c++ - Boost 序列化在特定文件大小后抛出 "input stream error"

Question

我正在使用 Boost::serialization 读取/写入包含 3d 模型的文件。

文件达到一定大小(大约 8-12kb+)后，每次我尝试读取文件时，序列化都会抛出“输入流错误”异常。直到那时它每次都工作正常 - 例如我可以成功读/写 1kb 模型 12 次，然后在第 13 次及以后它会抛出异常!

这是序列化/反序列化的代码:

    JonsPackagePtr ReadJonsPkg(const std::string& jonsPkgName)
    {
        std::ifstream jonsPkgStream(jonsPkgName.c_str(), std::fstream::binary || std::fstream::in);
        JonsPackagePtr pkg(new JonsPackage());   // "JonsPackagePtr" is a boost_shared_ptr typedef

        if (jonsPkgStream && jonsPkgStream.good() && jonsPkgStream.is_open())
        {
            boost::archive::binary_iarchive iar(jonsPkgStream);

            iar >> (*pkg.get());
        }

        return pkg;
    }

    bool WriteJonsPkg(const std::string& jonsPkgName, const JonsPackagePtr pkg)
    {
        std::ofstream outStream(jonsPkgName.c_str(), std::fstream::out | std::fstream::binary);
        bool ret = false;

        if (outStream.is_open())
        {
            boost::archive::binary_oarchive oar(outStream);
            oar << (*pkg.get());

            ret = true;
        }

        return ret;
    }

这是我存档的内容:

/* PackageHeader definition */
    struct PackageHeader
    {
        std::string mSignature;
        uint8_t mMajorVersion;
        uint8_t mMinorVersion;


        PackageHeader();
    };

    /* PackageMesh definition */
    struct PackageMesh
    {
        std::vector<float> mVertexData;
        std::vector<uint32_t> mIndiceData;


        PackageMesh();
    };

    /* PackageModel definition */
    struct PackageModel
    {
        std::string mName;
        std::vector<PackageModel> mChildren;
        std::vector<PackageMesh> mMeshes;
        Mat4 mTransform;


        PackageModel();
    };

    /* JonsPackage definition */
    struct JonsPackage
    {
        PackageHeader mHeader;
        std::vector<PackageModel> mModels;


        JonsPackage();
    };


    typedef boost::shared_ptr<JonsPackage> JonsPackagePtr;
    JonsPackagePtr ReadJonsPkg(const std::string& jonsPkgName);
    bool WriteJonsPkg(const std::string& jonsPkgName, const JonsPackagePtr pkg);


    /* PackageHeader inlines */
    inline PackageHeader::PackageHeader() : mSignature("jons"), mMajorVersion(LatestMajorVersion), mMinorVersion(LatestMinorVersion)
    {
    }

    /* PackageModel inlines */
    inline PackageModel::PackageModel() : mName(""), mTransform(1.0f)
    {
    }

    /* PackageMesh inlines */
    inline PackageMesh::PackageMesh()
    {
    }

    /* JonsPackage inlines */
    inline JonsPackage::JonsPackage()
    {
    }

最后是我的非侵入式序列化定义:

namespace boost
{
    namespace serialization
    {
        template<class Archive>
        void serialize(Archive & ar, JonsEngine::PackageHeader& header, const unsigned int version)
        {
            ar & header.mMajorVersion;
            ar & header.mMinorVersion;
            ar & header.mSignature;
        }

        template<class Archive>
        void serialize(Archive & ar, JonsEngine::PackageModel& model, const unsigned int version)
        {
            ar & model.mName;
            ar & model.mChildren;
            ar & model.mMeshes;
            ar & model.mTransform;
        }

        template<class Archive>
        void serialize(Archive & ar, JonsEngine::PackageMesh& mesh, const unsigned int version)
        {
            ar & mesh.mVertexData;
            ar & mesh.mIndiceData;
        }

        template<class Archive>
        void serialize(Archive & ar, JonsEngine::JonsPackage& pkg, const unsigned int version)
        {
            ar & pkg.mHeader;
            ar & pkg.mModels;
        }

        template<class Archive>
        void serialize(Archive & ar, glm::detail::tmat4x4<glm::mediump_float> transform, const unsigned int version)
        {
            ar & transform[0];
            ar & transform[1];
            ar & transform[2];
            ar & transform[3];
        }

        template<class Archive>
        void serialize(Archive & ar, glm::detail::tvec4<glm::mediump_float> vec, const unsigned int version)
        {
            ar & vec.x;
            ar & vec.y;
            ar & vec.z;
            ar & vec.w;
        }
    } // namespace serialization
} // namespace boost

正如我上面提到的，只有在一定的文件大小 (8-12kb+) 之后，当我尝试读取它时，它才会开始抛出异常。到底为什么会这样，可能会发生什么造成吗？到现在为止一切正常...

谢谢

Answer 1

在 ReadJonsPkg 中你应该使用按位或:std::fstream::binary | std::fstream::in