110,532
社区成员
发帖
与我相关
我的任务
分享
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.Drawing2D;
namespace 验证码
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public string txt = "";
private void Form1_Load(object sender, EventArgs e)
{
CreateImage();
}
private void CreateImage()
{
string[] r = new String[62]{ "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"};
Random x = new Random();
string str1 = r[x.Next(0, 62)], str2 =r[x.Next(0, 62)], str3 =r[x.Next(0, 62)], str4 =r[x.Next(0, 62)];
txt = str1 + str2 + str3 + str4;
if (txt == null || txt == String.Empty)
{
return;
}
Bitmap image = new Bitmap((int)Math.Ceiling((txt.Length*15.0)), 20);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色以白色填充
g.Clear(Color.White);
//画图片的背景噪音线
for (int i = 0; i < 3; 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("Arial", 12, (FontStyle.Bold));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Pink , Color.Red, 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 (Exception e)
{
MessageBox.Show(e.Message);
}
}
private void button2_Click(object sender, EventArgs e)
{
CreateImage();
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text.Trim() =="")
{
return;
}
else
{
if (textBox1.Text.Trim().ToLower() == txt.ToLower())
{
MessageBox.Show("提示: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);
}
}
}
}
}
SizeF size = g.MeasureString(txt, font);
g.DrawString(txt, font, brush, (image.Width-size.Width)/2, (image.Height-size.Height)/2);