(visual studio) 在form窗体上面,怎么实现验证码功能
2个回答
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下面是关键代码,另有附件,不懂可以追问
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace VerifyCodeDemo
{
public partial class Form1 : Form
{
private string VerifyCode = "";
public Form1()
{
InitializeComponent();
VerifyCode = MakeCode(5);
pictureBox1.Image = CreateCodeImg(VerifyCode);
}
/// <summary>
/// 生成验证码字符串
/// </summary>
/// <param name="codeLen">验证码字符长度</param>
/// <returns>返回验证码字符串</returns>
private string MakeCode(int codeLen)
{
if (codeLen < 1)
{
return string.Empty;
}
int number;
string checkCode = string.Empty;
Random random = new Random();
for (int index = 0; index < codeLen; index++) {
number = random.Next();
if (number % 2 == 0) {
checkCode += (char)('0' + (char)(number % 10)); //生成数字
} else {
checkCode += (char)('A' + (char)(number % 26)); //生成字母
}
}
return checkCode;
}
///<summary>
/// 获取验证码图片流
/// </summary>
/// <param name="checkCode">验证码字符串</param>
/// <returns>返回验证码图片流</returns>
private Image CreateCodeImg(string checkCode)
{
if (string.IsNullOrEmpty(checkCode)) {
return null;
}
Bitmap image = new Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics graphic = Graphics.FromImage(image);
try {
Random random = new Random();
graphic.Clear(Color.White);
int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
for (int index = 0; index < 25; index++) {
x1 = random.Next(image.Width);
x2 = random.Next(image.Width);
y1 = random.Next(image.Height);
y2 = random.Next(image.Height);
graphic.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new Font("Arial", 12, (FontStyle.Bold |FontStyle.Italic));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Red, Color.DarkRed, 1.2f, true);
graphic.DrawString(checkCode, font, brush, 2, 2);
int x = 0;
int y = 0;
//画图片的前景噪音点
for(int i=0; i<100; i++) {
x = random.Next(image.Width);
y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
graphic.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
return image;
} finally {
graphic.Dispose();
}
}
private void pictureBox1_Click(object sender, EventArgs e)
{
VerifyCode = MakeCode(5);
pictureBox1.Image = CreateCodeImg(VerifyCode);
}
private void btnOK_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(txtVerifyCode.Text)) {
MessageBox.Show("输入验证码");
return;
}
if (txtVerifyCode.Text.Equals(VerifyCode, StringComparison.OrdinalIgnoreCase)) {
MessageBox.Show("OK!");
} else {
MessageBox.Show("验证码错误!");
}
}
}
}
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