请使用office来实现以下的功能。可以将PPT中所有的可编辑文本提取出来。在PPT中按ALT+F11。然后点击插入、然后选择模块，把下面的内容复制进去，执行。就可以在PPT所在的目录下面产生一个对应的TXT文件。

Sub ExportText()
Dim oPres As Presentation
Dim oSlides As Slides
Dim oSld As Slide 'Slide Object
Dim oShp As Shape 'Shape Object
Dim iFile As Integer 'File handle for output
iFile = FreeFile 'Get a free file number
Dim PathSep As String
Dim FileNum As Integer
Dim sTempString As String

#If Mac Then
    PathSep = "/"
#Else
    PathSep = "\"
#End If

Set oPres = ActivePresentation
Set oSlides = oPres.Slides

FileNum = FreeFile
'Open output file
' NOTE: errors here if file hasn't been saved
'Open oPres.Path & PathSep & "AllText.txt" For Output As FileNum
Open oPres.Path & PathSep & oPres.Name & ".txt" For Output As FileNum

num_slides = ActivePresentation.Slides.Count

For i = 1 To num_slides

    Set oSld = ActivePresentation.Slides(i)

    Print #iFile, "Slide:" & vbTab & CStr(oSld.SlideNumber)

    For Each oShp In oSld.Shapes
        'Check to see if shape has a text frame and text
        If oShp.HasTextFrame And oShp.TextFrame.HasText Then

            If oShp.Type = msoTextBox Then ' Check if shape is a TextBox

                Print #iFile, "文本框：" & vbTab & oShp.TextFrame.TextRange

            ElseIf oShp.Type = msoPlaceholder Then

                Select Case oShp.PlaceholderFormat.Type

                    Case Is = ppPlaceholderTitle, ppPlaceholderCenterTitle
                        Print #iFile, "标题：" & vbTab & oShp.TextFrame.TextRange

                    Case Is = ppPlaceholderBody
                        Print #iFile, "正文：" & vbTab & oShp.TextFrame.TextRange

                    Case Is = ppPlaceholderSubtitle
                        Print #iFile, "副标题：" & vbTab & oShp.TextFrame.TextRange

                    Case Else
                        Print #iFile, "其他占位符：" & vbTab & oShp.TextFrame.TextRange

                End Select

            Else ' it doesn't have a textframe - it might be a group that contains text so:

                If oShp.Type = msoGroup Then

                    sTempString = TextFromGroupShape(oShp)

                    If Len(sTempString) > 0 Then

                        Print #iFile, sTempString

                    End If

                ElseIf oShp.Type = msoSmartArt Then

                    sTempString = TextFromSmartArtNode(oShp.SmartArt.Nodes, 0)

                    If Len(sTempString) > 0 Then

                        Print #iFile, sTempString

                    End If

                End If

            End If ' msoPlaceholder

        End If ' Has text frame/Has text

    Next oShp

    Print #iFile, vbCrLf

Next i

Close #iFile

'MsgBox "文件已创建在 '" & oPres.Path & PathSep & "AllText.txt'"
MsgBox "文件已创建在 '" & oPres.Path & PathSep & oPres.Name & ".txt'"

End Sub


Function TextFromGroupShape(oSh As Shape) As String
' Returns the text from the shapes in a group
' and
' recursively, text within shapes within groups within groups etc.

Dim oGpSh As Shape
Dim sTempText As String

If oSh.Type = msoGroup Then
For Each oGpSh In oSh.GroupItems

    With oGpSh

        If .Type = msoGroup Then

            sTempText = sTempText & TextFromGroupShape(oGpSh)

        Else

            If .HasTextFrame Then

                If .TextFrame.HasText Then

                    sTempText = sTempText & " (Gp:) " & .TextFrame.TextRange.Text & vbCrLf

                End If

            End If

        End If

    End With

Next

End If

TextFromGroupShape = sTempText

End Function

Function TextFromSmartArtNode(oSh As SmartArtNodes, depth As Long) As String
' Returns the text from the shapes in a SmartArt shape recursively

Dim sTempText As String
Dim i As Long

For i = 1 To oSh.Count
With oSh(i)

    If .TextFrame2.TextRange.Text <> "" Then

        If depth = 0 Then

            sTempText = sTempText & " (SmartArt:)" & .TextFrame2.TextRange & vbCrLf

        Else

            sTempText = sTempText & Space(depth * 4) & .TextFrame2.TextRange & vbCrLf

        End If

        sTempText = sTempText & TextFromSmartArtNode(.Nodes, depth + 1)

    End If

End With
Next i

TextFromSmartArtNode = sTempText

End Function