Connecting to and uploading tracks with Soundcloud API using C# .NET

Question

I'm trying to upload an audio track to the Soundcloud.com using C#.NET, but there aren't any resources for .NET anywhere. Could someone post a link or an example of how to upload an audio file to my Soundcloud.com account using .NET?

Thank you, Arman

Answer 1

To upload an audio using soundcloud's REST API you need to take care of HTTP POST related issues (RFC 1867). In general, ASP.NET does not support sending of multiple files/values using POST, so I suggest you to use Krystalware library: http://aspnetupload.com/Upload-File-POST-HttpWebRequest-WebClient-RFC-1867.aspx

After that you need to send proper form fields to the https://api.soundcloud.com/tracks url:

• Auth token (oauth_token)
• Track Title (track[title])
• The file (track[asset_data])

Sample code:

using Krystalware.UploadHelper;
...

System.Net.ServicePointManager.Expect100Continue = false;
var request = WebRequest.Create("https://api.soundcloud.com/tracks") as HttpWebRequest;
//some default headers
request.Accept = "*/*";
request.Headers.Add("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.3");
request.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");
request.Headers.Add("Accept-Language", "en-US,en;q=0.8,ru;q=0.6");

//file array
var files = new UploadFile[] { 
    new UploadFile(Server.MapPath("Downloads//0.mp3"), "track[asset_data]", "application/octet-stream") 
};
//other form data
var form = new NameValueCollection();
form.Add("track[title]", "Some title");
form.Add("track[sharing]", "private");
form.Add("oauth_token", this.Token);
form.Add("format", "json");

form.Add("Filename", "0.mp3");
form.Add("Upload", "Submit Query");
try
{
    using (var response = HttpUploadHelper.Upload(request, files, form))
    {
        using (var reader = new StreamReader(response.GetResponseStream()))
        {
            lblInfo.Text = reader.ReadToEnd();
        }
    }
}
catch (Exception ex)
{
    lblInfo.Text = ex.ToString();
}

The example code allows you to upload an audio file from the server (notice the Server.MapPath method to form path to the file) and to get a response in json format (reader.ReadToEnd)

Answer 2

Here is a code snippet to upload track via the SoundCloud API =>

        using (HttpClient httpClient = new HttpClient()) {
            httpClient.DefaultRequestHeaders.ConnectionClose = true;
            httpClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("MySoundCloudClient", "1.0"));
            httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("OAuth", "MY_AUTH_TOKEN");
            ByteArrayContent titleContent = new ByteArrayContent(Encoding.UTF8.GetBytes("my title"));
            ByteArrayContent sharingContent = new ByteArrayContent(Encoding.UTF8.GetBytes("private"));
            ByteArrayContent byteArrayContent = new ByteArrayContent(File.ReadAllBytes("MYFILENAME"));
            byteArrayContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            MultipartFormDataContent content = new MultipartFormDataContent();
            content.Add(titleContent, "track[title]");
            content.Add(sharingContent, "track[sharing]");
            content.Add(byteArrayContent, "track[asset_data]", "MYFILENAME");
            HttpResponseMessage message = await httpClient.PostAsync(new Uri("https://api.soundcloud.com/tracks"), content);

            if (message.IsSuccessStatusCode) {
                ...
            }