锐客网

  1. 首页 > 生活百科 > it技术 > >

vb.net新的进程 vbs进程

IT技术process

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
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
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.Idcurrent.Id Then
If process.MainModule.FileName = current.MainModule.FileName Then
Return process
End If
End If
Next
Return Nothing
End Function
End Module
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 = https://www.04ip.com/post/True
End Sub
WriteOnly Property LoopSwitch As Boolean
Set
loopSwitchValue = https://www.04ip.com/post/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
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 。
【vb.net新的进程 vbs进程】vb.net新的进程的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于vbs进程、vb.net新的进程的信息别忘了在本站进行查找喔 。

    推荐阅读


    上一篇：付款html代码，html流星雨代码

    下一篇：抖音直播素材ink，抖音直播素材是什么意思