C#開發(fā)微信門戶及應(yīng)用(26)-公眾號(hào)微信素材管理
2021-07-25 17:27:27

        /// <summary>
        /// 上傳的臨時(shí)多媒體文件。格式和大小限制，如下：
        /// 圖片（image）: 1M，支持JPG格式
        /// 語音（voice）：2M，播放長(zhǎng)度不超過60s，支持AMRMP3格式
        /// 視頻（video）：10MB，支持MP4格式
        /// 縮略圖（thumb）：64KB，支持JPG格式。
        /// 媒體文件在后臺(tái)保存時(shí)間為3天，即3天后media_id失效。
        /// </summary>
        /// <param name="accessToken">調(diào)用接口憑證</param>
        /// <param name="type">媒體文件類型，分別有圖片（image）、語音（voice）、視頻（video）和縮略圖（thumb）</param>
        /// <param name="file">form-data中媒體文件標(biāo)識(shí)，有filename、filelength、content-type等信息</param>
        /// <returns></returns>
        UploadJsonResult UploadTempMedia(string accessToken, UploadMediaFileType type, string file);

        public UploadJsonResult UploadTempMedia(string accessToken, UploadMediaFileType type, string file)
        {
            string url = string.Format("http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token={0}&type={1}", accessToken, type.ToString());

            UploadJsonResult result = JsonHelper<UploadJsonResult>.PostFile(url, file);
            return result;
        }

        /// <summary>
        /// 提交文件并解析返回的結(jié)果
        /// </summary>
        /// <param name="url">提交文件數(shù)據(jù)的鏈接地址</param>
        /// <param name="file">文件地址</param>
        /// <returns></returns>
        public static T PostFile(string url, string file, NameValueCollection nvc = null)
        {
            HttpHelper helper = new HttpHelper();
            string content = helper.PostStream(url, new string[] { file }, nvc);
            VerifyErrorCode(content);

            T result = JsonConvert.DeserializeObject<T>(content);
            return result;
        }

    /// <summary>
    /// 上傳多媒體文件的返回結(jié)果
    /// </summary>
    public class UploadJsonResult : BaseJsonResult
    {
        /// <summary>
        /// 媒體文件類型，分別有圖片（image）、語音（voice）、視頻（video）和縮略圖（thumb，主要用于視頻與音樂格式的縮略圖）
        /// </summary>
        public UploadMediaFileType type { get; set; }

        /// <summary>
        /// 媒體文件上傳后，獲取時(shí)的唯一標(biāo)識(shí)
        /// </summary>
        public string media_id { get; set; }

        /// <summary>
        /// 媒體文件上傳時(shí)間戳
        /// </summary>
        public long created_at { get; set; }
    }

        private void btnUpload_Click(object sender, EventArgs e)
        {
            string file = FileDialogHelper.OpenImage(false);
            if (!string.IsNullOrEmpty(file))
            {
                IMediaApi mediaBLL = new MediaApi();
                UploadJsonResult result = mediaBLL.UploadTempMedia(token, UploadMediaFileType.image, file);
                if (result != null)
                {
                    this.image_mediaId = result.media_id;
                    Console.WriteLine("{0} {1}", result.media_id, result.created_at);
                }
                else
                {
                    Console.WriteLine("上傳文件失敗");
                }
            }
        }

        /// <summary>
        /// 獲取臨時(shí)素材
        /// </summary>
        /// <param name="accessToken">調(diào)用接口憑證</param>
        /// <param name="mediaId">媒體文件ID</param>
        /// <param name="stream"></param>
        Stream GetTempMedia(string accessToken, string mediaId, ref string fileName);

        /// <summary>
        /// 獲取臨時(shí)素材
        /// </summary>
        /// <param name="accessToken">調(diào)用接口憑證</param>
        /// <param name="mediaId">媒體文件ID</param>
        /// <param name="stream"></param>
        public Stream GetTempMedia(string accessToken, string mediaId, ref string fileName)
        {
            string url = string.Format("http://file.api.weixin.qq.com/cgi-bin/media/get?access_token={0}&media_id={1}", accessToken, mediaId);

            HttpHelper helper = new HttpHelper();
            Stream stream = helper.GetStream(url, ref fileName, null);
            return stream;
        }

        private void btnDownload_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(image_mediaId))
            {
                IMediaApi mediaBLL = new MediaApi();

                string fileName = "";
                Stream stream = mediaBLL.GetTempMedia(token, image_mediaId, ref fileName);
                if (stream != null)
                {
                    string filePath = Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory, fileName);
                    using (var fileStream = File.Create(filePath))
                    {
                        byte[] buffer = new byte[1024];
                        int bytesRead = 0;
                        while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0)
                        {
                            fileStream.Write(buffer, 0, bytesRead);
                        }
                        fileStream.Flush();
                    }
                    stream.Close();
                }
                Console.WriteLine("下載文件：" + (File.Exists(fileName) ? "成功" : "失敗"));
            }
        }

        /// <summary>
        /// 新增永久圖文素材
        /// </summary>
        /// <param name="accessToken">調(diào)用接口憑證</param>
        /// <param name="newsList">圖文消息組</param>
        /// <returns></returns>
        MaterialResult UploadMaterialNews(string accessToken, List<NewsUploadJson> newsList);

        /// <summary>
        /// 新增其他類型永久素材(圖片（image）、語音（voice）和縮略圖（thumb）)
        /// </summary>
        /// <param name="accessToken">調(diào)用接口憑證</param>
        /// <param name="type">媒體文件類型，分別有圖片（image）、語音（voice）、視頻（video）和縮略圖（thumb）</param>
        /// <param name="file">form-data中媒體文件標(biāo)識(shí)，有filename、filelength、content-type等信息</param>
        /// <returns></returns>
        MaterialResult UploadMaterialMedia(string accessToken, UploadMediaFileType type, string file);

        /// <summary>
        /// 在上傳視頻素材時(shí)需要POST另一個(gè)表單，id為description，包含素材的描述信息，內(nèi)容格式為JSON.
        /// </summary>
        /// <param name="accessToken">調(diào)用接口憑證</param>
        /// <param name="file">form-data中媒體文件標(biāo)識(shí)，有filename、filelength、content-type等信息</param>
        /// <param name="title">視頻標(biāo)題</param>
        /// <param name="introduction">視頻描述</param>
        /// <returns></returns>
        MaterialResult UploadMaterialVideo(string accessToken, string file, string title, string introduction);

        /// <summary>
        /// 新增其他類型永久素材(圖片（image）、語音（voice）和縮略圖（thumb）)
        /// </summary>
        /// <param name="accessToken">調(diào)用接口憑證</param>
        /// <param name="type">媒體文件類型，分別有圖片（image）、語音（voice）、視頻（video）和縮略圖（thumb）</param>
        /// <param name="file">form-data中媒體文件標(biāo)識(shí)，有filename、filelength、content-type等信息</param>
        /// <returns></returns>
        public MaterialResult UploadMaterialMedia(string accessToken, UploadMediaFileType type, string file)
        {
            string url = string.Format("http://api.weixin.qq.com/cgi-bin/material/add_material?access_token={0}&type={1}", accessToken, type.ToString());

            MaterialResult result = JsonHelper<MaterialResult>.PostFile(url, file);
            return result;
        }