Obtaining a verification code from the WebBrowser control

1, first introduce the basic control (drag control everyone will, I do not introduce each), see;

2, add Mshtml Reference, the steps are as follows:

Solution-Right-click "References"-? Add Reference-Locate the microsoft.mshtml component under. NET-click OK;

3. Write the code, double-click the Button1 button to add the event; (note the using MSHTML in the reference class;)

Target website: http://admin.3cjz.cn/reg.php?username=ghdhdd

Full code:

2. using System;
4. using System.Collections.Generic;
6. using System.ComponentModel;
8. using System.Data;
10. using System.Drawing;
12. using System.Linq;
14. using System.Text;
16. using System.Windows.Forms;
18. using Mshtml;
22. namespace getcodeimg
24. {
26. Public Partial class Form1: Form
28. {
30. Public Form1 ()
32. {
34. InitializeComponent ();
36. }
40. private void button1_click (object sender, EventArgs e)
42. {
44. //Open Web page via WebBrowser control
46. WebBrowser1.Navigate (TextBox1.Text.Trim ());
48. //Check whether the Web page has been loaded completed
50. While (Webbrowser1.readystate < Webbrowserreadystate.complete)
52. Application.doevents (); //If not finished loading, continue loading
54. //Get Verification code element based on CAPTCHA ID
56. HtmlElement Imagecodetag = webBrowser1.Document.GetElementById ("vcodesrc");
58. //Call the Getcodeimage method to get the verification code
60. Image finalimage = Getcodeimage (WebBrowser1, Imagecodetag);
62. //Verification Code display
64. pictureBox1.Image = Finalimage;
66. }
68. Private Image getcodeimage (WebBrowser webcontrolname, HtmlElement imgetag)
70. {
72. //Get all the content of the webpage
74. HTMLDocument Hdoc = (htmldocument) WebControlName.Document.DomDocument;
76. //Get content from the body tag of the Web page
78. HTMLBody hbody = (HTMLBody) hdoc.body;
80. //Create an interface
82. Ihtmlcontrolrange HCR = (ihtmlcontrolrange) hbody.createcontrolrange ();
84. //Get image address
86. IHTMLControlElement himg = (ihtmlcontrolelement) imgetag.domelement;
88. //Add a picture to the interface
90. Hcr. Add (himg);
92. //Copy picture to memory
94. Hcr.execcommand ("Copy", false, null);
96. //Get pictures from Pasteboard
98. Image codeimage = Clipboard.getimage ();
100. //Return the obtained verification code
102. return codeimage;
104. }
106. }
108. }

4. Verification procedure

PS: I am still a rookie-level program ape, if you write a mistake, welcome correction.

Obtaining a verification code from the WebBrowser control