qt5 传输 图片压缩_FileUpload上传并压缩图片的几种方法（方法转）

1 private bool UploadImg(FileUpload FileUpload, string FilePath, stringimagess)2 {3 //string fileExtends = "";

4 if (FileUpload.FileName.Trim().Length > 0)5 {6 string fileExt =System.IO.Path.GetExtension(FileUpload.FileName);7 if (fileExt == ".jpg" || fileExt == ".gif" || fileExt == ".png" || fileExt == "ico")8 {9 try

10 {11 if (FileUpload.PostedFile.ContentLength < 1048576)12 {13

14 //FileInfo fileinfo = new FileInfo(FileUpload.PostedFile.FileName);15 //FileUpload.SaveAs(Server.MapPath(FilePath + imagess));

16 System.Drawing.Image image = System.Drawing.Image.FromStream(newSystem.IO.MemoryStream(FileUpload.FileBytes));17 //if (GetPicThumbnail(image, FilePath + imagess, img1.Height, img1.Width, 100))18 //{19 //return true;20 //}21 //else22 //{23 //return false;24 //}

25 if (MakeThumbnail(image, Server.MapPath(FilePath + imagess), img1.Width, img1.Height, "Cut", "JPG"))26 {27 return true;28 }29 else

30 {31 return false;32 }33 //FileUpload.SaveAs(Server.MapPath("UiMain\\Employment\\images\\" + imagess));

34

35 }36 else

37 {38 Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "");39 return false;40 }41 }42 catch(Exception ex)43 {44 Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "");45 return false;46 }47 }48 else

49 {50 Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "");51 return false;52 }53 }54 else

55 {56 return false;57 }58 }59

60

61 ///

62 ///压缩图片并存储63 ///

64 /// 源图路径(物理路径)

65 /// 压缩面存储路径(物理路径)

66 /// 压缩图宽度

67 /// 压缩图高度

68 /// 生成压缩图的方式

69 /// 保存压缩图类型

70 public static bool MakeThumbnail(System.Drawing.Image originalImagePath, string thumbnailPath, int width, int height, string mode, stringtype)71 {72 //System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);

73 System.Drawing.Image originalImage = originalImagePath;//System.Drawing.Image.FromFile(originalImagePath);

74 bool isture = true; ;75 int towidth =width;76 int toheight =height;77 int x = 0;78 int y = 0;79 int ow =originalImage.Width;80 int oh =originalImage.Height;81 switch(mode)82 {83 case "HW"://指定高宽缩放(可能变形)

84 break;85 case "W"://指定宽，高按比例

86 toheight = originalImage.Height * width /originalImage.Width;87 break;88 case "H"://指定高，宽按比例

89 towidth = originalImage.Width * height /originalImage.Height;90 break;91 case "Cut"://指定高宽裁减(不变形)

92 if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)93 {94 oh =originalImage.Height;95 ow = originalImage.Height * towidth /toheight;96 y = 0;97 x = (originalImage.Width - ow) / 2;98 }99 else

100 {101 ow =originalImage.Width;102 oh = originalImage.Width * height /towidth;103 x = 0;104 y = (originalImage.Height - oh) / 2;105 }106 break;107 case "DB"://等比缩放(不变形，如果高大按高，宽大按宽缩放)

108 if ((double)originalImage.Width / (double)towidth < (double)originalImage.Height / (double)toheight)109 {110 toheight =height;111 towidth = originalImage.Width * height /originalImage.Height;112 }113 else

114 {115 towidth =width;116 toheight = originalImage.Height * width /originalImage.Width;117 }118 break;119 default:120 break;121 }122 //新建一个bmp图片

123 System.Drawing.Image bitmap = newSystem.Drawing.Bitmap(towidth, toheight);124 //新建一个画板

125 System.Drawing.Graphics g =System.Drawing.Graphics.FromImage(bitmap);126 //设置高质量插值法

127 g.InterpolationMode =System.Drawing.Drawing2D.InterpolationMode.High;128 //设置高质量,低速度呈现平滑程度

129 g.SmoothingMode =System.Drawing.Drawing2D.SmoothingMode.HighQuality;130 //清空画布并以透明背景色填充

131 g.Clear(System.Drawing.Color.Transparent);132 //在指定位置并且按指定大小绘制原图片的指定部分

133 g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),134 newSystem.Drawing.Rectangle(x, y, ow, oh),135 System.Drawing.GraphicsUnit.Pixel);136 try

137 {138 //保存缩略图

139 if (type == "JPG")140 {141 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);142 }143 if (type == "BMP")144 {145 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Bmp);146 }147 if (type == "GIF")148 {149 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Gif);150 }151 if (type == "PNG")152 {153 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Png);154 }155 }156 catch(System.Exception e)157 {158 isture = false;159 }160 finally

161 {162 originalImage.Dispose();163 bitmap.Dispose();164 g.Dispose();165 }166 returnisture;167 }168

169

170 ///

171 ///无损压缩图片172 ///

173 /// 原图片

174 /// 压缩后保存位置

175 /// 高度

176 ///

177 /// 压缩质量 1-100

178 ///

179 public bool GetPicThumbnail(System.Drawing.Image Image, string dFile, int dHeight, int dWidth, intflag)180 {181 System.Drawing.Image iSource =Image;182 ImageFormat tFormat =iSource.RawFormat;183 int sW = 0, sH = 0;184 //按比例缩放

185 Size tem_size = newSize(iSource.Width, iSource.Height);186 if (tem_size.Width > dHeight || tem_size.Width > dWidth) //将**改成c#中的或者操作符号

187 {188 if ((tem_size.Width * dHeight) > (tem_size.Height *dWidth))189 {190 sW =dWidth;191 sH = (dWidth * tem_size.Height) /tem_size.Width;192 }193 else

194 {195 sH =dHeight;196 sW = (tem_size.Width * dHeight) /tem_size.Height;197 }198 }199 else

200 {201 sW =tem_size.Width;202 sH =tem_size.Height;203 }204 Bitmap ob = newBitmap(dWidth, dHeight);205 Graphics g =Graphics.FromImage(ob);206 g.Clear(Color.WhiteSmoke);207 g.CompositingQuality =CompositingQuality.HighQuality;208 g.SmoothingMode =SmoothingMode.HighQuality;209 g.InterpolationMode =InterpolationMode.HighQualityBicubic;210 g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);211 g.Dispose();212 //以下代码为保存图片时，设置压缩质量

213 EncoderParameters ep = newEncoderParameters();214 long[] qy = new long[1];215 qy[0] = flag;//设置压缩的比例1-100

216 EncoderParameter eParam = newEncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);217 ep.Param[0] =eParam;218 try

219 {220 ImageCodecInfo[] arrayICI =ImageCodecInfo.GetImageEncoders();221 ImageCodecInfo jpegICIinfo = null;222 for (int x = 0; x < arrayICI.Length; x++)223 {224 if (arrayICI[x].FormatDescription.Equals("JPEG"))225 {226 jpegICIinfo =arrayICI[x];227 break;228 }229 }230 if (jpegICIinfo != null)231 {232 ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径

233 }234 else

235 {236 ob.Save(dFile, tFormat);237 }238 return true;239 }240 catch(Exception ex)241 {242 return false;243 }244 finally

245 {246 iSource.Dispose();247 ob.Dispose();248 }249 }