PPT2000: How to Use the Presentations.Open Method (222758)

MORE INFORMATION

Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements. NOTE: The following macro examples work only in PowerPoint. Visual Basic for Applications macros are not supported by the Microsoft PowerPoint Viewer. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Parameters

There are four parameters that you can use to control the behavior of the Open method:

Name	DataType	Required
FileName	String	Yes
ReadOnly	Long	Optional
Untitled	Long	Optional
WithWindow	Long	Optional

FileName

The FileName parameter is the path and name of the presentation that you want to open. The following Visual Basic example opens a file named test.ppt located in the C:\ root directory.

   Sub OpenPresentation()
      Presentations.Open "c:\test.ppt"
   End Sub
				

ReadOnly

The ReadOnly parameter is used to open a presentation as Read-Only. The following example opens a file named test.ppt as Read-Only.

   Sub OpenPresentationReadOnly()
      Presentations.Open "c:\test.ppt", msoTrue
   End Sub
				

The parameter, msoTrue, tells PowerPoint to open the presentation ReadOnly. When test.ppt is open, the following text appears in the title bar:
If you do not specify the msoTrue parameter, it is set to msoFalse (the default), and the presentation opens as Read/Write.

Untitled

The Untitled parameter is used to create a copy of the presentation. The following example opens a copy of test.ppt.

   Sub OpenCopy()
      Presentations.Open "c:\test.ppt", Untitled:=msoTrue
   End Sub
				

If you do not specify the msoTrue parameter, it is set to msoFalse (the default), and the file name only appears in the title bar:

WithWindow

The WithWindow parameter open a presentation without making it visible. The following example opens test.ppt, does not show it, and then closes it.

   Sub OpenInvisible()

      Dim MyPres As Presentation

      Set MyPres = Presentations.Open("c:\test.ppt", _
                                       WithWindow:=msoFalse)

      ' Close the presentation.
      MyPres.Close

   End Sub
				

NOTE: When you are finished with the invisible presentation, make sure you close the presentation.

If you do not specify the msoFalse parameter, it is set to msoTrue (the default).

This code example:

Presentations.Open "c:\test.ppt", WithWindow:=msoTrue
				

is equivalent to this code example:

Presentations.Open "c:\test.ppt"
				

Using the Return Value

The Open method returns a reference to a presentation object. Once you have the object reference, you can use it to access methods and properties of the presentation.

   Sub GetReturnValue()

      Dim MyPres As Presentation

      Set MyPres = Presentations.Open("c:\test.ppt")

      ' This counts the number of slides in test.ppt.
      MsgBox MyPres.Slides.Count

   End Sub
				

NOTE: To use the return value of a method, set the method to a variable and enclose the parameters in parentheses.

Error Trapping the Open Method

The following sample code demonstrates how you can trap errors that may occur when you use the Open method:

   Sub ErrorTrapOpen()

      On Error Resume Next

      ' Clear all values in the Err object.
      Err.Clear

      Dim MyPres As Presentation

      Set MyPres = Presentations.Open("c:\file does not exist.ppt")

      ' If error occurred when opening the file, display the error message.
      If Err.Number <> 0 Then
         MsgBox Err.Description, vbCritical, "Error " & Err.Number
      End If

   End Sub
				

The On Error Resume Next statement allows the macro to continue to execute starting with the statement that follows the statement that generated the error. If you do not use the On Error Resume Next statement, you will receive a run-time error if the file cannot be opened and the macro quits. When a run-time error occurs, information about that error is stored in the Err object.

For more information about the Err object, ask the Microsoft PowerPoint Office Assistant.