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C# C/S 图片验证码功能源码

2011-08-30 14:55  通用C#系统架构  阅读(4676)  评论(1编辑  收藏  举报

运行效果如图

用法如下:

        /// <summary>
        
/// 显示验证码
        
/// </summary>
        
/// <returns>验证码</returns>
        private void GetVerifyCode()
        {
            VerifyCodeImage verifyCodeImage 
= new VerifyCodeImage();
            
// 取随机码
            string code = verifyCodeImage.CreateVerifyCode().ToUpper();
            
// 输出图片
            this.picVerifyCode.Image = verifyCodeImage.CreateImage(code, 3);
            
this.picVerifyCode.Tag = code;
        }

 

        private void picVerifyCode_DoubleClick(object sender, EventArgs e)
        {
            
this.GetVerifyCode();
            
// this.txtVerifyCode.Clear();
            this.txtVerifyCode.SelectAll();
            
this.txtVerifyCode.Focus();
        }

 

源码如下:

//-----------------------------------------------------------------
// All Rights Reserved , Copyright (C) 2011 , Hairihan TECH, Ltd. 
//-----------------------------------------------------------------

using System;
using System.Drawing;
using System.Web;

namespace DotNet.Utilities
{
    
public class VerifyCodeImage
    {
        
public VerifyCodeImage()
        {
        }

        
#region 验证码长度(默认4个验证码的长度)
        
int length = 4;
        
public int Length
        {
            
get { return length; }
            
set { length = value; }
        }
        
#endregion

        
#region 验证码字体大小(为了显示扭曲效果,默认40像素,可以自行修改)
        
int fontSize = 50;
        
public int FontSize
        {
            
get { return fontSize; }
            
set { fontSize = value; }
        }
        
#endregion

        
#region 边框补(默认1像素)
        
int padding = 2;
        
public int Padding
        {
            
get { return padding; }
            
set { padding = value; }
        }
        
#endregion

        
#region 是否输出燥点(默认不输出)
        
bool chaos = true;
        
public bool Chaos
        {
            
get { return chaos; }
            
set { chaos = value; }
        }
        
#endregion

        
#region 输出燥点的颜色(默认灰色)
        Color chaosColor 
= Color.LightGray;
        
public Color ChaosColor
        {
            
get { return chaosColor; }
            
set { chaosColor = value; }
        }
        
#endregion

        
#region 自定义背景色(默认白色)
        Color backgroundColor 
= Color.White;
        
public Color BackgroundColor
        {
            
get { return backgroundColor; }
            
set { backgroundColor = value; }
        }
        
#endregion

        
#region 自定义随机颜色数组
        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 自定义字体数组
        
string[] fonts = { "Arial""Georgia" };
        
public string[] Fonts
        {
            
get { return fonts; }
            
set { fonts = value; }
        }
        
#endregion

        
#region 自定义随机码字符串序列(使用逗号分隔)
        
//  去除 0,1,i,l,o,I,L,O
        string codeSerial = "2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";
        
public string CodeSerial
        {
            
get { return codeSerial; }
            
set { codeSerial = value; }
        }
        
#endregion

        
#region 产生波形滤镜效果
        
//private const double PI = 3.1415926535897932384626433832795;
        private const double PI2 = 6.283185307179586476925286766559;
        
/// <summary>
        
/// 正弦曲线Wave扭曲图片(Edit By 51aspx.com)
        
/// </summary>
        
/// <param name="srcBmp">图片路径</param>
        
/// <param name="bXDir">如果扭曲则选择为True</param>
        
/// <param name="nMultValue">波形的幅度倍数,越大扭曲的程度越高,一般为3</param>
        
/// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>
        
/// <returns></returns>
        public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
        {
            System.Drawing.Bitmap bitmap 
= new Bitmap(srcBmp.Width, srcBmp.Height);

            
// 将位图背景填充为白色
            System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(bitmap);
            graphics.FillRectangle(
new SolidBrush(System.Drawing.Color.White), 00, bitmap.Width, bitmap.Height);
            graphics.Dispose();

            
double dBaseAxisLen = bXDir ? (double)bitmap.Height : (double)bitmap.Width;

            
for (int i = 0; i < bitmap.Width; i++)
            {
                
for (int j = 0; j < bitmap.Height; j++)
                {
                    
double dx = 0;
                    dx 
= bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
                    dx 
+= dPhase;
                    
double dy = Math.Sin(dx);

                    
// 取得当前点的颜色
                    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 < bitmap.Width
                     
&& nOldY >= 0 && nOldY < bitmap.Height)
                    {
                        bitmap.SetPixel(nOldX, nOldY, color);
                    }
                }
            }
            
return bitmap;
        }
        
#endregion

        
#region 生成校验码图片
        
public Bitmap CreateImage(string code, double multValue)
        {
            
int fSize = FontSize;
            
int fWidth = fSize + Padding;

            
int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
            
int imageHeight = fSize * 2 + Padding;

            System.Drawing.Bitmap bitmap 
= new System.Drawing.Bitmap(imageWidth, imageHeight);

            Graphics graphics 
= Graphics.FromImage(bitmap);

            graphics.Clear(BackgroundColor);

            Random rand 
= new Random();

            
// 给背景添加随机生成的燥点
            if (this.Chaos)
            {

                Pen pen 
= new Pen(ChaosColor, 0);
                
int c = Length * 10;

                
for (int i = 0; i < c; i++)
                {
                    
int x = rand.Next(bitmap.Width);
                    
int y = rand.Next(bitmap.Height);

                    graphics.DrawRectangle(pen, x, y, 
11);
                }
            }

            
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 font;
            Brush brush;

            
int cindex, findex;

            
// 随机字体和颜色的验证码字符
            for (int i = 0; i < code.Length; i++)
            {
                cindex 
= rand.Next(Colors.Length - 1);
                findex 
= rand.Next(Fonts.Length - 1);

                font 
= new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
                brush 
= new System.Drawing.SolidBrush(Colors[cindex]);

                
if (i % 2 == 1)
                {
                    top 
= top2;
                }
                
else
                {
                    top 
= top1;
                }

                left 
= i * fWidth;

                graphics.DrawString(code.Substring(i, 
1), font, brush, left, top);
            }

            
// 画一个边框 边框颜色为Color.Gainsboro
            graphics.DrawRectangle(new Pen(Color.Gainsboro, 0), 00, bitmap.Width - 1, bitmap.Height - 1);
            graphics.Dispose();

            
// 产生波形
            bitmap = TwistImage(bitmap, true, multValue, 4);

            
return bitmap;
        }
        
#endregion

        
#region 生成随机字符码
        
public string CreateVerifyCode(int codeLength)
        {
            
if (codeLength == 0)
            {
                codeLength 
= Length;
            }
            
string[] arr = CodeSerial.Split(',');
            
string code = "";
            
int randValue = -1;
            Random random 
= new Random(unchecked((int)DateTime.Now.Ticks));
            
for (int i = 0; i < codeLength; i++)
            {
                randValue 
= random.Next(0, arr.Length - 1);
                code 
+= arr[randValue];
            }
            
return code;
        }

        
public string CreateVerifyCode()
        {
            
return CreateVerifyCode(0);
        }
        
#endregion


        
#region 将创建好的图片输出到页面
        
/// <summary>
        
/// 将创建好的图片输出到页面
        
/// </summary>
        
/// <param name="code">验证码</param>
        
/// <param name="multValue">扭曲度(越大越扭曲)</param>
        
/// <param name="httpContext">上下文</param>
        public void CreateImageOnPage(string code, double multValue, HttpContext httpContext)
        {
            System.IO.MemoryStream memoryStream 
= new System.IO.MemoryStream();
            Bitmap bitmap 
= this.CreateImage(code, multValue);
            bitmap.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Jpeg);
            httpContext.Response.ClearContent();
            httpContext.Response.ContentType 
= "image/Jpeg";
            httpContext.Response.BinaryWrite(memoryStream.GetBuffer());

            memoryStream.Close();
            memoryStream 
= null;
            bitmap.Dispose();
            bitmap 
= null;
        }
        
#endregion
    }
}

 

 



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