NXOPEN C++ 在已经打开的装配文件下遍历所有子部件在装配父部件显示的数量，输出结果

可以使用以下代码来实现：

#include <NXOpen/NXException.hxx>
#include <NXOpen/Part.hxx>
#include <NXOpen/Assemblies_Component.hxx>
#include <NXOpen/Assemblies_ComponentAssembly.hxx>
#include <NXOpen/Assemblies_ComponentArray.hxx>
#include <NXOpen/Assemblies_ComponentPosition.hxx>
#include <NXOpen/Assemblies_ComponentOccurrences.hxx>
#include <NXOpen/Assemblies_ComponentLoadStatus.hxx>
#include <iostream>

using namespace NXOpen;

void traverseComponentOccurrences(ComponentOccurrences *occurrences, std::string parentName, int parentCount)
{
    int count = occurrences->GetCount();
    for (int i = 0; i < count; i++)
    {
        ComponentOccurrence *occurrence = occurrences->Get(i);
        if (occurrence != NULL)
        {
            std::string name = occurrence->GetDisplayName();
            int displayCount = occurrence->GetDisplayCount();
            std::cout << "Parent: " << parentName << ", Child: " << name << ", Display Count: " << displayCount * parentCount << std::endl;

            traverseComponentOccurrences(occurrence->GetOccurrences(), name, displayCount * parentCount);
        }
    }
}

extern int ufusr_ask_unload();

extern "C" DllExport int ufusr(char *param, int *retCode, int paramLen)
{
    int errorCode = 0;

    try
    {
        Session *session = Session::GetSession();
        Part *part = session->Parts()->Work();

        if (part->IsFullyLoaded() == false)
        {
            part->Load(BasePart::LoadStatus::LoadFully, NULL);
        }

        ComponentAssembly *assembly = dynamic_cast<ComponentAssembly *>(part->ComponentAssembly());

        if (assembly == NULL)
        {
            throw NXException::Create("The part is not an assembly!");
        }

        ComponentOccurrences *occurrences = assembly->RootComponent()->GetOccurrences();
        traverseComponentOccurrences(occurrences, assembly->DisplayName(), 1);
    }
    catch (const NXException &ex)
    {
        std::cerr << ex.Message() << std::endl;
        errorCode = 1;
    }

    *retCode = errorCode;
    if (errorCode)
    {
        return (UF_EXIT_FAILURE);
    }
    else
    {
        return (UF_EXIT_SUCCESS);
    }
}

这个程序会遍历一个打开的装配文件，输出每个子部件在父部件中显示的数量。其中，`traverseComponentOccurrences` 函数使用递归方式遍历所有的子部件。