VB.NET POST图片到 asp.net页面,是否用request.form["file"]取,如果是为什么会乱码~如果是编码问题那又怎么解决呢???现附上vb.net源码,,,帅哥哥们帮一下小弟吧.....
Public Function postCaptcha(ByVal strApiKey As String, ByVal strCaptchaFile As String) As StringDim objEncoding As New System.Text.UTF8Encoding
Dim objStreamWriter As System.IO.StreamWriter
Dim objStream As System.IO.Stream
Dim objHTTPRequest As HttpWebRequest
Dim sbPostData As New System.Text.StringBuilder
Dim intUploadBit As Integer
Dim intUploadSoFar As Integer
Dim inttoUpload As Integer
Dim i As Integer
Dim objStreamReader As System.IO.Stream
Dim strResult As String
'set request properties
objHTTPRequest = System.Net.WebRequest.Create("http://www.captch易做图.com/api.aspx")
objHTTPRequest.AllowAutoRedirect = True
objHTTPRequest.Accept = "*/*"
objHTTPRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)"
objHTTPRequest.KeepAlive = False
objHTTPRequest.Timeout = 30000
objHTTPRequest.Method = "POST"
objHTTPRequest.ContentType = "multipart/form-data; boundary=7cf2a327f01ae"
sbPostData.Append("--" + "7cf2a327f01ae" + vbCrLf)
sbPostData.Append("Content-Disposition: form-data; name=""api_key""" + vbCrLf)
sbPostData.Append(vbCrLf)
sbPostData.Append(strApiKey + vbCrLf)
sbPostData.Append("--" + "7cf2a327f01ae" + vbCrLf)
sbPostData.Append("Content-Disposition: form-data; name=""expire""" + vbCrLf)
sbPostData.Append(vbCrLf)
sbPostData.Append("1000" + vbCrLf) 'defaulted to 1000 but you can change this
sbPostData.Append("--" + "7cf2a327f01ae" + vbCrLf)
sbPostData.Append("Content-Disposition: form-data; name=""method""" + vbCrLf)
sbPostData.Append(vbCrLf)
sbPostData.Append("upload_captcha" + vbCrLf)
sbPostData.Append("--" + "7cf2a327f01ae" + vbCrLf)
sbPostData.Append("Content-Disposition: form-data; name=""rights""" + vbCrLf)
sbPostData.Append(vbCrLf)
sbPostData.Append("false" + vbCrLf) 'defaulted to false but you can change this
'this is the header for our captcha file upload
sbPostData.Append("--" + "7cf2a327f01ae" + vbCrLf)
sbPostData.Append("Content-Disposition: form-data; name=""file""; filename=""" & strCaptchaFile & "" + vbCrLf)
sbPostData.Append("Content-Type: image/pjpeg" + vbCrLf)
sbPostData.Append(vbCrLf)
'read our captch into a byte array
Dim objBinReader As New BinaryReader(File.OpenRead(strCaptchaFile))
Dim bytPhotoContents As Byte() = objBinReader.ReadBytes(objBinReader.BaseStream.Length)
objBinReader.Close()
'convert our other post data into a byte array
Dim bytPostContents As Byte() = objEncoding.GetBytes(sbPostData.ToString)
'create a footer for insertation after the file bytes are uploaded
Dim bytPostFooter As Byte() = objEncoding.GetBytes(vbCrLf + "--" + "7cf2a327f01ae" + vbCrLf)
'create a new data buffer to hold all of our byte arrays
Dim bytDataBuffer As Byte() = New Byte(bytPostContents.Length + bytPhotoContents.Length + bytPostFooter.Length) {}
'copy the contents of our three byte arrays into our single byte array
System.Buffer.BlockCopy(bytPostContents, 0, bytDataBuffer, 0, bytPostContents.Length)
System.Buffer.BlockCopy(bytPhotoContents, 0, bytDataBuffer, bytPostContents.Length, bytPhotoContents.Length)
System.Buffer.BlockCopy(bytPostFooter, 0, bytDataBuffer, bytPostContents.Length + bytPhotoContents.Length, bytPostFooter.Length)
'set the content length based on our new byte array length
objHTTPRequest.ContentLength = bytDataBuffer.Length
'get our stream and post our data
objStream = objHTTPRequest.GetRequestStream()
'chunk up our data and upload it to our stream
'will generally only need to send in one chunk unless file is large
intUploadBit = Math.Max(bytDataBuffer.Length / 100, 50 * 1024)
intUploadSoFar = 0
While i < bytDataBuffer.Length
inttoUpload = Math.Min(intUploadBit, bytDataBuffer.Length - i)
intUploadSoFar += inttoUpload
objStream.Write(bytDataBuffer, i, inttoUpload)
i = i + intUploadBit
End While
'close our stream
objStream.Close()
'get the response from the server
Dim objHTTPResponse As HttpWebResponse = CType(objHTTPRequest.GetResponse(), HttpWebResponse)
objStreamReader = objHTTPResponse.GetResponseStream()
'final result from server is returned to strResult
Dim objStreamResult As New System.IO.StreamReader(objStreamReader)
strResult = objStreamResult.ReadToEnd
'close our objects
objStreamReader.Close()
objStreamResult.Close()
Return strResult
End Function
//以下为调用源码
Private Sub btnPostCaptcha_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPostCaptcha.Click
If txtAPIKey.Text = "" Or txtCaptchaImage.Text = "" Then
MsgBox("API Key and Captcha Image file must be specified")
Exit Sub
End If
txtCaptchaID.Text = postCaptcha(txtAPIKey.Text, txtCaptchaImage.Text)
'strip out our sucess indicator to just get the captcha ID
If InStr(txtCaptchaID.Text, "SUCCESS: captcha_id=", CompareMethod.Text) > 0 Then
txtCaptchaID.Text = Replace(txtCaptchaID.Text, "SUCCESS: captcha_id=", "")
txtCaptchaID.Text = Replace(txtCaptchaID.Text, vbCr, "")
txtCaptchaID.Text = Replace(txtCaptchaID.Text, vbLf, "")
cmdGetResult.Enabled = True
Else
MsgBox("Error uploading captcha. API Result: " & txtCaptchaID.Text)
cmdGetResult.Enabled = False
End If
End Sub --------------------编程问答-------------------- nal result from server is returned to strResult
Dim objStreamResult As New System.IO.StreamReader(objStreamReader,Encoding.GetEncoding("GB2312"))
strResult = objStreamResult.ReadToEnd
指定格式就可以了 --------------------编程问答-------------------- 谢谢你,但是在asp.net是怎么还原的呢?????是用request.form["file"].tostring()这这样吗?
补充：.NET技术 , C#
