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vb.net压缩u盘 vb解压文件
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VB.NET检测插入U盘时执行某段代码，并能获取U盘盘符
以下内容为网络提供,但我自己验证可行,供你参考.
Imports System.IO
Public Class Form1
Public Const WM_DEVICECHANGE = H219
Public Const DBT_DEVICEARRIVAL = H8000
Public Const DBT_CONFIGCHANGECANCELED = H19
Public Const DBT_CONFIGCHANGED = H18
Public Const DBT_CUSTOMEVENT = H8006
Public Const DBT_DEVICEQUERYREMOVE = H8001
Public Const DBT_DEVICEQUERYREMOVEFAILED = H8002
Public Const DBT_DEVICEREMOVECOMPLETE = H8004
Public Const DBT_DEVICEREMOVEPENDING = H8003
Public Const DBT_DEVICETYPESPECIFIC = H8005
Public Const DBT_DEVNODES_CHANGED = H7
Public Const DBT_QUERYCHANGECONFIG = H17
Public Const DBT_USERDEFINED = HFFFF
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
If m.Msg = WM_DEVICECHANGE Then
Select Case m.WParam
Case WM_DEVICECHANGE
Case DBT_DEVICEARRIVAL 'U盘插入
ComboBox1.Items.Clear()
Dim s() As DriveInfo = DriveInfo.GetDrives
For Each drive As DriveInfo In s
If drive.DriveType = DriveType.Removable Then
ListBox1.Items.Add("U盘已插入！盘符为:" + drive.Name.ToString())
ComboBox1.Items.Add(drive.Name)
End If
Next
BtnWrite.Enabled = True
BtnRead.Enabled = True
Case DBT_CONFIGCHANGECANCELED
Case DBT_CONFIGCHANGED
Case DBT_CUSTOMEVENT
Case DBT_DEVICEQUERYREMOVE
Case DBT_DEVICEQUERYREMOVEFAILED
Case DBT_DEVICEREMOVECOMPLETE 'U盘卸载
ListBox1.Items.Add("U盘卸载！")
BtnWrite.Enabled = False
BtnRead.Enabled = False
Case DBT_DEVICEREMOVEPENDING
Case DBT_DEVICETYPESPECIFIC
Case DBT_DEVNODES_CHANGED
Case DBT_QUERYCHANGECONFIG
Case DBT_USERDEFINED
End Select
End If
MyBase.WndProc(m)
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ListBox1.Items.Add("请您现在插入U盘至USB接口！")
End Sub
Private Sub BtnWrite_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnWrite.Click
If ComboBox1.Text = "" Then
MsgBox("请选择U盘盘符！", MsgBoxStyle.Exclamation, "Warn")
Else
Dim Writer As StreamWriter = Nothing
Try
Dim fileName As String = ComboBox1.Text + "Test.txt"
Writer = New StreamWriter(fileName)
Writer.WriteLine(InputBox("老四，请输入要保存的字符串", "输入信息", "Input then Test String! hehe!"))
MsgBox("Write to " + fileName + " Success!")
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Critical, "Write 失败")
Finally
If Writer IsNot Nothing Then Writer.Close()
End Try
End If
End Sub
Private Sub BtnRead_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnRead.Click
If ComboBox1.Text = "" Then
MsgBox("请选择U盘盘符！", MsgBoxStyle.Exclamation, "Warn")
Else
Dim Reader As StreamReader = Nothing
Try
Dim fileName As String = ComboBox1.Text + "Test.txt"
Reader = New StreamReader(fileName)
MsgBox("Read from " + fileName + vbCrLf + Reader.ReadToEnd, MsgBoxStyle.Information, "Info")
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Critical, "Read 失败")
Finally
If Reader IsNot Nothing Then Reader.Close()
End Try
End If
End Sub
End Class
相关问答
Q1: VB.net环境下 不接压直接读取GZ压缩文件内容?能实现吗？
直接读取 一个gz压缩文件：
我直接创建了一个内容："asdfasdfasfd" 的 1.txt文件并用gzip 压缩。
读取：
$ zcat 1.txt.gz
asdfasdfasfd
如果内容过长可以接 less 查看：
$ zcat 1.txt.gz | less
Q2: vb.net进行文件压缩
如果机器安装有winRar软件，就可以通过shell来借用他的功能达到压缩文件的效果；
参考代码如下：
Dim DeliveryF As String = Server.MapPath("..\Temp\DeliveryFactors.xls") '原始文件 (压缩前)
Dim TruckInfo As String = Server.MapPath("..\Temp\TruckInformation.xls")
Dim QDetail As String = Server.MapPath("..\Temp\QuotationDetail.xls")
'用shell命令调用winrar.exe创建压缩文件()
Dim winRarexe As String = "C:\Program Files\WinRAR\Rar" 'winzip 执行文件的位置
Dim wtarget As String = "C:\temp\QuotationVAComparsion.zip" '目地文件 (压缩后)
Dim command As String = winRarexe " a " wtarget " " DeliveryF " " TruckInfo " " QDetail
'这个命令你可以查看winrar的命令集
Dim retval As Double 'Shell 指令传回值
retval = Shell(command, AppWinStyle.MinimizedFocus)
Q3: vb.net编程接受U盘准备卸载用的windows消息 DBT_DEVICEQUERYREMOVE总是没反应，据说是因为默认注册的消息里
在我的XP+VB2010环境下，测试U盘插入拔出，没有问题：
Private WM_DEVICECHANGE As Integer = H219
Public Enum WM_DEVICECHANGE_WPPARAMS As Integer
DBT_CONFIGCHANGECANCELED = H19
DBT_CONFIGCHANGED = H18
DBT_CUSTOMEVENT = H8006
DBT_DEVICEARRIVAL = H8000
DBT_DEVICEQUERYREMOVE = H8001
DBT_DEVICEQUERYREMOVEFAILED = H8002
DBT_DEVICEREMOVECOMPLETE = H8004
DBT_DEVICEREMOVEPENDING = H8003
DBT_DEVICETYPESPECIFIC = H8005
DBT_DEVNODES_CHANGED = H7
DBT_QUERYCHANGECONFIG = H17
DBT_USERDEFINED = HFFFF
End Enum
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
If m.Msg = WM_DEVICECHANGE Then
Select Case m.WParam
Case WM_DEVICECHANGE_WPPARAMS.DBT_DEVICEARRIVAL
MsgBox("USB device is just plugged in!")
Case WM_DEVICECHANGE_WPPARAMS.DBT_DEVICEREMOVECOMPLETE
MsgBox("USB device is just taken out")
End Select
End If
MyBase.WndProc(m)
End Sub
Q4: VB.net 如何将TXT文件转换压缩成.gz文件
手机敲很累的！一定要给分啊！格式是：tar 选项 文件.选项有 -c:产生打包文件 -v:显示详细信息 -f:指定压缩后的文件名 -z:打包同时压缩！举个例子吧！将目录my打包并压缩成my.tar.gz就这样tar -zcvf my.tar.gz my
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