使用WebClient在PowerShell脚本中将FTP从二进制更改为ascii

Question

简单的PowerShell脚本。它下载一个没有问题的文件（二进制文件）。我需要它在ascii。

$File = "c:\temp\ftpfile.txt" 
$ftp = "ftp://myusername:mypass@12.345.6.78/'report'"; 
$webclient = New-Object -TypeName System.Net.WebClient; 
$uri = New-Object -TypeName System.Uri -ArgumentList $ftp; 
$webclient.DownloadFile($uri, $File); 

Answer 1

WebClient不支持ascii/text FTP模式。

改为使用FtpWebRequest，并将.UseBinary设置为false。

$File = "c:\temp\ftpfile.txt" 
$ftp = "ftp://myusername:mypass@12.345.6.78/'report'"; 

$ftprequest = [System.Net.FtpWebRequest]::Create($ftp) 

$ftprequest.Method = [System.Net.WebRequestMethods+Ftp]::DownloadFile 
$ftprequest.UseBinary = $false 

$ftpresponse = $ftprequest.GetResponse() 

$responsestream = $ftpresponse.GetResponseStream() 

$targetfile = New-Object IO.FileStream($File, [IO.FileMode]::Create) 
[byte[]]$readbuffer = New-Object byte[] 1024 

do 
{ 
    $readlength = $responsestream.Read($readbuffer, 0, 1024) 
    $targetfile.Write($readbuffer, 0, $readlength) 
} 
while ($readlength -ne 0) 

$targetfile.close() 

参考：What's the best way to automate secure FTP in PowerShell?

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注意，WebClient内部使用的FtpWebRequest，但不公开其.UseBinary财产。