vb.net新的进程 vbs进程

vb.net 如何完全关闭子窗口的所有进程?在线等~

这样的话你就不要直接把子窗口show出来，先在父窗口创建一个子窗口对象的变量，通过实例化该变量达到创建子窗口的目的，然后在下次又要打开子窗口时也可以通过该变量关闭原有的子窗口

示例代码如下(假设Form1为父窗口，Form2为子窗口):

Form1的代码:

Public

Class

Form1

Dim

nform

As

Form2

=

Nothing

Private

Sub

Button1_Click(ByVal

sender

As

System.Object,

ByVal

e

As

System.EventArgs)

Handles

Button1.Click

If

nform

IsNot

Nothing

Then

nform.Close()

nform.Dispose()

End

If

nform

=

New

Form2

nform.Show()

Me.Hide()

End

Sub

End

Class

通过nform变量，你可以很轻易就处理掉原来已经打开但隐藏着的子窗口了

相关问答

Q1: 求大神指点vb.net 怎么以指定方式打开图片呢?

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

        '建立新的系统进程    

        Dim process As New System.Diagnostics.Process()

        If RadioButton1.Checked Then

            '设置文件名，此处为图片的真实路径+文件名    

            process.StartInfo.FileName = "c:\a.bmp"

            '设置进程运行参数    

            process.StartInfo.Arguments = "rundll32.exe shimgvw.dll"

        Else

            process.StartInfo.FileName = "mspaint.exe"

            process.StartInfo.Arguments = "c:\a.bmp"

        End If

        '此项为是否使用Shell执行程序，因系统默认为true，此项也可不设，但若设置必须为true    

        'process.StartInfo.UseShellExecute = True

        '此处可以更改进程所打开窗体的显示样式，可以不设    

        'process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden

        process.Start()

        process.Close()

    End Sub

Q2: vb.net 怎么判断当前程序是否正在运行？

Imports System.Runtime.InteropServices

Module Module1

Sub Main()

Dim instance As Process = RunningInstance()

If instance IsNot Nothing Then

ShowWindowAsync(instance.MainWindowHandle, 3) '调用api函数，正常显示窗口

Return

End If

Dim F1 As New Form1

Application.Run(F1) '显示窗体

End Sub

DllImport("User32.dll")

Public Function ShowWindowAsync(ByVal hWnd As System.IntPtr, ByVal cmdShow As Integer) As Boolean

End Function

Private Function RunningInstance() As Process '返回进程中已经打开的程序

Dim current As Process = Process.GetCurrentProcess()

Dim processes As Process() = Process.GetProcessesByName(current.ProcessName)

For Each process As Process In processes

If process.Id current.Id Then

If process.MainModule.FileName = current.MainModule.FileName Then

Return process

End If

End If

Next

Return Nothing

End Function

End Module

Q3: vb.net中如何设置进程的基本优先级

下面的代码示例说明了更改线程优先级的结果。创建两个线程，其中一个线程的优先级设置为 BelowNormal。两个线程在 while 循环中都增加一个变量，并运行一段设定的时间。

Option Explicit

Option Strict

Imports System

Imports System.Threading

Public Class Test

MTAThread _

Shared Sub Main()

Dim priorityTest As New PriorityTest()

Dim threadOne As Thread = _

New Thread(AddressOf priorityTest.ThreadMethod)

threadOne.Name = "ThreadOne"

Dim threadTwo As Thread = _

New Thread(AddressOf priorityTest.ThreadMethod)

threadTwo.Name = "ThreadTwo"

threadTwo.Priority = ThreadPriority.BelowNormal

threadOne.Start()

threadTwo.Start()

' Allow counting for 10 seconds.

Thread.Sleep(10000)

priorityTest.LoopSwitch = False

End Sub

End Class

Public Class PriorityTest

Dim loopSwitchValue As Boolean

Sub New()

loopSwitchValue = True

End Sub

WriteOnly Property LoopSwitch As Boolean

Set

loopSwitchValue = Value

End Set

End Property

Sub ThreadMethod()

Dim threadCount As Long = 0

While loopSwitchValue

threadCount += 1

End While

Console.WriteLine("{0} with {1,11} priority " _

"has a count = {2,13}", Thread.CurrentThread.Name, _

Thread.CurrentThread.Priority.ToString(), _

threadCount.ToString("N0"))

End Sub

End Class

Q4: VB.net在Windows7下检测进程是否存在

VB.net（VS2008）里面比C#还好弄，不需要自己加manifest，直接在项目属性的“应用程序”里面点击“查看UAC设置”，在新打开的app.manifest里面把 requestedExecutionLevel level="asInvoker" uiAccess="false" / 替换成 requestedExecutionLevel level="requireAdministrator" uiAccess="false" / 再编译就行了。

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