无法保留指向内存的指针

这就是我使用Google的pdfium库加载PDF的方式。我收到void*：

doc = FPDF_LoadDocument("media1.pdf", NULL);

现在，我想将此文档保存在FPDF_DOCUMENT的向量中，这基本上是我从上面的代码中收到的void*。这就是我将其保存在向量中的方式：

pdfs.push_back(doc);

问题是，当我出于这种方法的范围时，我无法访问doc指向的记忆。我猜当DOC范围范围范围时，GC会释放该记忆。我知道这个Valgrid调试工具。DOC在命令中声明与命令相同的pdf是。

我基本上想保留已加载的PDF，以便以后可以访问它并从中渲染页面。

valgrind输出：

==4816== 64 bytes in 1 blocks are definitely lost in loss record 175 of 616
==4816==    at 0x4C2A105: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==4816==    by 0x85175B: FPDFBitmap_Create (in /home/ec2-user/Vid/dist/Debug/GNU-MacOSX/video_creator_mount)
==4816==    by 0x4586A1: Blrt::PDFManager::RenderPDFPage(int, int) (PDFManager.cc:159)

以下是pdfmanager中的方法：

std::unique_ptr<Canvas::LoadedPDFInfo> PDFManager::LoadPDF(const std::vector<uint8_t>& data, size_t dataSize)
{
    if(!initPDFIUM) {
        InitPDFIUM();
        currentPDFHandle = 0;
    }
    FPDF_DOCUMENT doc;
   // doc = FPDF_LoadMemDocument(&data[0], dataSize, nullptr);
   doc = FPDF_LoadDocument("media1.pdf", NULL);
    if (!doc) {
      unsigned long err = FPDF_GetLastError();
      fprintf(stderr, "Load pdf docs unsuccessful: ");
      switch (err) {
        case FPDF_ERR_SUCCESS:
          fprintf(stderr, "Success");
          break;
        case FPDF_ERR_UNKNOWN:
          fprintf(stderr, "Unknown error");
          break;
        case FPDF_ERR_FILE:
          fprintf(stderr, "File not found or could not be opened");
          break;
        case FPDF_ERR_FORMAT:
          fprintf(stderr, "File not in PDF format or corrupted");
          break;
        case FPDF_ERR_PASSWORD:
          fprintf(stderr, "Password required or incorrect password");
          break;
        case FPDF_ERR_SECURITY:
          fprintf(stderr, "Unsupported security scheme");
          break;
        case FPDF_ERR_PAGE:
          fprintf(stderr, "Page not found or content error");
          break;
        default:
          fprintf(stderr, "Unknown error %ld", err);
      }
         fprintf(stderr, ".n");
      return nullptr;
    }
    pdfs.push_back(doc);
    //doc = nullptr;
    std::unique_ptr<Canvas::LoadedPDFInfo> pdfInfo(new Canvas::LoadedPDFInfo);
    pdfInfo->handle = ++currentPDFHandle;
    pdfInfo->totalPageNum = FPDF_GetPageCount(doc);
        std::cout << "ERRORn";
    return pdfInfo;
}

pdfs是pdfmanager.h中声明的向量：

namespace Blrt
{
    class PDFManager
    {
        public:
            static std::unique_ptr<Canvas::LoadedPDFInfo> LoadPDF(const std::vector<uint8_t>& data, size_t dataSize);
            static std::unique_ptr<Canvas::TextureData> RenderPDFPage(int32_t pdfHandle, int32_t pageNum);
            static void Dispose();
        private:
            static void InitPDFIUM();
            static void UnsupportedHandler(UNSUPPORT_INFO*, int type);
            static bool initPDFIUM;
            static int32_t currentPDFHandle;
            static std::vector<FPDF_DOCUMENT> pdfs;
            static int32_t nextMultipleOf4(size_t num);
    };
}

以下是我正在访问PDF以访问使用上述方法加载的PDF数据的方法的一部分：

std::unique_ptr<Canvas::TextureData> PDFManager::RenderPDFPage(int32_t pdfHandle, int32_t pageNum)
{
    if (pdfs[pdfHandle-1]) {
        auto pdf = *(pdfs[pdfHandle-1]);
        std::cout << pdfHandle << "    " << pageNum << "    " <<pdfs.size() << "n";
        if (1 <= pageNum && pageNum <= FPDF_GetPageCount(pdf)) {
            auto page = FPDF_LoadPage(pdf, pageNum);
            if(page) {
                auto textPage = FPDFText_LoadPage(page);
                if (textPage) {
                    auto scale = 2.0;
                    auto maxTexSize = VideoCreator::VideoCreator::MaxTextureSize;
                    auto orgWidth = FPDF_GetPageWidth(page);
                    auto orgHeight = FPDF_GetPageHeight(page);
                    auto targetWidth = orgWidth * scale;
                    auto targetHeight = orgHeight * scale;
                    if (targetWidth > targetHeight) {
                        if (targetWidth > maxTexSize) {
                            scale = maxTexSize / targetWidth;
                        }
                    } else {
                        if (targetHeight > maxTexSize) {
                            scale = maxTexSize / targetHeight;
                        }
                    }