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);
        }
    }
}

我正在使用SSH.NET （ Renci.SshNet ）库与SFTP服务器一起使用。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。然后将那些文件从SFTP服务器复制到我的服务器的本地驱动器上。

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，但是没有用。有时它说文件不存在，但是有时我要下载的文件将不在本地服务器上，但是我需要下载当天上传到远程文件夹的所有文件。

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.

有人可以看一下，看看有什么问题吗？我认为这与流部分有关。除了上传文件之前，我已经使用FTP进行了很多工作，而这些文件是我以前使用的一些代码，并认为我可以逆转该过程，但是那是行不通的。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:\target\local\path\file.zip"))
{
    sftp.DownloadFile("/source/remote/path/file.zip", fileStream);
}

另请参见在C＃中使用SSH.NET SFTP下载目录。

See also Downloading a directory using SSH.NET SFTP in C#.

为了解释，为什么您的代码无法正常工作：

SftpClient.DownloadFile 是用于将下载内容写入其中的流。

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

您正在传递的是读取流，而不是写入流。而且，您打开读取流所使用的路径是一个远程路径，对于仅在本地文件上运行的 File 类是不起作用的。

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，并使用上一个 File.OpenWrite 调用（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);

甚至更好，使用 File.Create 放弃本地文件以前可能拥有的任何内容。

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

我不确定您的 localFileName 应该包含完整路径，或仅包含文件名。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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