二进制图片格式转换
View Code 1 public static bool IsAllowedExtension(byte[] imgArray, FileExtension[] fileEx) 2 { 3 MemoryStream ms = new MemoryStream(imgArray); 4 System.IO.BinaryReader br = new System.IO.BinaryReader(ms); 5 string fileclass = ""; 6 byte buffer; 7 try 8 { 9 buffer = br.ReadByte();10 fileclass = buffer.ToString();11 buffer = br.ReadByte();12 fileclass += buffer.ToString();13 }14 catch15 {16 }17 br.Close();18 ms.Close();19 foreach (FileExtension fe in fileEx)20 {21 if (Int32.Parse(fileclass) == (int)fe)22 return true;23 }24 return false;25 }26 public enum FileExtension27 {28 JPG = 255216,29 GIF = 7173,30 PNG = 13780,31 SWF = 6787,32 RAR = 8297,33 ZIP = 8075,34 _7Z = 55122,35 XLS = 208207,36 XLSX = 8075,37 bmp = 667738 }39 40 调用41 //判断下是否为gif42 if (IsAllowedExtension(buffer, new FileExtension[] { FileExtension.GIF,FileExtension.PNG,FileExtension.bmp }))43 {44 using (MemoryStream newstream = new MemoryStream())45 {46 bitmap.Save(newstream, System.Drawing.Imaging.ImageFormat.Jpeg);47 //48 using (Bitmap newbitmap = new Bitmap(newstream, true))49 {50 }51 }52 }TAG:
