我要做一个程序，要求通过USB口读取或者拷贝USB设备中的文件。
请大家不吝赐教！

不明白啊，你那个程序是在哪里运行啊？计算机上么？那你直接把U盘当作一个硬盘不也可以啊，

对是在计算机上运行，不过不会啊
关键是如何读取U盘都有些什么文件啊？
可不可用代码进行说明啊，谢谢了

[[it] 本帖最后由 fjlangzi 于 2008-4-9 16:07 编辑 [/it]]

很像资源管理器哦

我记得前段时间有专门查过这方面的资料，USB设备可以通过一个组件来读取，具体的我回去翻翻资料再告诉你。

找到了……

参考代码如下：

当把U盘放插入，然后程序自动将U盘的内容复制到本地硬盘

using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using

namespace U盘更新
{
    public partial class Form1 : Form
    {
        public const int WM_DEVICECHANGE = 0x219;
        public const int DBT_DEVICEARRIVAL = 0x8000;
        public const int DBT_CONFIGCHANGECANCELED = 0x0019;
        public const int DBT_CONFIGCHANGED = 0x0018;
        public const int DBT_CUSTOMEVENT = 0x8006;
        public const int DBT_DEVICEQUERYREMOVE = 0x8001;
        public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002;
        public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
        public const int DBT_DEVICEREMOVEPENDING = 0x8003;
        public const int DBT_DEVICETYPESPECIFIC = 0x8005;
        public const int DBT_DEVNODES_CHANGED = 0x0007;
        public const int DBT_QUERYCHANGECONFIG = 0x0017;
        public const int DBT_USERDEFINED = 0xFFFF;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
        
        protected override void WndProc(ref Message m)
        {
            try
            {
                if (m.Msg == WM_DEVICECHANGE)
                {
                    switch (m.WParam.ToInt32())
                    {
                        case WM_DEVICECHANGE:
                            break;
                        case DBT_DEVICEARRIVAL://U盘插入
                            DriveInfo[] s = DriveInfo.GetDrives();
                            foreach (DriveInfo drive in s)
                            {
                                if (drive.DriveType == DriveType.Removable)
                                {
                                    listBox1.Items.Add("U盘已插入，盘符为:" + drive.Name.ToString());
                                    break;
                                }
                            }
                            break;
                        case DBT_CONFIGCHANGECANCELED:
                            break;
                        case DBT_CONFIGCHANGED:
                            break;
                        case DBT_CUSTOMEVENT:
                            break;
                        case DBT_DEVICEQUERYREMOVE:
                            break;
                        case DBT_DEVICEQUERYREMOVEFAILED:
                            break;
                        case DBT_DEVICEREMOVECOMPLETE: //U盘卸载
                            break;
                        case DBT_DEVICEREMOVEPENDING:
                            break;
                        case DBT_DEVICETYPESPECIFIC:
                            break;
                        case DBT_DEVNODES_CHANGED:
                            break;
                        case DBT_QUERYCHANGECONFIG:
                            break;
                        case DBT_USERDEFINED:
                            break;
                        default:
                            break;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            base.WndProc(ref m);
        }

using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using

namespace CH1
{
    public partial class CH1_DemoForm010 : Form
    {
        public CH1_DemoForm010()
        {
            InitializeComponent();
        }

        private void CH1_DemoForm010_Load(object sender, EventArgs e)
        {
            DiskDriveComboBox.Items.AddRange(Directory.GetLogicalDrives());
        }

        private void DiskDriveComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (DiskDriveComboBox.SelectedIndex != -1)
            {
                try
                {
                    string[] subdirectoryEntries = Directory.GetDirectories((string)DiskDriveComboBox.SelectedItem);
                    DirectoryListBox.DataSource = subdirectoryEntries;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                    DirectoryListBox.DataSource = null;
                    txtResult.Clear();
                }
            }
        }

        private void DirectoryListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (DirectoryListBox.SelectedIndex != -1)
            {
                // 显示一个状态讯息对话框来表示我们目前要尝试取得所有层级的子目录。
                frmStatus frmStatusMessage = new frmStatus();
                frmStatusMessage.Show("尝试取得所有层级的子目录，处理中，请稍后....");

                // 建立一个对应至使用者所选取之目录的 DirectoryInfo 对象。
                DirectoryInfo theDir = new DirectoryInfo((string)DirectoryListBox.SelectedItem);

                StringBuilder sb = new StringBuilder();

                // 判断目录是否存在。
                if (theDir.Exists)
                {
                    // 显示关于该目录的基本信息。
                    sb.Append("此目录的完整路径是：");
                    sb.Append(theDir.FullName);
                    sb.Append("，它是 ");
                    sb.Append(theDir.Parent.Name);
                    sb.AppendLine(" 的子目录。");

                    sb.Append("根目录：");
                    sb.AppendLine(theDir.Root.Name);

                    sb.Append("属性：");
                    sb.AppendLine(theDir.Attributes.ToString());

                    sb.Append("建立时间：");
                    sb.AppendLine(theDir.CreationTime.ToString());

                    sb.Append("最近一次的访问时间：");
                    sb.AppendLine(theDir.LastAccessTime.ToString());

                    sb.Append("最近一次的写入时间：");
                    sb.AppendLine(theDir.LastWriteTime.ToString());

                    // 以下的程序代码会列出目录的内容。

                    DirectoryInfo[] entries;
                    sb.AppendLine("-------------------------------------------");

                    try
                    {
                        entries = theDir.GetDirectories("*", SearchOption.AllDirectories);
                    }
                    catch
                    {
                        sb.Append("您没有权限来列示此目录。");
                        txtResult.Text = sb.ToString();
                        return;
                    }

                    if (entries.Length > 0)
                    {
                        sb.AppendLine(theDir.FullName + " 之下的所有子目录路径名称");
                        sb.AppendLine("-------------------------------------------");

                        foreach (DirectoryInfo entry in entries)
                        {
                            sb.AppendLine(entry.FullName);
                        }
                    }
                }
                else
                {
                    sb.Append("目录不存在或是您没有权限来查看它。");
                }

                frmStatusMessage.Close();
                txtResult.Text = sb.ToString();
            }
        }
    }
}

这个其实是通过Win32 SDK来实现的，详细的可以再参照win32 sdk来编写。

Good !!

谢谢各位热心的朋友