Copy codeThe Code is as follows:
<% @ 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 ();"> Why Not? </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 = "OK" 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 ('incorrect verification code! '); </Script> ");
LitErrorMsg. Text = "The entered verification code is incorrect! ";
}
Else
{
// Response. Write ("<script> javascript: alert ('the entered verification code is correct! '); </Script> ");
LitErrorMsg. Text = "The entered verification code is correct! ";
}
}
}
# Region
Private void ValidateMethod ()
{
If (Request. Cookies ["CheckCode"] = null)
{
LitErrorMsg. Text = "your browser settings have been disabled for Cookies. You must set the options that allow the browser to use Cookies before using 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 incorrect! </Font> ";
LitErrorMsg. Visible = true;
Return;
}
Else
{
LitErrorMsg. Text = "<font color = green> congratulations, the verification code is entered correctly! </Font> ";
LitErrorMsg. Visible = true;
}
}
# Endregion
}
// VerifyCode. aspx is the default generated code
Copy codeThe Code is as follows:
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 [do not forget New imitation 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 (); // obtain the random code
Session ["ValidateCode"] = VNum. ToUpper (); // obtain the verification code for later verification
This. CreateImageOnPage (VNum, this. Context); // output image
// Cookie Authentication mode. Use Cookies to obtain the verification code value.
// Response. Cookies. Add (new HttpCookie ("CheckCode", code. ToUpper ()));
}
# Endregion
# Region verification code length (the default length of four verification codes)
Int length = 4;
Public int Length
{
Get {return length ;}
Set {length = value ;}
}
# Endregion
# Region Verification Code font size (40 pixels by default for displaying distortion effects, which can be modified by yourself)
Int fontSize = 22;
Public int FontSize
{
Get {return fontSize ;}
Set {fontSize = value ;}
}
# Endregion
# Region border population (1 pixel by default)
Int padding = 2;
Public int Padding
{
Get {return padding ;}
Set {padding = value ;}
}
# Endregion
# Whether region outputs dry points (no output by default)
Bool chaos = true;
Public bool Chaos
{
Get {return chaos ;}
Set {chaos = value ;}
}
# Endregion
# Region output dry point color (gray by default)
Color chaosColor = Color. LightGray;
Public Color ChaosColor
{
Get {return chaosColor ;}
Set {chaosColor = value ;}
}
# Endregion
# Region custom background color (white by default)
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 = ", 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 generates a waveform 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"> True for distortion </param>
/// <Param name = "nMultValue"> the amplitude multiple of the waveform. The larger the waveform is, the higher the distortion is. Generally, it is 3. </param>
/// <Param name = "dPhase"> start phase of the waveform, value range: [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 in 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 );
// Obtain the color of the current vertex
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
& Amp; nOldY & gt; = 0 & amp; nOldY <destBmp. Height)
{
DestBmp. SetPixel (nOldX, nOldY, color );
}
}
}
Return destBmp;
}
# Endregion
# Region generate Verification Code 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 random dry points 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 Verification Code 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 a border with Color. Gainsboro
G. DrawRectangle (new Pen (Color. Gainsboro, 0), 0, 0, image. Width-1, image. Height-1 );
G. Dispose ();
// Generate a waveform (Add By 51aspx.com)
Image = TwistImage (image, true, 4, 4 );
Return image;
}
# Endregion
# Region outputs the created image to the page
Public void CreateImageOnPage (string code, HttpContext context)
{
Response. BufferOutput = true; // note
Response. Cache. SetExpires (DateTime. Now. AddMilliseconds (-1); // note
Response. Cache. SetCacheability (HttpCacheability. NoCache); // note
Response. AppendHeader ("Pragma", "No-Cache"); // note
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 generate random escape 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 Another Verification Code style GenerateVerifyImage (int length)
/// <Summary>
/// Output the created image to the page
/// </Summary>
Public void GenerateVerifyImage (int nLen)
{
String validateCode = ""; // The generated Verification Code
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 random background color
Int nRed, nGreen, nBlue; // ternary background 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 with a color that is slightly darker than the background
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 );
}
// Use the character set, which can be expanded immediately and control the probability of occurrence of Characters
String strCode = "0123456789 abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ";
// 4. cyclically obtain characters and draw
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 character acquisition
ValidateCode + = c. ToString ();
// Draw 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; // note
Response. Cache. SetExpires (DateTime. Now. AddMilliseconds (-1); // note
Response. Cache. SetCacheability (HttpCacheability. NoCache); // note
Response. AppendHeader ("Pragma", "No-Cache"); // note
// 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>
/// Obtain the image width of the Verification Code
/// </Summary>
/// <Paramname = "validateNumLength"> Verification code length </param>
/// <Returns> </returns>
Public static int GetImagewidth (int validateNumLength)
{
Return (int) (13 * validateNumLength + 5 );
}
/// <Summary>
/// Obtain the height of the Verification Code
/// </Summary>
/// <Returns> </returns>
Public static int GetImageHeight ()
{
Return 25;
}
# Endregion
}
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