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 '后面两戚搭个参数你可以自己指定数据，对应下面高逗拿函数指毁的wParam和lParam Function NotifyIconWindowProc(ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

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'程序代码End Function

vb点虐 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

改为姿告旅

Private Declare Function SendMessage Lib "user32"友孙 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。迹凳0 复制过来的，long 全部改成integer

求一个VB.NET进行局域网内UDP广播的源代码例子

给你个蠢闷裤udp多播例带简子，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！罩笑")

Catch ex As Exception

MessageBox.Show(ex.Message)

End Try

End Sub

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