/// <summary> /// Retrieve an image (i.e. download an image to your computer) /// </summary> /// <param name="imageId">The id of the image to download</param> /// <param name="filename">The full path and filename to save the downloaded image as</param> /// <param name="progressEventHandler">The event handler to call with progress updates</param> /// <remarks>Requires the API Key to have LEGACY access enabled</remarks> public async Task ImageRetrieveAsync(int imageId, string filename, EventHandler <ImageRetrieveProgressChangedEventArgs> progressEventHandler) { var ImageDetails = await this.ImageDetailsAsync(imageId); using (NoKeepAlivesWebClient WC = new NoKeepAlivesWebClient()) { WC.Proxy = null; if (progressEventHandler != null) { WC.DownloadProgressChanged += (s, e) => { progressEventHandler(s, new ImageRetrieveProgressChangedEventArgs(e.BytesReceived, e.TotalBytesToReceive > 0 ? e.TotalBytesToReceive : ImageDetails.size)); }; } Uri RetrieveImageUrl = new Uri($"{BASE_URL_LEGACY}?category=image&action=retrieve&image_id={imageId}&api_id={_APIId}&api_key={_APIKey}"); await WC.DownloadFileTaskAsync(RetrieveImageUrl, filename); // TODOX Final progressEventHandler() call would be good, but how to know how many bytes were received/expected? // Without final call program displays - Downloaded 28,180,193,280 of 28,182,839,296 bytes (99.99 %)... // Check for JSON indicating a failure try { if (File.Exists(filename)) { FileInfo FI = new FileInfo(filename); if (FI.Length < 1024) { string FileContents = File.ReadAllText(filename); BaseResponseModel BRM = (new JavaScriptSerializer()).Deserialize <BaseResponseModel>(FileContents); if (BRM.success != "yes") { throw new LNDException(BRM.error); } } } } catch (LNDException) { // Re-throw the LNDException so the caller knows the retrieve failed throw; } catch { // If it happened to be a REALLLLY small image (<1024 bytes), then DeserializeObject() will throw // an exception. The File.ReadAllText() could also throw an exception if the file happened to be // locked by another process right after the download finished. // We're going to ignore these types of exceptions, with the assumption that the image downloaded // successfully } } }
private async Task <T> RequestAsync <T>(string category, string action, BaseRequestModel requestModel) { using (NoKeepAlivesWebClient WC = new NoKeepAlivesWebClient()) { WC.Proxy = null; var Serializer = new JavaScriptSerializer(); requestModel.api_id = _APIId; requestModel.api_partialkey = _APIKey.Substring(0, 64); string ModelData = Serializer.Serialize(requestModel); int Nonce = (int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds; // https://dzone.com/articles/get-unix-epoch-time-one-line-c string Signature = hash_hmac_sha512($"{category}/{action}/|{ModelData}|{Nonce.ToString()}", _APIKey); NameValueCollection RequestData = new NameValueCollection() { { "req", ModelData }, { "signature", Signature }, { "nonce", Nonce.ToString() } }; Uri RequestUrl = new Uri(DYNAMIC_URL.Replace("{CATEGORY}", category).Replace("{ACTION}", action)); string ResponseText = Encoding.UTF8.GetString(await WC.UploadValuesTaskAsync(RequestUrl, "POST", RequestData)); //if (Debugger.IsAttached) //{ // string LogFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "lndapi.log"); // File.AppendAllText(LogFilename, $"{category}/{action}{Environment.NewLine}{ModelData}{Environment.NewLine}{ResponseText}{Environment.NewLine}{Environment.NewLine}"); //} BaseResponseModel BRM = Serializer.Deserialize <BaseResponseModel>(ResponseText); if (BRM.success == "yes") { return(Serializer.Deserialize <T>(ResponseText)); } else { throw new LNDException(BRM.error); } } }