Access Slide in Presentation

Aspose.Slides allows you to access slides in two ways: by index and by ID.

Access Slide by Index

All slides in a presentation are arranged numerically based on the slide position starting from 0. The first slide is accessible through index 0; the second slide is accessed through index 1; etc.

The Presentation class, representing a presentation file, exposes all slides as an ISlideCollection collection (collection of ISlide objects). This Python code shows you how to access a slide through its index:

import aspose.slides as slides

# Instantiates a Presentation object that represents a presentation file
with slides.Presentation(path + "AccessSlides.pptx") as presentation:
    # Gets a slide's reference through its index
    slide = presentation.slides[0]

Access Slide by ID

Each slide in a presentation has a unique ID associated with it. You can use the get_slide_by_id(id) method (exposed by the Presentation class) to target that ID. This Python code shows you how to provide a valid slide ID and access that slide through the get_slide_by_id(id) method:

import aspose.slides as slides

# Instantiates a Presentation object that represents a presentation file
with slides.Presentation(path + "AccessSlides.pptx") as presentation:
    # Gets a Slide ID
    id = presentation.slides[0].slide_id
    # Accesses the slide through its ID
    slide = presentation.get_slide_by_id(id)

Change Slide Position

Aspose.Slides allow you to change a slide position. For example, you can specify that the first slide should become the second slide.

1. Create an instance of the Presentation class.
2. Get the slide’s reference (whose position you want to change) through its index
3. Set a new position for the slide through the slide_number property.
4. Save the modified presentation.

This Python code demonstrates an operation in which the slide in position 1 is moved to position 2:

import aspose.slides as slides

# Instantiates a Presentation object that represents a presentation file
with slides.Presentation(path + "ChangePosition.pptx") as pres:
    # Gets the slide whose position will be changed
    sld = pres.slides[0]
    # Sets the new position for the slide
    sld.slide_number = 2
    # Saves the modified presentation
    pres.save("Aspose_out.pptx", slides.export.SaveFormat.PPTX)

The first slide became the second; the second slide became the first. When you change a slide’s position, other slides are automatically adjusted.

Set Slide Number

Using the first_slide_number property (exposed by the Presentation class), you can specify a new number for the first slide in a presentation. This operation causes other slide numbers to be recalculated.

1. Create an instance of the Presentation class.
2. Get the slide number.
3. Set the slide number.
4. Save the modified presentation.

This Python code demonstrates an operation where the first slide number is set to 10:

import aspose.slides as slides

# Instantiates a Presentation object that represents a presentation file
with slides.Presentation(path + "HelloWorld.pptx") as presentation:
    # Gets the slide number
    firstSlideNumber = presentation.first_slide_number
    # Sets the slide number
    presentation.first_slide_number = 10
    # Saves the modified presentation
    presentation.save("Set_Slide_Number_out.pptx", slides.export.SaveFormat.PPTX)

If you prefer to skip the first slide, you can start the numbering from the second slide (and hide the numbering for the first slide) this way:

import aspose.slides as slides

with slides.Presentation() as presentation:
    layout_slide = presentation.layout_slides.get_by_type(slides.SlideLayoutType.BLANK)
    presentation.slides.add_empty_slide(layout_slide)
    presentation.slides.add_empty_slide(layout_slide)
    presentation.slides.add_empty_slide(layout_slide)

    # Sets the number for the first presentation slide
    presentation.first_slide_number = 0

    # Shows slide numbers for all slides
    presentation.header_footer_manager.set_all_slide_numbers_visibility(True)

    # Hides the slide number for the first slide
    presentation.slides[0].header_footer_manager.set_slide_number_visibility(False)

    # Saves the modified presentation
    presentation.save("output.pptx", slides.export.SaveFormat.PPTX)