How to extract images from pdf file?

[Mariaprabudass E]

I need to extract images from pdf file. There is option in Acrobat 8.0(Advanced-->Document Processing-->Export All images). I tried to automate that process. But i could not know how to close the browser window. Could you please advice me. I pasted my code below.

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim gp As Acrobat.CAcroApp
Dim gpdoc As Acrobat.CAcroAVDoc
gp = CType(CreateObject("AcroExch.App"), Acrobat.CAcroApp)
gpdoc = CType(CreateObject("AcroExch.AVDoc"), Acrobat.CAcroAVDoc)
gpdoc.Open("D:\main.pdf", "Acrobat")
gp.Show()
Dim ok As Boolean
ok = gp.MenuItemExecute("ImageConversion:Export")
If ok = False Then
MessageBox.Show("Faile")
End If
End Sub

Thanks,
Prabudass