C # Generate CAPTCHA program _php tutorial

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;
Using System.Web.UI.WebControls.WebParts;
Using System.Web.UI.HtmlControls;
Using System.Drawing;
public partial class Inc_ValidCode:System.Web.UI.Page
{
protected void Page_Load (object sender, EventArgs e)
{
Verifycode v = new Verifycode ();
V.length = 4;
V.fontsize = 14;
V.chaos = true;
V.backgroundcolor = Color.White;
V.chaoscolor = Color.lightgray;
V.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 ";
v.colors = this.colors; ' "" "" "" "" "" "" "" "" "" "" "" "" "" "" "." "" "" "" "" "" "" "" "" "" "" "" "" "". " ```````````````````````````````````````````````````````````````````
V.fonts = this.fonts;
v.padding = 2;
String code = V.createverifycode (); Fetch Random Code
V.createimageonpage (code, this.) Context); Output picture
RESPONSE.COOKIES.ADD (New HttpCookie ("Fcvalidtcode", code. ToUpper ()));//Use cookies to get the value of the verification code
session["Bao_code"] = code. ToUpper ();
}
public class Verifycode
{
#region Verification Code Length (the length of the default 6 captcha) #region The length of the verification code (the length of the default 6 captcha)
int length = 6;
public int Length
{
get {return length;}
set {length = value;}
}
#endregion
#region captcha Font Size (default 40 pixels, you can modify it yourself) #region captcha font size (to show distortion, default 40 pixels, you can modify it yourself)
int fontSize = 30;
public int FontSize
{
get {return fontSize;}
set {fontSize = value;}
}
#endregion
#region Border complement (default 1 pixels) #region Border complement (default 1 pixels)
int padding = 2;
public int Padding
{
get {return padding;}
set {padding = value;}
}
#endregion
#region whether to output dryness point (not output by default) #region whether to output dryness point (not output by default)
BOOL Chaos = true;
public bool Chaos
{
get {return chaos;}
set {chaos = value;}
}
#endregion
#region the color of the output dryness point (default gray) #region The color of the output dryness point (default gray)
Color chaoscolor = Color.lightgray;
Public Color Chaoscolor
{
get {return chaoscolor;}
set {Chaoscolor = value;}
}
#endregion
#region Custom background color (default white) #region Custom background color (default white)
Color backgroundcolor = Color.White;
Public Color BackgroundColor
{
get {return backgroundcolor;}
set {backgroundcolor = value;}
}
#endregion
#region custom Random color array #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
{www.jbxue.com
get {return colors;}
set {colors = value;}
}
#endregion
#region Custom font array #region custom font array
string[] fonts = {"Arial", "Georgia"};
Public string[] Fonts
{
get {return fonts;}
set {fonts = value;}
}
#endregion
#region custom Random code string sequences (separated by commas) #region custom random code string sequences (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 Waveform Filter Effect #region produces a waveform filter effect
Private Const Double PI = 3.1415926535897932384626433832795;
Private Const Double PI2 = 6.283185307179586476925286766559;
/**/
///

Sinusoidal wave distorted picture (Edit by 51aspx.com)
///
///Picture path
///True if Distortion is selected
///Amplitude multiples of the waveform, the greater the degree of distortion, the general is 3
///Starting phase of waveform, range of values [0-2*PI]
///
Public System.Drawing.Bitmap twistimage (Bitmap srcbmp, bool Bxdir, double dmultvalue, double dphase)
{
System.Drawing.Bitmap destbmp = new Bitmap (srcbmp.width, srcbmp.height);
Fills the bitmap background as white
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage (destbmp);
Graph. FillRectangle (New SolidBrush (System.Drawing.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 + +)
{//Www.jbxue.com
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 check code picture #region Generate check code picture
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 dry point 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;
Verification code characters for random fonts and colors
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 border color of 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, 0, 4);
return image;
}
#endregion
#region will create a good picture output to the page #region will create a good picture output to the page
public void Createimageonpage (string code, HttpContext context)
{
System.IO.MemoryStream ms = new System.IO.MemoryStream ();
Bitmap image = this. Createimagecode (code);
Image. Save (MS, System.Drawing.Imaging.ImageFormat.Jpeg);
Context. Response.clearcontent ();
Context. Response.ContentType = "Image/jpeg";
Context. Response.BinaryWrite (Ms. GetBuffer ());
Ms. Close ();
ms = NULL;
Image. Dispose ();
image = NULL;
}
#endregion
#region Generate random character code #region generate 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
}
}

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