/// <summary>
/// 显示验证码
/// </summary>
/// <param name="seed">随机数辅助种子</param>
/// <param name="strLen">验证码字符长度</param>
/// <param name="fontSize">字体大小</param>
/// <param name="mode">随机字符模式</param>
/// <param name="clrBg">背景颜色</param>
public Bitmap ShowValidationCode(int seed, int strLen, int fontSize, RandomStringMode mode, Color clrBg)
{
Random rnd = new Random(seed);
currtext = GenerateRandomString(strLen, mode);
int height = 35;
int width = 25 * currtext.Length;
Bitmap bmp = new Bitmap(width, height);
String fontName = "微软雅黑";
Graphics graphics = Graphics.FromImage(bmp);
Font font = null;//Courier New
int findex = rnd.Next(Fonts.Length - 1);
Brush brush = new SolidBrush(Colors[findex]);
Brush brushBg = new SolidBrush(clrBg);
Brush brushDd = new SolidBrush(Color.Transparent);
graphics.FillRectangle(brushBg, 0, 0, width, height);
Bitmap tmpBmp = null;
Graphics tmpGph = null;
int degree = 40;
Point tmpPoint = new Point();
for (int i = 0; i < currtext.Length; i++)
{
tmpBmp = new Bitmap(35, 55);
tmpGph = Graphics.FromImage(tmpBmp);
tmpGph.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
tmpGph.FillRectangle(brushDd, 0, 0, 35, 55);
//填充透明色
//tmpGph.Clear(Color.Transparent);
degree = rnd.Next(5, 20); // [20, 50]随机角度
if (rnd.Next(0, 2) == 0)
{
tmpPoint.X = 4; // 调整文本坐标以适应旋转后的图象
tmpPoint.Y = -2;
}
else
{
degree = ~degree + 1; // 逆时针旋转
tmpPoint.X = -4;
tmpPoint.Y = 2;
}
tmpGph.RotateTransform(degree);
font = new Font(fontName, rnd.Next(fontSize - 3, fontSize), FontStyle.Regular);
tmpGph.DrawString(currtext[i].ToString(), font, brush, tmpPoint);
graphics.DrawImage(tmpBmp, 10 + i * 11, 0); // 拼接图象
}
//释放资源
font.Dispose();
brush.Dispose();
brushBg.Dispose();
tmpGph.Dispose();
graphics.Dispose();
tmpBmp.Dispose();
return(bmp);
}
private static string GenerateRandomString(int length, RandomStringMode mode)
{
string rndStr = string.Empty;
if (length == 0)
{
return(rndStr);
}
int[] range = new int[2] {
0, 0
};
switch (mode)
{
case RandomStringMode.Digital:
for (int i = 0; i < length; ++i)
{
rndStr += digitals[rand.Next(0, digitals.Length)];
}
break;
case RandomStringMode.LowerLetter:
for (int i = 0; i < length; ++i)
{
rndStr += lowerLetters[rand.Next(0, lowerLetters.Length)];
}
break;
case RandomStringMode.UpperLetter:
for (int i = 0; i < length; ++i)
{
rndStr += upperLetters[rand.Next(0, upperLetters.Length)];
}
break;
case RandomStringMode.Letter:
for (int i = 0; i < length; ++i)
{
rndStr += letters[rand.Next(0, letters.Length)];
}
break;
default:
for (int i = 0; i < length; ++i)
{
rndStr += mix[rand.Next(0, mix.Length)];
}
break;
}
return(rndStr);
}
public static string GenerateRandomString(RandomStringMode mode, int minLength, int maxLength)
{
StringBuilder retVal = new StringBuilder();
int stringLen = Rand.Next(minLength, maxLength);
int asciiBase = -1;
int sizeOfGenerationSpace = -1;
int randomNum = -1;
for (int i = 0; i < stringLen; i++)
{
// 48-57: 0-9, 65-90: A-Z, 97-122: a-z
switch (mode)
{
case RandomStringMode.Numeric:
asciiBase = 48;
sizeOfGenerationSpace = 10;
retVal.Append((char)Rand.Next(asciiBase, asciiBase + sizeOfGenerationSpace));
break;
case RandomStringMode.AlphaLowerCase:
asciiBase = 97;
sizeOfGenerationSpace = 26;
retVal.Append((char)Rand.Next(asciiBase, asciiBase + sizeOfGenerationSpace));
break;
case RandomStringMode.AlphaLowerCaseUpperCase:
asciiBase = 65;
sizeOfGenerationSpace = 52;
randomNum = Rand.Next(asciiBase, asciiBase + sizeOfGenerationSpace);
if (randomNum > 90)
{
randomNum += 6;
}
retVal.Append((char)randomNum);
break;
case RandomStringMode.AlphaNumericLowerCase:
asciiBase = 48;
sizeOfGenerationSpace = 36;
randomNum = Rand.Next(asciiBase, asciiBase + sizeOfGenerationSpace);
if (randomNum > 57)
{
randomNum += 39;
}
retVal.Append((char)randomNum);
break;
case RandomStringMode.AlphaNumericLowerCaseUpperCase:
asciiBase = 48;
sizeOfGenerationSpace = 62;
randomNum = Rand.Next(asciiBase, asciiBase + sizeOfGenerationSpace);
if (randomNum <= 57)
{
// do not rebase the number in this case
}
else if (randomNum > 57 && randomNum < 84)
{
randomNum += 7;
}
else
{
randomNum += 13;
}
retVal.Append((char)randomNum);
break;
default:
throw new ArgumentException("Invalid RandomStringMode specified");
}
}
return(retVal.ToString());
}
public static string GenerateRandomString(RandomStringMode mode, int length)
{
return(GenerateRandomString(mode, length, length));
}
public string GenerateRandomString(int length, RandomStringMode mode)
{
string rndStr = string.Empty;
if (length == 0)
{
return(rndStr);
}
//以数组方式候选字符，可以更方便的剔除不要的字符，如数字 0 与字母 o
char[] digitals = new char[10] {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
};
char[] lowerLetters = new char[26] {
'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y', 'z'
};
char[] upperLetters = new char[26] {
'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z'
};
char[] letters = new char[52] {
'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z'
};
char[] mix = new char[62] {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z'
};
int[] range = new int[2] {
0, 0
};
Random random = new Random();
switch (mode)
{
case RandomStringMode.Digital:
for (int i = 0; i < length; ++i)
{
rndStr += digitals[random.Next(0, digitals.Length)];
}
break;
case RandomStringMode.LowerLetter:
for (int i = 0; i < length; ++i)
{
rndStr += lowerLetters[random.Next(0, lowerLetters.Length)];
}
break;
case RandomStringMode.UpperLetter:
for (int i = 0; i < length; ++i)
{
rndStr += upperLetters[random.Next(0, upperLetters.Length)];
}
break;
case RandomStringMode.Letter:
for (int i = 0; i < length; ++i)
{
rndStr += letters[random.Next(0, letters.Length)];
}
break;
default:
for (int i = 0; i < length; ++i)
{
rndStr += mix[random.Next(0, mix.Length)];
}
break;
}
return(rndStr);
}
private static string GenerateRandomString(int length, RandomStringMode mode)
{
string rndStr = string.Empty;
if (length == 0)
return rndStr;
int[] range = new int[2] { 0, 0 };
switch (mode)
{
case RandomStringMode.Digital:
for (int i = 0; i < length; ++i)
rndStr += digitals[rand.Next(0, digitals.Length)];
break;
case RandomStringMode.LowerLetter:
for (int i = 0; i < length; ++i)
rndStr += lowerLetters[rand.Next(0, lowerLetters.Length)];
break;
case RandomStringMode.UpperLetter:
for (int i = 0; i < length; ++i)
rndStr += upperLetters[rand.Next(0, upperLetters.Length)];
break;
case RandomStringMode.Letter:
for (int i = 0; i < length; ++i)
rndStr += letters[rand.Next(0, letters.Length)];
break;
default:
for (int i = 0; i < length; ++i)
rndStr += mix[rand.Next(0, mix.Length)];
break;
}
return rndStr;
}
/// <summary>
/// 显示验证码
/// </summary>
/// <param name="seed">随机数辅助种子</param>
/// <param name="strLen">验证码字符长度</param>
/// <param name="fontSize">字体大小</param>
/// <param name="mode">随机字符模式</param>
/// <param name="clrBg">背景颜色</param>
public Bitmap ShowValidationCode(int seed, int strLen, int fontSize, RandomStringMode mode, Color clrBg)
{
Random rnd = new Random(seed);
currtext = GenerateRandomString(strLen, mode);
int height = 35;
int width = 25 * currtext.Length;
Bitmap bmp = new Bitmap(width, height);
String fontName = "微软雅黑";
Graphics graphics = Graphics.FromImage(bmp);
Font font = null;//Courier New
int findex = rnd.Next(Fonts.Length - 1);
Brush brush = new SolidBrush(Colors[findex]);
Brush brushBg = new SolidBrush(clrBg);
Brush brushDd = new SolidBrush(Color.Transparent);
graphics.FillRectangle(brushBg, 0, 0, width, height);
Bitmap tmpBmp = null;
Graphics tmpGph = null;
int degree = 40;
Point tmpPoint = new Point();
for (int i = 0; i < currtext.Length; i++)
{
tmpBmp = new Bitmap(35, 55);
tmpGph = Graphics.FromImage(tmpBmp);
tmpGph.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
tmpGph.FillRectangle(brushDd, 0, 0, 35, 55);
//填充透明色
//tmpGph.Clear(Color.Transparent);
degree = rnd.Next(5, 20); // [20, 50]随机角度
if (rnd.Next(0, 2) == 0)
{
tmpPoint.X = 4; // 调整文本坐标以适应旋转后的图象
tmpPoint.Y = -2;
}
else
{
degree = ~degree + 1; // 逆时针旋转
tmpPoint.X = -4;
tmpPoint.Y = 2;
}
tmpGph.RotateTransform(degree);
font = new Font(fontName, rnd.Next(fontSize - 3, fontSize), FontStyle.Regular);
tmpGph.DrawString(currtext[i].ToString(), font, brush, tmpPoint);
graphics.DrawImage(tmpBmp, 10 + i * 11, 0); // 拼接图象
}
//释放资源
font.Dispose();
brush.Dispose();
brushBg.Dispose();
tmpGph.Dispose();
graphics.Dispose();
tmpBmp.Dispose();
return bmp;
}
public string GenerateRandomString(int length, RandomStringMode mode)
{
string rndStr = string.Empty;
if (length == 0)
return rndStr;
//以数组方式候选字符，可以更方便的剔除不要的字符，如数字 0 与字母 o
char[] digitals = new char[10] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
char[] lowerLetters = new char[26] {
'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y', 'z' };
char[] upperLetters = new char[26] {
'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z' };
char[] letters = new char[52]{
'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z' };
char[] mix = new char[62]{
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z' };
int[] range = new int[2] { 0, 0 };
Random random = new Random();
switch (mode)
{
case RandomStringMode.Digital:
for (int i = 0; i < length; ++i)
rndStr += digitals[random.Next(0, digitals.Length)];
break;
case RandomStringMode.LowerLetter:
for (int i = 0; i < length; ++i)
rndStr += lowerLetters[random.Next(0, lowerLetters.Length)];
break;
case RandomStringMode.UpperLetter:
for (int i = 0; i < length; ++i)
rndStr += upperLetters[random.Next(0, upperLetters.Length)];
break;
case RandomStringMode.Letter:
for (int i = 0; i < length; ++i)
rndStr += letters[random.Next(0, letters.Length)];
break;
default:
for (int i = 0; i < length; ++i)
rndStr += mix[random.Next(0, mix.Length)];
break;
}
return rndStr;
}