无法反序列化 std::list<std::string>

Posted 2023-02-21

【中文标题】无法反序列化 std::list<std::string>

【英文标题】：Cannot deserialize std::list<std::string>

【发布时间】：2014-05-26 15:21:10

【问题描述】：

#include <boost/serialization/list.hpp>
#include <boost/serialization/string.hpp>
class SerializableSmth 

    friend class boost::serialization::access;
    private:
        std::list<std::string> data;
        template<class Archive> void serialize(Archive & ar, unsigned int version)
        
            ar & data;
        
;
BOOST_CLASS_VERSION(SerializableSmth, 1);

问题初探：当data 包含超过~7 个字符的字符串时，它不能被序列化回来。序列化的 text_oarchive 如下所示：

22 serialiation::archive 10 0 1 0 0 2 0 5 test1 13 test2-914166-

（当 test2- 缩短为 5 test2- 时，可以正常工作）。

---

当使用text_oarchive 而不是std::stringstream 进行序列化并使用boost::iostreams::basic_array 进行反序列化时会发生这种情况。

【问题讨论】：

boost::iostreams::basic_array?怎么样？

【参考方案1】：

在输出和输入档案上设置boost::archive::no_header | boost::archive::no_codecvt 标志似乎解决了这个问题。

【讨论】：

+1 有趣的东西。我其实不知道这些存档标志

【参考方案2】：

我无法重现它，但也许这个 SSCCE 可以帮助您发现问题：

看Live On Coliru

#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/serialization/list.hpp>
#include <boost/serialization/string.hpp>

#include <boost/iostreams/device/array.hpp>
#include <boost/iostreams/stream.hpp>

#include <sstream>

class SerializableSmth 

    public:
    void init() 
        for  (int i=0; i<100; ++i) 
            data.push_back("Some fairly long string " + std::to_string(i) + " with a number");
        
    
    friend class boost::serialization::access;

    std::list<std::string> data;
    template<class Archive> void serialize(Archive & ar, unsigned int version)
    
        ar & data;
    
;

BOOST_CLASS_VERSION(SerializableSmth, 1);

#include <iostream>

int main()

    std::string serialized;
    
        std::stringstream ss;
        boost::archive::text_oarchive oa(ss);

        SerializableSmth original;
        original.init();

        oa << original;

        serialized = ss.str();
    

    
        boost::iostreams::basic_array_source<char> as(serialized.data(), serialized.size());
        boost::iostreams::stream<boost::iostreams::basic_array_source<char> > is(as);

        // now let's see it back:
        boost::archive::text_iarchive ia(is);

        SerializableSmth cloned;
        ia >> cloned;
        std::cout << "Cloned data has " << cloned.data.size() << " records\n";
    

打印

Cloned data has 100 records

如预期的那样

序列化的数据是单行~4.5kB：

22 serialization::archive 10 0 1 0 0 100 0 39 Some fairly long string 0 with a number 39 Some fairly long string 1 with a number 39 Some fairly long string 2 with a number 39 Some fairly long string 3 with a number 39 Some fairly long string 4 with a number 39 Some fairly long string 5 with a number 39 Some fairly long string 6 with a number 39 Some fairly long string 7 with a number 39 Some fairly long string 8 with a number 39 Some fairly long string 9 with a number 40 Some fairly long string 10 with a number 40 Some fairly long string 11 with a number 40 Some fairly long string 12 with a number 40 Some fairly long string 13 with a number 40 Some fairly long string 14 with a number 40 Some fairly long string 15 with a number 40 Some fairly long string 16 with a number 40 Some fairly long string 17 with a number 40 Some fairly long string 18 with a number 40 Some fairly long string 19 with a number 40 Some fairly long string 20 with a number 40 Some fairly long string 21 with a number 40 Some fairly long string 22 with a number 40 Some fairly long string 23 with a number 40 Some fairly long string 24 with a number 40 Some fairly long string 25 with a number 40 Some fairly long string 26 with a number 40 Some fairly long string 27 with a number 40 Some fairly long string 28 with a number 40 Some fairly long string 29 with a number 40 Some fairly long string 30 with a number 40 Some fairly long string 31 with a number 40 Some fairly long string 32 with a number 40 Some fairly long string 33 with a number 40 Some fairly long string 34 with a number 40 Some fairly long string 35 with a number 40 Some fairly long string 36 with a number 40 Some fairly long string 37 with a number 40 Some fairly long string 38 with a number 40 Some fairly long string 39 with a number 40 Some fairly long string 40 with a number 40 Some fairly long string 41 with a number 40 Some fairly long string 42 with a number 40 Some fairly long string 43 with a number 40 Some fairly long string 44 with a number 40 Some fairly long string 45 with a number 40 Some fairly long string 46 with a number 40 Some fairly long string 47 with a number 40 Some fairly long string 48 with a number 40 Some fairly long string 49 with a number 40 Some fairly long string 50 with a number 40 Some fairly long string 51 with a number 40 Some fairly long string 52 with a number 40 Some fairly long string 53 with a number 40 Some fairly long string 54 with a number 40 Some fairly long string 55 with a number 40 Some fairly long string 56 with a number 40 Some fairly long string 57 with a number 40 Some fairly long string 58 with a number 40 Some fairly long string 59 with a number 40 Some fairly long string 60 with a number 40 Some fairly long string 61 with a number 40 Some fairly long string 62 with a number 40 Some fairly long string 63 with a number 40 Some fairly long string 64 with a number 40 Some fairly long string 65 with a number 40 Some fairly long string 66 with a number 40 Some fairly long string 67 with a number 40 Some fairly long string 68 with a number 40 Some fairly long string 69 with a number 40 Some fairly long string 70 with a number 40 Some fairly long string 71 with a number 40 Some fairly long string 72 with a number 40 Some fairly long string 73 with a number 40 Some fairly long string 74 with a number 40 Some fairly long string 75 with a number 40 Some fairly long string 76 with a number 40 Some fairly long string 77 with a number 40 Some fairly long string 78 with a number 40 Some fairly long string 79 with a number 40 Some fairly long string 80 with a number 40 Some fairly long string 81 with a number 40 Some fairly long string 82 with a number 40 Some fairly long string 83 with a number 40 Some fairly long string 84 with a number 40 Some fairly long string 85 with a number 40 Some fairly long string 86 with a number 40 Some fairly long string 87 with a number 40 Some fairly long string 88 with a number 40 Some fairly long string 89 with a number 40 Some fairly long string 90 with a number 40 Some fairly long string 91 with a number 40 Some fairly long string 92 with a number 40 Some fairly long string 93 with a number 40 Some fairly long string 94 with a number 40 Some fairly long string 95 with a number 40 Some fairly long string 96 with a number 40 Some fairly long string 97 with a number 40 Some fairly long string 98 with a number 40 Some fairly long string 99 with a number