常见问题FAQ

问：通过Face++ API上传图片的规格有什么要求吗？

答：有。图片文件大小不能超过3MB，可以是.jpg，.png，.gif等常见格式。但如果上传动态GIF，只会处理第一帧。此外，上传图片会被标准化为600*600像素的大小再进行后续计算。

问：通过HTTP POST方法上传图片时，有什么注意事项吗？

答： 通过 POST 上传图片时，发送的数据请使用 multipart/form-data 编码。事实上，目前所有API都接受GET求和以 multipart/form-data 或 application/x-www-form-urlencoded 编码的 POST 请求。

以上是官网的解答，应该可以上传图片到他们的服务器吧？

    \'正好前段时间开发一个IOS的APP后台接口,给你一段代码吧

    \'客户端HttpWebPost上传文件代码,在Visual studio 2010中写的,要放进Foxtable需要加一下命名空间

    Public Function HttpPostFile(ByVal url As String,
                                 ByVal timeOut As Integer,
                                 ByVal dicFile As Dictionary(Of String, String))

        Dim responseContent As String
        Dim memStream As New MemoryStream
        Dim webRequest As HttpWebRequest = HttpWebRequest.Create(url)
        \'边界符
        Dim boundary As String = "---------------" + DateTime.Now.Ticks.ToString("x")
        Dim beginBoundary As Byte() = Encoding.ASCII.GetBytes("--" & boundary & vbCrLf)
        Dim endBoundary As Byte() = Encoding.ASCII.GetBytes(vbCrLf & "--" & boundary & "--")

        Dim fileStream As FileStream = New FileStream(dicFile("img1"), FileMode.Open, FileAccess.Read)

        \'设置属性
        webRequest.Method = "POST"
        webRequest.Timeout = timeOut
        webRequest.C & boundary

        memStream.Write(beginBoundary, 0, beginBoundary.Length)

        \'写入文件1
        Dim header As String = "Content-Disposition: form-data; name=""img1"";filename=""" & FileIO.FileSystem.GetName(dicFile("img1")) & """" & vbCrLf &
                                "Content-Type: application/-image" & vbCrLf & vbCrLf
        Dim headerbytes As Byte() = Encoding.UTF8.GetBytes(header)
        memStream.Write(headerbytes, 0, headerbytes.Length)

        Dim buffer(1024) As Byte
        Dim bytesRead As Integer = fileStream.Read(buffer, 0, buffer.Length)
        While bytesRead > 0
            memStream.Write(buffer, 0, bytesRead)
            bytesRead = fileStream.Read(buffer, 0, buffer.Length)
        End While

        memStream.Write(Encoding.ASCII.GetBytes(vbCrLf & "--" & boundary & vbCrLf), 0, beginBoundary.Length)

        \'写入文件2
        header = vbCrLf & "Content-Disposition: form-data; name=""img2"";filename=""" & FileIO.FileSystem.GetName(dicFile("img2")) & """" & vbCrLf &
                                "Content-Type: application/-image" & vbCrLf & vbCrLf
        headerbytes = Encoding.UTF8.GetBytes(header)
        memStream.Write(headerbytes, 0, headerbytes.Length)
        fileStream = New FileStream(dicFile("img1"), FileMode.Open, FileAccess.Read)
        bytesRead = fileStream.Read(buffer, 0, buffer.Length)
        While bytesRead > 0
            memStream.Write(buffer, 0, bytesRead)
            bytesRead = fileStream.Read(buffer, 0, buffer.Length)
        End While

        \'写入最后的结束边界符
        memStream.Write(endBoundary, 0, endBoundary.Length)
        webRequest.ContentLength = memStream.Length
        Dim requestStream As Stream = webRequest.GetRequestStream
        memStream.Position = 0
        Dim tempBuffer(memStream.Length - 1) As Byte
        memStream.Read(tempBuffer, 0, tempBuffer.Length)
        memStream.Close()

        requestStream.Write(tempBuffer, 0, tempBuffer.Length)
        requestStream.Close()

        Dim httpWebResponse As WebResponse = webRequest.GetResponse
        Using httpStreamReader As New StreamReader(httpWebResponse.GetResponseStream, Encoding.GetEncoding("utf-8"))
            responseContent = httpStreamReader.ReadToEnd
        End Using
        fileStream.Close()
        httpWebResponse.Close()
        webRequest.Abort()

        Return responseContent

    End Function