How do I stop the childform overlapping the menubar and statusbar when i use Setparent?

Posted on 2010-01-11
Medium Priority
Last Modified: 2013-11-25
As a test app, I have a .net MDI parent form, with a standard menubar and statusbar.  On the 'new' button click, I start a new process, get it's window handle using .MainWindowHandle, and pass it to SetParent, to make it a child of the main form.  This works, however if I maximize the child window it overlaps the menubar and the statusbar.  It also overlaps the menu/status bar when the form is moved around inside the client area.

Any ideas how i stop this?  I only want it to expand into the main client area.

Many Thanks in advance
Dim p As New Process
        p.StartInfo.FileName = "notepad.exe"

        SetParent(p.MainWindowHandle(), Me.Handle)

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Question by:ITPOL
LVL 27

Expert Comment

ID: 26290257
This is what I use in a MDI...
this code will fill inthe MDI area and check to make sure that it is not running already in the background under someother screen.
This code will also kept the Maximized Child Forms from flickering when opening

Public Const WM_SETREDRAW As Integer = &HB
Public Declare Auto Function SendMessage Lib "User32" Alias "SendMessageA" (ByVal hWnd As IntPtr, ByVal msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Boolean

'ADD this to your button or menu click
Dim objForm As Form = New frmMyNewScreen
                    With objForm
                        If Not CheckActive(.Name) Then
                            .Dock = DockStyle.Fill
                            SendMessage(Me.Handle, WM_SETREDRAW, 0, 0)
                            .Text = "My New Screen"
                            .MdiParent = Me
                            .Text = "My New Screen"
                            .MdiParent = Me
                            .TopMost = True
                        End If
                    End With
'' IF you use a StatusBar  then un-comment
 ''       StatusBar1.Height += 1
 ''   StatusBar1.Height -= 1     
    SendMessage(Me.Handle, WM_SETREDRAW, 1, 0)

  Private Function CheckActive(ByVal pChildName As String) As Boolean
        '//  Check to see if the form 
        '//  is already open for viewing
        For Each childForm As Form In Me.MdiChildren
            If TypeName(childForm).ToUpper = pChildName.ToUpper Then
                Return True
            End If
        Return False
    End Function

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Accepted Solution

ITPOL earned 0 total points
ID: 26291637
Thanks Planocz,

Unfortunately what I was also looking for was a way to turn the window handle into the form object, then the above code would be fine.

I managed to achieve what I was looking for using the following code and API's;

Thanks for your suggestion
p = New Process
        p.StartInfo.FileName = "notepad.exe"


        ' Create a new instance of the child form.
        Dim ChildForm As New ChildFormvb(p.MainWindowHandle)
        ' Make it a child of this MDI form before showing it.
        ChildForm.MdiParent = Me

        m_ChildFormNumber += 1
        ChildForm.Text = "Window " & m_ChildFormNumber
        'Dim panel1 As New Panel
        'panel1.Dock = DockStyle.Fill
        'panel1.BorderStyle = BorderStyle.Fixed3D

        'SetParent(p.MainWindowHandle(), Me.Handle)
        SetParent(p.MainWindowHandle(), ChildForm.Handle)

        ' Remove border and whatnot
        SetWindowLong(p.MainWindowHandle, GWL_STYLE, WS_VISIBLE)

        ' Move the window to overlay it on this window
        MoveWindow(p.MainWindowHandle, 0, 0, ChildForm.Width, ChildForm.Height, True)

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