08-网络操作/断点续传下载文件/DownLoadFile/Form1.cs

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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.IO;
using System.Net;
using System.Text.RegularExpressions;
using System.Runtime.InteropServices;

namespace DownLoadFile
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        string strName = "";//记录要下载的文件名

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                //监视剪贴板是否有数据
                string strPath = Clipboard.GetData(DataFormats.Text).ToString();
                //验证网址格式
                if (Regex.IsMatch(strPath, @"http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?"))
                {
                    textBox1.Text = strPath;
                    strName = strPath.Substring(strPath.LastIndexOf("/") + 1);
                }
                //读取文件存放的默认路径
                textBox2.Text = ReadString("SysSet", "RootPath", "", Application.StartupPath + "\\SysSet.ini");
                textBox3.Text = strName;
            }
            catch { }
        }

        //下载文件
        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox2.Text.EndsWith("\\"))
                DownloadFile(textBox2.Text + strName, textBox1.Text);
            else
                DownloadFile(textBox2.Text + "\\" + strName, textBox1.Text);
        }

        //选择存放路径，并存储到INI文件中
        private void button4_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.SelectedPath = ReadString("SysSet", "RootPath", "", Application.StartupPath + "\\SysSet.ini");
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                textBox2.Text = folderBrowserDialog1.SelectedPath;
                WritePrivateProfileString("SysSet", "RootPath", folderBrowserDialog1.SelectedPath, Application.StartupPath + "\\SysSet.ini");