Convert PowerPoint Slides to PNG in C++

About PowerPoint to PNG Conversion

The PNG (Portable Network Graphics) format is not as popular as JPEG (Joint Photographic Experts Group), but it still very popular.

Use case: When you have a complex image and size is not an issue, PNG is a better image format than JPEG.

Tip

You may want to check out Aspose free PowerPoint to PNG Converters: PPTX to PNG and PPT to PNG. They are a live implementation of the process described on this page.

Convert PowerPoint to PNG

Go through these steps:

1. Instantiate the Presentation class.
2. Get the slide object from the Presentation::get_Slides() collection under the ISlide interface.
3. Use a ISlide::GetImage() method to get the thumbnail for each slide.
4. Use the IImage::Save(String, ImageFormatPtr method to save the slide thumbnail to the PNG format.

This C++ code shows you how to convert a PowerPoint presentation to PNG:

auto pres = System::MakeObject<Presentation>(u"pres.pptx");
    
for (int32_t index = 0; index < pres->get_Slides()->get_Count(); index++)
{
    auto slide = pres->get_Slides()->idx_get(index);
    auto fileName = String::Format(u"slide_{0}.png", index);
    slide->GetImage()->Save(fileName, ImageFormat::Png);
}

Convert PowerPoint to PNG With Custom Dimensions

If you want to obtain PNG files around a certain scale, you can set the values for desiredX and desiredY, which determine the dimensions of the resulting thumbnail.

This code in C++ demonstrates the described operation:

auto pres = System::MakeObject<Presentation>(u"pres.pptx");

float scaleX = 2.f;
float scaleY = 2.f;
for (int32_t index = 0; index < pres->get_Slides()->get_Count(); index++)
{
    auto slide = pres->get_Slides()->idx_get(index);
    auto fileName = String::Format(u"slide_{0}.png", index);
    slide->GetImage(scaleX, scaleY)->Save(fileName, ImageFormat::Png);
}

Convert PowerPoint to PNG With Custom Size

If you want to obtain PNG files around a certain size, you can pass your preferred width and height arguments for ImageSize.

This code shows you how to convert a PowerPoint to PNG while specifying the size for the images:

auto pres = System::MakeObject<Presentation>(u"pres.pptx");
    
Size size(960, 720);
for (int32_t index = 0; index < pres->get_Slides()->get_Count(); index++)
{
    auto slide = pres->get_Slides()->idx_get(index);
    auto fileName = String::Format(u"slide_{0}.png", index);
    slide->GetImage(size)->Save(fileName, ImageFormat::Png);
}