vb点虐 与c通讯 vbnet和c语言

vb点虐 调用C语言可执行程序并传值？

在c语言中每一个变量都有两个属性一个是值，一个是址。比如inta=2;变量a的值是2，变量a的地址，可以用取地址

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操作符

获取，即a。因此以C语言的函数传递中具备两种方式传递参数，一种是传址，一种传值。比如voidf1(intv){;}//函数f1v

vb点虐 如何与c语言做的dll互相传递字符串

首先是C的DLL（我的项目叫ConsoleApplication2.dll）：

#include Windows.h

// 导出Test函数，供外部使用

extern "C" __declspec(dllexport) BSTR __cdecl Test(LPSTR p);

BOOL WINAPI DllMain(

HINSTANCE hinstDLL,

DWORD fdwReason,

LPVOID lpReserved)

{

switch (fdwReason)

{

case DLL_PROCESS_ATTACH: break;

case DLL_THREAD_ATTACH: break;

case DLL_THREAD_DETACH: break;

case DLL_PROCESS_DETACH: break;

}

return TRUE;

}

BSTR __cdecl Test(LPSTR p)

{

p[0] = 'X';

return SysAllocString((BSTR)p);

}

然后是VB.Net项目：

Imports System.Runtime.InteropServices

Imports System.Text

Module Module1

REM 生成的是ConsoleApplication2.dll，名字与C里面相同

DllImport("ConsoleApplication2.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.Cdecl)

Public Function Test(MarshalAs(UnmanagedType.LPTStr) ByVal str As StringBuilder) As MarshalAs(UnmanagedType.BStr) String

End Function

Sub Main()

Dim str As StringBuilder = New StringBuilder("Hello")

Dim rstr As String = Test(str)

Console.WriteLine(rstr)

Console.ReadKey()

End Sub

End Module

运行结果：

用vb点虐 实现网络通信

用 vb点虐 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