Retrieve and Update Presentation Information in C++

Aspose.Slides for C++ allows you to examine a presentation to find out its properties and understand its behavior.

Info

The PresentationInfo and DocumentProperties classes contain the properties and methods used in operations here.

Check a Presentation Format

Before working on a presentation, you may want to find out what format (PPT, PPTX, ODP, and others) the presentation is in at the moment.

You can check a presentation’s format without loading the presentation. See this C++ code:

auto info = PresentationFactory::get_Instance()->GetPresentationInfo(u"pres.pptx");
// PPTX
Console::WriteLine(ObjectExt::ToString(info->get_LoadFormat()));

auto info2 = PresentationFactory::get_Instance()->GetPresentationInfo(u"pres.ppt");
// PPT
Console::WriteLine(ObjectExt::ToString(info2->get_LoadFormat()));

auto info3 = PresentationFactory::get_Instance()->GetPresentationInfo(u"pres.odp");
// ODP
Console::WriteLine(ObjectExt::ToString(info3->get_LoadFormat()));

Get Presentation Properties

This C++ code shows you how to get presentation properties (information about the presentation):

auto info = PresentationFactory::get_Instance()->GetPresentationInfo(u"pres.pptx");
auto props = info->ReadDocumentProperties();
Console::WriteLine(ObjectExt::ToString(props->get_CreatedTime()));
Console::WriteLine(props->get_Subject());
Console::WriteLine(props->get_Title());
// .. 

Update Presentation Properties

Aspose.Slides provides the PresentationInfo::UpdateDocumentProperties method that allows you to make changes to presentation properties.

Let’s say we have a PowerPoint presentation with the document properties shown below.

This code example shows you how to edit some presentation properties:

auto fileName = u"sample.pptx";

auto info = PresentationFactory::get_Instance()->GetPresentationInfo(fileName);

auto properties = info->ReadDocumentProperties();
properties->set_Title(u"My title");
properties->set_LastSavedTime(DateTime::get_Now());

info->UpdateDocumentProperties(properties);
info->WriteBindedPresentation(fileName);

The results of changing the document properties are shown below.

Useful Links

To get more information about a presentation and its security attributes, you may find these links useful:

• Checking whether a Presentation is Encrypted
• Checking whether a Presentation is Write Protected (read-only)
• Checking whether a Presentation is Password Protected Before Loading it
• Confirming the Password Used to Protect a Presentation.

FAQ

How can I check whether fonts are embedded and which ones they are?

Look for embedded-font information at the presentation level, then compare those entries with the set of fonts actually used across content to identify which fonts are critical for rendering.

How can I quickly tell if the file has hidden slides and how many?

Iterate through the slide collection and inspect each slide’s visibility flag.

Can I detect whether custom slide size and orientation are used, and whether they differ from the defaults?

Yes. Compare the current slide size and orientation with the standard presets; this helps anticipate behavior for printing and export.

Is there a quick way to see if charts reference external data sources?

Yes. Traverse all charts, check their data source, and note whether the data is internal or link-based, including any broken links.

How can I assess ‘heavy’ slides that may slow rendering or PDF export?

For each slide, tally object counts and look for large images, transparency, shadows, animations, and multimedia; assign a rough complexity score to flag potential performance hotspots.