownloadFile is a stream to write a downloaded contents to.

您传入的是读流而不是写流.此外，您打开读取流的路径是远程路径，不能与仅对本地文件进行操作的 File 类一起使用.

You are passing in a read stream instead of a write stream. And moreover the path you are opening read stream with is a remote path, what cannot work with File class operating on local files only.

只需丢弃 File.OpenRead 行并使用先前 File.OpenWrite 调用的结果(您现在根本没有使用):

Just discard the File.OpenRead line and use a result of previous File.OpenWrite call instead (that you are not using at all now):

Stream file1 = File.OpenWrite(localFileName);

sftp.DownloadFile(file.FullName, file1);

或者更好的是，使用 File.Create 丢弃本地文件可能具有的任何先前内容.

Or even better, use File.Create to discard any previous contents that the local file may have.

我不确定您的 localFileName 是否应该包含完整路径，或者只是文件名.因此，如有必要，您可能还需要添加路径(将 localFileName 与 sDir 组合?)

I'm not sure if your localFileName is supposed to hold full path, or just file name. So you may need to add a path too, if necessary (combine localFileName with sDir?)

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