用 vb.net socket通信
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Dim th As Threading.Thread
2 Dim tcpl As System.Net.Sockets.TcpListener
3
4 Private Sub Form1_Load()Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
5 th = New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf MyListen))
6 th.Start()
7 End Sub
8
9 Public Sub SendMessage()Sub SendMessage(ByVal IP As String, ByVal SendMsg As String)
10 Try
11 If IP "" Then
12 Dim tcpc As New System.Net.Sockets.TcpClient(IP, 5656)
13 Dim tcpStream As Net.Sockets.NetworkStream = tcpc.GetStream
14 Dim reqStream As New IO.StreamWriter(tcpStream)
15 reqStream.Write(SendMsg)
16 reqStream.Flush()
17 tcpStream.Close()
18 tcpc.Close()
19 End If
20 Catch ex As Exception
21 MsgBox(ex.Message.ToString)
22 End Try
23 End Sub
24 Private Sub MyListen()Sub MyListen()
25 Try
26 Dim ipAddress As System.Net.IPAddress = System.Net.Dns.Resolve(System.Net.Dns.GetHostName).AddressList(0)
27 tcpl = New System.Net.Sockets.TcpListener(ipAddress, 5656)
28 tcpl.Start()
29 While True
30 Dim s As System.Net.Sockets.Socket = tcpl.AcceptSocket()
31 Dim MyBuffer(1024) As Byte
32 Dim i As Integer
33 i = s.Receive(MyBuffer)
34 If i 0 Then
35 Dim lstrRec As String
36 Dim j As Integer
37 For j = 0 To i - 1
38 TextBox1.Text += Chr(MyBuffer(j)) ","
39 Next
40 End If
41 End While
42 Catch ex As Exception
43 MsgBox(ex.Message.ToString)
44 End Try
45 End Sub
46
47 Private Sub Button1_Click()Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
48 SendMessage("192.168.0.61", TextBox2.Text)
49 End Sub
简单说下思路吧，具体的代码可以查资料
首先要会画曲线图，有三种方法：
1、用mschar控件（vb6的）；2、用水晶报表；3、用word图表
x轴为时间，y轴为数据
要实现实时数据刷新，只要用 定时器 定时刷新曲线图的数据就可以了（x、y的数据重写）
Private Const WS_CHILD = H40000000
Private Const WS_VISIBLE = H10000000
Private Const WM_CAP_START = H400
Private Const WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10
Private Const WM_CAP_SET_SCALE = WM_CAP_START + 53
Private Const WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52
Private Const WM_CAP_SET_PREVIEW = WM_CAP_START + 50
Private Declare Function capCreateCaptureWindowA Lib "avicap32.dll" ( _
ByVal lpszWindowName As String, _
ByVal dwStyle As Long, _
ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Integer, _
ByVal hWndParent As Long, ByVal nID As Long) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As Long) As Long
Private Sub Form_Load()
'建立采集窗口（不显示窗口，处理后显示到PIC控件）
uwndc = capCreateCaptureWindowA("", WS_VISIBLE Or WS_CHILD, 0, 0, 320, 240, Me.hWnd, 0)
'连接
SendMessage uwndc, WM_CAP_DRIVER_CONNECT, 0, 0
'Scale开
SendMessage uwndc, WM_CAP_SET_SCALE, True, 0
'显示刷新MS
SendMessage uwndc, WM_CAP_SET_PREVIEWRATE, 40, 0
'用予览方式显示(特殊需要，不显示予缆）
SendMessage uwndc, WM_CAP_SET_PREVIEW, True, 0
End Sub
上述代码就可以实现 但是要注意相应的控件是否存在 不存在的 你自己画出来
既然从网上找的实例没问题，也许就是调用的时候没出来或者在检测网卡当中出现了问题。
.net不能获得【指定】网卡的信息，给个思路，先遍历所有网卡，然后找到你需要的的那个网卡的信息。
1·绑定数据源来进行连接
2.用代码连接
先到数据库建立一个数据库和相应的表
连接数据库的代码：
Dim str As String = "Data Source=服务器名;Initial Catalog=数据库名;Persist Security Info=True;User ID=;Password="
dim conn As SqlClient.SqlConnection
try
conn = New SqlClient.SqlConnection
conn.ConnectionString = str
conn.Open()
Return True
Catch ex As Exception
MsgBox(ex.ToString)
Return False
End Try
登录代码：Dim str As String = "Data Source=服务器名;Initial Catalog=数据库名;Persist Security Info=True;User ID=;Password="
dim conn As SqlClient.SqlConnection
conn = New SqlClient.SqlConnection
conn.ConnectionString = str
conn.Open()
sqlstr = "Select * From Amd Where AmdName='" TextBox1.Text "' And AmdPwd = '" TextBox2.Text "'"
Dim sqlcmd As SqlClient.SqlCommand = New SqlClient.SqlCommand(sqlstr, conn)
Dim dr As SqlClient.SqlDataReader
dr = sqlcmd.ExecuteReader
If dr.Read = True Then '判断一条记录为真
kf.Show() '显示下个窗体
Me.Hide() ’隐藏当前窗体
Else
MessageBox.Show("输入信息有误！", "提示")
TextBox1.Text = ""
TextBox2.Text = ""
End If
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