/// <SUMMARY> /// 下載保存多媒體文件,返回多媒體保存路徑 /// </SUMMARY> /// <PARAM name="ACCESS_TOKEN"></PARAM> /// <PARAM name="MEDIA_ID"></PARAM> /// <RETURNS></RETURNS> public string GetMultimedia(HttpContext context){ //下面都是為了獲取微信token，我是存在xml中的。string filepath = HttpContext.Current.Server.MapPath("/AK.xml");StreamReader str = new StreamReader(filepath, System.Text.Encoding.UTF8);XmlDocument xml = new XmlDocument();xml.Load(str);str.Close();str.Dispose();var Token = xml.SelectSingleNode("xml").SelectSingleNode("Access_Token").InnerText;string file = string.Empty;string content = string.Empty;string strpath = string.Empty;string savepath = string.Empty;string MEDIA_ID = context.Request["MEDIA_ID"];//上面都是為了獲取token MEDIA_ID是微信的文件ID，需要在前臺用wx.uploadVoice上傳string stUrl = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=" + Token + "&media_id=" + MEDIA_ID;HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(stUrl);req.Method = "GET";using (WebResponse wr = req.GetResponse()){HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse();strpath = myResponse.ResponseUri.ToString();//WebClient mywebclient = new WebClient();string basePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "file", "VoiceCard");HttpCookie mycookie = context.Request.Cookies[CommManage.hd_cookie_name];string openId = mycookie.Value;var fileName = openId + new Random().Next(1000, 9999);savepath = Path.Combine(basePath , fileName + ".amr");try{//mywebclient.DownloadFile(strpath, savepath);DownLoad(strpath, savepath, "audio/amr");///amr轉換成MP3格式//mywebclient.DownloadFileCompleted += new AsyncCompletedEventHandler(webClient_DownloadFileCompleted) ;//Thread.Sleep(5000);//把從微信下載的文件轉成mp3格式，如果要在h5頁面里聽需要轉換，如果只是簡單下載則不需要轉碼ConvertToAmr(Path.Combine(basePath, fileName + ".amr"),Path.Combine(basePath, fileName + ".mp3"));//轉換成功后保存hd_join_user my_model = main_db.hd_join_user.FirstOrDefault(p => p.open_id == openId && p.hd_code == VoiceCardManage.hd_code);var voice = new hd_articlevote_images();voice.article_code = my_model.id.ToString();voice.images = fileName + ".mp3";voice.hd_code = VoiceCardManage.hd_code;main_db.SaveChanges();return fileName + ".mp3";}catch (Exception ex){savepath = ex.ToString();Log.Error("bug" , ex.ToString().Substring(0,100));return "";}}}

上面是從微信端下載音頻文件，其他文件也是類似

//下載文件public static bool DownLoad(string url, string path, string contentType){try{HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);req.ServicePoint.Expect100Continue = false;req.Method = "GET";req.KeepAlive = true;req.ContentType = contentType;// "image/png";using (HttpWebResponse rsp = (HttpWebResponse)req.GetResponse()){using (Stream reader = rsp.GetResponseStream()){using (FileStream writer = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write)){byte[] buff = new byte[512];int c = 0; //實際讀取的字節數while ((c = reader.Read(buff, 0, buff.Length)) > 0){writer.Write(buff, 0, c);}}}}return true;}catch (Exception e){return false;}}

amr格式轉成MP3

/// <summary>/// 將amr音頻轉成mp3手機音頻/// </summary>/// <param name="applicationPath">ffmeg.exe文件路徑</param>/// <param name="fileName">amr文件的路徑(帶文件名)</param>/// <param name="targetFilName">生成目前mp3文件路徑（帶文件名）</param>/// string c 里面的ffmpeg.exe需要下載這個文件，路徑是ffmpeg.exe的文件路勁public void ConvertToAmr( string fileName, string targetFilName){ string c = @"G:\toolsZ\ffmpeg64\bin" + @"\ffmpeg.exe -i " + fileName + " " + targetFilName;c = c.Replace("//", "\\").Replace("/", "\\");Log.Info("ff", c);Cmd(c);}

打開ffmpeg.exe文件需要打開cmd.exe

/// <summary>/// 執行Cmd命令/// </summary>private void Cmd(string c){try{process = new System.Diagnostics.Process();process.StartInfo.FileName = "cmd.exe";process.StartInfo.UseShellExecute = false;process.StartInfo.CreateNoWindow = true;process.StartInfo.RedirectStandardOutput = true;process.StartInfo.RedirectStandardInput = true;process.Start();process.StandardInput.WriteLine(c);process.StandardInput.AutoFlush = true;process.StandardInput.WriteLine("exit");StreamReader reader = process.StandardOutput;//截取輸出流 //process.StandardInput.Flush();//process.StandardInput.Close();process.WaitForExit();}catch{ }}

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