CPP에서 늦은 바인딩 사용하기

Prerequisites

Aspose.PDF for .NET을 COM Interop로 등록하십시오. Use Aspose.pdf for .NET via COM Interop 문서를 확인해 주세요.

Sample

이것은 COM Interop를 사용하여 PDF에서 텍스트를 추출하기 위한 간단한 C++ 코드 샘플입니다. 자세한 내용은 this 포스트를 참조해 주세요.

#include "stdafx.h"
#include "comdef.h"

using namespace System;

String ^lateBinding(String ^file)
{
    String^ text;
    DISPID dispid;
    DISPPARAMS dp = { NULL, NULL, 0, 0};
    VARIANTARG vargs[1];
    VARIANT arg, result;
    WCHAR str[255];
    CLSID pclsid;

    // ComHelper 생성
    IDispatch* comHelperPtr;

    wcscpy_s(str, L"Aspose.PDF.ComHelper");
    CLSIDFromProgID(str, &pclsid);

    HRESULT hr = CoCreateInstance(pclsid, NULL, CLSCTX_ALL, IID_IDispatch, (void **)&comHelperPtr);
    if (FAILED(hr))
    {
        Console::WriteLine(L"오류 발생");
    }
    else
    {
        // 라이선스 설정
        IDispatch* licPtr;
        wcscpy_s(str, L"Aspose.PDF.License");
        CLSIDFromProgID(str, &pclsid);

        HRESULT hr = CoCreateInstance(pclsid, NULL, CLSCTX_ALL, IID_IDispatch, (void **)&licPtr);

        OLECHAR* setLicense =  L"SetLicense";

        hr = licPtr->GetIDsOfNames(IID_NULL, &setLicense, 1, GetUserDefaultLCID(), &dispid);
        arg.vt = VT_BSTR;

        BSTR lic = SysAllocString(L"C:\\Temp\\Aspose.PDF.lic");

        arg.bstrVal = lic;

        vargs[0] = arg;

        dp.rgvarg = vargs;

        dp.cArgs = 1;

        hr = licPtr->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_METHOD, &dp, &result, NULL, NULL);

        SysFreeString(lic);

        licPtr.Release();

        // 문서 가져오기

        OLECHAR* openFile =  L"OpenFile";

        hr = comHelperPtr->GetIDsOfNames(IID_NULL, &openFile, 1, GetUserDefaultLCID(), &dispid);

        arg.vt = VT_BSTR;

        arg.bstrVal = (BSTR)System::Runtime::InteropServices::Marshal::StringToBSTR(file).ToPointer();

        vargs[0] = arg;

        dp.rgvarg = vargs;

        dp.cArgs = 1;

        hr = comHelperPtr->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_METHOD, &dp, &result, NULL, NULL);

        IDispatch* docPtr = result.pdispVal;

        comHelperPtr.Release();

        //------------------------

        // 문서의 페이지 가져오기

        OLECHAR* pages =  L"Pages";

        hr = docPtr->GetIDsOfNames(IID_NULL, &pages, 1, GetUserDefaultLCID(), &dispid);

        dp.cArgs = 0;

        hr = docPtr->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_PROPERTYGET, &dp, &result, NULL, NULL);

        IDispatch* pagesPtr = result.pdispVal;

        //------------------------

        // Absorber 생성

        IDispatch* absorberPtr;

        wcscpy_s(str, L"Aspose.PDF.Text.TextAbsorber");

        CLSIDFromProgID(str, &pclsid);

        hr = CoCreateInstance(pclsid, NULL, CLSCTX_ALL, IID_IDispatch, (void **)&absorberPtr);

        //------------------------

        // 텍스트 탐색

        arg.vt = VT_DISPATCH;

        arg.pdispVal = absorberPtr;

        vargs[0] = arg;

        dp.rgvarg = vargs;

        dp.cArgs = 1;

        OLECHAR* accept_4 = L"Accept_4";

        hr = pagesPtr->GetIDsOfNames(IID_NULL, &accept_4, 1, GetUserDefaultLCID(), &dispid);

        hr = pagesPtr->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_METHOD, &dp, &result, NULL, NULL);

        //------------------------

        // 텍스트 검색

        OLECHAR* _text = L"Text";

        dp.cArgs = 0;

        hr = absorberPtr->GetIDsOfNames(IID_NULL, &_text, 1, GetUserDefaultLCID(), &dispid);

        hr = absorberPtr->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_PROPERTYGET, &dp, &result, 0, 0);

        //------------------------

        text = gcnew String(result.bstrVal);

        docPtr.Release();

        pagesPtr.Release();

        absorberPtr.Release();

    }

    return text;

}

int main(array<System::String ^> ^args)
{
    if (args->Length != 1)
    {
        Console::WriteLine("매개 변수 누락\n사용법: testCOM <pdf 파일>");
        return 0;
    }

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

}