vb.net发送广播 vbnet udp

vb.net中SendMessager的问题

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As String, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As String) As Long

改为

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As String, ByVal wMsg As integer, ByVal wParam As integer , ByVal lParam As String) As integer

再试试，

可能你的声明使用vb6。0 复制过来的，long 全部改成integer

相关问答

Q1: VB.NET串口通讯怎么发送和接收十六进制？

串口通信最终都是用二进制传输的，你用代码把二进制转化成十六进制就可以了。不需要额外设置。

Q2: vb.net UDP 本地发送和接收怎么使用同一个端口呢

DatagramSocket用于接收和发送UDP的Socket实例。该类有3个构造函数：DatagramSocket()：通常用于客户端编程，它并没有特定监听的端口，仅仅使用一个临时的。程序会让操作系统分配一个可用的端口。DatagramSocket(int port)：创建实例，并固定监听Port端口的报文。通常用于服务端。

Q3: vb如何向所有窗口广播自定义消息

Public WM_DefineMessage As Long WM_DefineMessage = RegisterWindowMessage("Msg123") '引号里是自定义消息名字 PostMessage HWND_BROADCAST, WM_DefineMessage, 0, 0 '后面两个参数你可以自己指定数据，对应下面函数的wParam和lParam Function NotifyIconWindowProc(ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

'程序代码End Function

Q4: 求一个VB.NET进行局域网内UDP广播的源代码例子

给你个udp多播例子，广播不是很清楚，呵呵

Imports System.Net

Imports System.Net.Sockets

Imports System.Text

Public Class Form1

Inherits System.Windows.Forms.Form

Dim port As String

Dim ipadd As String

Dim ipend As IPEndPoint

Dim sendudp As New UdpClient()

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _

Handles Button1.Click

Dim ipadress As IPAddress

ipadress = IPAddress.Parse(TextBox1.Text)

'sendport = Int32.Parse(TextBox2.Text)

'ipend = New IPEndPoint(ipadress, sendport)

Try

sendudp.JoinMulticastGroup(ipadress)

MessageBox.Show("启动完成！")

Catch ex As Exception

MessageBox.Show(ex.Message)

End Try

End Sub

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