public class ImageHelper { public static string SaveImage(string base64String,string imageDir) { string picPath = ""; try { byte[] bytes = System.Convert.FromBase64String(base64String);//base64转为byte数组 MemoryStream ms = new MemoryStream(bytes);//创建内存流,将图片编码导入 Image image = Image.FromStream(ms); Random ran = new Random((int)DateTime.Now.Ticks); string fileName = DateTime.Now.ToString("yyyyMMddhhmmssms") + ran.Next() + ".jpeg"; //文件保存位置及命名,精确到毫秒并附带一组随机数,防止文件重名,数据库保存路径为此变量 string serverPath = imageDir + "\\" + fileName; string fullPath = (System.AppDomain.CurrentDomain.BaseDirectory + serverPath); ImageFormat imgfor = ImageFormat.Jpeg;//设置图片格式 image.Save(fullPath, imgfor); //保存图片 ms.Close(); ms.Dispose(); image.Dispose(); picPath = imageDir + "/" + fileName; } catch (Exception err) { } return picPath; } public static byte[] GetImageAsByteArray(string imageFilePath) { using (FileStream fileStream = new FileStream(imageFilePath, FileMode.Open, FileAccess.Read)) { using (BinaryReader binaryReader = new BinaryReader(fileStream)) { return binaryReader.ReadBytes((int)fileStream.Length); } } } public static string GetBase64String(byte[] data) { return Convert.ToBase64String(data); } /// <summary> /// 无损压缩图片 /// </summary> /// <param name="sFile">原图片地址</param> /// <param name="dFile">压缩后保存图片地址</param> /// <param name="flag">压缩质量(数字越小压缩率越高)1-100</param> /// <param name="size">压缩后图片的最大大小</param> /// <param name="sfsc">是否是第一次调用</param> /// <returns></returns> public static bool CompressImage(string sFile, string dFile, int flag = 97, int size = 500, bool sfsc = true) { //如果是第一次调用,原始图像的大小小于要压缩的大小,则直接复制文件,并且返回true FileInfo firstFileInfo = new FileInfo(sFile); if (sfsc == true && firstFileInfo.Length < size * 1024) { firstFileInfo.CopyTo(dFile); return true; } Image iSource = Image.FromFile(sFile); ImageFormat tFormat = iSource.RawFormat; int dHeight, dWidth; if(iSource.Height > 1500 || iSource.Width > 1500) { dHeight = iSource.Height * 2 / 3; dWidth = iSource.Width * 2 / 3; } else { dHeight = iSource.Height; dWidth = iSource.Width; } int sW = 0, sH = 0; //按比例缩放 Size tem_size = new Size(iSource.Width, iSource.Height); if (tem_size.Width > dHeight || tem_size.Width > dWidth) { if ((tem_size.Width * dHeight) > (tem_size.Width * dWidth)) { sW = dWidth; sH = (dWidth * tem_size.Height) / tem_size.Width; } else { sH = dHeight; sW = (tem_size.Width * dHeight) / tem_size.Height; } } else { sW = tem_size.Width; sH = tem_size.Height; } Bitmap ob = new Bitmap(dWidth, dHeight); Graphics g = Graphics.FromImage(ob); g.Clear(Color.WhiteSmoke); g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel); g.Dispose(); //以下代码为保存图片时,设置压缩质量 EncoderParameters ep = new EncoderParameters(); long[] qy = new long[1]; qy[0] = flag;//设置压缩的比例1-100 EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy); ep.Param[0] = eParam; try { ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders(); ImageCodecInfo jpegICIinfo = null; for (int x = 0; x < arrayICI.Length; x++) { if (arrayICI[x].FormatDescription.Equals("JPEG")) { jpegICIinfo = arrayICI[x]; break; } } if (jpegICIinfo != null) { ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径 FileInfo fi = new FileInfo(dFile); if (fi.Length > 1024 * size) { flag = flag - 10; CompressImage(sFile, dFile, flag, size, false); } } else { ob.Save(dFile, tFormat); } return true; } catch { return false; } finally { iSource.Dispose(); ob.Dispose(); } } /// <summary> /// 根据路径删除文件 /// </summary> /// <param name="path"></param> public static void DeleteFile(string path) { FileAttributes attr = File.GetAttributes(path); if (attr == FileAttributes.Directory) { Directory.Delete(path, true); } else { File.Delete(path); } } }
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