/// <summary>
/// 传入验证码图片返回验证码字符
/// </summary>
/// <param name="imgSrc"></param>
/// <returns>验证码字符窜</returns>
public string GetCodeString(Image imgSrc)
{
if (m_ci == null)
{
throw new Exception("Please load CodeInfo");
}
if (m_ci.GetChars().Count == 0)
{
throw new Exception("Can not found font libary");
}
string strCode = string.Empty;
int nBlackCount = 0, nWhiteCount = 0;
Image img_dark = null;
List <Rectangle> lstChar = null;
if (m_ci.IsAutoSelectRect)
{
m_ci.CodeCount = m_ci.CodeRectangles.Count;
}
for (int i = 0, len = m_ci.CodeCount == 0 ? 1 : m_ci.BinaryValues.Length; i < len; i++)
{
img_dark = this.GetBinaryImage(imgSrc, m_ci.BinaryValues[i], out nBlackCount, out nWhiteCount, m_ci.Express);
if (nBlackCount > nWhiteCount)
{
img_dark = this.ReverseColors(img_dark);
}
if (m_ci.RectangleCut.Size != img_dark.Size)
{
Bitmap bmp = new Bitmap(m_ci.RectangleCut.Width, m_ci.RectangleCut.Height);
using (Graphics g = Graphics.FromImage(bmp)) {
g.DrawImage(img_dark, new Rectangle(Point.Empty, bmp.Size), m_ci.RectangleCut, GraphicsUnit.Pixel);
img_dark = bmp;
}
}
lstChar = this.GetCharRect((Bitmap)img_dark, m_ci.PixelMin, m_ci.PixelMax);
if (lstChar.Count == m_ci.CodeCount)
{
break;
}
}
if (!m_ci.IsAutoSelectRect)
{
lstChar = m_ci.CodeRectangles;
}
foreach (var v in lstChar)
{
strCode += this.GetBestSameChar((Bitmap)img_dark, v);
}
return(strCode.Replace("-", ""));
}
/// <summary>
/// 从样本中获取最相似的图像并返回字符
/// </summary>
/// <param name="imgDarkCodeImage">验证码图像</param>
/// <param name="rect">字符所在的区域</param>
/// <returns>最相识的字符</returns>
private char GetBestSameChar(Image imgDarkCodeImage, Rectangle rect)
{
char chCode = '*';
using (Bitmap bmpChar = new Bitmap(rect.Width, rect.Height))
{
using (Graphics g = Graphics.FromImage(bmpChar))
{
g.DrawImage(imgDarkCodeImage, new Rectangle(0, 0, rect.Width, rect.Height), rect, GraphicsUnit.Pixel);
int nSameCount = 0;
foreach (var v in m_ci.GetChars())
{
int nTemp = this.GetBestSameCount(bmpChar, v);
if (nTemp > nSameCount)
{
nSameCount = nTemp; chCode = v;
}
}
}
}
return(chCode);
}