Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪音点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
最后就是后台事件，判断当前验证码是否正确。
代码如下：
复制代码 代码如下:
#region 页面控件事件
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (String.Compare(Request.Cookies["yzmcode"].Value, tbxCheckNo.Text, true) != 0)
{
Response.Write("<script>alert('验证码错误!')</script>");
}
else
{
// Response.Write("<script>alert('验证吗正确!!!')</script>");
}
}
#endregion
您可能感兴趣的文章: