微软C#生成验证码图片实战代码

发布时间:2024年01月12日
/// <summary>
/// 生成验证码图片
/// </summary>
public void CreateCheckCodeImage()
{
    #region
    string checkCode = GenerateCheckCode();
    if (checkCode == null || checkCode.Trim() == String.Empty)
        return;

    System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
    Graphics g = Graphics.FromImage(image);

    try
    {
        //生成随机生成器
        Random random = new Random();

        //清空图片背景色
        g.Clear(Color.White);

        //画图片的背景噪音线
        for (int i = 0; i < 25; i++)
        {
            int x1 = random.Next(image.Width);
            int x2 = random.Next(image.Width);
            int y1 = random.Next(image.Height);
            int y2 = random.Next(image.Height);

            g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
        }

        Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
        System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
        g.DrawString(checkCode, font, brush, 2, 2);

        //画图片的前景噪音点
        for (int i = 0; i < 150; i++)
        {
            int x = random.Next(image.Width);
            int y = random.Next(image.Height);

            image.SetPixel(x, y, Color.FromArgb(random.Next()));
        }

        //画图片的边框线
        g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
        HttpContext.Current.Response.ClearContent();
        HttpContext.Current.Response.ContentType = "image/Gif";
        HttpContext.Current.Response.BinaryWrite(ms.ToArray());
    }
    finally
    {
        g.Dispose();
        image.Dispose();
    }
    #endregion
}
 /// <summary>
 /// 生成随机数
 /// </summary>
 /// <returns></returns>
 public static string GenerateCheckCode()
 {
     #region
     int number;
     char code;
     string checkCode = String.Empty;

     System.Random random = new Random();

     for (int i = 0; i < 5; i++)
     {
         number = random.Next();

         if (number % 2 == 0)
             code = (char)('0' + (char)(number % 10));
         else
             code = (char)('A' + (char)(number % 26));

         checkCode += code.ToString();
     }

     HttpContext.Current.Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));

     return checkCode;
     #endregion
 }
  #region 生成指定位数随机数
 private static char[] constant =
   {
     '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'
   };

 public static string GenerateRandom(int Length)
 {
     System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62);
     Random rd = new Random();
     for (int i = 0; i < Length; i++)
     {
         newRandom.Append(constant[rd.Next(62)]);
     }
     return newRandom.ToString();
 }

 public static string GetNumRandom(int Length)
 {

     System.Text.StringBuilder newRandom = new System.Text.StringBuilder(10);
     char[] NumStr = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
     Random rd = new Random();
     for (int i = 0; i < Length; i++)
     {
         newRandom.Append(constant[rd.Next(10)]);
     }
     return newRandom.ToString();
 }

 #endregion

 /// <summary>
/// 获取汉字第一个拼音
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string getSpells(string input)
{
    #region
    int len = input.Length;
    string reVal = "";
    for (int i = 0; i < len; i++)
    {
        reVal += getSpell(input.Substring(i, 1));
    }
    return reVal;
    #endregion
}

public static string getSpell(string cn)
{
    #region
    byte[] arrCN = Encoding.Default.GetBytes(cn);
    if (arrCN.Length > 1)
    {
        int area = (short)arrCN[0];
        int pos = (short)arrCN[1];
        int code = (area << 8) + pos;
        int[] areacode = { 45217, 45253, 45761, 46318, 46826, 47010, 47297, 47614, 48119, 48119, 49062, 49324, 49896, 50371, 50614, 50622, 50906, 51387, 51446, 52218, 52698, 52698, 52698, 52980, 53689, 54481 };
        for (int i = 0; i < 26; i++)
        {
            int max = 55290;
            if (i != 25) max = areacode[i + 1];
            if (areacode[i] <= code && code < max)
            {
                return Encoding.Default.GetString(new byte[] { (byte)(65 + i) });
            }
        }
        return "?";
    }
    else return cn;
    #endregion
}


/// <summary>
/// 半角转全角
/// </summary>
/// <param name="BJstr"></param>
/// <returns></returns>
public static string GetQuanJiao(string BJstr)
{
    #region
    char[] c = BJstr.ToCharArray();
    for (int i = 0; i < c.Length; i++)
    {
        byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);
        if (b.Length == 2)
        {
            if (b[1] == 0)
            {
                b[0] = (byte)(b[0] - 32);
                b[1] = 255;
                c[i] = System.Text.Encoding.Unicode.GetChars(b)[0];
            }
        }
    }

    string strNew = new string(c);
    return strNew;

    #endregion
}

/// <summary>
/// 全角转半角
/// </summary>
/// <param name="QJstr"></param>
/// <returns></returns>
public static string GetBanJiao(string QJstr)
{
    #region
    char[] c = QJstr.ToCharArray();
    for (int i = 0; i < c.Length; i++)
    {
        byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);
        if (b.Length == 2)
        {
            if (b[1] == 255)
            {
                b[0] = (byte)(b[0] + 32);
                b[1] = 0;
                c[i] = System.Text.Encoding.Unicode.GetChars(b)[0];
            }
        }
    }
    string strNew = new string(c);
    return strNew;
    #endregion
}
文章来源:https://blog.csdn.net/leidong2009/article/details/135523849
本文来自互联网用户投稿,该文观点仅代表作者本人,不代表本站立场。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。