验证码生成变形的文字-白红宇

using

System;

using

System.IO;

using

System.Web;

using

System.Web.UI;

using

System.Drawing;

using

System.Drawing.Drawing2D;

using

System.Drawing.Imaging;

namespace

Mis.Pages

{

public class think_test:System.Web.UI.Page

{

protected System.Web.UI.WebControls.TextBox TextBox1;

protected System.Web.UI.WebControls.Button Button1;

private Random rand = new Random();

protected override void OnInit(EventArgs e)

{

base.OnInit(e);

this.Load += new System.EventHandler(this.Page_Load);

}

private void Page_Load(object sender, System.EventArgs e)

{

string checkCode = CreateRandomCode(8);

Session["CheckCode"] = checkCode;

CreateImage(checkCode);

}

Web 窗体设计器生成的代码

private string CreateRandomCode(int codeCount)

{

string allChar = "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,W,X,Y,Z" ;

string[] allCharArray = allChar.Split(',');

string randomCode = "";

int temp = -1;

for(int i = 0; i < codeCount; i++)

{

if(temp != -1)

{

rand = new Random(i*temp*((int)DateTime.Now.Ticks));

}

int t = rand.Next(35);

if(temp == t)

{

return CreateRandomCode(codeCount);

}

temp = t;

randomCode += allCharArray[t];

}

return randomCode;

}

private void TransformG(Graphics g)

{

Matrix myMatrix = new Matrix();

int num1=rand.Next(80,900);

int num2=rand.Next(80,800);

float dd1=(float)num1;

float dd2=(float)num2;

dd1=dd1/10000;

dd2=dd2/10000;

float f1 = (float)(dd1);

float f2 = (float)(dd2);

myMatrix.Shear(f1,f2);

g.MultiplyTransform(myMatrix);

}

private void CreateImage(string checkCode)

{

int iwidth = (int)(checkCode.Length * 11.5);

System.Drawing.Bitmap image = new System.Drawing.Bitmap(150, 46);

Graphics g = Graphics.FromImage(image);

g.SmoothingMode=SmoothingMode.HighQuality;

Font f = new System.Drawing.Font("Arial", 18, System.Drawing.FontStyle.Regular);

Brush b = new System.Drawing.SolidBrush(Color.LightSlateGray);

Rectangle rect = new Rectangle(0, 0, 150, 46);

HatchBrush hatchBrush = new HatchBrush(

HatchStyle.SmallConfetti,

Color.LightGray,

Color.White);

g.FillRectangle(hatchBrush, rect);

Point[] myArray ={

new Point(rand.Next(150),rand.Next(46)),

new Point(rand.Next(150),rand.Next(46))

};

Pen myPen = new Pen(Color.Blue,1);

GraphicsPath myPath = new GraphicsPath();

myPath.AddBeziers(myArray);

g.DrawPath(myPen, myPath);

SizeF size;

float CPostion=1;

for(int i=0;i<checkCode.Length;i++)

{

TransformG(g);

size = g.MeasureString(checkCode[i].ToString(), f);

g.DrawString(checkCode[i].ToString(), f, b, CPostion, 7);

CPostion+=size.Width-1;

g.ResetTransform();

}

System.IO.MemoryStream ms = new System.IO.MemoryStream();

image.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);

g.Dispose();

image.Dispose();

Response.ClearContent();

Response.ContentType = "image/Jpeg";

Response.BinaryWrite(ms.ToArray());

}

private void Button1_Click(object sender, System.EventArgs e)

{

}

本文转自高海东博客园博客，原文链接：http://www.cnblogs.com/ghd258/archive/2005/10/12/253059.html，如需转载请自行联系原作者