/// <summary>
/// Gets the dictionary captcha text.
/// </summary>
/// <param name="extended">The extended.</param>
/// <returns>dictionary captcha text.</returns>
protected virtual String GetDictionaryCaptchaText(Boolean extended = false)
{
if (WordsFile == null || WordsFile.Length == 0)
{
return(null);
}
var filePath = SimpleCaptcha.MapPath(WordsFile);
if (!File.Exists(filePath))
{
return(null);
}
try
{
var file = new FileInfo(filePath);
var fileSize = file.Length;
using (var fs = File.OpenRead(filePath))
using (var sr = new StreamReader(fs))
{
var firstLine = sr.ReadLine();
var lineLength = firstLine.Length;
var lineCount = 1;
unchecked
{
lineCount = (Int32)(fileSize / firstLine.Length);
}
var lineNum = _random.Next(0, lineCount);
lineLength += Environment.NewLine.Length;
fs.Seek(lineLength * lineNum, SeekOrigin.Begin);
sr.DiscardBufferedData();
var text = sr.ReadLine().Trim();
if (extended)
{
var textChars = text.ToCharArray();
var vocals = new List <Char>()
{
'a', 'e', 'i', 'o', 'u'
};
for (int i = 0; i < textChars.Length; i++)
{
if (vocals.Contains(text[i]) && _random.Next(0, 1) == 1)
{
textChars[i] = vocals[_random.Next(0, 4)];
}
}
text = new String(textChars);
}
return(text);
}
}
catch
{
return(null);
}
}
protected override void OnPreInit(EventArgs e)
{
Response.Clear();
var captcha = new SimpleCaptcha();
captcha.SessionName = CaptchaSessionName;
captcha.WordsFile = "~/App_Data/words-en.txt";
using (var image = captcha.CreateImage())
{
Response.ContentType = "image/png";
image.Save(Response.OutputStream, ImageFormat.Png);
Response.End();
}
}
public static void GenerateAll()
{
var foldeName = String.Format("{0:yyyyMMddHHmmss}", DateTime.Now);
var captcha = new SimpleCaptcha();
captcha.MinWordLength = 6;
captcha.MaxWordLength = 6;
captcha.Scale = 6;
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 10; j++)
{
captcha.FontConfig = SimpleCaptcha.Fonts[i];
using (var image = captcha.CreateImage())
{
var path = String.Format("{0}{1}\\{2}-{3}.png", AppDomain.CurrentDomain.BaseDirectory, foldeName, i, j);
Directory.CreateDirectory(Path.GetDirectoryName(path));
image.Save(path, ImageFormat.Png);
}
}
}
}
