public static string generateRandom(int length, randomType type)
{
string allowed_chars = string.Empty;
string upper_chars = string.Empty;
Random random_number;
char[] chars;
int allowed_length = 0;
int charAt = 0;
random_number = new Random();
chars = new char[length];
switch (type)
{
case randomType.alpha:
allowed_chars = "abcdefghijkmnopqrstuvwxyz";
break;
case randomType.alphaNumeric:
allowed_chars = "abcdefghijkmnopqrstuvwxyz1234567890";
break;
case randomType.numeric:
allowed_chars = "0123456789";
break;
}
allowed_length = allowed_chars.Length - 1;
for (int int_count = 0; int_count < length; int_count++)
{
charAt = Convert.ToInt32((allowed_length * random_number.NextDouble()));
chars[int_count] = allowed_chars[charAt];
if (Convert.ToInt32(random_number.Next(20)) % 2 == 0)
{
upper_chars = chars[int_count].ToString().ToUpper();
chars[int_count] = upper_chars[0];
}
}
return(new string(chars));
}
/*public static void generateCaptcha(HttpContext context, int length, randomType type, int width, int height, System.Drawing.Color top_color, System.Drawing.Color bottom_color, System.Drawing.Color text_color)
* {
* System.Drawing.Drawing2D.HatchBrush hatchBrush = null;
*
* string embedded_string = commonFunctions.generateRandom(length, type);
*
* commonVariables.SetSessionVariable("vCode", commonEncryption.encrypting(embedded_string));
*
* char[] char_array = null;
*
* char_array = new char[embedded_string.Length + embedded_string.Length];
*
* for (int int_count = 0; int_count < embedded_string.Length; int_count++)
* {
* char_array[int_count + int_count] = embedded_string[int_count];
* char_array[int_count + int_count + 1] = " "[0];
* }
*
* //Captcha String
* System.Drawing.FontFamily fontFamily = new System.Drawing.FontFamily("Comic Sans MS");
* // - Generate Random
* //int randomsize = 5;
* Random random = new Random(DateTime.Now.Millisecond);
*
* // Create a new 32-bit bitmap image.
* using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
* {
* // Create a graphics object for drawing.
* using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
* {
* g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
* System.Drawing.Rectangle rect = new System.Drawing.Rectangle(0, 0, width, height);
*
* // Fill in the background.
* using (hatchBrush = new System.Drawing.Drawing2D.HatchBrush(System.Drawing.Drawing2D.HatchStyle.DiagonalCross, top_color, bottom_color))
* {
* g.FillRectangle(hatchBrush, rect);
*
* // Set up the text font.
* System.Drawing.SizeF size = default(System.Drawing.SizeF);
* float fontSize = rect.Height + 25;
* System.Drawing.Font font = null;
* System.Drawing.StringFormat format = new System.Drawing.StringFormat();
* format.Alignment = System.Drawing.StringAlignment.Center;
* format.LineAlignment = System.Drawing.StringAlignment.Center;
*
* // Adjust the font size until the text fits within the image.
* do
* {
* fontSize -= 5;
* font = new System.Drawing.Font(fontFamily, fontSize, System.Drawing.FontStyle.Bold);
* size = g.MeasureString(new string(char_array), font, new System.Drawing.SizeF(width, height), format);
* } while (size.Width > rect.Width);
*
* // Create a path using the text and warp it randomly.
* System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
* path.AddString(new string(char_array), font.FontFamily, Convert.ToInt32(font.Style), font.Size, rect, format);
*
* float v = 6f;
* System.Drawing.PointF[] points = {
* new System.Drawing.PointF(random.Next(rect.Width) / v, random.Next(rect.Height) / v),
* new System.Drawing.PointF(rect.Width - random.Next(rect.Width) / v, random.Next(rect.Height) / v),
* new System.Drawing.PointF(random.Next(rect.Width) / v, rect.Height - random.Next(rect.Height) / v),
* new System.Drawing.PointF(rect.Width - random.Next(rect.Width) / v, rect.Height - random.Next(rect.Height) / v)
* };
* System.Drawing.Drawing2D.Matrix matrix = new System.Drawing.Drawing2D.Matrix();
* matrix.Translate(0f, 0f);
* path.Warp(points, rect, matrix, System.Drawing.Drawing2D.WarpMode.Perspective, 0f);
*
* // Draw the text.
* using (hatchBrush = new System.Drawing.Drawing2D.HatchBrush(System.Drawing.Drawing2D.HatchStyle.ForwardDiagonal, text_color, text_color))
* {
* g.FillPath(hatchBrush, path);
* }
*
* font.Dispose();
* }
* }
*
* context.Response.ContentType = "image/png";
* bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Png);
* }
* }*/
public static string generateCaptcha(HttpContext context, int length, randomType type, int width, int height, System.Drawing.Color top_color, System.Drawing.Color bottom_color, System.Drawing.Color text_color)
{
System.Drawing.Drawing2D.HatchBrush hatchBrush = null;
string strCode = commonFunctions.generateRandom(length, type);
commonVariables.SetSessionVariable("vCode", commonEncryption.encrypting(strCode));
string strProcessRemark = "CommonFunction:" + strCode;
int intProcessSerialId = 0;
intProcessSerialId += 1;
commonAuditTrail.appendLog("system", "CommonFunction", "ParameterValidation", "DataBaseManager.DLL", "", "", "", "", strProcessRemark, Convert.ToString(intProcessSerialId), "", true);
//context.Session["vCode"] = commonEncryption.encrypting(strCode);
char[] char_array = null;
char_array = new char[strCode.Length + strCode.Length];
for (int int_count = 0; int_count < strCode.Length; int_count++)
{
char_array[int_count + int_count] = strCode[int_count];
char_array[int_count + int_count + 1] = " "[0];
}
//Captcha String
System.Drawing.FontFamily fontFamily = new System.Drawing.FontFamily("Comic Sans MS");
// - Generate Random
//int randomsize = 5;
Random random = new Random(DateTime.Now.Millisecond);
// Create a new 32-bit bitmap image.
using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
{
// Create a graphics object for drawing.
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
{
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
System.Drawing.Rectangle rect = new System.Drawing.Rectangle(0, 0, width, height);
// Fill in the background.
using (hatchBrush = new System.Drawing.Drawing2D.HatchBrush(System.Drawing.Drawing2D.HatchStyle.DiagonalCross, top_color, bottom_color))
{
g.FillRectangle(hatchBrush, rect);
// Set up the text font.
System.Drawing.SizeF size = default(System.Drawing.SizeF);
float fontSize = rect.Height + 25;
System.Drawing.Font font = null;
System.Drawing.StringFormat format = new System.Drawing.StringFormat();
format.Alignment = System.Drawing.StringAlignment.Center;
format.LineAlignment = System.Drawing.StringAlignment.Center;
// Adjust the font size until the text fits within the image.
do
{
fontSize -= 5;
font = new System.Drawing.Font(fontFamily, fontSize, System.Drawing.FontStyle.Bold);
size = g.MeasureString(new string(char_array), font, new System.Drawing.SizeF(width, height), format);
} while (size.Width > rect.Width);
// Create a path using the text and warp it randomly.
System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
path.AddString(new string(char_array), font.FontFamily, Convert.ToInt32(font.Style), font.Size, rect, format);
float v = 6f;
System.Drawing.PointF[] points =
{
new System.Drawing.PointF(random.Next(rect.Width) / v, random.Next(rect.Height) / v),
new System.Drawing.PointF(rect.Width - random.Next(rect.Width) / v, random.Next(rect.Height) / v),
new System.Drawing.PointF(random.Next(rect.Width) / v, rect.Height - random.Next(rect.Height) / v),
new System.Drawing.PointF(rect.Width - random.Next(rect.Width) / v, rect.Height - random.Next(rect.Height) / v)
};
System.Drawing.Drawing2D.Matrix matrix = new System.Drawing.Drawing2D.Matrix();
matrix.Translate(0f, 0f);
path.Warp(points, rect, matrix, System.Drawing.Drawing2D.WarpMode.Perspective, 0f);
// Draw the text.
using (hatchBrush = new System.Drawing.Drawing2D.HatchBrush(System.Drawing.Drawing2D.HatchStyle.ForwardDiagonal, text_color, text_color))
{
g.FillPath(hatchBrush, path);
}
font.Dispose();
}
}
context.Response.ContentType = "image/png";
bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Png);
return(strCode);
}
}
