vb.net窗口实例的简单介绍

VB.NET 拖动无边框窗体编程实例

Imports System Drawing Imports System Windows Forms ****************************************** Private oOriginalRegion As Region = Nothing 用于窗体移动 Private bFormDragging As Boolean = False Private oPointClicked As Point ****************************************** Private Sub Form _MouseDown(ByVal sender As Object ByVal e As System Windows Forms MouseEventArgs) Handles MyBase MouseDown Me bFormDragging = True Me oPointClicked = New Point(e X e Y) End Sub ****************************************** Private Sub Form _MouseUp(ByVal sender As Object ByVal e As System Windows Forms MouseEventArgs) Handles MyBase MouseUp Me bFormDragging = False End Sub ****************************************** Private Sub Form _MouseMove(ByVal sender As Object ByVal e As System Windows Forms MouseEventArgs) Handles MyBase MouseMove If Me bFormDragging Then Dim oMoveToPoint As Point 以当前鼠标位置为基础找出目标位置 oMoveToPoint = Me PointToScreen(New Point(e X e Y)) 根据开始位置作出调整 oMoveToPoint Offset(Me oPointClicked X * _ (Me oPointClicked Y + _ SystemInformation CaptionHeight + _ SystemInformation BorderSize Height) * ) 移动窗体 Me Location = oMoveToPoint End If

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lishixinzhi/Article/program/ASP/201311/21755

如何给VB.NET窗体添加子窗体？

直接添加一个MID父窗体或在已有窗体的属性中找到IsMDIContainer属性，然后设置为True，然后创建第二个窗体，需要加载子窗体的时候：

Dim NewMDIChild As New Form2

NewMDIChild.MdiParent = Me

NewMDIChild.Show()

Public Shared Sub CheckMDIChildForm(ByVal MDIForm As Windows.Forms.Form, ByVal MDIChildForm As Windows.Forms.Form, ByVal MDIChildFormName As String)

If MDIForm.MdiChildren.Length 1 Then

'如果没有任何一个MDI子窗体，则创该MDI子窗体的窗体实例

Dim MDIChildFrm As Windows.Forms.Form = MDIChildForm ' 定义MDI子窗体

MDIChildFrm.MdiParent = MDIForm '指定父窗体

MDIChildFrm.Show() '打开窗体

Exit Sub

Else

Dim x As Integer

Dim frmyn As Boolean

For x = 0 To (MDIForm.MdiChildren.Length) - 1

Dim tempChild As Windows.Forms.Form = CType(MDIForm.MdiChildren(x), Windows.Forms.Form)

If tempChild.Name = MDIChildFormName Then

'检测到有该MDI子窗体，设为激活并退出循环

frmyn = True

tempChild.BringToFront()

Exit For

Else

frmyn = False

End If

If Not frmyn Then

'在打开的窗体中没检测到则新建

Dim MDIChildFrm As Windows.Forms.Form = MDIChildForm ' 定义MDI子窗体

MDIChildFrm.MdiParent = MDIForm '指定父窗体

MDIChildFrm.Show() '打开窗体

End If

End Sub

vb.net实例化窗口后如何区分打开的窗口

If App.PrevInstance = True Then

End

End If

如果程序正在运行，结束程序。

在模块中加入每个窗口的标题变量。

然后用if then 来判断是否有相同窗口。

如果你事先不知道有哪些窗口的话，那你就用枚举 FindWindow来查找子窗口句柄。再用SendMessage 获得窗口标题再进行判断。

求vb.net句柄实例，实现操作其他程序窗口。如我给的例子

Imports System.Text

Imports System.Runtime.InteropServices

Public Class Form1

' 相关API函数声明,注释掉的这里没用到，但是也比较常用吧，这些函数的功能都能搜到。

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr

Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As IntPtr, ByVal hWnd2 As IntPtr, ByVal lpsz1 As String, ByVal lpsz2 As String) As IntPtr

Private Delegate Function EnumChildProc(ByVal hWnd As IntPtr, ByVal lParam As Integer) As Boolean

Private Declare Function EnumChildWindows Lib "user32.dll" (ByVal hWndParent As IntPtr, ByVal lpEnumFunc As EnumChildProc, ByVal lParam As Integer) As Boolean

Private Declare Auto Function SendMessage Lib "User32.dll" (ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As String) As Integer

'Private Declare Function CheckDlgButton Lib "user32" Alias "CheckDLGButtonA" (ByVal hDlg As IntPtr, ByVal nIDButton As IntPtr, ByVal wCheck As Integer) As Integer

Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hWnd As IntPtr, ByVal lpClassName As StringBuilder, ByVal nMaxCount As Integer) As Integer

'Private Declare Function GetWindowThreadProcessId Lib "user32" Alias "GetWindowThreadProcessId" (ByVal hwnd As IntPtr, ByVal lpdwProcessId As Long) As Integer

Private Declare Auto Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLength" (ByVal hwnd As IntPtr) As Integer

Private Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As IntPtr, ByVal lpString As StringBuilder, ByVal cch As Integer) As Integer

' 相关消息定义，也有没用到的

Const WM_SETTEXT = HC

Const WM_GETTEXT = HD

'Const WM_SETFOCUS = H7

'Const WM_KILLFOCUS = H8

'Const WM_CLOSE = H10

'Const WM_SYSCOMMAND = H112

'Const SC_CLOSE = HF060

'Const SC_MINIMIZE = HF020

Const BM_GETCHECK = HF0

Const BM_SETCHECK = HF1

Const BM_GETSTATE = HF2

Const BM_SETSTATE = HF3

Const BM_SETSTYLE = HF4

Const BM_CLICK = HF5

'Const BM_GETIMAGE = HF6

'Const BM_SETIMAGE = HF7

Const BST_UNCHECKED = O0

Const BST_CHECKED = O1

Const BST_INDETERMINATE = O2

' 储存窗口句柄

Dim WindowHandle As IntPtr

' 储存两个（或者多个）编辑框句柄

Dim EditHandle As New List(Of IntPtr)

Dim EditWindowsText As List(Of String)

' 储存复选框句柄

Dim CheckHandle As IntPtr = 0

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Button1_Click(sender, e)

End Sub

' EnumChildWindows 回调函数，该函数名作为API函数EnumChildWindows 的一个参数

' 该函数实现了枚举各个子窗口，找出编辑框属性的功能

Public Function EnumChildProcC(ByVal hwnd As IntPtr, ByVal lParam As Integer) As Boolean

Dim dwWindowClass As StringBuilder = New StringBuilder(100)

' 获得某一个句柄的类名

GetClassName(hwnd, dwWindowClass, 100)

If dwWindowClass.ToString.Contains("EDIT") Or dwWindowClass.ToString.Contains("Edit") Then ' 类名包含EDIT的为编辑框

EditHandle.Add(hwnd) ' 存储该句柄

End If

' 返回 True 一直枚举完

Return True

End Function

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

WindowHandle = FindWindow(vbNullString, "登陆")

If WindowHandle.ToInt32 = 0 Then

MsgBox("未捕获到窗口" + "登陆")

Return

End If

' 枚举所有主窗口的子窗口（控件），枚举时自动调用回调函数，完成编辑框句柄的获取

EnumChildWindows(WindowHandle, AddressOf EnumChildProcC, 0)

' 寻找复选框

CheckHandle = FindWindowEx(WindowHandle, IntPtr.Zero, vbNullString, "记住密码")

Dim str As New StringBuilder

Dim j As Integer = 0

' 对编辑框文本赋值

For j = 0 To EditHandle.Count - 1

SendMessage(EditHandle(j), WM_SETTEXT, 0, "Text")

'GetWindowText(EditHandle(j), str, 20)

'EditWindowsText.Add(Str.ToString)

'Str.Clear()

If EditHandle.Count = 0 Then

MsgBox("未找到输入框！")

End If

If CheckHandle.ToInt32 0 Then

'CheckDlgButton(WindowHandle, id, 1)

' 对复选框进行鼠标单击操作

SendMessage(CheckHandle, BM_CLICK, 0, 0)

'SendMessage(CheckHandle, BM_SETCHECK, True, 0)

End If

End Sub

End Class

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vb.net窗口实例的简单介绍

VB.NET 拖动无边框窗体编程实例

如何给VB.NET窗体添加子窗体？

vb.net实例化窗口后如何区分打开的窗口

求vb.net句柄实例，实现操作其他程序窗口。如我给的例子

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