Convert PUB to Image using C++ | https://blog.aspose.com/2021/07/23/convert-pub-to-image-using-cpp/

01_Convert_PUB_to_Image_using_CPP

Read the complete article about converting PUB files to Images using C++ by visiting the following link.
https://blog.aspose.com/2021/07/23/convert-pub-to-image-using-cpp/

PUB_To_JPG.cpp

// Source PUB and output PDF file paths
System::String filePub = u"SourceDirectory\\1.pub";
System::String filePdf = u"OutputDirectory\\1.pdf";

// Load the PUB file
System::SharedPtr<IPubParser> parser = PubFactory::CreateParser(filePub);
System::SharedPtr<Aspose::Pub::Document> document = parser->Parse();

// Convert the PUB file to PDF
PubFactory::CreatePdfConverter()->ConvertToPdf(document, filePdf);

// Load the generated PDF file
auto pdfDocument = MakeObject<Aspose::Pdf::Document>(filePdf);
auto info = MakeObject<Facades::PdfFileInfo>(pdfDocument);

// Iterate through the PDF pages
for (auto page : pdfDocument->get_Pages())
{
	// Get dimensions of the PDF page
	int width = info->GetPageWidth(page->get_Number());
	int height = info->GetPageHeight(page->get_Number());

	// Create an instance of the Resolution class
	auto resolution = MakeObject<Devices::Resolution>(300);

	// Create JPEG device with the specified Width, Height and Resolution
	auto device = MakeObject<Devices::JpegDevice>(width, height, resolution);

	// Create the File Stream for the output image
	System::SharedPtr<System::IO::FileStream> imageStream = System::IO::File::Create(String::Format(u"OutputDirectory\\page_{0}.jpg", page->get_Number()));

	// Convert the PDF page to JPG image
	device->Process(page, imageStream);

	// Close the stream
	imageStream->Close();
}

PUB_To_PNG.cpp

// Source PUB and output PDF file paths
System::String filePub = u"SourceDirectory\\1.pub";
System::String filePdf = u"OutputDirectory\\1.pdf";

// Load the PUB file
System::SharedPtr<IPubParser> parser = PubFactory::CreateParser(filePub);
System::SharedPtr<Aspose::Pub::Document> document = parser->Parse();

// Convert the PUB file to PDF
PubFactory::CreatePdfConverter()->ConvertToPdf(document, filePdf);

// Load the generated PDF file
auto pdfDocument = MakeObject<Aspose::Pdf::Document>(filePdf);
auto info = MakeObject<Facades::PdfFileInfo>(pdfDocument);

// Iterate through the PDF pages
for (auto page : pdfDocument->get_Pages())
{
	// Get dimensions of the PDF page
	int width = info->GetPageWidth(page->get_Number());
	int height = info->GetPageHeight(page->get_Number());

	// Create an instance of the Resolution class
	auto resolution = MakeObject<Devices::Resolution>(300);

	// Create PNG device with the specified Width, Height and Resolution
	auto device = MakeObject<Devices::PngDevice>(width, height, resolution);

	// Create the File Stream for the output image
	System::SharedPtr<System::IO::FileStream> imageStream = System::IO::File::Create(String::Format(u"OutputDirectory\\page_{0}.png", page->get_Number()));

	// Convert the PDF page to PNG image
	device->Process(page, imageStream);

	// Close the stream
	imageStream->Close();
}

PUB_To_TIFF.cpp

// Source PUB and output PDF file paths
System::String filePub = u"SourceDirectory\\1.pub";
System::String filePdf = u"OutputDirectory\\1.pdf";

// Load the PUB file
System::SharedPtr<IPubParser> parser = PubFactory::CreateParser(filePub);
System::SharedPtr<Aspose::Pub::Document> document = parser->Parse();

// Convert the PUB file to PDF
PubFactory::CreatePdfConverter()->ConvertToPdf(document, filePdf);

// Load the generated PDF file
auto pdfDocument = MakeObject<Aspose::Pdf::Document>(filePdf);
auto info = MakeObject<Facades::PdfFileInfo>(pdfDocument);

// Get dimensions of the first PDF page
int width = info->GetPageWidth(1);
int height = info->GetPageHeight(1);

// Create an instance of the Resolution class
auto resolution = MakeObject<Devices::Resolution>(300);

// Create an instance of TiffSettings class and set the required settings
auto settings = MakeObject<Devices::TiffSettings>();
settings->set_Compression(Devices::CompressionType::None);
settings->set_Depth(Devices::ColorDepth::Default);

// Create TIFF device with the specified Width, Height, Resolution and TiffSettings
auto device = MakeObject<Devices::TiffDevice>(width, height, resolution, settings);

// Create the File Stream for the output image
System::SharedPtr<System::IO::FileStream> imageStream = System::IO::File::Create(u"OutputDirectory\\pdf.tiff");

// Convert the PDF file to TIFF image
device->Process(pdfDocument, 1, 1, imageStream);

// Close the stream
imageStream->Close();