在vb.net中如何定義staticextern函數(shù)

在vb.net中定義staticextern函數(shù)：用static聲明的局部變量。static是C++中常用的修飾符，它被用來控制變量的存貯方式和可見性。extern，C是使C++能夠調用C寫作的庫文件的一個手段。

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vb.net 畫直線問題

'把“Dim graph As Graphics = Me.CreateGraphics”挪到“Button1_Click”事件內，調試過成功！

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無法輸入

你是用輸入法的吧，這個是.Net Framework的Bug吧，用輸入法的步驟如下：

1、首先保證文本框有焦點

2、按下2次Ctrl+空格

3、切換到自己要用的輸入法

這樣一般都可以了

用vb.net實現(xiàn)網(wǎng)絡通信

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中如何畫實心的圓

在PictureBox1上畫紅色的實心圓：

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的快捷鍵

1． F12：轉到定義；Shift+F12：轉到引用

2． F5：啟動；Ctrl+F5：開始執(zhí)行（不調試）；Shift+F5：停止調試

3． F7：查看代碼；Shift+F7：查看視圖設計器

4． Ctrl+Alt+L：解決方案資源管理器

5． Ctrl+Alt+J：對象瀏覽器

6． F4：顯示屬性窗口

7． Ctrl+Alt+X：工具箱

8． Ctrl+Alt+C類視圖

9． Alt+Enter：查看屬性

10．F10：逐過程調試

11．F11：逐語句調試

12．Ctrl+B：新斷點

13．Ctrl+Shift+F9：清除所有斷點

14．Ctrl+Shift+B生成解決方案

15．Shift+Alt+Enter：全屏

16．大綱顯示：Ctrl+M, Ctrl+M：切換大綱顯示展開；Ctrl+M, Ctrl+L：切換所有大綱顯示；Ctrl+M,Crtl+P停止大綱顯示；Ctrl+M, Ctrl+O：折疊到定義

17．智能感知：Ctrl＋J：列出成員；Ctrl+Shift+空格：參數(shù)信息； Ctrl+K,Ctrl+I：快速信息；Alt+右箭頭鍵：完成單詞