Vb.net 推特上传/媒体附加

我就是不知道该怎么做追加步骤。我已经顺利完成了初始化部分，但我不知道下一步该怎么做

我现在要做的是：我构建一个授权头，只包含oauth参数和签名库，然后我将所需的参数放入body请求中：command=APPEND，INIT方法中的media\u id，带有原始二进制图像的media，而segment_index=0，因为我只需要发送一个请求，因为我的图像的大小永远不会超过30KB

我尝试了以下方法：

        Dim oHttpWebRequest As HttpWebRequest
        Dim oHttpWebResponse As HttpWebResponse
        Dim oStream As Stream
        Dim newLine As String = System.Environment.NewLine
        Dim mediaId = getINITresponse()
        Try
            oHttpWebRequest = DirectCast(WebRequest.Create("https://upload.twitter.com/1.1/media/upload.json"), HttpWebRequest)

            Dim sBody As String = buildHeader(twitter, sAuth)
            oHttpWebRequest.Headers.Add("Authorization", sBody)
            oHttpWebRequest.Method = "POST"

            Dim sBoundary As String = DateTime.Now.Ticks.ToString("x")
            Dim sStartBoundary As String = "--" + sBoundary + newLine
            Dim sEndBoundary As String = newLine + "--" + sBoundary + "--" + newLine

            oHttpWebRequest.ContentType = "multipart/form-data; boundary=" + sBoundary

            Dim sBodyData As String = ""
            Dim srequestString As New StringBuilder()
            sBodyData = "command=APPEND&media_id=" + mediaId + "&segment_index=0&media="
            srequestString.AppendLine(sStartBoundary + "Content-Disposition: form-data; name=""media""; filename=""image.jpg""" + newLine)
            srequestString.AppendLine(Encoding.Default.GetString(getBinaryFileFromPath(sFicName)))
            srequestString.AppendLine(newLine + sEndBoundary + newLine)

            Dim postData As Byte()
            postData = Text.Encoding.UTF8.GetBytes(sBodyData)
            Dim postDataBytes As Byte()
            postDataBytes = Text.Encoding.UTF8.GetBytes(srequestString.ToString()) 
            Dim byteResult() As Byte = postData.Concat(postDataBytes).ToArray()   

            oHttpWebRequest.ContentLength = byteResult.Length
            Using requestStream = oHttpWebRequest.GetRequestStream()
                requestStream.Write(byteResult, 0, byteResult.Length)
                requestStream.Close()
            End Using

            oHttpWebResponse = DirectCast(oHttpWebRequest.GetResponse(), HttpWebResponse)
            oStream = oHttpWebResponse.GetResponseStream()

            Return New StreamReader(oStream, Encoding.UTF8).ReadToEnd()

        Catch wex As WebException 'Exception venant du serveur distant
            Return New StreamReader(wex.Response.GetResponseStream()).ReadToEnd()
        End Try

我的初始化部分正在工作，我保存了媒体id并将其用于附加部分。我的图像不超过30KB，所以大小没有问题

Twitter回复我状态：400个错误请求

我不知道我做错了什么。对不起，我的英语不好

我找到了答案：

sBodyData = "command=APPEND&media_id=" + mediaId + "&segment_index=0&media="

我将我的身体数据设置为发送一个ContentType=application/x-www-form-urlencoded请求。 所以我在同一个请求中使用了这两个contentType，当然它不起作用。现在看起来是这样的：

Dim newLine As String = System.Environment.NewLine

srequestString.AppendLine(sStartBoundary + "Content-Disposition: form-data; name=""command""" + newLine)
srequestString.AppendLine("APPEND")
srequestString.AppendLine(sStartBoundary + "Content-Disposition: form-data; name=""media_id""" + newLine)
srequestString.AppendLine(mediaId)
srequestString.AppendLine(sStartBoundary + "Content-Disposition: form-data; name=""media""" + newLine)
srequestString.AppendLine(Encoding.Default.GetString(getBinaryFileFromPath(sFileName)))
srequestString.AppendLine(sStartBoundary + "Content-Disposition: form-data; name=""segment_index""" + newLine)
srequestString.AppendLine("0")
srequestString.AppendLine(sEndBoundary)