Asp.net|web| Control | Verification code asp.net design and design concepts and other such as Asp,jsp,php,perl
And so are not the same, almost completely object-oriented design! The reuse of code is its
One of the major differences, asp.net in addition to the use of include, also provides
A more characteristic web control, including: Ascx form and control with design-time support
Pieces [This article belongs to the latter], in order to familiarize yourself with these new concepts, I wrote a Web control myself.
In the actual project to run well, later, to have time, I will continue to improve.
How to use the Validatecode control:
First step:
Compile the original code I provided, and then, on the Studio.NET 2003 toolbar, select Add/Remove items to select the compiled DLL file.
Step Two:
The toolbar will be one more Web control Validatecode, do a Web form, on the Studio.NET 2003 development interface, directly drag the control onto the WebForm, ok!
Step Three:
In this control's Graphicok event obtains, the authentication code The character information, uses in compares with the user entry!
Last step:
In the root directory of the Web site, build a temp directory (or you can specify the directory yourself) to store the authentication code
Pictures, don't worry, the code will automatically delete useless pictures!
The original code is as follows:
Using System;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.ComponentModel;
Using System.IO;
Using System.Drawing;
Using System.Drawing.Drawing2D;
Using System.Drawing.Imaging;
Namespace Webvalidatecode
{
<summary>
Summary description of the Validatecode.
Designer: Wang Haibo 2004-11-20
</summary>
///
public enum Graphictype
{
JPG = 0,
Gif = 1,
Png = 2,
BMP = 3,
}
[ToolboxBitmap (@ "D:\DotnetApp\ValidateCode\ValidateCode.bmp")]//Set the icon for the control on the Toolbox
public class ValidateCode:System.Web.UI.WebControls.WebControl, INamingContainer
{
private int pcodelen=5;
private int pchartwidth=100;
private int pchartheight=20;
Private Graphictype Pcharttype;
private string Pauthencode;
private string Ptempimageurlpath= "/temp";
private string Pauthenimagefullname;
private string Pauthenimagefullurl;
Generate a checksum code variable start
Private Bitmap validateimage;
Private Graphics G;
Generate a checksum code variable end
Private textbox txt=new textbox ();
Private System.Web.UI.WebControls.Image img= new System.Web.UI.WebControls.Image ();
#region Define control Events
public delegate void Graphiccreated (object sender, EventArgs e);
public event EventHandler Graphicok; Triggered after validating picture generation ends
protected virtual void Ongraphicok (object sender, EventArgs e)
{
if (Graphicok!= null)
{
invokes the delegates.
Graphicok (sender, E);
}
}
#endregion
#region Control Properties
Build the length of the checksum code
[Bindable (True), browsable (True), Category ("appearance"), DefaultValue (True), Description ("need to verify the length of the code, recommended between the 5~8 bit!")]
public int Codelength
{
Get
{
return Pcodelen;
}
Set
{
Pcodelen = value;
}
}
Build the length of the checksum code
[Bindable (True), browsable (True), Category ("appearance"), DefaultValue (True), Description ("Generate a temporary store path for a captcha picture," Requirement must be a virtual directory under the site! ")]
public string Tempimageurlpath
{
Get
{
return ptempimageurlpath;
}
Set
{
Ptempimageurlpath = value;
}
}
[Bindable (True), browsable (True), Category ("appearance"), DefaultValue (graphictype.jpg), Description ("Select type to generate a checksum diagram file" (JPG; Gif; Png; BMP)! ")]
Public Graphictype ChartType
{
Get
{
return pcharttype;
}
Set
{
Pcharttype = value;
}
}
Generate the width of the checksum code picture
public int Chartwidth
{
Get
{
return pchartwidth;
}
Set
{
Pchartwidth = value;
}
}
Build the height of the checksum code picture
public int Chartheight
{
Get
{
return pchartheight;
}
Set
{
Pchartheight = value;
}
}
The checksum code that needs to be generated
public string Authencode
{
Get
{
return pauthencode;
}
Set
{
Pauthencode = value;
}
}
#endregion
<summary>
Renders this control to the specified output parameter.
</summary>
<param name= "Output" > HTML writer to write </param>
protected override void Render (HtmlTextWriter output)
{
System.Web.UI.WebControls.Image Objimage;
TextBox Objtxt;
Drawing the contained controls
Objimage = (System.Web.UI.WebControls.Image) controls[0];
Objtxt = (TextBox) controls[1];
if (pauthencode==null)
Pauthencode=getvalidatecode ();
Ongraphicok (This,eventargs.empty);
Getrandomimage (Pauthencode);
Objimage.imageurl=pauthenimagefullurl;
Objimage.rendercontrol (output);
}
<summary>
To add a child control to a control
</summary>
protected override void CreateChildControls ()
{
Controls.Add (BTN);
Controls.Add (IMG);
Controls.Add (TXT);
}
<summary>
Initialization of a property when the control is load
</summary>
<param name= "E" ></param>
protected override void OnLoad (System.EventArgs e)
{
Eraseoldgraphic (); Delete an expired picture
}
<summary>
Generate a random
</summary>
private void Makerandomfilename ()
{
String strrandname=datetime.now.ticks.tostring () + ". jpg";
Pauthenimagefullname=this. Page.mappath (tempimageurlpath) +@ "\" +strrandname;
pauthenimagefullurl=tempimageurlpath+ "/" +strrandname;
}
private void Getrandomimage (string strvalidatecode)
{
Generates the full name of the immediate picture, and the full URL
Makerandomfilename ();
Validateimage = new Bitmap (Pchartwidth, Pchartheight, Pixelformat.format24bpprgb); // . FORMAT24BPPRGB);
g = Graphics.fromimage (validateimage);
G.clear (Color.lightgray);
g.DrawString (Strvalidatecode, New Font ("Song Body", 16,fontstyle.bold), New SolidBrush (color.darkred), New PointF (2,2));
for (int i=0;i<strvalidatecode.length;i++)
{
Random r = new Random ();
PointF startpos=new PointF (R.next (3,6) + (R.next (12,14) *i), R.next ( -1,2));
g.DrawString (Strvalidatecode.substring (i,1), New Font ("XXFarEastFont-Arial", 14,fontstyle.italic), New SolidBrush (Color.Blue), STARTPOS);
}
G.fillrectangle (New LinearGradientBrush (0,0), new Point (120,30), Color.FromArgb (0,0,0,0), Color.FromArgb (255,255,255,255)), 0,0,120,30);
Switch (pcharttype)
{
Case Graphictype.jpg:
Validateimage.save (Pauthenimagefullname, imageformat.jpeg);
Break
Case Graphictype.gif:
Validateimage.save (Pauthenimagefullname, imageformat.gif);
Break
Case Graphictype.png:
Validateimage.save (Pauthenimagefullname, imageformat.png);
Break
Case Graphictype.bmp:
Validateimage.save (Pauthenimagefullname, imageformat.bmp);
Break
Default
Validateimage.save (Pauthenimagefullname, imageformat.jpeg);
Break
}
Validateimage.dispose ();
G.dispose ();
}
<summary>
Dynamic selection of generating parity codes from elements of numbers and letters
</summary>
private String Getvalidatecode ()
{
Char[] s = new char[]{' 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 '};
String num = "";
Random r = new Random ();
Defines the number of digits of a verification code based on the length required by the user
for (int i = 0; i < codelength; i++)
{
num + + s[r.next (0, S.length)]. ToString ();
}
return num;
}
<summary>
Clears temporary picture records for more than 20 seconds
</summary>
<returns> returns true successfully, Failure returns false</returns>
public bool Eraseoldgraphic ()
{
Try
{
DirectoryInfo dinfo=new DirectoryInfo (this. Page.mappath (Ptempimageurlpath));
Fileinfo[] Fileset;
if (dinfo.exists)
{
Switch (pcharttype)
{
Case Graphictype.jpg:
Fileset=dinfo.getfiles ("*.jpg");
Break
Case Graphictype.gif:
Fileset=dinfo.getfiles ("*.gif");
Break
Case Graphictype.png:
Fileset=dinfo.getfiles ("*.png");
Break
Case Graphictype.bmp:
Fileset=dinfo.getfiles ("*.bmp");
Break
Default
Fileset=dinfo.getfiles ("*.jpg");
Break
}
foreach (FileInfo FileInfo in Fileset)
{
if (fileinfo.exists)
{
DateTime Dts=datetime.now;
DateTime Dtc=fileinfo.creationtime;
TimeSpan TS=DTS-DTC;
if (TS. SECONDS>20)
{
Fileinfo.delete ();
}
}
}
}
return true;
}
catch (IOException IoE)
{
return false;
}
}
}
}
