有没有办法“继承"?第二种形式的一个串行端口类实例? [英] Is there a way to "Inherit" a serialport class instance on a second form?

问题描述

大家好，我在处理IO.Ports.Serialport时遇到了问题

我有这堂课，

Hi guys, quick question, in dealing with IO.Ports.Serialport

I have this class,

''' <summary>
''' Routines for finding and accessing COM ports.
''' </summary>

Public Class ComPorts
'....this class contains different properties and subs that handle the serial port communication. for example:
   Friend Shared Sub FindComPorts()
'.....omitted
    End Sub
Friend Function OpenComPort() As Boolean
'...omitted
End Function

"等等.
(这来自lvr.com的串行通信示例)
我在第一种形式上使用此类，例如

''and such..
(this came from a serial communication example from lvr.com)
I''m using this class on my first form , like such

 Public UserPort1 As ComPorts
'...
UserPort1.OpenComPort()

我的问题在这里出现:现在，在第一个窗体上打开了端口(UserPort1声明为:Public UserPort1作为第一个窗体上的ComPorts)，当我关闭/隐藏第一个窗体并给出焦点/时，如何保持端口打开?显示第二种形式?

---------------------------

更新:
感谢您的答复.我添加了一个公共模块

My question arises here: now that the port is open on the first form(UserPort1 is declared:Public UserPort1 As ComPorts on the first form), how do I keep the port open,when I close/hide the first form and give focus/show the second form??

---------------------------

UPDATE:
Thank you for the reply. I added a public module

Module PublicSerialPortModuel
    Public UserPort1 As ComPorts

End Module

现在我可以在Form2中使用UserPort1，而无需使用"form1.xxxx"前缀.

但是我遇到了另一个问题，这让我真的很不高兴(好..困惑)
我在form1上使用了偶数处理程序来处理DataReceived事件

and now I can use UserPort1 in form2 without the "form1.xxxx" prefix.

I run into another problem though, which got me really nonplussed(well..confused)
I used a even handler on form1 to handle DataReceived event

AddHandler UserPort1.SelectedPort.DataReceived, AddressOf DataReceivedHandler

那个子就像

and that sub is something like

  Private Sub DataReceivedHandler(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs)
      COMportReadBuffer1 = UserPort1.SelectedPort.ReadExisting
      While UserPort1.SelectedPort.BytesToRead > 0
          COMportReadBuffer1 &= UserPort1.SelectedPort.ReadExisting
      End While
End Sub

在第一种形式上一切正常.但是当我在form2上做同样的事情时，

which works all fine on the first form. But when I do the same thing on form2,

AddHandler UserPort1.SelectedPort.DataReceived, AddressOf DataReceivedHandler2

当触发DataReceived事件并进入DataReceivedHandler2()时，读取缓冲区为空白，并且其长度为0

您能想到任何可能的原因吗?我现在无法在公共模块中将UserPort1公开定义为

when DataReceived event is triggered and I get into DataReceivedHandler2(), the read buffer is blank and its length is 0

Can you think of any possible reasons for this? I can''t ..with UserPort1 now being defined public in the public module

推荐答案

我不认为您的问题很清楚.如果您只想联系并使用该类，则必须对委托进行此操作:
http://msdn.microsoft.com/en-us/magazine/cc301810.aspx [ ^ ]
http://msdn.microsoft.com/en-us/library/ms173171％28v = vs.100％29.aspx [ ^ ]

或本网站上的内容:
http://www.codeproject.com/search.aspx?q = delegate& x = 0& y = 0& sbo = kw& usfc = false [

I dont think your question is comepletely clear. If you just want to have contact and use the class you would have to do that with delegates:
http://msdn.microsoft.com/en-us/magazine/cc301810.aspx[^]
http://msdn.microsoft.com/en-us/library/ms173171%28v=vs.100%29.aspx[^]

Or something on this site:
http://www.codeproject.com/search.aspx?q=delegate&x=0&y=0&sbo=kw&usfc=false[^]

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