C #. net code for generating image verification Codes

Note:
Long live. net...
The. net framework class library is really too strong. With GDI +, you can do more than N tasks.
Ad Time:
Shawl. qiu C # The CMS system is expected to start coding in 40 days. Now it is gradually being designed, so that it will not be necessary to ask for a job to do anything... alas.
PS: today, my job is terrible. If you want to recruit webpages, contact Mr. Qiu at 13435580019.
Wherever I go, I only need to pay for living, but the problem of accommodation and accommodation must be solved.
Shawl. qiu
2007-02-01
Http://blog.csdn.net/btbtd
Class checkcode:
Copy codeThe Code is as follows:
<% @ Page Language = "C #" AutoEventWireup = "True" %>
<% @ Import Namespace = "System. Drawing" %>
<% @ Import Namespace = "System. Drawing. Drawing2D" %>
<% @ Import Namespace = "System. Web" %>
<Script runat = "server">
Private void Page_Load (object sender, System. EventArgs e)
{
String sRndStr = checkcode. rndStr (4 );
Checkcode. general (sRndStr );
}
/* Optional /*-----------------------------------------------------------------------------------*\
* Shawl. qiu c #. net checkcode class v1.0
\ * Optional \*-----------------------------------------------------------------------------------*/
// ------------------------------------------------------------------------- Begin class checkcode
Public class checkcode
{
// ------------------------------------- Begin event
Public checkcode ()
{
}
~ Checkcode ()
{
}
// ------------------------------------- End event
// ------------------------------------- Begin public constant
// ----------------------- Begin about
Public const String auSubject = "shawl. qiu c #. net checkcode class ";
Public const String auVersion = "v1.0 ";
Public const String au = "shawl. qiu ";
Public const String auEmail = "shawl.qiu@gmail.com ";
Public const String auBlog = "http://blog.csdn.net/btbtd ";
Public const String auCreateDate = "2007-2-1 ";
// ----------------------- End about
// ------------------------------------- End public constant
// ------------------------------------- Begin public static method
Public static void general (String sCc)
{
Int32 ccLen = sCc. Length;
String ccFtFm = "Arial ";
Int32 ccFtSz = 12;
Int32 ccWidth = ccLen * ccFtSz + 1;
Int32 ccHeight = ccFtSz + 5;
Using (Bitmap oImg = new Bitmap (ccWidth, ccHeight ))
{
Using (Graphics oGpc = Graphics. FromImage (oImg ))
{
HatchBrush hBrush = new HatchBrush (HatchStyle. DashedVertical,
Color. Yellow, Color. Silver );
OGpc. FillRectangle (hBrush, 0, 0, ccWidth, ccWidth );
OGpc. DrawString (sCc, new System. Drawing. Font (ccFtFm, ccFtSz, FontStyle. Bold ),
New System. Drawing. SolidBrush (Color. Black), 0, 0 );
// ----------------------- Border
Pen blackPen = new Pen (Color. Black, 1 );
OGpc. DrawLine (blackPen, 0, ccHeight, 0, 0); // left vertical line
OGpc. DrawLine (blackPen, 0, 0, ccWidth, 0); // Top horizontal line
OGpc. DrawLine (blackPen, ccWidth-1, 0, ccWidth-1, 20); // right vertical line
OGpc. DrawLine (blackPen, 0, ccHeight-1, ccWidth, ccHeight-1); // baseline
WriteImg (oImg );
}
}
} // End public static void general
Public static String rndStr (Int32 len)
{
String sTemp = "";
String sForRnd = ", 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 [] aRnd = sForRnd. Split (',');
Random oRnd = new Random ();
Int32 iArLen = aRnd. Length;
For (Int32 I = 0; I <len; I ++)
{
STemp + = aRnd [oRnd. Next (0, iArLen)];
}
Return sTemp;
} // End public static String rndStr
// ------------------------------------- End public static method
// ------------------------------------- Begin private static method
Private static void writeImg (Bitmap oImg)
{
Using (System. IO. MemoryStream MS = new System. IO. MemoryStream ())
{
OImg. Save (MS, System. Drawing. Imaging. ImageFormat. Png );
HttpContext. Current. Response. ClearContent ();
HttpContext. Current. Response. ContentType = "image/Png ";
HttpContext. Current. Response. BinaryWrite (ms. ToArray ());
}
} // End private static void writeImg
}
// ------------------------------------------------------------------------- End class checkcode
</Script>