U ovom ćemo vodiču razumjeti kako pretvoriti PUB) u PNG koristeći C++. Primijetit ćete da se konverzija odvija u dva koraka. Najprije se PUB datoteka pretvara u PDF datoteku, a zatim se posredna PDF datoteka prikazuje u PNG formatu pomoću jezika C++ s jednostavnim API pozivima.
Koraci za pretvaranje PUB-a u PNG koristeći C++
- Instalirajte Aspose.PUB for C++ i Aspose.PDF for C++ iz alata za upravljanje paketima NuGet
- Dodajte referencu na prostore imena Aspose::Pub i Aspose::Pdf
- Učitajte ulaznu PUB datoteku s instancom klase Document
- Stvorite međupdf datoteku metodom ConvertToPdf
- Iterirajte svaku stranicu i stvorite izlazne PNG slike
Možete učinkovito izvesti PUB u PNG koristeći C++ s jednostavnim API pozivima u nekoliko redaka koda. Trebate samo navesti putove datoteka i izvršiti pozive metode, a API će sam uzeti u obzir sve manje detalje procesa pretvorbe. Nakon obrade, izlazne PNG slike spremaju se prema vašim zahtjevima.
Kod za pretvaranje PUB-a u PNG koristeći 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(); | |
| } | |
| } | |
| }; |
U prethodnoj temi naučili smo kako čitati PDF datoteku u C++. Dok smo u ovom članku raspravljali o tome kako pomoću C++ stvoriti PNG iz PUB datoteke.
