class Program
    {
        static double size = 2.443438914027149;
        static void Main(string[] args)
        {
            if (!System.IO.Directory.Exists("Img")){
                System.IO.Directory.CreateDirectory("Img");
                Console.WriteLine("已创建Img目录，请把需要处理的图片放到该目录下");
                Console.ReadKey(true);
                return;
            }
            if (!System.IO.Directory.Exists("NewImg")){
                System.IO.Directory.CreateDirectory("NewImg");
            }
            GetPath("Img");
            Console.ReadKey(true);
        }
        //读取文件夹中所有文件
        static public void GetPath(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;
                    }
                    ChangeImageSize(dir);
                    break;
                }else {
                    DirectoryInfo d1 = new DirectoryInfo(d);
                    GetPath(dir +"/" +d1.Name);
                }
            }
        }
        static public void ChangeImageSize(string dir) {
            string[] fileStrs = System.IO.Directory.GetFiles(dir);
            foreach (string s in fileStrs) {
                System.IO.FileInfo info = new System.IO.FileInfo(s);
                if (info.Extension == ".png" || info.Extension == ".jpg") {
                    Image img = GetFile(s);
                    Bitmap bit = GetNewSizeBitmap(img, size);
                    SaveImage(bit, info.Name, info.Extension,dir);
                }
            }
        }
        static public Image GetFile(string path)
        {
            FileStream stream = File.OpenRead(path);
            int fileLength = 0;
            fileLength = (int)stream.Length;
            Byte[] image = new Byte[fileLength];
            stream.Read(image, 0, fileLength);
            System.Drawing.Image result = System.Drawing.Image.FromStream(stream);
            stream.Close();
            return result;
        }
        static public Bitmap GetNewSizeBitmap(Image img , double size){
            int newWidth = Convert.ToInt32(img.Width / size);
            int newHeight = Convert.ToInt32(img.Height / size);
            Size s = new Size(newWidth, newHeight);
            Bitmap newBit = new Bitmap(img, s);
            return newBit;
        }
        static public void SaveImage(Bitmap bit, string name, string ext, string dir)
        {
            if (!System.IO.Directory.Exists("NewImg\\" + dir)) {
                System.IO.Directory.CreateDirectory("NewImg\\" + dir);
            }
            bit.Save(@"NewImg\\" + dir + "\\" + name);
            bit.Dispose();
            Console.WriteLine("已处理:" + name);
        }
    }