I'm searching for a solution in C# or else VB.Net for this problem.
Using a WebClient
I would like to retrieve the server response of UploadValuesAsync
method asynchronously but I can't figure it out how to do it.
Basically I want to do the same done in this question, get the response code as Integer (but asynchronouslly): Get Web Response Status Code properly
Example code:
The problem with the code below is the same problem exposed in the other question that I linked, it throws an exception if the e.result
property is not ok then I can't parse any other status code than a 200 code because that exception.
I've searched for a Response
property on the e.Error
exception but I didn't found anything, so I'm not able to proceed.
AddHandler wc.UploadValuesCompleted, AddressOf WC_UploadValuesCompleted
wc.UploadValuesAsync(New Uri("https://api.imgur.com/3/upload.xml"), values)
Then:
Private Sub WC_UploadValuesCompleted(ByVal sender As Object, ByVal e As UploadValuesCompletedEventArgs)
If Not e.Cancelled Then
Dim responseAsync As Byte() = e.Result
' Read the response (Converting Byte-Array to Stream).
Using sr As New StreamReader(New MemoryStream(responseAsync))
Dim serverResponse As String = sr.ReadToEnd
Dim xdoc As New XDocument(XDocument.Parse(serverResponse))
Dim status As ImgurStatus = Nothing
status = Me.GetResultFromStatus(Convert.ToInt32(xdoc.Root.LastAttribute.Value.ToString))
Select Case status
Case ImgurStatus.Success ' 200
Return New ImgurImage(New Uri(xdoc.Descendants("link").Value))
Case ImgurStatus.AccessForbidden ' 403
RaiseEvent OnAccessForbidden(Me, ImgurStatus.AccessForbidden)
Case ImgurStatus.AuthorizationFailed ' 401
RaiseEvent OnAuthorizationFailed(Me, ImgurStatus.AuthorizationFailed)
Case ImgurStatus.BadImageFormat ' 400
RaiseEvent OnBadImageFormat(Me, ImgurStatus.BadImageFormat)
Case ImgurStatus.InternalServerError ' 500
RaiseEvent OnInternalServerError(Me, ImgurStatus.InternalServerError)
Case ImgurStatus.PageIsNotFound ' 404
RaiseEvent OnPageIsNotFound(Me, ImgurStatus.PageIsNotFound)
Case ImgurStatus.UploadRateLimitError ' 429
RaiseEvent OnUploadRateLimitError(Me, ImgurStatus.UploadRateLimitError)
Case ImgurStatus.UnknownError ' -0
RaiseEvent OnUnknownError(Me, ImgurStatus.UnknownError)
Return Nothing
End Select
End Using '/ sr As New StreamReader
End If
End Sub
Below code worked for me (using Json.Net ):
async private void button1_Click(object sender, EventArgs e)
{
var response = await UploadToImgUrl(filename, client_id);
}
async Task<ImgUrl.Response> UploadToImgUrl(string fname, string client_id)
{
string endPoint = "https://api.imgur.com/3/upload";
var data = Convert.ToBase64String(File.ReadAllBytes(fname));
using (var client = new HttpClient())
{
client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", "Client-ID " + client_id);
var resp = await client.PostAsJsonAsync(endPoint, new { image = data, type= "base64", name = new FileInfo(fname).Name });
var content = await resp.Content.ReadAsStringAsync();
return JsonConvert.DeserializeObject<ImgUrl.Response>(content);
}
}
public class ImgUrl
{
public class Data
{
public string Id { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public int Datetime { get; set; }
public string Type { get; set; }
public bool Animated { get; set; }
public int Width { get; set; }
public int Height { get; set; }
public int Size { get; set; }
public int Views { get; set; }
public int Bandwidth { get; set; }
public string Deletehash { get; set; }
public string Name { get; set; }
public string Link { get; set; }
}
public class Response
{
public Data Data { get; set; }
public bool Success { get; set; }
public int Status { get; set; }
}
}
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