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：

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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

Next

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 If

End Sub

vb.net怎么加载和卸载窗体

VB.net 加载窗体 form2.show() 卸载窗体 me.close()加载窗体和VB没啥区别，而卸载就截然不同了。附：VB 加载窗体 form2.show 卸载窗体 unload me

如何用VB.NET把执行文件加到窗体中

加以一个panel用来显示应用程序的，就是放你那个easycap的，代码如下

Declare Function SetParent Lib "user32" Alias "SetParent" (ByVal hWndChild As IntPtr, ByVal hWndNewParent As IntPtr) As Integer

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

Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hwnd As Int32, ByVal wMsg As Int32, ByVal wParam As Int32, ByVal lParam As Int32) As Int32

Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Int32, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Int32) As Int32

Private Const WM_SYSCOMMAND As Int32 = H112

Private Const SC_MAXIMIZE As Int32 = HF030

Private Const SC_MINIMIZE As Int32 = HF020

Private Const SC_RESTORE As Int32 = HF120

Public Const SW_HIDE = 0

Public Const SW_SHOW = 5

Private Declare Function ShowWindow Lib "user32.dll" (ByVal hwnd As Int32, ByVal nCmdShow As Int32) As Int32

Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

ShellExecute(Me.Panel1.Handle, "open", "c:\windows\system32\cmd.exe", Nothing, ".", SW_HIDE)

System.Threading.Thread.Sleep(50)

Dim h As IntPtr = FindWindow(Nothing, "c:\windows\system32\cmd.exe")

ShowWindow(h, SW_HIDE)

SetParent(h, Me.Panel1.Handle) '嵌到panel1内

SendMessage(h, WM_SYSCOMMAND, SC_MAXIMIZE, 0)

End Sub

把其中的c:\windows\system32\cmd.exe换成你要嵌入的应用程序