VB.NE รบกวนขอข้อมูลและโค้ดหน่อยคับต้องการเปิดไฟล์ MS Power Point บน Window Form คับ

<DllImport("user32.dll", EntryPoint := "FindWindow", SetLastError := True)> _
Private Shared Function FindWindow(ZeroOnly As IntPtr, lpWindowName As String) As IntPtr
End Function

<DllImport("user32.dll", SetLastError := True)> _
Private Shared Function SetParent(hWndChild As IntPtr, hWndNewParent As IntPtr) As IntPtr
End Function

<DllImport("user32.dll", SetLastError := True, CharSet := CharSet.Auto)> _
Public Shared Function SetWindowText(hwnd As IntPtr, lpString As [String]) As Boolean
End Function


Private FileName As String = ""
Private application As PowerPoint.Application
Private presentation As PowerPoint.Presentation
Private flag As Boolean = False

Public Sub New()
	InitializeComponent()
End Sub


Public Sub open()
	sair()

	openFileDialog1.Filter = "Powerpoint file (*.ppt)|*.ppt|All files (*.*)|*.*"

	If openFileDialog1.ShowDialog() = DialogResult.OK Then
		FileName = openFileDialog1.FileName

		Dim screenClasshWnd As IntPtr = DirectCast(0, IntPtr)
		Dim x As IntPtr = DirectCast(0, IntPtr)

		flag = True

		application = New PowerPoint.Application()
		presentation = application.Presentations.Open2007(FileName, Microsoft.Office.Core.MsoTriState.msoTrue, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoTrue)
		Dim sst1 As PowerPoint.SlideShowSettings = presentation.SlideShowSettings


		sst1.ShowType = DirectCast(1, PowerPoint.PpSlideShowType)
		Dim sw As PowerPoint.SlideShowWindow = sst1.Run()


		sw.Height = (panel1.Height) - 64
		sw.Width = (panel1.Width) - 130

		Dim formhWnd As IntPtr = FindWindow(x, "Form1")
		Dim pptptr As IntPtr = DirectCast(sw.HWND, IntPtr)
		screenClasshWnd = FindWindow(x, "screenClass")
		SetParent(pptptr, panel1.Handle)

		Me.Focus()

		Me.application.SlideShowEnd += New Microsoft.Office.Interop.PowerPoint.EApplication_SlideShowEndEventHandler(SlideShowEnds)
	End If
End Sub