Open Presentation

Besides creating PowerPoint presentations from scratch, Aspose.Slides allows you to open existing presentations. After you load a presentation, you can get information about the presentation, edit the presentation (content on its slides), add new slides or remove existing ones, etc.

Open Presentation

To open an existing presentation, you simply have to instantiate the Presentation class and pass the file path (of the presentation you want to open) to its constructor.

This PHP code shows you how to open a presentation and also find out the number of slides it contains:

  # Instantiates the Presentation class and passes the file path to its constructor
  $pres = new Presentation("Presentation.pptx");
  try {
    # Prints the total number of slides present in the presentation
    echo($pres->getSlides()->size());
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

Open Password Protected Presentation

When you have to open a password-protected presentation, you can pass the password through the Password property (from the LoadOptions class) to decrypt the presentation and load the presentation. This PHP code demonstrates the operation:

  $loadOptions = new LoadOptions();
  $loadOptions->setPassword("YOUR_PASSWORD");
  $pres = new Presentation("pres.pptx", $loadOptions);
  try {
    # Do some work with the decrypted presentation
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

Open Large Presentation

Aspose.Slides provides options (the BlobManagementOptions property in particular) under the LoadOptions class to allow you to load large presentations.

This Java demonstrates an operation in which a large presentation (say 2GB in size) is loaded:

  $loadOptions = new LoadOptions();
  $loadOptions->getBlobManagementOptions()->setPresentationLockingBehavior(PresentationLockingBehavior->KeepLocked);
  $loadOptions->getBlobManagementOptions()->setTemporaryFilesAllowed(true);
  $loadOptions->getBlobManagementOptions()->setMaxBlobsBytesInMemory(0);
  $pres = new Presentation("veryLargePresentation.pptx", $loadOptions);
  try {
    # The large presentation has been loaded and can be used, but the memory consumption is still low.
    # makes changes to the presentation.
    $pres->getSlides()->get_Item(0)->setName("Very large presentation");
    # The presentation will be saved to the other file. The memory consumption stays low during the operation
    $pres->save("veryLargePresentation-copy.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

Info

To circumvent certain limitations when interacting with a stream, Aspose.Slides may copy the stream’s content. Loading a large presentation through its stream will result in the copying of the presentation’s contents and cause slow loading. Therefore, when you intend to load a large presentation, we strongly recommend that you use the presentation file path and not its stream.

When you want to create a presentation that contains large objects (video, audio, big images, etc.), you can use the Blob facility to reduce memory consumption.

Load Presentation

Aspose.Slides provides IResourceLoadingCallback with a single method to allow you to manage external resources. This PHP code shows you how to use the IResourceLoadingCallback interface:

class ImageLoadingHandler {
    function resourceLoading($args) {
      if (java_values($args->getOriginalUri()->endsWith(".jpg"))) {
        # loads substitute image
        $file = new Java("java.io.File", "aspose-logo.jpg");
        $Array = new JavaClass("java.lang.reflect.Array");
        $Byte = new JavaClass("java.lang.Byte");
        $imageBytes = $Array->newInstance($Byte, $Array->getLength($file));
        try {
            $dis = new Java("java.io.DataInputStream", new Java("java.io.FileInputStream", $file));
            $dis->readFully($imageBytes);
        } finally {
            if (!java_is_null($dis)) $dis->close();
        }
          $args->setData($imageBytes);
          return ResourceLoadingAction::UserProvided;
      } else if (java_values($args->getOriginalUri()->endsWith(".png"))) {
        # sets substitute url
        $args->setUri("http://www.google.com/images/logos/ps_logo2.png");
        return ResourceLoadingAction::Default;
      }
      # skips all other images
      return ResourceLoadingAction::Skip;
    }
  }

  $opts = new LoadOptions();
  $loadingHandler = java_closure(new ImageLoadingHandler(), null, java("com.aspose.slides.IResourceLoadingCallback"));
  $opts->setResourceLoadingCallback($loadingHandler);
  $pres = new Presentation("presentation.pptx", $opts);

Load Presentation Without Embedded Binary Objects

The PowerPoint presentation can contain the following types of the embedded binary objects:

• VBA Project (IPresentation.VbaProject);
• OLE Object embedded data (IOleEmbeddedDataInfo.EmbeddedFileData);
• ActiveX Control binary data (IControl.ActiveXControlBinary);

Using the ILoadOptions.DeleteEmbeddedBinaryObjects property, you can load the presentation without any embedded binary objects.

This property can be useful for removing potentially malicious binary content.

The code demonstrates how to load and save a presentation without any malware content:

  $loadOptions = new LoadOptions();
  $loadOptions->setDeleteEmbeddedBinaryObjects(true);

  $pres = new Presentation("malware.ppt", $loadOptions);
  try {
    $pres->save("clean.ppt", SaveFormat::Ppt);
  } finally {
    if (!java_is_null(pres)) { 
      $pres->dispose();
    }
  }

Open and Save Presentation

Steps to Open and Save Presentation:

1. Create an instance of the Presentation class and pass the file you want to open.
2. Save the presentation.

  # Instantiates a Presentation object that represents a PPT file
  $pres = new Presentation();
  try {
    # ...do some work here...
    # Saves your presentation to a file
    $pres->save("demoPass.pptx", SaveFormat::Pptx);
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }