尽管找到了例子,但我在这方面遇到了一些麻烦。我认为这可能是编码问题,但我不确定。我正在尝试以编程方式从使用 cookie 的 https 服务器下载文件(因此我使用的是 httpwebrequest)。我正在调试打印要检查的流的容量,但输出 [原始] 文件看起来不同。尝试了其他编码无济于事。
代码:
Sub downloadzip(strURL As String, strDestDir As String)
Dim request As HttpWebRequest
Dim response As HttpWebResponse
request = Net.HttpWebRequest.Create(strURL)
request.UserAgent = strUserAgent
request.Method = "GET"
request.CookieContainer = cookieJar
response = request.GetResponse()
If response.ContentType = "application/zip" Then
Debug.WriteLine("Is Zip")
Else
Debug.WriteLine("Is NOT Zip: is " + response.ContentType.ToString)
Exit Sub
End If
Dim intLen As Int64 = response.ContentLength
Debug.WriteLine("response length: " + intLen.ToString)
Using srStreamRemote As StreamReader = New StreamReader(response.GetResponseStream(), Encoding.Default)
'Using ms As New MemoryStream(intLen)
Dim fullfile As String = srStreamRemote.ReadToEnd
Dim memstream As MemoryStream = New MemoryStream(New UnicodeEncoding().GetBytes(fullfile))
'test write out to flie
Dim data As Byte() = memstream.ToArray()
Using filestrm As FileStream = New FileStream("c:\temp\debug.zip", FileMode.Create)
filestrm.Write(data, 0, data.Length)
End Using
Debug.WriteLine("Memstream capacity " + memstream.Capacity.ToString)
'Dim strData As String = srStreamRemote.ReadToEnd
memstream.Seek(0, 0)
Dim buffer As Byte() = New Byte(2048) {}
Using zip As New ZipInputStream(memstream)
Debug.WriteLine("zip stream cap " + zip.Length.ToString)
zip.Seek(0, 0)
Dim e As ZipEntry
Dim flag As Boolean = True
Do While flag ' daft, but won't assign e=zip... tries to evaluate
e = zip.GetNextEntry
If IsNothing(e) Then
flag = False
Exit Do
Else
e.UseUnicodeAsNecessary = True
End If
If Not e.IsDirectory Then
Debug.WriteLine("Writing out " + e.FileName)
' e.Extract(strDestDir)
Using output As FileStream = File.Open(Path.Combine(strDestDir, e.FileName), _
FileMode.Create, FileAccess.ReadWrite)
Dim n As Integer
Do While (n = zip.Read(buffer, 0, buffer.Length) > 0)
output.Write(buffer, 0, n)
Loop
End Using
End If
Loop
End Using
'End Using
End Using 'srStreamRemote.Close()
response.Close()
End Sub
所以我下载了正确大小的文件,但 dotnetzip 无法识别它,并且复制出来的文件是不完整/无效的 zip。我今天大部分时间都花在这上面,准备放弃了。