闲来无事,写个自动缩放照片的小程序
第一版(保存Exif)
参考:http://blog.csdn.net/ki1381/article/details/6369058
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.IO; using System.Drawing.Imaging; using System.Drawing; namespace MyPhotoProcess { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { string fileURL = txtFile.Text.Trim(); ProcessFile(fileURL); } public static void ProcessFile(string dir) { foreach (string d in Directory.GetFileSystemEntries(dir)) { if (File.Exists(d)) { FileInfo fi = new FileInfo(d); if (fi.Attributes.ToString().IndexOf("ReadOnly") != -1) fi.Attributes = FileAttributes.Normal; // 获取照片的Exif信息 var exif = GetImageProperties(d); MakeThumbnail(d, "D:/test/process/" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg", 150, 150, "EQU", exif); //File.Delete(d);//直接删除其中的文件 } else { DirectoryInfo d1 = new DirectoryInfo(d); if (d1.GetFiles().Length != 0) { ProcessFile(d1.FullName);//递归删除子文件夹 } //Directory.Delete(d); } } } #region 图片缩放,多种指定方式生成图片 /// <summary> /// 图片缩放 /// </summary> /// <param name="originalImagePath">原始图片路径,如:c:\\images\\1.gif</param> /// <param name="thumbnailPath">生成缩略图图片路径,如:c:\\images\\2.gif</param> /// <param name="width">宽</param> /// <param name="height">高</param> /// <param name="mode">EQU:指定最大高宽等比例缩放;HW://指定高宽缩放(可能变形);W:指定宽,高按比例;H:指定高,宽按比例;Cut:指定高宽裁减(不变形)</param> public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode, List<PropertyItem> exif) { 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; if (mode == "EQU")//指定最大高宽,等比例缩放 { //if(height/oh>width/ow),如果高比例多,按照宽来缩放;如果宽的比例多,按照高来缩放 if (height * ow > width * oh) { mode = "W"; } else { mode = "H"; } } 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 System.Drawing.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(System.Drawing.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 System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel); try { // 设置EXIF foreach (PropertyItem pitem in exif) { bitmap.SetPropertyItem(pitem); } //以jpg格式保存缩略图 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (System.Exception e) { throw e; } finally { originalImage.Dispose(); bitmap.Dispose(); g.Dispose(); } } #endregion /// <summary> /// 获取照片的Exif属性,存储成二进制list /// </summary> /// <param name="FileName"></param> /// <returns></returns> public static List<PropertyItem> GetImageProperties(string FileName) { if (!File.Exists(FileName)) return null; List<PropertyItem> rtn = new List<PropertyItem>(); System.Drawing.Image img = null; try { img = System.Drawing.Image.FromFile(FileName); PropertyItem[] pt = img.PropertyItems; foreach (PropertyItem p in pt) { rtn.Add(p); } } catch { rtn = null; } finally { if (img != null) img.Dispose(); } return rtn; } } }