استخدام الربط المتأخر في CPP

المتطلبات الأساسية

يرجى تسجيل Aspose.PDF لـ .NET مع COM Interop، يرجى التحقق من المقالة التي تحمل اسم استخدام Aspose.pdf لـ .NET عبر COM Interop.

عينة

هذه عينة بسيطة من كود C++ لاستخراج نص من PDF من خلال COM Interop باستخدام الربط المتأخر. للتفاصيل يرجى النظر في هذا المنشور.

#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;

    // create ComHelper
    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"حدث خطأ");
    }
    else
    {
        // set license
        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();

        // get Document

        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();

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

        // get Pages for the Document

        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;

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

        // create Absorber

        IDispatch* absorberPtr;

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

        CLSIDFromProgID(str, &pclsid);

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

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

        // browse text

        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);

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

        // retrieve text

        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("المعلمات المفقودة\nUsage:testCOM <pdf file>");
        return 0;
    }

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

}