crimage.aspx

ajax+md5实现网站登陆注册模块源代码

<%@ Page ContentType="image/jpeg" Language="C#" %>
<%@ Import namespace="System.Drawing" %>
<%@ Import namespace="System.Drawing.Imaging" %>
<%@ Import namespace="System.Drawing.Text" %>

<script language="C#" runat=server>

void Page_Load(Object sender , EventArgs e) 
{
	Bitmap objBitmap;
	Graphics objGraphics;
	string  strString;
    RectangleF objRec;

    string valStr;
    valStr = this.CrValStr();
    Session["valStr"] = valStr.Trim();
    
	// Create Bitmap
    strString = Session["valStr"].ToString();
	objBitmap = new Bitmap( 150,50 );

	// Create Graphics
	objGraphics = Graphics.FromImage( objBitmap );
	objGraphics.Clear( Color.WhiteSmoke  );

	// Prepare Font
	Font  objFont = new Font( "Arial",40 );


    objRec = new RectangleF(6,0,150,100);
	objGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
	objGraphics.DrawString( strString, objFont, Brushes.Red ,objRec  );

	// Display Bitmap
	objBitmap.Save( Response.OutputStream, ImageFormat.Jpeg );
}
     string CrValStr()
    {
        string validate = null;
        Random objRandom = new Random();
        for (int i = 0; i < 4; i++)
        {
            validate += objRandom.Next(9).ToString();
        }
        return validate;
    }

</Script>