生成验证码
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int nRet = 0;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string checkCode = String.Empty;
System.Random random = new Random();
string strMark = string.Empty;
int nNum1 = random.Next(30);
int nNum2 = random.Next(20);
int nNum3 = random.Next(12);
int nNum4 = random.Next(10);
int nMark = random.Next(10);
if (nMark % 2 == 0)
{
strMark = "加 ";
}
else
{
strMark = "乘 ";
}
if (strMark == "加 ")
{
nRet = nNum1 + nNum2;
checkCode = nNum1.ToString() + strMark + nNum2.ToString() + "等于";
}
else
{
nRet = nNum3 * nNum4;
checkCode = nNum3.ToString() + strMark + nNum4.ToString() + "等于";
}
Session["CheckCode"] = null;
Session.Remove("CheckCode");
Session["CheckCode"] = nRet;
Session.Timeout = 1;
//HttpCookie cookie = new HttpCookie("CheckCode");
//cookie.Value = nRet.ToString();
//Response.Cookies.Add(cookie);
//读取Cookie方法
//Response.Write(Request.Cookies["userrole"].Value);
CreateImages(checkCode);
}
}
/// <summary>
/// 生成验证图片
/// </summary>
/// <param name="checkCode">验证字符</param>
protected void CreateImages(string checkCode)
{
int iwidth = (int)(checkCode.Length * 15);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 30);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.White);
//定义颜色
Color[] c = { Color.Red, Color.Blue, Color.Orange, Color.Green, Color.Black, Color.DarkBlue, Color.Red, Color.YellowGreen, Color.Red };
//定义字体
string[] font = { "Arial", "Microsoft Sans Serif", "Comic Sans MS", "Verdana", "Candara", "Comic Sans MS" };
Random rand = new Random();
//随机输出噪点
for (int i = 0; i < 1; i++)
{
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
g.DrawPie(new Pen(Color.Azure, 9), x, y, 6, 6, 1, 1);
}
//输出不同字体和颜色的验证码字符
for (int i = 0; i < checkCode.Length; i++)
{
int cindex = rand.Next(7);
int findex = rand.Next(6);
Font _font = new System.Drawing.Font(font[findex], 14, System.Drawing.FontStyle.Bold);
Brush b = new System.Drawing.SolidBrush(c[cindex]);
int ii = 4;
if ((i + 1) % 2 == 0)
{
ii = 2;
}
g.DrawString(checkCode.Substring(i, 1), _font, b, 3 + (i * 12), ii);
}
//画一个边框
g.DrawRectangle(new Pen(Color.Red, 0), 400, 0, image.Width - 1, image.Height - 1);
//输出到浏览器
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/jpeg";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string checkCode = String.Empty;
System.Random random = new Random();
string strMark = string.Empty;
int nNum1 = random.Next(30);
int nNum2 = random.Next(20);
int nNum3 = random.Next(12);
int nNum4 = random.Next(10);
int nMark = random.Next(10);
if (nMark % 2 == 0)
{
strMark = "加 ";
}
else
{
strMark = "乘 ";
}
if (strMark == "加 ")
{
nRet = nNum1 + nNum2;
checkCode = nNum1.ToString() + strMark + nNum2.ToString() + "等于";
}
else
{
nRet = nNum3 * nNum4;
checkCode = nNum3.ToString() + strMark + nNum4.ToString() + "等于";
}
Session["CheckCode"] = null;
Session.Remove("CheckCode");
Session["CheckCode"] = nRet;
Session.Timeout = 1;
//HttpCookie cookie = new HttpCookie("CheckCode");
//cookie.Value = nRet.ToString();
//Response.Cookies.Add(cookie);
//读取Cookie方法
//Response.Write(Request.Cookies["userrole"].Value);
CreateImages(checkCode);
}
}
/// <summary>
/// 生成验证图片
/// </summary>
/// <param name="checkCode">验证字符</param>
protected void CreateImages(string checkCode)
{
int iwidth = (int)(checkCode.Length * 15);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 30);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.White);
//定义颜色
Color[] c = { Color.Red, Color.Blue, Color.Orange, Color.Green, Color.Black, Color.DarkBlue, Color.Red, Color.YellowGreen, Color.Red };
//定义字体
string[] font = { "Arial", "Microsoft Sans Serif", "Comic Sans MS", "Verdana", "Candara", "Comic Sans MS" };
Random rand = new Random();
//随机输出噪点
for (int i = 0; i < 1; i++)
{
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
g.DrawPie(new Pen(Color.Azure, 9), x, y, 6, 6, 1, 1);
}
//输出不同字体和颜色的验证码字符
for (int i = 0; i < checkCode.Length; i++)
{
int cindex = rand.Next(7);
int findex = rand.Next(6);
Font _font = new System.Drawing.Font(font[findex], 14, System.Drawing.FontStyle.Bold);
Brush b = new System.Drawing.SolidBrush(c[cindex]);
int ii = 4;
if ((i + 1) % 2 == 0)
{
ii = 2;
}
g.DrawString(checkCode.Substring(i, 1), _font, b, 3 + (i * 12), ii);
}
//画一个边框
g.DrawRectangle(new Pen(Color.Red, 0), 400, 0, image.Width - 1, image.Height - 1);
//输出到浏览器
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/jpeg";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
}
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