In this tutorial, we will understand how to convert PUB) to PNG using C++. You will notice that the conversion takes place in two steps. Firstly, the PUB file is converted to a PDF file and then the intermediate PDF file is rendered to PNG format using C++ with simple API calls.
Steps to Convert PUB to PNG using C++
- Install Aspose.PUB for C++ and Aspose.PDF for C++ from NuGet package Manager Tool
- Add reference to Aspose::Pub and Aspose::Pdf namespaces
- Load the input PUB file with Document class instance
- Create the intermediate PDF file with ConvertToPdf method
- Iterate each page and create the output PNG images
You can efficiently export PUB to PNG using C++ with simple API calls in few lines of code. You only need to specify the file paths and make the method calls then the API considers all minor details of the conversion process by itself. After processing, the output PNG images are saved as per your requirements.
Code to Convert PUB to PNG using C++
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| #pragma once | |
| #include <stdio.h> | |
| #include <tchar.h> | |
| #include <cstdint> | |
| #include <iostream> | |
| // TODO: reference additional headers your program requires here | |
| #include "system/console.h" | |
| #include "system/string.h" | |
| #include "system/io/directory.h" | |
| #include <Aspose.Pub.Cpp/Properties/AssemblyInfo.h> | |
| #include <Aspose.Pub.Cpp/PubFactory.h> | |
| #include <Aspose.Pub.Cpp/Document.h> | |
| #include <Aspose.Pub.Cpp/Interfaces.h> | |
| #include <Aspose.Pub.Cpp/License.h> | |
| #include <Aspose.Pub.Cpp/MetaInfo.h> | |
| #include <Aspose.PDF.Cpp/Page.h> | |
| #include <Aspose.PDF.Cpp/Document.h> | |
| #include <Aspose.PDF.Cpp/PageCollection.h> | |
| #include <Aspose.PDF.Cpp/Resources.h> | |
| #include <Aspose.PDF.Cpp/XImageCollection.h> | |
| #include <Aspose.PDF.Cpp/XImage.h> | |
| #include <Aspose.PDF.Cpp/License.h> | |
| #include <Aspose.PDF.Cpp/License.h> | |
| #include <Aspose.PDF.Cpp/Devices/PngDevice.h> | |
| #include <Aspose.PDF.Cpp/Devices/Resolution.h> | |
| #include <Aspose.PUB.Cpp/License.h> | |
| #include <Aspose.PUB.Cpp/PubFactory.h> | |
| #include <Aspose.PUB.Cpp/Utils/UtilityObjects.h> | |
| #include <system/smart_ptr.h> | |
| using namespace System; | |
| using namespace Aspose::Pdf; | |
| using namespace Aspose::Pub; | |
| class ConvertPUBtoPNGEx { | |
| public: | |
| static void PUBtoPNG() | |
| { | |
| // Initialize license object of Aspose.PUB to convert PUB to PDF | |
| auto PUBlicense = System::MakeObject<Aspose::Pub::License>(); | |
| // Set license | |
| PUBlicense->SetLicense(u"Aspose.Total.NET.lic"); | |
| // Initialize license object of Aspose.PDF API to convert PDF to PNG | |
| auto PDFlicense = System::MakeObject<Aspose::Pdf::License>(); | |
| // Set license | |
| PDFlicense->SetLicense(u"Aspose.Total.NET.lic"); | |
| System::String filePub = u"Sample.pub"; | |
| System::String filePdf = u"Test.pdf"; | |
| System::SharedPtr<IPubParser> parser = PubFactory::CreateParser(filePub); | |
| System::SharedPtr<Aspose::Pub::Document> document = parser->Parse(); | |
| PubFactory::CreatePdfConverter()->ConvertToPdf(document, filePdf); | |
| // Load the intermediate PDF file created from PUB file | |
| System::SharedPtr<Aspose::Pdf::Document> pdfDocument = MakeObject<Aspose::Pdf::Document>(filePdf); | |
| // Iterate throught the PDF pages for image conversion | |
| for (System::SharedPtr<Page> page : pdfDocument->get_Pages()) | |
| { | |
| // Create an instance of the FileStream class for output PNG image | |
| System::SharedPtr<System::IO::FileStream> imageStream = System::IO::File::Create(String::Format(u"page_{0}.png", page->get_Number())); | |
| // Create an instance of the Resolution class to set resolution of PNG | |
| System::SharedPtr<Aspose::Pdf::Devices::Resolution> resolution = MakeObject<Aspose::Pdf::Devices::Resolution>(300); | |
| // Create an instance of the PngDevice class to render images | |
| System::SharedPtr<Aspose::Pdf::Devices::PngDevice> pngDevice = MakeObject<Aspose::Pdf::Devices::PngDevice>(500, 700, resolution); | |
| // Save the page as PNG image output | |
| pngDevice->Process(page, imageStream); | |
| // Close the stream | |
| imageStream->Close(); | |
| } | |
| } | |
| }; |
In previous topic, we learned how to read PDF File in C++. Whereas, in this article we have discussed how using C++ create PNG from PUB file.
