/// <summary> /// 根据URL 返回HTML /// </summary> private List<string> GetHtmlByUrl(string Url) { WebClient client = new WebClient(); byte[] page = client.DownloadData(Url); string content = System.Text.Encoding.UTF8.GetString(page); List<string> _list = GetImgUrlByHtmlText(content); return _list; }
/---------------------根据URL--获取图片信息--------------/ //后缀名 string _suffix = _imgurls[i].Substring(_imgurls[i].Length - 4); //图片文件名 string _imageInputTitle = "云鼎宝贝" + DateTime.Now.ToString("yyyyMMddhhmmss" + i) + _suffix; System.Net.HttpWebRequest webRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(_imgurls[i]); webRequest.Method = "GET"; System.Net.HttpWebResponse webResponse = (System.Net.HttpWebResponse)webRequest.GetResponse(); //获取图片保存到流 System.IO.Stream _stream = webResponse.GetResponseStream(); //保存到图片 System.Drawing.Image _image = System.Drawing.Image.FromStream(_stream); // int _picwidth = _imgWidth.Length <= 0 ? _image.Width : Convert.ToInt32(_imgWidth); // int _picheight = _imgHeight.Length <= 0 ? _image.Height : Convert.ToInt32(_imgHeight); //根据参数形成缩略图 //_image = _image.GetThumbnailImage(_image.Width, _image.Height, null, IntPtr.Zero); //实例化MemoryStream System.IO.MemoryStream _ImageMem = new System.IO.MemoryStream(); //实例化图片格式 //ImageFormat _imgFormat = new ImageFormat(new Guid()); //根据图片后缀名判断类型. // if (_suffix.ToLower().Equals(".jpg")) _imgFormat = ImageFormat.Jpeg; // if (_suffix.ToLower().Equals(".png")) _imgFormat = ImageFormat.Png; // if (_suffix.ToLower().Equals(".gif")) _imgFormat = ImageFormat.Gif; //保存 _image.Save(_ImageMem, _image.RawFormat); //转换为字节流 byte[] _ImageBytes = _ImageMem.GetBuffer(); //释放资源 _image.Dispose(); //关闭流 _stream.Close();
/------------图片生成缩略图--------------? #region 生成缩略图 ///<summary> /// 生成缩略图 /// </summary> /// <param name="originalImagePath">源图路径（物理路径）</param> /// <param name="thumbnailPath">缩略图路径（物理路径）</param> /// <param name="width">缩略图宽度</param> /// <param name="height">缩略图高度</param> /// <param name="mode">生成缩略图的方式</param> public void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode out string outthumbnailPath) { System.Drawing.Image originalImage =System.Drawing.Image.FromFile(originalImagePath); int towidth = width; int toheight = height; int x = 0; int y = 0; int ow = originalImage.Width; int oh = originalImage.Height; switch (mode) { case "HW"://指定高宽缩放（可能变形） break; case "W"://指定宽，高按比例 toheight = originalImage.Height * width/originalImage.Width; break; case "H"://指定高，宽按比例 towidth = originalImage.Width * height/originalImage.Height; break; case "Cut"://指定高宽裁减（不变形） if((double)originalImage.Width/(double)originalImage.Height > (double)towidth/(double)toheight) { oh = originalImage.Height; ow = originalImage.Height*towidth/toheight; y = 0; x = (originalImage.Width - ow)/2; } else { ow = originalImage.Width; oh = originalImage.Width*height/towidth; x = 0; y = (originalImage.Height - oh)/2; } break; default : break; } //新建一个bmp图片 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth,toheight); //新建一个画板 Graphics g = System.Drawing.Graphics.FromImage(bitmap); //设置高质量插值法 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量,低速度呈现平滑程度 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(Color.Transparent); //在指定位置并且按指定大小绘制原图片的指定部分 g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight), new Rectangle(x, y, ow,oh), GraphicsUnit.Pixel); try { //以jpg格式保存缩略图 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); outthumbnailPath=thumbnailPath; } catch(System.Exception e) { throw e; } finally { originalImage.Dispose(); bitmap.Dispose(); g.Dispose(); } }
