net 生成gif动画验证码

.net 生成gif动画验证码using System;using System.IO;using System.Web;using System.Drawing;//GIF验证码类public class Validate{//设置最少4位验证码private byte TrueValidateCodeCount = 4;public byte ValidateCodeCount{get { return TrueValidateCodeCount; }set{//验证码至少为3位if (value > 4)TrueValidateCodeCount = value;}}protected string ValidateCode = "";//是否消除锯齿public bool FontTextRenderingHint = false;//验证码字体public string ValidateCodeFont = "Arial";//验证码型号(像素)public float ValidateCodeSize = 13;public int ImageHeight = 23;//定义验证码中所有的字符public string AllChar = "1,2,3,4,5,6,7,8,9,0,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";//获得随机四位数private void CreateValidate(){ValidateCode = "";//将验证码中所有的字符保存在一个字符串数组中string[] CharArray = AllChar.Split(',');int Temp = -1;//生成一个随机对象Random RandCode = new Random();//根据验证码的位数循环for (int i = 0; i < ValidateCodeCount; i++){//主要是防止生成相同的验证码if (Temp != -1){//加入时间的刻度RandCode = new Random(i * Temp * ((int)DateTime.Now.Ticks));}int t = RandCode.Next(35);if (Temp == t){//相等的话重新生成CreateValidate();}Temp = t;ValidateCode += CharArray[Temp];}//错误检测,去除超过指定位数的验证码if (ValidateCode.Length > TrueValidateCodeCount)ValidateCode = ValidateCode.Remove(TrueValidateCodeCount);}//生成一帧的BMP图象private void CreateImageBmp(out Bitmap ImageFrame){//获得验证码字符char[] CodeCharArray = ValidateCode.ToCharArray(0, ValidateCodeCount);//图像的宽度-与验证码的长度成一定比例int ImageWidth = (int)(TrueValidateCodeCount * ValidateCodeSize * 1.3 + 4);//创建一个长20，宽iwidth的图像对象ImageFrame = new Bitmap(ImageWidth, ImageHeight);//创建一个新绘图对象Graphics ImageGraphics = Graphics.FromImage(ImageFrame);//清除背景色，并填充背景色//Note:Color.Transparent为透明ImageGraphics.Clear(Color.White);//绘图用的字体和字号Font CodeFont = new Font(ValidateCodeFont, ValidateCodeSize, FontStyle.Bold);//绘图用的刷子大小Brush ImageBrush = new SolidBrush(Color.Red);//字体高度计算int FontHeight = (int)Math.Max(ImageHeight - ValidateCodeSize - 3, 2);//创建随机对象Random rand = new Random();//开始随机安排字符的位置，并画到图像里for (int i = 0; i < TrueValidateCodeCount; i++){//生成随机点，决定字符串的开始输出范围int[] FontCoordinate = new int[2];FontCoordinate[0] = (int)(i * ValidateCodeSize + rand.Next(1)) + 3;FontCoordinate[1] = rand.Next(FontHeight);Point FontDrawPoint = new Point(FontCoordinate[0], FontCoordinate[1]);//消除锯齿操作if (FontTextRenderingHint)ImageGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixel;elseImageGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;//格式化刷子属性-用指定的刷子、颜色等在指定的范围内画图ImageGraphics.DrawString(CodeCharArray[i].ToString(), CodeFont, ImageBrush, FontDrawPoint);}ImageGraphics.Dispose();}//处理生成的BMPprivate void DisposeImageBmp(ref Bitmap ImageFrame){//创建绘图对象Graphics ImageGraphics = Graphics.FromImage(ImageFrame);//创建铅笔对象Pen ImagePen = new Pen(Color.Red, 1);//创建随机对象Random rand = new Random();//创建随机点Point[] RandPoint = new Point[2];//随机画线for (int i = 0; i < 15; i++){RandPoint[0] = new Point(rand.Next(ImageFrame.Width), rand.Next(ImageFrame.Height));RandPoint[1] = new Point(rand.Next(ImageFrame.Width), rand.Next(ImageFrame.Height));ImageGraphics.DrawLine(ImagePen, RandPoint[0], RandPoint[1]);}ImageGraphics.Dispose();}//创建GIF动画private void CreateImageGif(){Bitmap ImageFrame;Kissogram.Drawing.Gif.AnimatedGifEncoder GifPic = new Kissogram.Drawing.Gif.AnimatedGifEncoder();MemoryStream BmpMemory = new MemoryStream();GifPic.Start();//确保视觉残留GifPic.SetDelay(5);//-1:no repeat,0:always repeatGifPic.SetRepeat(0);for (int i = 0; i < 20; i++){//创建一帧的图像CreateImageBmp(out ImageFrame);//生成随机线条DisposeImageBmp(ref ImageFrame);//输出绘图,将图像保存到指定的流ImageFrame.Save(BmpMemory,System.Drawing.Imaging.ImageFormat.Png);GifPic.AddFrame(Image.FromStream(BmpMemory));BmpMemory = new MemoryStream();}GifPic.OutPut(ref BmpMemory);HttpContext.Current.Response.ClearContent();//配置输出类型HttpContext.Current.Response.ContentType = "image/Gif";//输出内容HttpContext.Current.Response.BinaryWrite(BmpMemory.ToArray());BmpMemory.Close();BmpMemory.Dispose();}//输出验证码public void OutPutValidate(string ValidateCodeSession){CreateValidate();CreateImageGif();//把生成的验证码输入到SESSIONHttpContext.Current.Session[ValidateCodeSession] = ValidateCode;}}加水印的代码：public static Bitmap WaterMarkWithText(System.Drawing.Bitmap origialGif, string text,string filePath){//用于存放桢List frames = new List();//如果不是gif文件,直接返回原图像if (origialGif.RawFormat.Guid != System.Drawing.Imaging.ImageFormat.Gif.Guid){return origialGif;}//如果该图像是gif文件foreach (Guid guid in origialGif.FrameDimensionsList){System.Drawing.Imaging.FrameDimension frameDimension = new System.Drawing.Imaging.FrameDimension(guid);int frameCount = origialGif.GetFrameCount(frameDimension);for (int i = 0; i < frameCount; i++){if (origialGif.SelectActiveFrame(frameDimension, i) == 0){int delay = Convert.ToInt32(origialGif.GetPropertyItem(20736).Value.GetValue(i));Image img = Image.FromHbitmap(origialGif.GetHbitmap());Font font = new Font(new FontFamily("宋体"), 35.0f,FontStyle.Bold);Graphics g = Graphics.FromImage(img);g.DrawString(text, font, Brushes.BlanchedAlmond, new PointF(10.0f, 10.0f));Frame frame = new Frame(img, delay);frames.Add(frame);}}ponents.AnimatedGifEncoder gif = new ponents.AnimatedGifEncoder();gif.Start(filePath);gif.SetDelay(100);gif.SetRepeat(0);for (int i = 0; i < frames.Count; i++){gif.AddFrame(frames[i].Image);}gif.Finish();try{Bitmap gifImg = (Bitmap)Bitmap.FromFile(filePath);return gifImg;}catch{return origialGif;}}return origialGif;}Bitmap bmp = new Bitmap(100, 100);Graphics g = Graphics.FromImage(bmp);Font f = new Font("arial", 11f);Brush b = Brushes.Blue;string txt = "Rotate text animation!";SizeF sz = g.MeasureString(txt, f);g.Clear(Color.WhiteSmoke);g.DrawString(txt, f, b, 50-sz.Width/2, 50-sz.Height/2);g.Flush();GifImage.GifAnimation gif = new GifImage.GifAnimation(bmp,GifImage.GraphicControlExt.Default);gif.Application = GifImage.ApplicationExt.Default;eGlobalColorTableOnly = true;for (int i = 1; i < 36; ++i){g.Clear(Color.WhiteSmoke);g.TranslateTransform(50,50);g.RotateTransform(10f * i);g.DrawString(txt, f, b, sz.Width/-2, sz.Height/-2);g.ResetTransform();g.DrawString("Hello", f, Brushes.Red, -50 + i * 4, 20);g.DrawString("Yeah", f, Brushes.Orange, 60, -20+i*4);g.Flush();gif.AddFrame(bmp);}f.Dispose();g.Dispose();bmp.Dispose();FileStream fs = new FileStream(@"E:\vmlinux\out.gif", FileMode.Create); gif.Save(fs);fs.Close();Console.WriteLine("{0}x{1}", gif.Screen.Width, gif.Screen.Height);。