ASP.NET development of complete code with no refresh captcha
- 2020-05-10 18:01:49
- OfStack
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title> No title page </title>
<script type="text/javascript">
function DoFresh() {
document.getElementById("Image1").src = "VerifyCode.aspx";
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>
Verification code: <asp:TextBox ID="txtValidateCode" runat="server"></asp:TextBox>
</td>
<td>
<asp:Image ID="Image1" runat="server" />
<a href="javascript:DoFresh();"> Can't see ?</a>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<br />
<asp:Literal ID="litErrorMsg" runat="server"></asp:Literal>
<asp:Button ID="btnSubmit" runat="server" Text=" determine " onclick="btnSubmit_Click" />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Image1.ImageUrl = "VerifyCode.aspx";
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (Session["ValidateCode"] != null)
{
string outputValidateCode = Session["ValidateCode"] as string;
string inputValidateCode = txtValidateCode.Text.Trim();
if (string.Compare(outputValidateCode, inputValidateCode, true) != 0)
{
//Response.Write("<script>javascript:alert(' Input verification code error! ');</script>");
litErrorMsg.Text = " Input verification code error! ";
}
else
{
//Response.Write("<script>javascript:alert(' The verification code entered is correct! ');</script>");
litErrorMsg.Text = " The verification code entered is correct! ";
}
}
}
#region Call the following method to implement client-side saving Cookie Authentication mode
private void ValidateMethod()
{
if (Request.Cookies["CheckCode"] == null)
{
litErrorMsg.Text = " Your browser Settings have been disabled Cookies , you must set the browser to allow use Cookies Option after the use of the system. ";
litErrorMsg.Visible = true;
return;
}
if (String.Compare(Request.Cookies["CheckCode"].Value, TextBox1.Text.ToString().Trim(), true) != 0)
{
litErrorMsg.Text = "<font color=red> Sorry, the verification code is wrong! </font>";
litErrorMsg.Visible = true;
return;
}
else
{
litErrorMsg.Text = "<font color=green> Congratulations, captcha input correct! </font>";
litErrorMsg.Visible = true;
}
}
#endregion
}
// VerifyCode.aspx is the default generated code
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.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.IO;
public partial class VerifyCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//GenerateValidateCode();
GenerateVerifyImage(4);//GenerateVerifyImage(int length)
}
#region No refresh copy google Waveform distortion color] verification code style 0___GenerateValidateCode()
private void GenerateValidateCode()
{
this.Length = this.length;
this.FontSize = this.fontSize;
this.Chaos = this.chaos;
this.BackgroundColor = this.backgroundColor;
this.ChaosColor = this.chaosColor;
this.CodeSerial = this.codeSerial;
this.Colors = this.colors;
this.Fonts = this.fonts;
this.Padding = this.padding;
string VNum = this.CreateVerifyCode(); // Take random code
Session["ValidateCode"] = VNum.ToUpper();// Get the captcha for later verification
this.CreateImageOnPage(VNum, this.Context); // The output image
//Cookie Validation mode, use Cookies Take the value of the captcha
//Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper()));
}
#endregion
#region Length of verification code ( The default 4 The length of the captcha )
int length = 4;
public int Length
{
get { return length; }
set { length = value; }
}
#endregion
#region Captcha font size ( To display the warping effect, default 40 The pixels can be changed by themselves )
int fontSize = 22;
public int FontSize
{
get { return fontSize; }
set { fontSize = value; }
}
#endregion
#region Border to fill ( The default 1 pixel )
int padding = 2;
public int Padding
{
get { return padding; }
set { padding = value; }
}
#endregion
#region Whether output dryness ( Default no output )
bool chaos = true;
public bool Chaos
{
get { return chaos; }
set { chaos = value; }
}
#endregion
#region Output the color of the dry spot ( The default gray )
Color chaosColor = Color.LightGray;
public Color ChaosColor
{
get { return chaosColor; }
set { chaosColor = value; }
}
#endregion
#region Customize the background color ( The default white )
Color backgroundColor = Color.White;
public Color BackgroundColor
{
get { return backgroundColor; }
set { backgroundColor = value; }
}
#endregion
#region Custom random color array
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 Custom font array
string[] fonts = { "Arial", "Georgia" };
public string[] Fonts
{
get { return fonts; }
set { fonts = value; }
}
#endregion
#region Custom random code string sequence ( Separated by commas )
string codeSerial = "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,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";
public string CodeSerial
{
get { return codeSerial; }
set { codeSerial = value; }
}
#endregion
#region Produces a wave filter effect
private const double PI = 3.1415926535897932384626433832795;
private const double PI2 = 6.283185307179586476925286766559;
/// <summary>
/// Sine curve Wave Distorted image
/// </summary>
/// <param name="srcBmp"> Image path </param>
/// <param name="bXDir"> If distorted, choose to be True</param>
/// <param name="nMultValue"> The larger the amplitude multiple of the waveform, the higher the degree of distortion, 1 As for the 3</param>
/// <param name="dPhase"> The initial phase of the waveform, the value interval [0-2*PI)</param>
/// <returns></returns>
public Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
// Fill the bitmap background with white
System.Drawing.Graphics graph = Graphics.FromImage(destBmp);
graph.FillRectangle(new SolidBrush(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);
// Gets the color of the current point
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 Generate a checksum image
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();
// Add a randomly generated dryness to the background
if (this.Chaos)
{
Pen pen = new Pen(ChaosColor, 0);
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;
// Random font and color captcha characters
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);
}
// draw 1 A border The border color is Color.Gainsboro
g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
g.Dispose();
// Generate waveform ( Add By 51aspx.com )
image = TwistImage(image, true, 4, 4);
return image;
}
#endregion
#region Output the created image to the page
public void CreateImageOnPage(string code, HttpContext context)
{
Response.BufferOutput = true; // Pay special attention to
Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));// Pay special attention to
Response.Cache.SetCacheability(HttpCacheability.NoCache);// Pay special attention to
Response.AppendHeader("Pragma", "No-Cache"); // Pay special attention to
MemoryStream ms = new MemoryStream();
Bitmap image = this.CreateImageCode(code);
image.Save(ms, ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = "image/JPEG";
Response.BinaryWrite(ms.ToArray());
Response.End();
ms.Close();
ms = null;
image.Dispose();
image = null;
}
#endregion
#region Generates a random character code
public string CreateVerifyCode(int codeLen)
{
if (codeLen == 0)
{
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;
}
public string CreateVerifyCode()
{
return CreateVerifyCode(0);
}
#endregion
#region On the other 1 A captcha style GenerateVerifyImage(int length)
/// <summary>
/// Output the created image to the page
/// </summary>
public void GenerateVerifyImage(int nLen)
{
string validateCode = "";// Generated captcha
int nBmpWidth = GetImagewidth(nLen);
int nBmpHeight = GetImageHeight();
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(nBmpWidth, nBmpHeight);
// Bend the image
TwistImage(bmp, true, 12, 2);
// 1. Generate a random background color
int nRed, nGreen, nBlue; // The background of the 3 Yuan color
System.Random rd = new Random((int)System.DateTime.Now.Ticks);
nRed = rd.Next(255) % 128 + 128;
nGreen = rd.Next(255) % 128 + 128;
nBlue = rd.Next(255) % 128 + 128;
// 2. Fill in the bitmap background
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(bmp);
graph.FillRectangle(new SolidBrush(System.Drawing.Color.FromArgb(nRed, nGreen, nBlue))
, 0
, 0
, nBmpWidth
, nBmpHeight);
// 3. Draw interference lines that are slightly deeper than the background 1 Some of the color of the
int nLines = 3;
System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Color.FromArgb(nRed - 17, nGreen - 17, nBlue - 17), 2);
for (int a = 0; a < nLines; a++)
{
int x1 = rd.Next() % nBmpWidth;
int y1 = rd.Next() % nBmpHeight;
int x2 = rd.Next() % nBmpWidth;
int y2 = rd.Next() % nBmpHeight;
graph.DrawLine(pen, x1, y1, x2, y2);
}
// The character set adopted can be expanded and the frequency of characters can be controlled
string strCode = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
// 4. Loop to get the character and draw it
for (int i = 0; i < nLen; i++)
{
int x = (i * 13 + rd.Next(3));
int y = rd.Next(4) + 1;
// Determine the font
System.Drawing.Font font = new System.Drawing.Font("Courier New",// Text font type
12 + rd.Next() % 4,// Text font size
System.Drawing.FontStyle.Bold);// Text font style
char c = strCode[rd.Next(strCode.Length)]; // Random fetch character
validateCode += c.ToString();
// Draw the characters
graph.DrawString(c.ToString(),
font,
new SolidBrush(System.Drawing.Color.FromArgb(nRed - 60 + y * 3, nGreen - 60 + y * 3, nBlue - 40 + y * 3)),
x,
y);
}
Session["ValidateCode"] = validateCode;
// Bend the image
TwistImage(bmp, true, 4, 4);
Response.BufferOutput = true; // Pay special attention to
Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));// Pay special attention to
Response.Cache.SetCacheability(HttpCacheability.NoCache);// Pay special attention to
Response.AppendHeader("Pragma", "No-Cache"); // Pay special attention to
// 5. Output byte stream
MemoryStream bstream = new MemoryStream();
bmp.Save(bstream, ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = "image/JPEG";
Response.BinaryWrite(bstream.ToArray());
Response.End();
bstream.Close();
bstream = null;
bmp.Dispose();
bmp = null;
graph.Dispose();
}
///<summary>
/// Get the width of the captcha image
///</summary>
///<paramname="validateNumLength"> The length of the captcha </param>
///<returns></returns>
public static int GetImagewidth(int validateNumLength)
{
return (int)(13 * validateNumLength + 5);
}
///<summary>
/// Get the height of the captcha
///</summary>
///<returns></returns>
public static int GetImageHeight()
{
return 25;
}
#endregion
}