c ++ boost将char数组反序列化为obj

Posted 2023-02-21

【中文标题】c ++ boost将char数组反序列化为obj

【英文标题】：c++ boost deserialize char array into an obj

【发布时间】：2018-04-04 16:56:56

【问题描述】：

在 boost 公交时刻表示例代码中。bus schedule sample 我尝试反序列化 char 数组中的数据。所以我添加了这个功能。但它有这个错误。怎么了？

void frombuffer_schedule(char* buffer,const bus_schedule& obj)
     
    boost::iostreams::stream<boost::iostreams::array_source>  is(buffer, 4096);
    boost::archive::binary_iarchive ia(is,boost::archive::archive_flags::no_header);
    ia >> obj;

错误是“错误：静态断言失败：typex::value”

【问题讨论】：

你使用的是什么版本的 boost？该静态断言位于哪个文件和行号？

【参考方案1】：

您正在反序列化为 const 对象。以下是该失败断言的实际代码：

// cannot load data into a "const" object unless it's a
// wrapper around some other non-const object.
BOOST_STATIC_ASSERT(typex::value);

所以，修复它:)

Live On Coliru

#include <boost/serialization/string.hpp>
#include <boost/serialization/serialization.hpp>

struct MyData 
    std::string s;
    float values[7];

  private:
    friend class boost::serialization::access;
    template <typename Ar>
    void serialize(Ar& ar, unsigned)  ar & s & values; 
;

#include <boost/iostreams/device/array.hpp>
#include <boost/iostreams/device/back_inserter.hpp>
#include <boost/iostreams/stream.hpp>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
namespace bio = boost::iostreams;

std::vector<char> to_buffer(const MyData& obj)      
    std::vector<char> buffer;

    bio::stream<bio::back_insert_device<std::vector<char> > > os(buffer);

    namespace ba = boost::archive;
    ba::binary_oarchive oa(os, ba::archive_flags::no_header);

    oa << obj;
    return buffer;


void from_buffer(char* buffer, MyData& obj)      
    bio::stream<bio::array_source> is(buffer, 4096);

    namespace ba = boost::archive;
    ba::binary_iarchive ia(is, ba::archive_flags::no_header);

    ia >> obj;


#include <iostream>
#include <iomanip>

static inline std::ostream& operator<<(std::ostream& os, MyData const& object) 
    os << "s:" << std::quoted(object.s) << ", values:[";
    for (float v : object.values)
        os << " " << v;
    return os << " ]";


int main() 
    auto buffer = to_buffer(MyData  "hello world",  1,2,3,4,5,6,7  );

    MyData received;
    from_buffer(buffer.data(), received);

    std::cout << "Received: " << received << "\n";

打印

Received: s:"hello world", values:[ 1 2 3 4 5 6 7 ]