C#實現驗證碼識別例項

驗證碼例項如下，形同動網論壇所採用的驗證碼:

測試：

System.Net.WebClient _Client =new System.Net.WebClient();
byte[] _ImageBytes =_Client.DownloadData(");

MemoryStream _Memory = new MemoryStream(_ImageBytes);
Bitmap _OldBitmap = (Bitmap)Image.FromStream(_Memory);
pictureBox1.Image = _OldBitmap;
this.Text = GetCodeText(_OldBitmap);

實現程式碼如下：

///

/// 獲取驗證碼
///

/// 圖形
/// 數值
public static string GetCodeText(Bitmap p_Bitmap)
{
int _Width = p_Bitmap.Width / 4;
int _Height = p_Bitmap.Height;

Bitmap[] _Bitmap = new Bitmap[4];
Rectangle _Rectangle = new Rectangle();
_Rectangle.Width = _Width;
_Rectangle.Height = _Height;
for (int i = 0; i != _Bitmap.Length; i++)
{
_Bitmap[i] = p_Bitmap.Clone(_Rectangle, p_Bitmap.PixelFormat);
_Rectangle.X += _Width;
}
int _Value1 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[0]));
int _Value2 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[1]));
int _Value3 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[2]));
int _Value4 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[3]));

string _Value = _Value1 == -1 ? "?" : _Value1.ToString();
_Value += _Value2 == -1 ? "?" : _Value2.ToString();
_Value += _Value3 == -1 ? "?" : _Value3.ToString();
_Value += _Value4 == -1 ? "?" : _Value4.ToString();
return _Value;

}


private static string[] _TextBytes = new string[]
{
"E17BEFBDF7DE7BEFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"FBE3BFFFFEFBEFBFFFFEFB83FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E17BFFFDF7EFDFBF7FFFFE03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E17BFFFDF7E37FFFFDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"EF9FBFFEFAEDBB0FFCFBEF1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"C0FBEFBFFFE07FFFFDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E3F7EFBFFFE273EFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"C07BFFFEFBF7DFBFFFFEFDF7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E17BEFBDF7E17BEFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E17BEFBDF7CE47FFFDF7EFC7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
};


///

/// 獲取二值化資料
///

/// 圖形
/// 二值化資料
public static string GetImageText(Bitmap p_Bitmap)
{
int _Width = p_Bitmap.Width;
int _Height = p_Bitmap.Height;
BitmapData _Data = p_Bitmap.LockBits(new Rectangle(0, 0, _Width, _Height), ImageLockMode.ReadOnly, p_Bitmap.PixelFormat);

byte[] _DataByte = new byte[_Data.Stride * _Height];

Marshal.Copy(_Data.Scan0, _DataByte, 0, _DataByte.Length);

BitArray _Bitarray = new BitArray(_DataByte.Length, true);

int _Index = 0;
for (int i = 0; i != _Height; i++)
{
int _WidthStar = i * _Data.Stride;
for (int z = 0; z != _Width; z++)
{
if (_DataByte[_WidthStar + (z * 3)] == 238 && _DataByte[_WidthStar + (z * 3) + 1] == 238 && _DataByte[_WidthStar + (z * 3) + 2] == 238)
{
_Bitarray[_Index] = true;
}
else
{
_Bitarray[_Index] = false;
}
_Index++;
}
}
p_Bitmap.UnlockBits(_Data);

int _ByteIndex =_Bitarray.Count / 8;
if (_Bitarray.Count % 8 != 0) _ByteIndex++;

byte[] _Temp =new byte[_ByteIndex];
_Bitarray.CopyTo(_Temp, 0);

return BitConverter.ToString(_Temp).Replace("-", "");
}
///

/// 獲取驗證碼
///

/// 圖形
/// 數值
public static string GetCodeText(Bitmap p_Bitmap)
{
int _Width = p_Bitmap.Width / 4;
int _Height = p_Bitmap.Height;

Bitmap[] _Bitmap = new Bitmap[4];
Rectangle _Rectangle = new Rectangle();
_Rectangle.Width = _Width;
_Rectangle.Height = _Height;
for (int i = 0; i != _Bitmap.Length; i++)
{
_Bitmap[i] = p_Bitmap.Clone(_Rectangle, p_Bitmap.PixelFormat);
_Rectangle.X += _Width;
}
int _Value1 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[0]));
int _Value2 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[1]));
int _Value3 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[2]));
int _Value4 = Array.IndexOf(_TextBytes, GetImageText(_Bitmap[3]));

string _Value = _Value1 == -1 ? "?" : _Value1.ToString();
_Value += _Value2 == -1 ? "?" : _Value2.ToString();
_Value += _Value3 == -1 ? "?" : _Value3.ToString();
_Value += _Value4 == -1 ? "?" : _Value4.ToString();
return _Value;

}


private static string[] _TextBytes = new string[]
{
"E17BEFBDF7DE7BEFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"FBE3BFFFFEFBEFBFFFFEFB83FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E17BFFFDF7EFDFBF7FFFFE03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E17BFFFDF7E37FFFFDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"EF9FBFFEFAEDBB0FFCFBEF1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"C0FBEFBFFFE07FFFFDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E3F7EFBFFFE273EFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"C07BFFFEFBF7DFBFFFFEFDF7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E17BEFBDF7E17BEFBDF7DE87FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"E17BEFBDF7CE47FFFDF7EFC7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
};

///

/// 獲取二值化資料
///

/// 圖形
/// 二值化資料
public static string GetImageText(Bitmap p_Bitmap)
{
int _Width = p_Bitmap.Width;
int _Height = p_Bitmap.Height;
BitmapData _Data = p_Bitmap.LockBits(new Rectangle(0, 0, _Width, _Height), ImageLockMode.ReadOnly, p_Bitmap.PixelFormat);

byte[] _DataByte = new byte[_Data.Stride * _Height];

Marshal.Copy(_Data.Scan0, _DataByte, 0, _DataByte.Length);

BitArray _Bitarray = new BitArray(_DataByte.Length, true);

int _Index = 0;
for (int i = 0; i != _Height; i++)
{
int _WidthStar = i * _Data.Stride;
for (int z = 0; z != _Width; z++)
{
if (_DataByte[_WidthStar + (z * 3)] == 238 && _DataByte[_WidthStar + (z * 3) + 1] == 238 && _DataByte[_WidthStar + (z * 3) + 2] == 238)
{
_Bitarray[_Index] = true;
}
else
{
_Bitarray[_Index] = false;
}
_Index++;
}
}
p_Bitmap.UnlockBits(_Data);

int _ByteIndex =_Bitarray.Count / 8;
if (_Bitarray.Count % 8 != 0) _ByteIndex++;

byte[] _Temp =new byte[_ByteIndex];
_Bitarray.CopyTo(_Temp, 0);

return BitConverter.ToString(_Temp).Replace("-", "");
}