如何删除指针数组

Question

我一直在刷我的C++,我有一个关于删除新内存的快速问题.正如您在下面看到的,我有一个包含FileData*列表的简单类.我创建了一个数组来保存要推送到列表中的FileData对象.当ReportData被破坏时,我遍历列表并删除每个元素.我的问题是,当我使用reportData时,如何删除数组,以便我没有任何内存泄漏？

Report.h

class REPORTAPI ReportData {
public:

        ReportData()
        {
        }

        virtual ~ReportData()
        {
                printf("Starting ReportData Delete\n");
                for (list<FileData*>::iterator i = ReportFileData.begin(), e = ReportFileData.end(); i != e; )
                {
                    list<FileData*>::iterator tmp(i++);
                    delete *tmp;
                    ReportFileData.erase(tmp);
                }

                for (list<SupressionData*>::iterator i = ReportSupressionData.begin(), e = ReportSupressionData.end(); i != e; )
                {
                    list<SupressionData*>::iterator tmp(i++);
                    delete *tmp;
                    ReportSupressionData.erase(tmp);
                }

                ReportFileData.clear();
                ReportSupressionData.clear();

                printf("Finished ReportData Delete\n");
        }

        list<FileData *> ReportFileData;
        list<SupressionData *> ReportSupressionData;
}


extern "C" __declspec(dllexport) FileData* __stdcall createFileData(string fileName, long recordCount, long addPageCount)
{
        return new FileData(fileName, recordCount, addPageCount);
}

Main.cpp的

        ReportData *reportData = createrd();

        if (reportData != NULL)
        {
                CreateFileDataFunc createfd (reinterpret_cast<CreateFileDataFunc>(GetProcAddress (dll, "createFileData")));

                const int num_files = 5;
                FileData *fileData[num_files];

                char buff[256] = {'\0'};
                for (int i = 0; i < num_files; i++)
                {
                        sprintf(buff, "test: %d", i);
                        fileData[i] = createfd(buff, 1, 1);
                        reportData->ReportFileData.push_back(fileData[i]);
                }

                delete reportData;
                reportData = NULL;

                delete [] fileData; // this is throwing an access violation error:
                                    //EAccessViolation: 'Access violation at address 326025AF. Write of address 00000008'.


        }

---我从ReportData dtor中删除了删除操作,现在我正在循环和删除:

            for(int i = 0; i < num_files; i++)
            {
                delete fileData[i];
            }

这更容易理解,然后必须依靠单独的对象的dtor来清理内存.

Answer 1

你没有.fileData是一个自动(堆栈)变量.您没有使用new分配它,因此不要删除它.

[编辑:我也不确定,但我认为你可能会遇到从main.cpp删除那些FileData对象的问题,考虑到它们是在某些dll中分配的.dll是否提供了删除功能？]