public static string ReStr(string paraName)
{
string str = HttpContext.Current.Request.Params[paraName];
if (str == null)
{
throw new Exception("" + paraName + "参数获取为null");
}
if (SqlFilter2(str))
{
throw new Exception("危险字符串:" + str + "");
}
if (paraName == "para") //ajax请求开始
{
string s = ReStr("s", "web");
if (s == "app")
{
string GetMemberId = ReStr("GetMemberId");
CookieSings.AddCookieStr("CurrentMemberId", JiaMi.encMe(GetMemberId));
}
}
return(System.Web.HttpUtility.UrlDecode(str));
}
/// <summary>
/// 绘制验证码
/// </summary>
public void CreateImage()
{
int int_ImageWidth = this.text.Length * letterWidth;
CookieSings.AddCookieStr("yzm", this.text);
Bitmap image = new Bitmap(int_ImageWidth, letterHeight);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.White);
for (int i = 0; i < 2; i++)
{
int x1 = Next(image.Width - 1);
int x2 = Next(image.Width - 1);
int y1 = Next(image.Height - 1);
int y2 = Next(image.Height - 1);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
int _x = -12, _y = 0;
for (int int_index = 0; int_index < this.text.Length; int_index++)
{
_x += Next(12, 16);
_y = Next(-2, 2);
string str_char = this.text.Substring(int_index, 1);
str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper();
Brush newBrush = new SolidBrush(GetRandomColor());
Point thePos = new Point(_x, _y);
g.DrawString(str_char, fonts[Next(fonts.Length - 1)], newBrush, thePos);
}
for (int i = 0; i < 10; i++)
{
int x = Next(image.Width - 1);
int y = Next(image.Height - 1);
image.SetPixel(x, y, Color.FromArgb(Next(0, 255), Next(0, 255), Next(0, 255)));
}
image = TwistImage(image, true, Next(1, 3), Next(4, 6));
g.DrawRectangle(new Pen(Color.LightGray, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1));
this.image = image;
System.IO.MemoryStream memoryStream = new MemoryStream();
image.Save(memoryStream, ImageFormat.Jpeg);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/gif";
HttpContext.Current.Response.BinaryWrite(memoryStream.ToArray());
image.Dispose();
HttpContext.Current.Response.End();
}
/// <summary>
/// 以默认的大小和默认的字符个数产生图片
/// </summary>
/// <returns></returns>
public Image GetImage()
{
Bitmap image = new Bitmap(width, height);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.White);
Random random = new Random();
string randString = GetMix(random);
// do
// {
////使用DateTime.Now.Millisecond作为生成随机数的参数，增加随机性
// randString += RandCharString.Substring(random.Next(DateTime.Now.Millisecond)%RandCharString.Length, 1);
// }
// while (randString.Length < 4);
float emSize = (float)width / randString.Length;
Font font = new Font("Arial", emSize, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
Pen pen = new Pen(Color.Silver);
#region 画图片的背景噪音线
int x1, y1, x2, y2;
for (int i = 0; i < 25; i++)
{
x1 = random.Next(image.Width);
y1 = random.Next(image.Height);
x2 = random.Next(image.Width);
y2 = random.Next(image.Height);
g.DrawLine(pen, x1, y1, x2, y2);
}
#endregion
#region 画图片的前景噪音点
for (int i = 0; i < 100; i++)
{
x1 = random.Next(image.Width);
y1 = random.Next(image.Height);
image.SetPixel(x1, y1, Color.FromArgb(random.Next(Int32.MaxValue)));
}
#endregion
CookieSings.AddCookieStr("yzm", randString);
g.DrawString(randString, font, Brushes.Blue, 2, 2);
g.Dispose();
return(image);
}
