Using wrapper in CPP

Prerequisites

Please register Aspose.PDF for .NET with COM Interop, kindly check the article named Use Aspose.pdf for .NET via COM Interop.

Implementation details

We will use a wrapper to retrieve text from PDF documents.

#include "pch.h"
#include <comdef.h>

#import "TextRetriever.tlb"
using namespace System;

String^ wrapper(String^ file)
{
    String^ text;

    TextRetriever::IRetrieverPtr retrieverPtr;
    HRESULT hr = retrieverPtr.CreateInstance(__uuidof(TextRetriever::Retriever));

    if (FAILED(hr))
    {
        Console::WriteLine(L"Error occured");
    }
    else
    {
        // set license
        retrieverPtr->SetLicense("Aspose.PDF.lic");
        // retrieve text

        BSTR extractedText = retrieverPtr->GetText((BSTR)System::Runtime::InteropServices::Marshal::StringToBSTR(file).ToPointer());
        text = gcnew String(extractedText);
        retrieverPtr.Release();
    }
    return text;
}

int main(array<System::String^>^ args)
{
    CoInitialize(NULL);
    if (args->Length != 1)
    {
        Console::WriteLine("Missing parameters\nUsage:testCOM <pdf file>");
        return 0;
    }

    String^ text = wrapper(args[0]);
    CoUninitialize();
    Console::WriteLine("Extracted text:");
    Console::WriteLine("---\n{0}", text != nullptr ? text->Trim() : "<empty>");
    Console::WriteLine("---");
    return 0;
}