Kako pretvoriti PUB u PNG koristeći C++

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++

  1. Instalirajte Aspose.PUB for C++ i Aspose.PDF for C++ iz alata za upravljanje paketima NuGet
  2. Dodajte referencu na prostore imena Aspose::Pub i Aspose::Pdf
  3. Učitajte ulaznu PUB datoteku s instancom klase Document
  4. Stvorite međupdf datoteku metodom ConvertToPdf
  5. 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++

#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.

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