Save Presentations in C++
Overview
Open Presentations in C++ described how to use the Presentation class to open a presentation. This article explains how to create and save presentations. The Presentation class contains a presentation’s contents. Whether you’re creating a presentation from scratch or modifying an existing one, you’ll want to save it when you’re finished. With Aspose.Slides for C++, you can save to a file or stream. This article explains the different ways to save a presentation.
Save Presentations to Files
Save a presentation to a file by calling the Presentation class’s Save method. Pass the file name and save format to the method. The following example show how to save a presentation with Aspose.Slides.
// Instantiate the Presentation class that represents a presentation file.
auto presentation = MakeObject<Presentation>();
// Do some work here...
// Save the presentation to a file.
presentation->Save(u"Output.pptx", SaveFormat::Pptx);
presentation->Dispose();
Save Presentations to Streams
You can save a presentation to a stream by passing an output stream to the Presentation class’s Save method. A presentation can be written to many stream types. In the example below, we create a new presentation and save it to a file stream.
// Instantiate the Presentation class that represents a presentation file.
auto presentation = MakeObject<Presentation>();
auto fileStream = MakeObject<FileStream>(u"Output.pptx", FileMode::Create);
// Save the presentation to the stream.
presentation->Save(fileStream, SaveFormat::Pptx);
presentation->Dispose();
fileStream->Close();
Save Presentations with a Predefined View Type
Aspose.Slides lets you set the initial view that PowerPoint uses when the generated presentation opens through the ViewProperties class. Use the set_LastView method with a value from the ViewType enumeration.
auto presentation = MakeObject<Presentation>();
presentation->get_ViewProperties()->set_LastView(ViewType::SlideMasterView);
presentation->Save(u"SlideMasterView.pptx", SaveFormat::Pptx);
presentation->Dispose();
Save Presentations in the Strict Office Open XML Format
Aspose.Slides lets you save a presentation in the Strict Office Open XML format. Use the PptxOptions class and set its conformance property when saving. If you set Conformance.Iso29500_2008_Strict, the output file is saved in the Strict Office Open XML format.
The example below creates a presentation and saves it in the Strict Office Open XML format.
auto options = MakeObject<PptxOptions>();
options->set_Conformance(Conformance::Iso29500_2008_Strict);
// Instantiate the Presentation class that represents a presentation file.
auto presentation = MakeObject<Presentation>();
// Save the presentation in the Strict Office Open XML format.
presentation->Save(u"StrictOfficeOpenXml.pptx", SaveFormat::Pptx, options);
presentation->Dispose();
Save Presentations in Office Open XML Format in Zip64 Mode
An Office Open XML file is a ZIP archive that imposes 4 GB (2^32 bytes) limits on the uncompressed size of any file, the compressed size of any file, and the total size of the archive, and it also limits the archive to 65,535 (2^16-1) files. ZIP64 format extensions raise these limits to 2^64.
The IPptxOptions::set_Zip64Mode method lets you choose when to use ZIP64 format extensions when saving an Office Open XML file.
This method can be used with the following modes:
IfNecessaryuses ZIP64 format extensions only if the presentation exceeds the limitations above. This is the default mode.Nevernever uses ZIP64 format extensions.Alwaysalways uses ZIP64 format extensions.
The following code demonstrates how to save a presentation as PPTX with ZIP64 format extensions enabled:
auto pptxOptions = MakeObject<PptxOptions>();
pptxOptions->set_Zip64Mode(Zip64Mode::Always);
auto presentation = MakeObject<Presentation>(u"Sample.pptx");
presentation->Save(u"OutputZip64.pptx", SaveFormat::Pptx, pptxOptions);
presentation->Dispose();
NOTE
When you save withZip64Mode.Never, a PptxException is thrown if the presentation cannot be saved in ZIP32 format.
Save Presentations without Refreshing the Thumbnail
The PptxOptions::set_RefreshThumbnail method controls thumbnail generation when saving a presentation to PPTX:
- If set to
true, the thumbnail is refreshed during save. This is the default. - If set to
false, the current thumbnail is preserved. If the presentation has no thumbnail, none is generated.
In the code below, the presentation is saved to PPTX without refreshing its thumbnail.
auto pptxOptions = MakeObject<PptxOptions>();
pptxOptions->set_RefreshThumbnail(false);
auto presentation = MakeObject<Presentation>(u"Sample.pptx");
presentation->Save(u"Output.pptx", SaveFormat::Pptx, pptxOptions);
presentation->Dispose();
Info
This option helps reduce the time required to save a presentation in PPTX format.Save Progress Updates in Percentage
The IProgressCallback interface is used via the set_ProgressCallback method exposed by the ISaveOptions interface and the abstract SaveOptions class. Assign an IProgressCallback implementation with set_ProgressCallback to receive save-progress updates as a percentage.
The following code snippets show how to use IProgressCallback.
class ExportProgressHandler : public IProgressCallback
{
public:
void Reporting(double progressValue)
{
// Use the progress percentage value here.
int progress = static_cast<int>(progressValue);
Console::WriteLine(u"{0}% of the file has been converted.", progress);
}
};
auto saveOptions = MakeObject<PdfOptions>();
saveOptions->set_ProgressCallback(MakeObject<ExportProgressHandler>());
auto presentation = MakeObject<Presentation>(u"Sample.pptx");
presentation->Save(u"Output.pdf", SaveFormat::Pdf, saveOptions);
presentation->Dispose();