Winform中实现中文验证码(附代码下载)

雨点打透心脏的1/2处 2023-10-07 05:27 64阅读 0赞

## 场景 ##

中文验证码效果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

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## 实现 ##

新建一个窗体页面，设计布局如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

其中显示验证码的是PictureBox

然后进入窗体代码中修改为

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.Drawing.Imaging;
    using System.Drawing.Drawing2D;
    namespace ChineseCode
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
            public string txt = "";
            private void Form1_Load(object sender, EventArgs e)
            {
                CreateImage();
            }
            private void CreateImage()
            {
                //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 = CreateCode(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[])));
                txt = str1 + str2 + str3 + str4;
                if (txt == null || txt == String.Empty)
                {
                    return;
                }
                Bitmap image = new Bitmap((int)Math.Ceiling((txt.Length * 20.5)), 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 < 2; i++)
                    {
                        Point tem_Point_1 = new Point(random.Next(image.Width), random.Next(image.Height));
                        Point tem_Point_2 = new Point(random.Next(image.Width), random.Next(image.Height));
                        g.DrawLine(new Pen(Color.Black), tem_Point_1, tem_Point_2);
                    }
                    Font font = new Font("宋体", 12, (FontStyle.Bold));
                    LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
                    g.DrawString(txt, font, brush, 2, 2);
                    //画图片的前景噪音点
                    for (int i = 0; i < 100; i++)
                    {
                        Point tem_point = new Point(random.Next(image.Width),random.Next(image.Height));
                        image.SetPixel(tem_point.X,tem_point.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);
                    pictureBox1.Image = image;
                }
                catch { }
            }
    
            /**/
            /*
            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
            */
            public static object[] CreateCode(int strlength)
            {
                //定义一个字符串数组储存汉字编码的组成元素
                string[] r=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 = r[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 = r[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 = r[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 = r[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;
           }
    
            private void button2_Click(object sender, EventArgs e)
            {
                CreateImage();
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                if (txtCode.Text.Trim() == "")
                    return;
                else
                {
                    if (txtCode.Text.Trim() == txt)
                    {
                        MessageBox.Show("提示：验证码输入正确！","提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
                    }
                    else
                    {
                        MessageBox.Show("提示：验证码输入错误，请重新输入！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                }
            }
        }
    }

### 代码下载 ###

[https://download.csdn.net/download/BADAO\_LIUMANG\_QIZHI/12243420][https_download.csdn.net_download_BADAO_LIUMANG_QIZHI_12243420]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200312131000951.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200312131006158.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[https_download.csdn.net_download_BADAO_LIUMANG_QIZHI_12243420]: https://download.csdn.net/download/BADAO_LIUMANG_QIZHI/12243420