[align=center][/align]
效果如下:
--->
代码如下:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace 验证码 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }
//生成随机汉字验证码 private void button1_Click(object sender, EventArgs e) { this.button1.BackColor = AttionColor (); this.button1.ForeColor = Color.Red; Random r=new Random(); //获取GB2312编码页(表) Encoding gb = Encoding.GetEncoding("gb2312"); //调用函数产生4个随机中文汉字编码 object[] bytes = CreateRegionCode(4); //根据汉字编码的字节数组解码出中文汉字 string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[]))); string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[]))); string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[]))); string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[]))); this.button1.Text = str1 + str2 + str3 + str4;
} /**/ /* 此函数在汉字编码范围内随机创建含两个元素的十六进制字节数组,每个字节数组代表一个汉字,并将 四个字节数组存储在object数组中。 参数:strlength,代表需要产生的汉字个数 */
//生成随机汉字验证码方法 public static object[] CreateRegionCode(int strlength) { //定义一个字符串数组储存汉字编码的组成元素 string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; Random rnd = new Random(); //定义一个object数组用来 object[] bytes = new object[strlength]; /**/ /*每循环一次产生一个含两个元素的十六进制字节数组,并将其放入bject数组中 每个汉字有四个区位码组成 区位码第1位和区位码第2位作为字节数组第一个元素 区位码第3位和区位码第4位作为字节数组第二个元素 */ for (int i = 0; i < strlength; i++) { //区位码第1位 int r1 = rnd.Next(11, 14); string str_r1 = rBase[r1].Trim(); //区位码第2位 rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的 //种子避免产生重复值 int r2; if (r1 == 13) { r2 = rnd.Next(0, 7); } else { r2 = rnd.Next(0, 16); } string str_r2 = rBase[r2].Trim(); //区位码第3位 rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i); int r3 = rnd.Next(10, 16); string str_r3 = rBase[r3].Trim(); //区位码第4位 rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i); int r4; if (r3 == 10) { r4 = rnd.Next(1, 16); } else if (r3 == 15) { r4 = rnd.Next(0, 15); } else { r4 = rnd.Next(0, 16); } string str_r4 = rBase[r4].Trim(); //定义两个字节变量存储产生的随机汉字区位码 byte byte1 = Convert.ToByte(str_r1 + str_r2, 16); byte byte2 = Convert.ToByte(str_r3 + str_r4, 16); //将两个字节变量存储在字节数组中 byte[] str_r = new byte[] { byte1, byte2 }; //将产生的一个汉字的字节数组放入object数组中 bytes.SetValue(str_r, i); } return bytes; }
//验证码输入正确! private void button2_Click(object sender, EventArgs e) { if (this.textBox1.Text == this.button1.Text || this .textBox1 .Text ==this.button3.Text ) MessageBox.Show("验证码输入正确!"); }
//随机生成颜色 public Color AttionColor() { Color color = new Color(); Random random = new Random(); color = Color.FromArgb(255, random.Next(255), random.Next(255), random.Next(255)); // MessageBox.Show(color .ToArgb ().ToString ()); return color; }
//点击随机生成数字或字母 private void button3_Click(object sender, EventArgs e) { this.button3.Text = CreateValidate(5);//生成几个随机数 this.button3.ForeColor = AttionColor(); }
//生成0-9 A-Z 的随机数 private string CreateValidate(int count) { string allChar = "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"; string[] allCharArray = allChar.Split(','); string randomCode = ""; int temp = -1; Random rand = new Random(); for (int i = 0; i < count; i++) { if (temp != -1) { rand = new Random(i * temp * ((int)DateTime.Now.Ticks)); } int t = rand.Next(35); if (temp == t) { return CreateValidate(count); } temp = t; randomCode += allCharArray[t]; }
return randomCode; }
//大小写字母转换 private void button4_Click(object sender, EventArgs e) { string inputStr = this.textBox1 .Text ; char[] outputStr = new char[inputStr.Length]; string s = string.Empty; for (int i = 0; i < textBox1.Text.Length; i++) { if (inputStr >= 'a' && inputStr <= 'z') outputStr = (char)(inputStr - ('a' - 'A')); if (inputStr >= 'A' && inputStr <= 'Z') outputStr = (char)(inputStr + ('a' - 'A')); } for (int i = 0; i < outputStr.Length; i++) { s = s + outputStr.ToString(); } this.button4.Text = s; } } }
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