在vb.net中如何定义staticextern函数

在vb.net中定义staticextern函数：用static声明的局部变量。static是C++中常用的修饰符，它被用来控制变量的存贮方式和可见性。extern，C是使C++能够调用C写作的库文件的一个手段。

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vb.net 画直线问题

'把“Dim graph As Graphics = Me.CreateGraphics”挪到“Button1_Click”事件内，调试过成功！

Public Class Form1

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

Dim graph As Graphics = Me.CreateGraphics

Dim pen2 As Pen = New Pen(Color.Green, 3)

graph.DrawLine(pen2, 400, 400, 500, 200)

End Sub

End Class

vb.nettxt无法输入

你是用输入法的吧，这个是.Net Framework的Bug吧，用输入法的步骤如下：

1、首先保证文本框有焦点

2、按下2次Ctrl+空格

3、切换到自己要用的输入法

这样一般都可以了

用vb.net实现网络通信

用 vb.net socket通信

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

在VB.Net中如何画实心的圆

在PictureBox1上画红色的实心圆：

Private Sub DrawCircle(ByVal cp As Point, ByVal radius As Integer, ByVal color As Brush)

Dim gr As Graphics

gr = PictureBox1.CreateGraphics

Dim rect As Rectangle = New Rectangle(cp.X - radius, cp.Y - radius, 2 * radius, 2 * radius)

gr.DrawEllipse(Pens.Black, rect)

gr.FillEllipse(color, rect)

End Sub

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

DrawCircle(New Point(120, 100), 80, Brushes.Red)

End Sub

VB.net的快捷键

1． F12：转到定义；Shift+F12：转到引用

2． F5：启动；Ctrl+F5：开始执行（不调试）；Shift+F5：停止调试

3． F7：查看代码；Shift+F7：查看视图设计器

4． Ctrl+Alt+L：解决方案资源管理器

5． Ctrl+Alt+J：对象浏览器

6． F4：显示属性窗口

7． Ctrl+Alt+X：工具箱

8． Ctrl+Alt+C类视图

9． Alt+Enter：查看属性

10．F10：逐过程调试

11．F11：逐语句调试

12．Ctrl+B：新断点

13．Ctrl+Shift+F9：清除所有断点

14．Ctrl+Shift+B生成解决方案

15．Shift+Alt+Enter：全屏

16．大纲显示：Ctrl+M, Ctrl+M：切换大纲显示展开；Ctrl+M, Ctrl+L：切换所有大纲显示；Ctrl+M,Crtl+P停止大纲显示；Ctrl+M, Ctrl+O：折叠到定义

17．智能感知：Ctrl＋J：列出成员；Ctrl+Shift+空格：参数信息； Ctrl+K,Ctrl+I：快速信息；Alt+右箭头键：完成单词

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