vb.net读取网口信息,vb网口通信

VB.NET 获取网关IP MAC地址

我找了一些C# 的VB。NET 貌似很少不过都是。NET 平台。你看看吧都应该通用的。

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添加对System.Management的引用

using System.Management;

。。。

//获取IP,子网掩码(subnet mask)和默认网关

ManagementClass mc = new ManagementClass( "Win32_NetworkAdapterConfiguration ");

ManagementObjectCollection nics = mc.GetInstances();

foreach(ManagementObject nic in nics)

{

if(Convert.ToBoolean(nic[ "ipEnabled "]) == true)

{

Console.WriteLine((nic[ "IPAddress "] as String[])[0]);

Console.WriteLine((nic[ "IPSubnet "] as String[])[0]);

Console.WriteLine((nic[ "DefaultIPGateway "] as String[])[0]);

}

}

获取硬件信息源代码:

获取硬件信息演示程序:

汉化

利用using System.Management类来获取相应的硬件知识

其实这类东西很容易找到答案的,方法非常多,最常见的API模式,你去搜索吧,保证一把一把的

vb.net 怎么用事件触发的方式读取串口数据

首先:

textbox里没有显示,是因为SerialPort1和TextBox2不是同一线程创建的,需要跨线程操作。需要用到委托,这样才能显示出来。

其次:

我觉得用串口的接收数据事件更好一些。

下面代码供参考:

'----------------------

'串口接收数据事件,其实比用定时器更好,

'触发事件的条件可以自己在form_load中设置ReceivedBytesThreshold属性数值,默认为ReceivedBytesThreshold=1

Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived

Dim strRecvData As String = ""

strRecvData = SerialPort1.ReadExisting

Call disPlayComData(strRecvData)

End Sub

Delegate Sub callback(ByVal strT As String) '定义委托

Sub showString(ByVal comdata As String) '显示结果

Me.TextBox1.Text = "结果:" comdata

End Sub

Sub disPlayComData(ByVal strTmp As String) '判定是否为跨线程

If Me.TextBox1.InvokeRequired Then

Dim d As New callback(AddressOf showString)

Me.Invoke(d, New Object() {strTmp})

Else

Me.TextBox1.Text = strTmp

End If

End Sub

VB.NET 如何获取网页中的数据

Public Function webCaptureContent(ByVal mWebsiteUrl As String, ByVal mWebsiteType As Boolean) As String

'启动一次具体的数据采集工作,返回采集到的HTML内容:要求必须输入带://的全地址数据

On Error Resume Next

Dim Str_WebContent As String = "请输入查找网站地址."

Dim wb As WebClient = New WebClient() '//创建一个WebClient实例

If mWebsiteUrl.IndexOf("://") 0 Then

'//获取或设置用于对向 Internet 资源的请求进行身份验证的网络凭据。(可有可无)

wb.Credentials = CredentialCache.DefaultCredentials

'//从资源下载数据并返回字节数组。(加@是因为网址中间有"/"符号)

Dim pagedata As Object = wb.DownloadData(mWebsiteUrl)

'//转换字符

If mWebsiteType Then

Str_WebContent = Encoding.Default.GetString(pagedata)

Else

Str_WebContent = Encoding.UTF8.GetString(pagedata)

End If

End If

Return Str_WebContent '提取出来新闻内容,删除Body前后的多余内容,同时补充上该 Body标记,形成完整的内容 Str_WebContent '

End Function

求VB.NET读取网页内容写法

Imports System.Net

Imports System.IO

Imports System.Text.RegularExpressions

Public Class Form1

Private Sub button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

Dim stream As IO.Stream = WebRequest.Create(UrlAdress).GetResponse().GetResponseStream()

'注意urladress为你上面的网页地址。

Dim sr As StreamReader = New StreamReader(stream, System.Text.Encoding.UTF8)

Label1.Text = Regex.Match(sr.ReadToEnd, "回答采纳率").ToString

'sr。readtoend读取网页流到末尾,即使用正则表达式从网页流中提取“回答采纳率”,赋值给Label1.Text ‘没有则为空

sr.Dispose() '关闭流

End Sub'要提取什么东西用正则表达式最好

End Class

电脑有两张网卡。如何用vb.net分别获取网卡的IP?求大神明路!

'要使得引用System.Management有效,先通过菜单

'[项目]--[添加引用],在“.Net”选项卡里,选择“System.Management”,单击[确定]

Imports System.Management

Public Class Form1

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

Dim MySearcher As New ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration")

For Each MySearcherObj As ManagementObject In MySearcher.Get

If CBool(MySearcherObj("IPEnabled")) Then

MsgBox(MySearcherObj("IPAddress")(0))

End If

Next

End Sub

End Class


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