.net验证码源码

<%@ Page language="c#" %>
<%@ Import Namespace="Seaskyer.Strings" %>
<%@ Import Namespace="Seaskyer.WebApp.Utility" %>
<% WebGDI.MakeSpamImageGen( "SignCode", Function.Str.RandomNUM(5) );%>

 

生成验证码类：

// Type: Seaskyer.WebApp.Utility.WebGDI
// Assembly: Seaskyer.WebApp.Utility, Version=1.2.10.14947, Culture=neutral, PublicKeyToken=c12b5a19434f2d93
// Assembly location: C:\Users\Administrator\Downloads\1ccfff8f01f0\skyNews12\海天人.Net新闻系统(skyNews) v1.2\bin\Seaskyer.WebApp.Utility.dll

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Web;

namespace Seaskyer.WebApp.Utility
{
  /// <summary>
  /// WebGDI : 文字图片、水印图片。
  /// 
  /// </summary>
  public class WebGDI
  {
    /// <summary>
    /// 生成缩微图，并加上阴影文字
    /// 
    /// </summary>
    /// <param name="Width">生成缩微图的宽度</param><param name="Height">生成缩微图的高度</param><param name="SourceImg"/><param name="Text"/><param name="Left"/><param name="Top"/><param name="font">new Font("Fixedsys", 9, FontStyle.Regular)</param>
    public static void GetThumbnailImage(int Width, int Height, string SourceImg, string Text, int Left, int Top, Font font)
    {
      string filename = SourceImg + ".jpg";
      Image image = Image.FromFile(SourceImg);
      Image thumbnailImage = image.GetThumbnailImage(Width, Height, new Image.GetThumbnailImageAbort(WebGDI.ThumbnailCallback), IntPtr.Zero);
      HttpContext.Current.Response.Clear();
      Bitmap bitmap = new Bitmap(thumbnailImage);
      Graphics graphics = Graphics.FromImage((Image) bitmap);
      graphics.DrawString(Text, font, (Brush) new SolidBrush(Color.Black), (float) (Left - 1), (float) (Top + 2), new StringFormat(StringFormatFlags.DirectionVertical));
      graphics.DrawString(Text, font, (Brush) new SolidBrush(Color.White), (float) Left, (float) Top, new StringFormat(StringFormatFlags.DirectionVertical));
      bitmap.Save(filename, ImageFormat.Jpeg);
      thumbnailImage.Dispose();
      image.Dispose();
      bitmap.Dispose();
      graphics.Dispose();
    }

    private static bool ThumbnailCallback()
    {
      return true;
    }

    /// <summary>
    /// 在一张图片的指定位置处加入水印文字
    /// 
    /// </summary>
    /// <param name="SourceImage">指定源图片的绝对路径</param><param name="Text">指定文本</param><param name="fontFamily">文本字体</param><param name="textPos">指定位置</param><param name="SaveImage">保存图片的绝对路径</param>
    public static void GetWaterMarkTextImage(string SourceImage, string Text, string fontFamily, wmPosition textPos, string SaveImage)
    {
      Image image1 = Image.FromFile(SourceImage);
      int width = image1.Width;
      int height = image1.Height;
      Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format24bppRgb);
      bitmap.SetResolution(image1.HorizontalResolution, image1.VerticalResolution);
      Graphics graphics = Graphics.FromImage((Image) bitmap);
      graphics.SmoothingMode = SmoothingMode.AntiAlias;
      graphics.DrawImage(image1, new Rectangle(0, 0, width, height), 0, 0, width, height, GraphicsUnit.Pixel);
      int[] numArray = new int[7]
      {
        16,
        14,
        12,
        10,
        8,
        6,
        4
      };
      Font font = (Font) null;
      SizeF sizeF = new SizeF();
      for (int index = 0; index < 7; ++index)
      {
        font = new Font(fontFamily, (float) numArray[index], FontStyle.Bold);
        sizeF = graphics.MeasureString(Text, font);
        if ((int) (ushort) sizeF.Width < (int) (ushort) width)
          break;
      }
      int num = (int) ((double) height * 0.05);
      float y = (float) (height - num) - sizeF.Height / 2f;
      float x = (float) (width / 2);
      StringFormat format = new StringFormat();
      format.Alignment = StringAlignment.Center;
      SolidBrush solidBrush1 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
      graphics.DrawString(Text, font, (Brush) solidBrush1, new PointF(x + 1f, y + 1f), format);
      SolidBrush solidBrush2 = new SolidBrush(Color.FromArgb(153, (int) byte.MaxValue, (int) byte.MaxValue, (int) byte.MaxValue));
      graphics.DrawString(Text, font, (Brush) solidBrush2, new PointF(x, y), format);
      graphics.Dispose();
      image1.Dispose();
      Image image2 = (Image) bitmap;
      image2.Save(SaveImage, ImageFormat.Jpeg);
      bitmap.Dispose();
      image2.Dispose();
    }

    /// <summary>
    /// 在一张图片的指定位置处加入一张具有水印效果的图片
    /// 
    /// </summary>
    /// <param name="SourceImage">指定源图片的绝对路径</param><param name="WaterMarkImage">指定水印图片的绝对路径</param><param name="wmPos">指定位置</param><param name="SaveImage">保存图片的绝对路径</param>
    public static void GetWaterMarkPicImage(string SourceImage, string WaterMarkImage, wmPosition wmPos, string SaveImage)
    {
      Image image1 = Image.FromFile(SourceImage);
      int width1 = image1.Width;
      int height1 = image1.Height;
      Bitmap bitmap1 = new Bitmap(width1, height1, PixelFormat.Format24bppRgb);
      bitmap1.SetResolution(image1.HorizontalResolution, image1.VerticalResolution);
      Graphics graphics1 = Graphics.FromImage((Image) bitmap1);
      graphics1.SmoothingMode = SmoothingMode.AntiAlias;
      graphics1.DrawImage(image1, new Rectangle(0, 0, width1, height1), 0, 0, width1, height1, GraphicsUnit.Pixel);
      Image image2 = (Image) new Bitmap(WaterMarkImage);
      int width2 = image2.Width;
      int height2 = image2.Height;
      Bitmap bitmap2 = new Bitmap((Image) bitmap1);
      bitmap2.SetResolution(image1.HorizontalResolution, image1.VerticalResolution);
      Graphics graphics2 = Graphics.FromImage((Image) bitmap2);
      ImageAttributes imageAttr = new ImageAttributes();
      ColorMap[] map = new ColorMap[1]
      {
        new ColorMap()
        {
          OldColor = Color.FromArgb((int) byte.MaxValue, 0, (int) byte.MaxValue, 0),
          NewColor = Color.FromArgb(0, 0, 0, 0)
        }
      };
      imageAttr.SetRemapTable(map, ColorAdjustType.Bitmap);
      float[][] newColorMatrix1 = new float[5][];
      float[][] numArray1 = newColorMatrix1;
      int index1 = 0;
      float[] numArray2 = new float[5];
      numArray2[0] = 1f;
      float[] numArray3 = numArray2;
      numArray1[index1] = numArray3;
      float[][] numArray4 = newColorMatrix1;
      int index2 = 1;
      float[] numArray5 = new float[5];
      numArray5[1] = 1f;
      float[] numArray6 = numArray5;
      numArray4[index2] = numArray6;
      float[][] numArray7 = newColorMatrix1;
      int index3 = 2;
      float[] numArray8 = new float[5];
      numArray8[2] = 1f;
      float[] numArray9 = numArray8;
      numArray7[index3] = numArray9;
      float[][] numArray10 = newColorMatrix1;
      int index4 = 3;
      float[] numArray11 = new float[5];
      numArray11[3] = 0.3f;
      float[] numArray12 = numArray11;
      numArray10[index4] = numArray12;
      float[][] numArray13 = newColorMatrix1;
      int index5 = 4;
      float[] numArray14 = new float[5];
      numArray14[4] = 1f;
      float[] numArray15 = numArray14;
      numArray13[index5] = numArray15;
      ColorMatrix newColorMatrix2 = new ColorMatrix(newColorMatrix1);
      imageAttr.SetColorMatrix(newColorMatrix2, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
      int x = width1 - width2 - 10;
      int y = 10;
      graphics2.DrawImage(image2, new Rectangle(x, y, width2, height2), 0, 0, width2, height2, GraphicsUnit.Pixel, imageAttr);
      image1.Dispose();
      Image image3 = (Image) bitmap2;
      graphics1.Dispose();
      graphics2.Dispose();
      bitmap1.Dispose();
      image3.Save(SaveImage, ImageFormat.Jpeg);
      image3.Dispose();
      image2.Dispose();
      bitmap2.Dispose();
    }

    /// <summary>
    /// 在一张图片的指定位置处加入一张具有水印效果的图片和一段文本
    /// 
    /// </summary>
    /// <param name="SourceImage"/><param name="WaterMarkImage"/><param name="Text"/><param name="fontFamily"/><param name="wmPos"/><param name="textPos"/><param name="SaveImage"/>
    public static void GetWarterMarkPicTextImage(string SourceImage, string WaterMarkImage, string Text, string fontFamily, wmPosition wmPos, wmPosition textPos, string SaveImage)
    {
      Image image1 = Image.FromFile(SourceImage);
      int width1 = image1.Width;
      int height1 = image1.Height;
      Bitmap bitmap1 = new Bitmap(width1, height1, PixelFormat.Format24bppRgb);
      bitmap1.SetResolution(image1.HorizontalResolution, image1.VerticalResolution);
      Graphics graphics1 = Graphics.FromImage((Image) bitmap1);
      graphics1.SmoothingMode = SmoothingMode.AntiAlias;
      graphics1.DrawImage(image1, new Rectangle(0, 0, width1, height1), 0, 0, width1, height1, GraphicsUnit.Pixel);
      int[] numArray1 = new int[7]
      {
        16,
        14,
        12,
        10,
        8,
        6,
        4
      };
      Font font = (Font) null;
      SizeF sizeF = new SizeF();
      for (int index = 0; index < 7; ++index)
      {
        font = new Font(fontFamily, (float) numArray1[index], FontStyle.Bold);
        sizeF = graphics1.MeasureString(Text, font);
        if ((int) (ushort) sizeF.Width < (int) (ushort) width1)
          break;
      }
      int num = (int) ((double) height1 * 0.05);
      float y1 = (float) (height1 - num) - sizeF.Height / 2f;
      float x1 = (float) (width1 / 2);
      StringFormat format = new StringFormat();
      format.Alignment = StringAlignment.Center;
      SolidBrush solidBrush1 = new SolidBrush(Color.FromArgb(100, 0, 0, 0));
      graphics1.DrawString(Text, font, (Brush) solidBrush1, new PointF(x1 + 1f, y1 + 1f), format);
      SolidBrush solidBrush2 = new SolidBrush(Color.FromArgb(100, (int) byte.MaxValue, (int) byte.MaxValue, (int) byte.MaxValue));
      graphics1.DrawString(Text, font, (Brush) solidBrush2, new PointF(x1, y1), format);
      Image image2 = (Image) new Bitmap(WaterMarkImage);
      int width2 = image2.Width;
      int height2 = image2.Height;
      Bitmap bitmap2 = new Bitmap((Image) bitmap1);
      bitmap2.SetResolution(image1.HorizontalResolution, image1.VerticalResolution);
      Graphics graphics2 = Graphics.FromImage((Image) bitmap2);
      ImageAttributes imageAttr = new ImageAttributes();
      ColorMap[] map = new ColorMap[1]
      {
        new ColorMap()
        {
          OldColor = Color.FromArgb((int) byte.MaxValue, 0, (int) byte.MaxValue, 0),
          NewColor = Color.FromArgb(0, 0, 0, 0)
        }
      };
      imageAttr.SetRemapTable(map, ColorAdjustType.Bitmap);
      float[][] newColorMatrix1 = new float[5][];
      float[][] numArray2 = newColorMatrix1;
      int index1 = 0;
      float[] numArray3 = new float[5];
      numArray3[0] = 1f;
      float[] numArray4 = numArray3;
      numArray2[index1] = numArray4;
      float[][] numArray5 = newColorMatrix1;
      int index2 = 1;
      float[] numArray6 = new float[5];
      numArray6[1] = 1f;
      float[] numArray7 = numArray6;
      numArray5[index2] = numArray7;
      float[][] numArray8 = newColorMatrix1;
      int index3 = 2;
      float[] numArray9 = new float[5];
      numArray9[2] = 1f;
      float[] numArray10 = numArray9;
      numArray8[index3] = numArray10;
      float[][] numArray11 = newColorMatrix1;
      int index4 = 3;
      float[] numArray12 = new float[5];
      numArray12[3] = 0.3f;
      float[] numArray13 = numArray12;
      numArray11[index4] = numArray13;
      float[][] numArray14 = newColorMatrix1;
      int index5 = 4;
      float[] numArray15 = new float[5];
      numArray15[4] = 1f;
      float[] numArray16 = numArray15;
      numArray14[index5] = numArray16;
      ColorMatrix newColorMatrix2 = new ColorMatrix(newColorMatrix1);
      imageAttr.SetColorMatrix(newColorMatrix2, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
      int x2 = width1 - width2 - 10;
      int y2 = 10;
      graphics2.DrawImage(image2, new Rectangle(x2, y2, width2, height2), 0, 0, width2, height2, GraphicsUnit.Pixel, imageAttr);
      image1.Dispose();
      Image image3 = (Image) bitmap2;
      graphics1.Dispose();
      graphics2.Dispose();
      bitmap1.Dispose();
      image3.Save(SaveImage, ImageFormat.Jpeg);
      image3.Dispose();
      image2.Dispose();
      bitmap2.Dispose();
    }

    /// <summary>
    /// 生成验证码图片
    /// 
    /// </summary>
    /// <param name="sessionName"/><param name="str"/>
    public static void MakeSpamImageGen(string sessionName, string str)
    {
      HttpContext current = HttpContext.Current;
      int num1 = 5;
      int num2 = 12;
      int width = 60;
      int height = 20;
      float num3 = (float) (((double) width - (double) num1 * ((double) num2 + 0.5)) / 2.0);
      float y = (float) (((double) height - (double) num2 * 1.70000004768372) / 2.0);
      if (num2 == -1)
        num2 = 30;
      if (width == -1)
        width = 290;
      if (height == -1)
        height = 80;
      string str1 = str;
      current.Session.Add(sessionName, (object) str1);
      Bitmap bitmap = new Bitmap(Image.FromFile(current.Server.MapPath(string.Concat(new object[4]
      {
        (object) current.Request.ApplicationPath,
        (object) "/Images/AntiSpamBgImgs/bg_",
        (object) new Random().Next(5),
        (object) ".jpg"
      }))), width, height);
      Graphics graphics = Graphics.FromImage((Image) bitmap);
      SolidBrush solidBrush = new SolidBrush(Color.Black);
      string[] strArray = new string[10]
      {
        "Arial",
        "Verdana",
        "Fixedsys",
        "宋体",
        "Haettenschweiler",
        "Lucida Sans Unicode",
        "Garamond",
        "Courier New",
        "Book Antiqua",
        "Arial Narrow"
      };
      for (int index = 0; index < str1.Length; ++index)
      {
        Font font = new Font(strArray[new Random().Next(index)], (float) num2, FontStyle.Bold);
        graphics.DrawString(str1.Substring(index, 1), font, (Brush) solidBrush, num3 + (float) (index * num2), y);
        graphics.Flush();
      }
      graphics.Flush();
      graphics.Dispose();
      current.Response.ContentType = "image/gif";
      bitmap.Save(current.Response.OutputStream, ImageFormat.Gif);
      current.Response.Flush();
      current.Response.End();
    }

    /// <summary>
    /// 检测指定图片是否符合标准
    /// 
    /// </summary>
    /// <param name="imgLoc"/><param name="width"/><param name="height"/>
    /// <returns/>
    public static bool JustImage(string imgLoc, int width, int height)
    {
      Image image = Image.FromFile(imgLoc);
      int width1 = image.Width;
      int height1 = image.Height;
      return width1 >= width && height1 >= height;
    }

    /// <summary/>
    /// <param name="imgLoc"/><param name="wmLoc"/>
    public static void ImageMark(string imgLoc, string wmLoc)
    {
      WebGDI.ImageMark(imgLoc, wmLoc, "RB");
    }

    /// <summary/>
    /// <param name="imgLoc"/><param name="wmLoc"/><param name="wmAlign"/>
    public static void ImageMark(string imgLoc, string wmLoc, string wmAlign)
    {
      if (imgLoc.Substring(imgLoc.Length - 3, 3).ToLower() != "jpg")
        return;
      Image original = Image.FromFile(imgLoc);
      int width1 = original.Width;
      int height1 = original.Height;
      Bitmap bitmap1 = new Bitmap(original, width1, height1);
      bitmap1.SetResolution(72f, 72f);
      Graphics graphics1 = Graphics.FromImage((Image) bitmap1);
      Image image1 = (Image) new Bitmap(wmLoc);
      int width2 = image1.Width;
      int height2 = image1.Height;
      if (width1 < width2 || height1 < height2 * 2)
        return;
      Bitmap bitmap2 = new Bitmap((Image) bitmap1);
      bitmap2.SetResolution(original.HorizontalResolution, original.VerticalResolution);
      Graphics graphics2 = Graphics.FromImage((Image) bitmap2);
      ImageAttributes imageAttr = new ImageAttributes();
      ColorMap[] map = new ColorMap[1]
      {
        new ColorMap()
        {
          OldColor = Color.FromArgb(0, 0, (int) byte.MaxValue, 0),
          NewColor = Color.FromArgb(0, 0, 0, 0)
        }
      };
      imageAttr.SetRemapTable(map, ColorAdjustType.Bitmap);
      float[][] newColorMatrix1 = new float[5][];
      float[] numArray1 = new float[5];
      numArray1[0] = 1f;
      newColorMatrix1[0] = numArray1;
      float[] numArray2 = new float[5];
      numArray2[1] = 1f;
      newColorMatrix1[1] = numArray2;
      float[] numArray3 = new float[5];
      numArray3[2] = 1f;
      newColorMatrix1[2] = numArray3;
      float[] numArray4 = new float[5];
      numArray4[3] = 0.8f;
      newColorMatrix1[3] = numArray4;
      float[] numArray5 = new float[5];
      numArray5[4] = 1f;
      newColorMatrix1[4] = numArray5;
      ColorMatrix newColorMatrix2 = new ColorMatrix(newColorMatrix1);
      imageAttr.SetColorMatrix(newColorMatrix2, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
      int x;
      int y;
      if (wmAlign == "LT")
      {
        x = 0;
        y = 0;
      }
      else if (wmAlign == "LB")
      {
        x = 0;
        y = height1 - height2;
      }
      else if (wmAlign == "RT")
      {
        x = width1 - width2;
        y = 0;
      }
      else if (wmAlign == "CT")
      {
        x = (width1 - width2) / 2;
        y = (height1 - height2) / 2;
      }
      else
      {
        x = width1 - width2;
        y = height1 - height2;
      }
      graphics2.DrawImage(image1, new Rectangle(x, y, width2, height2), 0, 0, width2, height2, GraphicsUnit.Pixel, imageAttr);
      original.Dispose();
      Image image2 = (Image) bitmap2;
      graphics1.Dispose();
      graphics2.Dispose();
      bitmap1.Dispose();
      ImageCodecInfo encoderInfo = WebGDI.GetEncoderInfo("image/jpeg");
      EncoderParameter encoderParameter = new EncoderParameter(Encoder.Quality, 90L);
      EncoderParameters encoderParams = new EncoderParameters(1);
      encoderParams.Param[0] = encoderParameter;
      image2.Save(imgLoc, encoderInfo, encoderParams);
      image2.Dispose();
      image1.Dispose();
    }

    /// <summary/>
    /// <param name="mimeType"/>
    /// <returns/>
    private static ImageCodecInfo GetEncoderInfo(string mimeType)
    {
      ImageCodecInfo[] imageEncoders = ImageCodecInfo.GetImageEncoders();
      for (int index = 0; index < imageEncoders.Length; ++index)
      {
        if (imageEncoders[index].MimeType == mimeType)
          return imageEncoders[index];
      }
      return (ImageCodecInfo) null;
    }
  }
}

 

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