- android - 多次调用 OnPrimaryClipChangedListener
- android - 无法更新 RecyclerView 中的 TextView 字段
- android.database.CursorIndexOutOfBoundsException : Index 0 requested, 光标大小为 0
- android - 使用 AppCompat 时,我们是否需要明确指定其 UI 组件(Spinner、EditText)颜色
很多天以来,我一直在尝试解决派生嵌套类的 dll 序列化问题。我已经尝试了很多我发现的例子(即 export_keys ),但我总是遇到运行时错误。访问序列化函数存在一些问题。我写了一个简化的类,类似于我们根据 boost serialization tests (polymorphic_derived2) 使用的类.
//#############dll ###################
//PlugInClass_Derived_2.h//
#pragma once
#ifdef PLUGIN
// All functions in this file are exported
#else
// All functions in this file are imported
#define PLUGIN __declspec(dllimport)
#endif
#include "PlugInClass_Derived_1.h"
class PlugInClass_Derived_2 : public PlugInClass_Derived_1
{
public:
class DLL_DECL(BOOST_PP_EMPTY()) Parameter : public PlugInClass_Derived_1::Parameter
{
public:
Parameter(void);
virtual ~Parameter(void){};
private:
friend class boost::serialization::access;
template <typename Archive>
void serialize(Archive &ar, const unsigned int version);
public:
virtual const char * get_key() const {
return "PlugInClass_Derived_2_Parameter";
}
};
public:
/** @brief standard constructor */
PlugInClass_Derived_2(){};
virtual ~PlugInClass_Derived_2(){};
PLUGIN virtual boost::shared_ptr<PlugInClass_Base::Parameter> getInitParameter();
};
extern "C" PLUGIN PlugInClass_Base* Create(/*void** params, const int number*/);
extern "C" PLUGIN void Destroy(PlugInClass_Base* p);
// we use this because we want to assign a key to this type
// but we don't want to explicitly instantiate code every time
// we do so!!!. If we don't do this, we end up with the same
// code in BOTH the DLL which implements polymorphic_derived2
// as well as the main program.
BOOST_CLASS_EXPORT_KEY(PlugInClass_Derived_2::Parameter)
// note the mixing of type_info systems is supported.
BOOST_CLASS_TYPE_INFO(
PlugInClass_Derived_2::Parameter,
boost::serialization::extended_type_info_typeid<PlugInClass_Derived_2::Parameter>
)
#undef DLL_DECL
//PlugInClass_Derived_2.cpp
/* boost headers go here */
/* plugin headers go here */
#define POLYMORPHIC_DERIVED2_EXPORT
#include "PlugInClass_Derived_2.h"
PlugInClass_Derived_2::Parameter::Parameter(){
d = -2.;
/*nothing*/
}
template <typename Archive>
void PlugInClass_Derived_2::Parameter::serialize(Archive &ar, const unsigned int version)
{
ar & boost::serialization::base_object<PlugInClass_Derived_1::Parameter>(*this);
}
boost::shared_ptr<PlugInClass_Base::Parameter> PlugInClass_Derived_2::getInitParameter(){
// get local data pointer;
boost::shared_ptr<PlugInClass_Base::Parameter> localParameter(new PlugInClass_Derived_2::Parameter());
// update parent information
// return local data
return localParameter;
}
PlugInClass_Base* Create(/*void** params, const int number*/) {
return new PlugInClass_Derived_2();
}
void Destroy(PlugInClass_Base* p) {
delete p;
}
// instantiate code for text archives
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
template EXPORT_DECL(void) PlugInClass_Derived_2::Parameter::serialize(
boost::archive::text_oarchive & ar,
const unsigned int version
);
template EXPORT_DECL(void) PlugInClass_Derived_2::Parameter::serialize(
boost::archive::text_iarchive & ar,
const unsigned int version
);
// instantiate code for polymorphic archives
#include <boost/archive/polymorphic_iarchive.hpp>
#include <boost/archive/polymorphic_oarchive.hpp>
template EXPORT_DECL(void) PlugInClass_Derived_2::Parameter::serialize(
boost::archive::polymorphic_oarchive & ar,
const unsigned int version
);
template EXPORT_DECL(void) PlugInClass_Derived_2::Parameter::serialize(
boost::archive::polymorphic_iarchive & ar,
const unsigned int version
);
// MWerks users can do this to make their code work
BOOST_SERIALIZATION_MWERKS_BASE_AND_DERIVED(
PlugInClass_Derived_1::Parameter
, PlugInClass_Derived_2::Parameter)
// note: export has to be AFTER #includes for all archive classes
BOOST_CLASS_EXPORT_IMPLEMENT(PlugInClass_Derived_2::Parameter)
//PlugInClass_Derived_1.h
#pragma once
#ifdef PLUGIN
// All functions in this file are exported
#else
// All functions in this file are imported
#define PLUGIN __declspec(dllimport)
#endif
#include "PlugInClass_Base.h"
class PlugInClass_Derived_1 : public PlugInClass_Base
{
public:
class DLL_DECL(BOOST_PP_EMPTY()) Parameter : public PlugInClass_Base::Parameter
{
public:
int a, b, c;
Parameter(void);
virtual ~Parameter(void){};
private:
friend class boost::serialization::access;
template <typename Archive>
void serialize(Archive &ar, const unsigned int version);
public:
virtual const char * get_key() const {
return "PlugInClass_Derived_1_Parameter";
}
};
public:
/** @brief standard constructor */
PlugInClass_Derived_1(){};
virtual ~PlugInClass_Derived_1(){};
virtual boost::shared_ptr<PlugInClass_Base::Parameter> getInitParameter();
};
// we use this because we want to assign a key to this type
// but we don't want to explicitly instantiate code every time
// we do so!!!. If we don't do this, we end up with the same
// code in BOTH the DLL which implements polymorphic_derived2
// as well as the main program.
BOOST_CLASS_EXPORT_KEY(PlugInClass_Derived_1::Parameter)
// note the mixing of type_info systems is supported.
BOOST_CLASS_TYPE_INFO(
PlugInClass_Derived_1::Parameter,
boost::serialization::extended_type_info_typeid<PlugInClass_Derived_1::Parameter>
)
//PlugInClass_Derived_1.cpp
/* boost headers go here */
/* plugin headers go here */
#define POLYMORPHIC_DERIVED2_EXPORT
#include "PlugInClass_Derived_1.h"
PlugInClass_Derived_1::Parameter::Parameter():
a(1),
b(2),
c(3)
{
d = -1.;
/*nothing*/
}
template <typename Archive>
void PlugInClass_Derived_1::Parameter::serialize(Archive &ar, const unsigned int version)
{
ar & boost::serialization::base_object<PlugInClass_Base::Parameter>(*this);
ar & a;
ar & b;
ar & c;
}
boost::shared_ptr<PlugInClass_Base::Parameter> PlugInClass_Derived_1::getInitParameter(){
// get local data pointer;
boost::shared_ptr<PlugInClass_Base::Parameter> localParameter(new PlugInClass_Derived_1::Parameter());
// update parent information
// return local data
return localParameter;
}
// instantiate code for text archives
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
template EXPORT_DECL(void) PlugInClass_Derived_1::Parameter::serialize(
boost::archive::text_oarchive & ar,
const unsigned int version
);
template EXPORT_DECL(void) PlugInClass_Derived_1::Parameter::serialize(
boost::archive::text_iarchive & ar,
const unsigned int version
);
// instantiate code for polymorphic archives
#include <boost/archive/polymorphic_iarchive.hpp>
#include <boost/archive/polymorphic_oarchive.hpp>
template EXPORT_DECL(void) PlugInClass_Derived_1::Parameter::serialize(
boost::archive::polymorphic_oarchive & ar,
const unsigned int version
);
template EXPORT_DECL(void) PlugInClass_Derived_1::Parameter::serialize(
boost::archive::polymorphic_iarchive & ar,
const unsigned int version
);
// MWerks users can do this to make their code work
BOOST_SERIALIZATION_MWERKS_BASE_AND_DERIVED(
PlugInClass_Base::Parameter
, PlugInClass_Derived_1::Parameter)
// note: export has to be AFTER #includes for all archive classes
BOOST_CLASS_EXPORT_IMPLEMENT(PlugInClass_Derived_1::Parameter)
//PlugInClass_Base.h
#pragma once
#ifdef PLUGIN
// All functions in this file are exported
#else
// All functions in this file are imported
#define PLUGIN __declspec(dllimport)
#endif
// boost headers
#include <boost/serialization/serialization.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/serialization/vector.hpp>
#include <boost/serialization/export.hpp>
#include <boost/serialization/base_object.hpp>
#include <boost/serialization/shared_ptr.hpp>
#include <boost/serialization/assume_abstract.hpp>
#include <boost/serialization/tracking.hpp>
#include <boost/serialization/access.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/access.hpp>
#include <boost/serialization/type_info_implementation.hpp>
#include <boost/serialization/extended_type_info_no_rtti.hpp>
#include <boost/serialization/extended_type_info_typeid.hpp>
#include <boost/preprocessor/empty.hpp>
// export_decl, import_decl from http://www.boost.org/doc/libs/1_55_0/libs/serialization/test/
#ifdef BOOST_HAS_DECLSPEC // defined in config system
#if ! defined(EXPORT_DECL)
#if defined(__BORLANDC__)
#define EXPORT_DECL(T) T __export
#else
#define EXPORT_DECL(T) __declspec(dllexport) T
#endif
#endif
#if ! defined(IMPORT_DECL)
#if defined(__BORLANDC__)
#define IMPORT_DECL(T) T __import
#else
#define IMPORT_DECL(T) __declspec(dllimport) T
#endif
#endif
#else
#define IMPORT_DECL(T) T
#define EXPORT_DECL(T) T
#endif // BOOST_HAS_DECLSPEC
#if defined(POLYMORPHIC_DERIVED_IMPORT)
#define DLL_DECL IMPORT_DECL
#elif defined(POLYMORPHIC_DERIVED_EXPORT)
#define DLL_DECL EXPORT_DECL
#else
#define DLL_DECL(x)
#endif
class PlugInClass_Base
{
public:
class DLL_DECL(BOOST_PP_EMPTY()) Parameter
{
public:
double d;
virtual ~Parameter(void){};
private:
friend class boost::serialization::access;
template <typename Archive>
void serialize(Archive &ar, const unsigned int version){
ar & d;
};
public:
virtual const char * get_key() const = 0;
};
public:
/** @brief standard constructor */
PlugInClass_Base(){};
virtual ~PlugInClass_Base(){};
PLUGIN virtual boost::shared_ptr<PlugInClass_Base::Parameter> getInitParameter(){return NULL;};
};
BOOST_SERIALIZATION_ASSUME_ABSTRACT(PlugInClass_Base::Parameter)
// we use this because we want to assign a key to this type
// but we don't want to explicitly instantiate code every time
// we do so!!!. If we don't do this, we end up with the same
// code in BOTH the DLL which implements polymorphic_derived2
// as well as the main program.
BOOST_CLASS_EXPORT_KEY(PlugInClass_Base::Parameter)
// note the mixing of type_info systems is supported.
BOOST_CLASS_TYPE_INFO(
PlugInClass_Base::Parameter,
boost::serialization::extended_type_info_typeid<PlugInClass_Base::Parameter>
)
///######### dll 结束 ###################///
//至少是主要的
#include <stdio.h>
#include <tchar.h>
#include <fstream>
#include <sstream>
#include <boost/serialization/serialization.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/serialization/vector.hpp>
#include <boost/serialization/export.hpp>
#include <boost/serialization/base_object.hpp>
#include <boost/serialization/shared_ptr.hpp>
#include <boost/serialization/assume_abstract.hpp>
#include <boost/serialization/tracking.hpp>
#include <boost/serialization/access.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/access.hpp>
#include <boost/serialization/type_info_implementation.hpp>
#include <boost/serialization/extended_type_info_no_rtti.hpp>
#include "PlugIn_Derived\PlugInClass_Base.h"
#include <windows.h>
int main(int argc, char** argv)
{
boost::shared_ptr<PlugInClass_Base> dll_;
/// ######### load dll ################### ///
std::string pluginPath_ = "PlugInClass_Derived_2.dll";
HINSTANCE currLibrary = LoadLibrary(pluginPath_.c_str());
if (!currLibrary) {
throw std::runtime_error("The plugin could not be loaded.");
}
// load the plugin class interface from the library using its factory functions
typedef PlugInClass_Base *(*CreatePluginFuncDef)();
CreatePluginFuncDef pluginCreateFactoryPtr = (CreatePluginFuncDef)GetProcAddress(currLibrary, "Create");
typedef void(*DestroyPluginFuncDef)(PlugInClass_Base*);
DestroyPluginFuncDef pluginDestroyPtr = (DestroyPluginFuncDef)GetProcAddress(currLibrary, "Destroy");
// create object within dll
dll_ = boost::shared_ptr<PlugInClass_Base>(pluginCreateFactoryPtr(), pluginDestroyPtr);
/// ######### get object from dll ################### ///
boost::shared_ptr<PlugInClass_Base::Parameter> parameterPtr = dll_->getInitParameter();
/// ######### serialization ################### ///
std::string s;
// create and open a character archive for output
{
std::ostringstream os;
// save data to archive
boost::archive::text_oarchive oa(os);
// write class instance to archive
oa << parameterPtr; // HERE RUNTIME ERROR
// Unhandled exception at xxxx in test_dll_simple_example.exe:
// Microsoft C++ exception: boost::archive::archive_exception at memory location xxxx
s = os.str();
}
// ... some time later restore the class instance to its orginal state
std::system("pause");
return 0;
}
如您所见,我想要的类始终是一个嵌套类“Parameter”,定义在“dll”接口(interface) (PlugInClass_Base) 的派生类中,并派生自基类的参数类(即 PlugInClass_Derived_1::Parameter)。 dll 函数“getInitParameter”返回指向我们要存储的参数类的基类的基指针。
你能看出我在连载过程中做错了什么吗?如果你能给我一些提示,我会很高兴。
亚历山德罗斯。
最佳答案
我发现,如果将基指针转换为派生指针,则序列化有效。
/// ######### get object from dll ################### ///
boost::shared_ptr<PlugInClass_Base::Parameter> parameterPtr = dll_->getInitParameter();
boost::shared_ptr<PlugInClass_Derived_2::Parameter> derivedParameterPtr = boost::static_pointer_cast<PlugInClass_Derived_2::Parameter>(parameterPtr);
/// ######### serialization ################### ///
std::string s;
// create and open a character archive for output
{
std::ostringstream os;
// save data to archive
boost::archive::text_oarchive oa(os);
oa << derivedParameterPtr; // It works !!!
s = os.str();
}
因此,序列化无法通过基指针中的所有派生指针。基类是一个抽象类
(BOOST_SERIALIZATION_ASSUME_ABSTRACT(PlugInClass_Base::Parameter))
并且 key 被导出
BOOST_CLASS_EXPORT_KEY(PlugInClass_Base::Parameter)
并且导出每个派生类的实现(在cpp文件中)
BOOST_CLASS_EXPORT_IMPLEMENT(PlugInClass_Derived_1::Parameter)
嵌套类的键有问题吗?否则所有派生类都有自己的 get_key() 函数。
有什么假设吗?
关于c++ - 在 dll 中定义的派生嵌套类的序列化,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26218507/
我是 python 的新手。我试图找到我的文本的频率分布。这是代码, import nltk nltk.download() import os os.getcwd() text_file=open(
我对安卓 fragment 感到困惑。我知道内存 fragment 但无法理解什么是 android fragment 问题。虽然我发现很多定义,比如 Android fragmentation re
尝试对 WordPress 进行 dockerise 我发现了这个场景: 2个数据卷容器,一个用于数据库(bbdd),另一个用于wordpress文件(wordpress): sudo docker
这个问题已经有答案了: From the server is there a way to know that my page is being loaded in an Iframe (1 个回答)
我正在玩小型服务器,试图对运行在其上的服务进行docker化。为简化起见,假设我必须主要处理:Wordpress和另一项服务。 在Docker集线器上有许多用于Wordpress的图像,但是它们似乎都
我想要发生的是,当帐户成功创建后,提交的表单应该消失,并且应该出现一条消息(取决于注册的状态)。 如果成功,他们应该会看到一个简单的“谢谢。请检查您的电子邮件。” 如果不是,那么他们应该会看到一条适当
就是这样,我需要为客户添加一个唯一标识符。通过 strip 元数据。这就是我现在完全构建它的方式,但是我只有最后一部分告诉我用户购买了哪个包。 我试着看这里: Plans to stripe 代码在这
我有一个类将执行一些复杂的操作,涉及像这样的一些计算: public class ComplexAction { public void someAction(String parameter
这个问题已经有答案了: maven add a local classes directory to module's classpath (1 个回答) 已关闭10 年前。 我有一些不应更改的旧 E
我使用 fragment 已经有一段时间了,但我经常遇到一个让我烦恼的问题。 fragment 有时会相互吸引。现在,我设法为此隔离了一个用例,它是这样的: Add fragment A(也使用 ad
我的 html 中有一个 ol 列表,上面有行条纹。看起来行条纹是从数字后面开始的。有没有办法让行条纹从数字开始? 我已经包含了正在发生的事情的片段 h4:nth-child(even) {
如何仅使用 css 将附加图像 html 化? 如果用纯 css 做不到,那我怎么能至少用一个图像来做 最佳答案 这不是真正的问题,而是您希望我们为您编写代码。我建议您搜索“css breadcrum
以下是 Joshua 的 Effective Java 的摘录: If you do synchronize your class internally, you can use various te
在这里工作时,我们有一个框向业务合作伙伴提供 XML 提要。对我们的提要的请求是通过指定查询字符串参数和值来定制的。其中一些参数是必需的,但很多不是。 例如,我们要求所有请求都指定一个 GUID 来标
我有 3 个缓冲区,其中包含在 32 位处理器上运行的 R、G、B 位数据。 我需要按以下方式组合三个字节: R[0] = 0b r1r2r3r4r5r6r7r8 G[0] = 0b g1g2g3g4
我最近发现了关于如何使用 History.js、jQuery 和 ScrollTo 通过 HTML5 History API 对网站进行 Ajax 化的要点:https://github.com/br
我们有一个 Spring Boot 应用程序,由于集成需要,它变得越来越复杂——比如在你这样做之后发送一封电子邮件,或者在你之后广播一条 jms 消息等等。在寻找一些更高级别的抽象时,我遇到了 apa
我正在尝试首次实施Google Pay。我面临如何指定gateway和gatewayMarchantId的挑战。 我所拥有的是google console帐户,不知道在哪里可以找到此信息。 priva
昨天下午 3 点左右,我为两个想要从一个 Azure 帐户转移到另一个帐户的网站设置了 awverify 记录。到当天结束时,Azure 仍然不允许我添加域,所以我赌了一把,将域和 www 子域重新指
我正在使用terms facet在elasticsearch服务器中获取顶级terms。现在,我的标签"indian-government"不被视为一个标签。将其视为"indian" "governm
我是一名优秀的程序员,十分优秀!