如何調用?

在一個單獨頁面調用：
??? protected void Page_Load(object sender, EventArgs e)
??? {

//獲取驗證碼的文字
????????String??sContent = authcode.CreateImageOnPage(this.Context);?? // 輸出圖片
??? }

類文件:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;

namespace HGZP.PLL
{
??? /// <summary>
??? /// 功能：驗證碼生成類
??? /// 作者：許金杰
??? /// 時間：2011.7.2
??? /// </summary>

??? public class authcode
??? {
??????? #region 驗證碼長度
??????? int length = 4;
??????? public int Length
??????? {
??????????? get { return length; }
??????????? set { length = value; }
??????? }
??????? #endregion
??????? #region 驗證碼字體大小(為了顯示扭曲效果，默認40像素，可以自行修改)
??????? int fontSize = 40;//簡介定義了圖片大小：80px 160px
??????? public int FontSize
??????? {
??????????? get { return fontSize; }
??????????? set { fontSize = value; }
??????? }
??????? #endregion
??????? #region 邊框補(默認1像素)
??????? int padding = 2;
??????? public int Padding
??????? {
??????????? get { return padding; }
??????????? set { padding = value; }
??????? }
??????? #endregion
??????? #region 是否輸出燥點
??????? bool chaos = true;
??????? public bool Chaos
??????? {
??????????? get { return chaos; }
??????????? set { chaos = value; }
??????? }
??????? #endregion
??????? #region 輸出燥點的顏色(默認灰色)
??????? Color chaosColor = Color.LightGray;
??????? public Color ChaosColor
??????? {
??????????? get { return chaosColor; }
??????????? set { chaosColor = value; }
??????? }
??????? #endregion
??????? #region 自定義背景色(默認白色)
??????? Color backgroundColor = Color.White;
??????? public Color BackgroundColor
??????? {
??????????? get { return backgroundColor; }
??????????? set { backgroundColor = value; }
??????? }
??????? #endregion
??????? #region 自定義隨機顏色數組
??????? Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
??????? public Color[] Colors
??????? {
??????????? get { return colors; }
??????????? set { colors = value; }
??????? }
??????? #endregion
??????? #region 自定義字體數組
??????? string[] fonts = { "Arial", "Georgia" };
??????? public string[] Fonts
??????? {
??????????? get { return fonts; }
??????????? set { fonts = value; }
??????? }
??????? #endregion
??????? #region 自定義隨機碼字符串序列(使用逗號分隔)
??????? string codeSerial = "0,1,2,3,4,5,6,7,8,9";
??????? public string CodeSerial
??????? {
??????????? get { return codeSerial; }
??????????? set { codeSerial = value; }
??????? }
??????? #endregion
??????? #region 產生波形濾鏡效果
??????? private const double PI = 3.1415926535897932384626433832795;
??????? private const double PI2 = PI * 3;
??????? /// <summary>
??????? /// 正弦曲線Wave扭曲圖片
??????? /// </summary>
??????? /// <param name="srcBmp">圖片路徑</param>
??????? /// <param name="bXDir">如果扭曲則選擇為True</param>
??????? /// <param name="nMultValue">波形的幅度倍數，越大扭曲的程度越高，一般為3</param>
??????? /// <param name="dPhase">波形的起始相位，取值區間[0-2*PI)</param>
??????? /// <returns></returns>
??????? public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
??????? {
??????????? System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
??????????? // 將位圖背景填充為白色
??????????? System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
??????????? graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
??????????? graph.Dispose();
??????????? double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
??????????? for (int i = 0; i < destBmp.Width; i++)
??????????? {
??????????????? for (int j = 0; j < destBmp.Height; j++)
??????????????? {
??????????????????? double dx = 0;
??????????????????? dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
??????????????????? dx += dPhase;
??????????????????? double dy = Math.Sin(dx);
??????????????????? // 取得當前點的顏色
??????????????????? int nOldX = 0, nOldY = 0;
??????????????????? nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
??????????????????? nOldY = bXDir ? j : j + (int)(dy * dMultValue);

??????????????????? System.Drawing.Color color = srcBmp.GetPixel(i, j);
??????????????????? if (nOldX >= 0 && nOldX < destBmp.Width
???????????????????? && nOldY >= 0 && nOldY < destBmp.Height)
??????????????????? {
??????????????????????? destBmp.SetPixel(nOldX, nOldY, color);
??????????????????? }
??????????????? }
??????????? }
??????????? return destBmp;
??????? }
??????? #endregion
??????? #region 生成校驗碼圖片
??????? public Bitmap CreateImageCode(string code)
??????? {
??????????? int fSize = FontSize;
??????????? int fWidth = fSize + Padding;
??????????? int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
??????????? int imageHeight = fSize * 2 + Padding;
??????????? System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
??????????? Graphics g = Graphics.FromImage(image);
??????????? g.Clear(BackgroundColor);
??????????? Random rand = new Random();
??????????? //給背景添加隨機生成的燥點
??????????? if (this.Chaos)
??????????? {
??????????????? Random sjs = new Random();//產生隨機數
??????????????? Pen pen = new Pen(Color.FromArgb(sjs.Next(255), sjs.Next(255), sjs.Next(255)), 2);
??????????????? //定義鋼筆，用于繪制干擾線
??????????????? Pen pen1 = new Pen(Color.FromArgb(sjs.Next(255), sjs.Next(255), sjs.Next(255)), 1);
??????????????? Pen pen2 = new Pen(Color.FromArgb(sjs.Next(255), sjs.Next(255), sjs.Next(255)), 1);
??????????????? //生成兩條橫向的干擾線
??????????????? for (int i = 0; i < 4; i++)
??????????????? {
??????????????????? //定義起點
??????????????????? Point p1 = new Point(0, sjs.Next(image.Height));
??????????????????? //定義終點
??????????????????? Point p2 = new Point(image.Width, sjs.Next(image.Height));
??????????????????? //繪制直線
??????????????????? g.DrawLine(pen1, p1, p2);
??????????????? }
??????????????? //生成兩條縱向的干擾線
??????????????? for (int i = 0; i < 4; i++)
??????????????? {
??????????????????? //定義起點
??????????????????? Point p1 = new Point(sjs.Next(image.Width), 0);
??????????????????? //定義終點
??????????????????? Point p2 = new Point(sjs.Next(image.Width), image.Height);
??????????????????? //繪制直線
??????????????????? g.DrawLine(pen2, p1, p2);
??????????????? }
??????????????? int c = Length * 10;

??????????????? for (int i = 0; i < c; i++)
??????????????? {
??????????????????? int x = rand.Next(image.Width);
??????????????????? int y = rand.Next(image.Height);
??????????????????? g.DrawRectangle(pen, x, y, 1, 1);
??????????????? }
??????????? }
??????????? int left = 0, top = 0, top1 = 1, top2 = 1;
??????????? int n1 = (imageHeight - FontSize - Padding * 2);
??????????? int n2 = n1 / 4;
??????????? top1 = n2;
??????????? top2 = n2 * 2;
??????????? Font f;
??????????? Brush b;
??????????? int cindex, findex;
??????????? //隨機字體和顏色的驗證碼字符
??????????? for (int i = 0; i < code.Length; i++)
??????????? {
??????????????? cindex = rand.Next(Colors.Length - 1);
??????????????? findex = rand.Next(Fonts.Length - 1);
??????????????? f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
??????????????? b = new System.Drawing.SolidBrush(Colors[cindex]);
??????????????? if (i % 2 == 1)
??????????????? {
??????????????????? top = top2;
??????????????? }
??????????????? else
??????????????? {
??????????????????? top = top1;
??????????????? }
??????????????? left = i * fWidth;
??????????????? g.DrawString(code.Substring(i, 1), f, b, left, top);
??????????? }
??????????? //畫一個邊框 邊框顏色為Color.Gainsboro
??????????? g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
??????????? g.Dispose();
??????????? //產生波形（Add By 51aspx.com）
??????????? image = TwistImage(image, true, 8, 4);
??????????? return image;
??????? }
??????? #endregion
??????? #region 將創建好的圖片輸出到頁面并返回隨機數
??????? public static string CreateImageOnPage(HttpContext context)
??????? {
??????????? authcode aa = new authcode();
??????????? string code = aa.CreateCode();
??????????? System.IO.MemoryStream ms = new System.IO.MemoryStream();
??????????? Bitmap image = aa.CreateImageCode(code);
??????????? image.Save(ms, ImageFormat.Jpeg);//圖片保存在指定流中
??????????? context.Response.ClearContent();
??????????? context.Response.ContentType = "image/Jpeg";
??????????? context.Response.BinaryWrite(ms.GetBuffer());
??????????? ms.Close();
??????????? ms = null;
??????????? image.Dispose();
??????????? image = null;
??????????? return code;
??????? }
??????? #endregion
??????? #region 生成隨機字符碼
??????? public string CreateCode()
??????? {
??????????? int codeLen = Length;
??????????? string[] arr = CodeSerial.Split(',');
??????????? string code = "";
??????????? int randValue = -1;
??????????? Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
??????????? for (int i = 0; i < codeLen; i++)
??????????? {
??????????????? randValue = rand.Next(0, arr.Length - 1);
??????????????? code += arr[randValue];
??????????? }
??????????? return code;
??????? }
??????? #endregion
??? }
}

轉載于:https://www.cnblogs.com/zhwl/archive/2011/07/14/2106074.html

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