vb.net2005 vbnet2005入门经典PDF

vb.net2005文件操作'Windowsvb.net2005的搜索用vb.net2005了18秒vb.net2005,本程序用vb.net2005了20秒
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
GetDirectFiles("D:\")
End Sub
Private Sub GetDirectFiles(ByVal s As String)
'找出位于 s 根目录下vb.net2005的所有文件
Try
Dim f() As String, t As Collections.ObjectModel.ReadOnlyCollection(Of String) = My.Computer.FileSystem.GetFiles(s), k As String
Me.Text = s
For Each k In My.Computer.FileSystem.GetDirectories(s)
GetDirectFiles(k)
Next
ReDim f(t.Count - 1)
t.CopyTo(f, 0)
ListBox1.Items.AddRange(f)
Catch
End Try
End Sub
VB.NET 2005和2010有什么不同2010多了AJAX控件,自动配置了JQuery文件,可以使用LINQ和多了很多新特性,2005的教材书可以用在vb2010上,因为语言是一样的
VB.NET2005代码问题意思是说vb.net2005你的函数有可能不返回值vb.net2005,问题出在Try语句里面 。如果Try语句没有捕获到异常,Return语句就会正常返回值;如果捕获到异常 , 就会直接跳进Catch语句块里 , 在这种情况下 , 函数运行完之前一直没有返回值 。你可以直接把这个异常丢给调用方,在End Try上面写:
Throw ex
在End Function上方写:
Return Nothing
这样你就可以让调用者来捕获异常,或者直接把Try语句里面的代码拿出来 , 去掉Try语句,也可以起到类似的作用 。
VB.NET 2005编写定时关机程序 最近在网上搜索vb.net2005了一些关于实现关机 重启 注销的文章 发现大多介绍的是VB NET 用API实现这些功能 且在XPsp 环境下无法正常的关机与注销 而对于VB NET 的介绍几乎没有 本文章所涉及的知识点有
用实现关机 重启 注销功能 通过使用textbox与timer控件的结合编写定时器功能 为vb.net2005你的程序加上超链接
本篇文章具有一定的基础性和广泛的实用性 相信能够给 初学者带来一定的帮助
本文所使用的编程环境是Microsoft Visual Studio 首先打开 Visual Studio 在文件 (File) 菜单上 单击新建项目 (New Project) 在新建项目 (New Project) 对话框的模板 (Templates) 窗格中 单击 Windows 应用程序 (Windows Application) 单击确定 (OK)
具体步骤如下
首先在Form 窗体上添加一个Label 控件属性text设置为:今天: 然后分别添加 个button控件name分别为button button button 它们的text属性分别为 关闭计算机(启动定时器) 注销 重新启动

现在vb.net2005我们就需要为程序加上一个定时器了 这个定时器需要与textbox 控件相关联 输入正确时间格式后就可以启动定时功能了 然后vb.net2005我们需要在窗体上添加一个timer 一个textbox 控件 和一个RadioButton 控件 让它们保留默认值不变 其中 TextBox 控件的text属性设置为 : : RadioButton 控件text设置为 指定时间关机|时间格式 小时: 分钟: 秒如图 所示

以上界面工作基本完成现在需要输入代码了
双击窗体进入常规 声明Public Class Form 事件中
CODE
Imports System Runtime InteropServicesImports Microsoft VisualBasicPublic Class Form_ 调用系统参数Friend Shared Function GetCurrentProcess() As IntPtrEnd Function
_Friend Shared Function OpenProcessToken(ByVal h As IntPtr
ByVal acc As Integer ByRef phtok As IntPtr) As BooleanEnd Function
_Friend Shared Function LookupPrivilegeValue(ByVal host As String
ByVal name As String ByRef pluid As Long) As BooleanEnd Function
_Friend Shared Function AdjustTokenPrivileges(ByVal htok As IntPtr
ByVal disall As Boolean ByRef newst As TokPriv Luid
ByVal len As Integer ByVal prev As IntPtr
ByVal relen As IntPtr) As BooleanEnd Function
_Friend Shared Function ExitWindowsEx(ByVal flg As Integer
ByVal rea As Integer) As BooleanEnd Function
Friend Const SE_PRIVILEGE_ENABLED As Integer = H Friend Const TOKEN_QUERY As Integer = H Friend Const TOKEN_ADJUST_PRIVILEGES As Integer = H Friend Const SE_SHUTDOWN_NAME As String = SeShutdownPrivilege Friend Const EWX_LOGOFF As Integer = H 注销计算机Friend Const EWX_SHUTDOWN As Integer = H 关闭计算机Friend Const EWX_REBOOT As Integer = H 重新启动计算机Friend Const EWX_FORCE As Integer = H 关闭所有进程 注销计算机Friend Const EWX_POWEROFF As Integer = H Friend Const EWX_FORCEIFHUNG As Integer = H
_引用参数 Friend Structure TokPriv Luid Public Count As Integer Public Luid As Long Public Attr As IntegerEnd Structure
Private Shared Sub DoExitWin(ByVal flg As Integer) Dim xc As Boolean 判断语句 Dim tp As TokPriv Luid Dim hproc As IntPtr = GetCurrentProcess()调用进程值 Dim htok As IntPtr = IntPtr Zero xc = OpenProcessToken(hproc TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY htok) tp Count =tp Luid =tp Attr = SE_PRIVILEGE_ENABLED xc = LookupPrivilegeValue(Nothing SE_SHUTDOWN_NAME tp Luid) xc = AdjustTokenPrivileges(htok False tp IntPtr Zero IntPtr Zero) xc = ExitWindowsEx(flg )End Sub
Public Shared Sub Reboot() DoExitWin((EWX_FORCE Or EWX_REBOOT)) 重新启动计算机End Sub
Public Shared Sub PowerOff() DoExitWin((EWX_FORCE Or EWX_POWEROFF)) 关闭计算机End Sub
Public Shared Sub LogoOff() DoExitWin((EWX_FORCE Or EWX_LOGOFF)) 注销计算机End Sub
Dim entTime As Object 保存输入时间Dim xianzaiTime As Object 保存实时时间Dim startTime As Object 保存开始定时时间
注销button 按钮输入code
Private Sub Button _Click(ByVal sender As System Object
ByVal e As System EventArgs) Handles Button ClickLogoOff() 注销计算机End Sub
双击重新启动按钮button 输入code
Private Sub Button _Click(ByVal sender As System Object
ByVal e As System EventArgs) Handles Button Click
Reboot()
End Sub
双击关闭计算机按钮button 输入code
Private Sub Button _Click(ByVal sender As System Object
ByVal e As System EventArgs) Handles Button Click startTime = TimeOfDay If Not IsDate(TextBox Text) Then 用IsData函数判断输入的时间格式MsgBox( vb.net2005你所输入的不是时间格式 ! 错误 ) ElseentTime = TimeValue(TextBox Text) End If Timer Enabled = True启动定时器 Me WindowState = System Windows Forms FormWindowState Minimized最小化窗体
End Sub
如图

双击timer 控件如图

输入代码
Private Sub Timer _Tick(ByVal sender As System Object
ByVal e As System EventArgs) Handles Timer Tick xianzaiTime = TimeOfDay If RadioButton Checked Then
If DateDiff(Microsoft VisualBasic DateInterval Second
xianzaiTime entTime)Then 用DateDiff函数判断是否到时间了
End IfEnd If
PowerOff() 关闭计算机End Sub
好了 基本上一个定时关机程序就完成了 接下来加一个超级链接吧!当然对于高手来说可能是废话 但是对于新手来说这也是必备的 这个超级链接当然是我们最喜欢的天极网开发频道了
先创建一个Label控件吧 把它托到窗体上 将text属性设置为天极网开发频道如图

接下来需要输入代码了 双击窗体Form
进入Public Class Form 事件
代码
Private Declare Function ShellExecute Lib shell dll
Alias ShellExecuteA (ByVal hwngnd As Integer
ByVal lpOperation As String ByVal lpFile As String
ByVal lpParameters As String ByVal lpDirectory As String
ByVal nShowCmd As Integer) As Integer
如图

双击刚才添加的label属性text:(天极网开发频道)中输入以下代码
Private Sub Label _Click(ByVal sender As System Object
ByVal e As System EventArgs) Handles Label ClickShellExecute( open CStr( ) CStr( ) )
End SubEnd Class
OK!全部搞定 按F 键运行如图 所示 选择相应选项后点击(关闭计算机启动定时器按钮)就可以了 现在程序将按照你所设定的时间而启动关闭计算机选项
lishixinzhi/Article/program/net/201311/12366
VB.net2005中到底怎么读取ini文件用API吧
Private Declare Function GetPrivateProfileString Lib "kernel32" Alias "GetPrivateProfileStringA" (ByVal lpApplicationName As String, ByVal lpKeyName As String, ByVal lpDefault As String, ByVal lpReturnedString As String, ByVal nSize As Int32, ByVal lpFileName As String) As Int32
Private Declare Function WritePrivateProfileString Lib "kernel32" Alias "WritePrivateProfileStringA" (ByVal lpApplicationName As String, ByVal lpKeyName As String, ByVal lpString As String, ByVal lpFileName As String) As Int32
'读
Public Function GetINI(ByVal Section As String, ByVal AppName As String, ByVal lpDefault As String, ByVal FileName As String) As String
Dim Str As String = LSet(Str, 256)
GetPrivateProfileString(Section, AppName, lpDefault, Str, Len(Str), FileName)
Return Microsoft.VisualBasic.Left(Str, InStr(Str, Chr(0)) - 1)
End Function
'写
Public Function WriteINI(ByVal Section As String, ByVal AppName As String, ByVal WriteString As String, ByVal FileName As String) As Long
WriteINI = WritePrivateProfileString(Section, AppName, WriteString, FileName)
End Function
其中vb.net2005,Section是像[ip]那样vb.net2005的(填里面的就可以了)vb.net2005,AppName是“=”前面的项名称vb.net2005,lpDefault是如果没有可用的值,就返回lpDefault,FileName是文件名 , WriteString是要写入的值
vb.net2005你所希望的:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
MsgBox(GetINI("ip", "user_id", "", "D:\DataBase.ini"))
'返回sa
End Sub
VB.NET2005连接数据库做登录界面出错,变量MsgText在赋值前被使用,可能会在运行时导致空引用 , 高手来!可以不用管它,因为默认值是空,想不出现警告就定义成:dim MsgText as string=""
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