开发者

C#实现中文验证码的示例代码

目录
  • 实践过程
    • 效果
    • 代码

实践过程

效果

C#实现中文验证码的示例代码

代码

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)Ma编程th.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 pythonFont("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);
            }
        }
    } 
}
partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源,为 true;否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing &amjsp开发者_JS培训;& (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
            this.label1 = new System.Windows.Forms.Label(php);
            this.txtCode = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
            this.SuspendLayout();
            // 
            // pictureBox1
            // 
            this.pictureBox1.Location = new System.Drawing.Point(192, 18);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(76, 21);
            this.pictureBox1.TabIndex = 0;
            this.pictureBox1.TabStop = false;
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(13, 22);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(77, 12);
            this.label1.TabIndex = 1;
            this.label1.Text = "输入验证码:";
            // 
            // txtCode
            // 
            this.txtCode.Location = new System.Drawing.Point(86, 18);
            this.txtCode.Name = "txtCode";
            this.txtCode.Size = new System.Drawing.Size(100, 21);
            this.txtCode.TabIndex = 2;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(62, 58);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 3;
            this.button1.Text = "确定";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(143, 58);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(75, 23);
            this.button2.TabIndex = 4;
            this.button2.Text = "刷新";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(283, 93);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.txtCode);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.pictureBox1);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.Maximiwww.devze.comzeBox = false;
            this.Name = "Form1";
            this.Text = "中文验证码";
            this.Load += new System.EventHandler(this.Form1_Load);
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.PictureBox pictureBox1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.TextBox txtCode;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Button button2;
    }

到此这篇关于C#实现中文验证码的示例代码的文章就介绍到这了,更多相关C# 中文验证码内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们!

0

上一篇:

下一篇:

精彩评论

暂无评论...
验证码 换一张
取 消

最新开发

开发排行榜