/// <summary>
/// 自定义图片验证码函数
/// 该函数将生成一个图片验证码，并将生成的code存放于Session["VerifyCode"]变量内。
/// </summary>
/// <param name="codeLength">验证码长度</param>
/// <param name="codeFontsize">字体大小</param>
/// <value>该函数将生成一个图片验证码，并把生成的code存放于Session["VerifyCode"]变量内</value>
public static void VerifyCode(int codeLength, int codeFontsize)
{
double PI = 6.283185307179586476925286766559;
int m_ImgWidth = (int)(codeLength * (codeFontsize + 2.5)) + 8; //图像宽度
int m_ImgHeight = codeFontsize * 2 + 2; //图像高度
string[] m_Fonts = { "Arial", "Georgia" }; //随机字体
string[] m_StrarraySource ={"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"}; //随机字符所包含范围
Color[] m_ColorarraySource ={Color.Maroon,Color.Red,Color.IndianRed,Color.Tomato,Color.OrangeRed,
Color.SaddleBrown,Color.Goldenrod,Color.Olive,Color.OliveDrab,Color.ForestGreen,
Color.Green,Color.SeaGreen,Color.LightSeaGreen,Color.Teal,Color.CadetBlue,
Color.SteelBlue,Color.DodgerBlue,Color.CornflowerBlue,Color.Blue,
Color.MediumSlateBlue,Color.BlueViolet,Color.DarkViolet,Color.Fuchsia,
Color.DeepPink,Color.Crimson};//随机字符颜色所包含范围
string m_StrCode = ""; //用于存放生成的随机数
Random m_StrRandom = new Random();
for (int i = 0; i < codeLength; i++)
{
m_StrCode += m_StrarraySource[m_StrRandom.Next(0, m_StrarraySource.Length)]; //生成随机字符串
}
Bitmap m_BitmapImg = new Bitmap(m_ImgWidth, m_ImgHeight);//定义一个画板
Graphics m_GraphicsSl = Graphics.FromImage(m_BitmapImg);//在画板上定义绘图的实例
Rectangle m_RectangleJx = new Rectangle(0, 0, m_ImgWidth, m_ImgHeight);//定义一个矩形
m_GraphicsSl.FillRectangle(new SolidBrush(Color.White), m_RectangleJx);//填充矩形
//bPsl.DrawString(code, new Font("新宋体", 12), new SolidBrush(Color.Black), bPjx);//在矩形内画出字符串
for (int i = 0; i < m_StrCode.Length; i++)
{
m_GraphicsSl.DrawString(m_StrCode.Substring(i, 1), new Font(m_Fonts[m_StrRandom.Next(0, m_Fonts.Length)].ToString(), codeFontsize, FontStyle.Bold), new SolidBrush(Color.FromKnownColor(m_ColorarraySource[m_StrRandom.Next(0, m_ColorarraySource.Length)].ToKnownColor())), i * (codeFontsize + 2) + 2, Convert.ToBoolean(i % 2) ? (m_ImgHeight - codeFontsize - 4) / 2 : (m_ImgHeight - codeFontsize - 4) / 4);
}
//生成干扰
Random m_RandomR = new Random();
//生成干扰线条
Pen pen = new Pen(new SolidBrush(Color.FromKnownColor(m_ColorarraySource[m_StrRandom.Next(0, m_ColorarraySource.Length)].ToKnownColor())), 1);
for (int i = 0; i < m_ImgHeight / 10; i++)
{
m_GraphicsSl.DrawLine(pen, new Point(m_RandomR.Next(0, m_ImgWidth), m_RandomR.Next(0, m_ImgHeight)), new Point(m_RandomR.Next(0, m_ImgWidth), m_RandomR.Next(0, m_ImgHeight)));
}
//生成干扰点
//SolidBrush m_SolidbrushP2 = new SolidBrush(ColorTranslator.FromHtml("#f0f0f0"));//干扰点颜色
SolidBrush m_SolidbrushP2 = new SolidBrush(Color.FromKnownColor(m_ColorarraySource[m_StrRandom.Next(0, m_ColorarraySource.Length)].ToKnownColor()));//干扰点颜色
for (int i = 0; i < m_ImgWidth / 10; i++)
{
for (int j = 0; j < m_ImgHeight / 5; j++)
{
m_GraphicsSl.FillEllipse(m_SolidbrushP2, m_RandomR.Next(m_ImgWidth), j, m_RandomR.Next(2), 2);//在矩形内画干扰点
}
}
m_GraphicsSl.Dispose();
//正弦曲线Wave扭曲图片
Bitmap m_TempBmp = new Bitmap(m_ImgWidth, m_ImgHeight);
// 将位图背景填充为白色
Graphics m_Graph = Graphics.FromImage(m_TempBmp);
m_Graph.FillRectangle(new SolidBrush(Color.White), 0, 0, m_ImgWidth, m_ImgHeight);
m_Graph.Dispose();
for (int i = 0; i < m_ImgWidth; i++)
{
for (int j = 0; j < m_ImgHeight; j++)
{
double m_dx = (PI * (double)j) / (double)m_ImgHeight + 3;
double m_dy = Math.Sin(m_dx);
// 取得当前点的颜色
int m_nOldX = 0, m_nOldY = 0;
m_nOldX = i + (int)(m_dy * 2);
m_nOldY = j;
Color m_color = m_BitmapImg.GetPixel(i, j);
if (m_nOldX >= 0 && m_nOldX < m_ImgWidth && m_nOldY >= 0 && m_nOldY < m_ImgHeight)
{
m_TempBmp.SetPixel(m_nOldX, m_nOldY, m_color);
}
}
}
m_BitmapImg = m_TempBmp;
//生成边框
Graphics m_GraphicsSl2 = Graphics.FromImage(m_BitmapImg);//在画板上定义绘图的实例
m_GraphicsSl2.DrawRectangle(new Pen(Color.FromKnownColor(m_ColorarraySource[m_StrRandom.Next(0, m_ColorarraySource.Length)].ToKnownColor()), 0), 0, 0, m_ImgWidth - 1, m_ImgHeight - 1);
//bPimg.Save(fullfilename, System.Drawing.Imaging.ImageFormat.Gif);//保存为文件
m_BitmapImg.Save(System.Web.HttpContext.Current.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);//将图片显示出来
//释放资源
m_GraphicsSl.Dispose();
m_BitmapImg.Dispose();
//返回值 //将字符串保存到Session中，以便需要时进行验证
System.Web.HttpContext.Current.Session["VerifyCode"] = m_StrCode;
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
namespace FeiBoLaiTe.Admin
{
public partial class Yanzhengma : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
GenImg(GenCode(4));
}
}
private string GenCode(int num)
{
string[] source ={"0","1","2","3","4","5","6","7","8","9",
"A","B","C","D","E","F","G","H","I","J","K","L","M","N",
"O","P","Q","R","S","T","U","V","W","X","Y","Z"};
string code = "";
Random rd = new Random();
for (int i = 0; i < num; i++)
{
code += source[rd.Next(0, source.Length)];
}
return code;
}
//生成图片
private void GenImg(string code)
{
Bitmap myPalette = new Bitmap(45, 16);//定义一个画板
Graphics gh = Graphics.FromImage(myPalette);//在画板上定义绘图的实例
Rectangle rc = new Rectangle(0, 0, 45, 16);//定义一个矩形
gh.FillRectangle(new SolidBrush(Color.CornflowerBlue), rc);//填充矩形
gh.DrawString(code, new Font("宋体", 13), new SolidBrush(Color.White), rc);//在矩形内画出字符串
myPalette.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);//将图片显示出来
Session["code"] = code;//将字符串保存到Session中，以便需要时进行验证
gh.Dispose();
myPalette.Dispose();
}
}
}
private string GenerateCheckCode()
{
int number;
string strCode = string.Empty;
//随机种子
//Random random = new Random();
//for (int i = 0; i < 4; i++) //验证码长度为4
//{
// //随机整数
// number = random.Next();
// //字符从0-9，A-Z中产生，对应的ASCII码为48-57，65-90
// number = number % 36;
// if (number < 10)
// {
// number += 48;
// }
// else
// {
// number += 55;
// }
// strCode += ((char)number).ToString();
//}
//产生随机字符串
strCode = GenCode(4);
//将字符串保存在Cookies
Response.Cookies.Add(new HttpCookie("gst_checkCode", strCode));
return strCode;
}
private string GenCode(int num)
{
string[] source ={"0","1","2","3","4","5","6","7","8","9",
"A","B","C","D","E","F","G","H","i","J","K","L","M","N",
"o","P","Q","R","S","T","U","V","W","X","Y","Z"};
string code = "";
Random rd = new Random();
for (int i = 0; i < num; i++)
{
code += source[rd.Next(0, source.Length)];
}
return code;
}
//生成图片
private void CreateCheckCodeImage(string checkCode)
{
//若检验码为空，则直接返回
if (checkCode == null || checkCode.Trim() == string.Empty)
return;
//根据验证码长度确定输出图片的长度
System.Drawing.Bitmap image = new Bitmap((int)Math.Ceiling(float.Parse((checkCode.Length * 15).ToString())), 20);
//创建Graphics对象
System.Drawing.Graphics g = Graphics.FromImage(image);
//生成随机数种子
Random random = new Random();
//清除图片背景颜色
g.Clear(Color.White);
//画背景图片的噪音线10条
for (int i = 0; i < 6; i++)
{
//噪音线起点坐标(x1,y1),终点坐标(x2,y2)
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
//用银色线画出噪音线
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
//输出图片中校验码的字体:12号Arial,粗斜体
Font font = new Font("Arial", 12, FontStyle.Bold);
//线性渐变画刷
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Width), Color.Blue, Color.Purple, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪点50个
for (int i = 0; i < 50; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片段边框线
g.DrawRectangle(new Pen(Color.SaddleBrown), 0, 0, image.Width - 1, image.Height - 1);
//创建内存流用于输出图片
System.IO.MemoryStream ms = new System.IO.MemoryStream();
//图片格式指定为png
image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
//清除缓冲区流中的所有输出
Response.ClearContent();
//输出流的Http Mime类型设置为"image/Png"
Response.ContentType = "image/Png";
//输出图片的二进制流
Response.BinaryWrite(ms.ToArray());
//释放Bitmap和Graphics对象
g.Dispose();
image.Dispose();
}
时间： 2024-10-27 17:28:47