vb.net程序编写 vbnet web编程

VB.NET怎么编模拟袖珍计算器的完整程序？

Public C护激篙刻蕻灸戈熏恭抹lass Form1

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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim c As Char

c = Trim(TextBox3.Text)

Select Case c

Case "+"

TextBox4.Text = Val(TextBox1.Text) + Val(TextBox2.Text)

Case "-"

TextBox4.Text = Val(TextBox1.Text) - Val(TextBox2.Text)

Case "*"

TextBox4.Text = Val(TextBox1.Text) * Val(TextBox2.Text)

Case "\"

If Val(TextBox2.Text) = 0 Then

MsgBox("分母为0")

Else

TextBox4.Text = Val(TextBox1.Text) \ Val(TextBox2.Text)

End If

Case "/"

If Val(TextBox2.Text) = 0 Then

MsgBox("分母为0")

Else

TextBox4.Text = Val(TextBox1.Text) / Val(TextBox2.Text)

End If

End Select

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

End

End Sub

End Class

用VB.NET编写以下程序。

using System;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

Timer tm = new Timer();//实例化 timeer

static int timeS = 0; //设置静态变量记录秒数

TimeSpan ts = new TimeSpan(); //实例化 TimeSpan

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

tm.Interval = 1000; //设置 timeer 1000毫秒执行一次

tm.Tick += new EventHandler(timeer_Tick); //设置 timeer 运行事件

tm.Start(); // 启用 timeer

}

private void timeer_Tick(object sender, EventArgs e)

{

timeS += 1; //秒数 +1

ts = new TimeSpan(0, 0, timeS);

label1.Text = ts.Hours + ":" + ts.Minutes + ":" + ts.Seconds;

}

private void button2_Click(object sender, EventArgs e)

{

tm.Stop();

timeS = 0;

}

VB.NET 2005编写定时关机程序

最近在网上搜索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

图

现在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

图

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( 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

图

双击timer 控件如图

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

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

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

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vb.net程序编写 vbnet web编程

VB.NET怎么编模拟袖珍计算器的完整程序？

用VB.NET编写以下程序。

VB.NET 2005编写定时关机程序

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