Question

当我尝试反序列化二进制数据时，我得到了这个：

异常：内存位置的boost :: archive :: archive_exception

写：

std::ofstream ofs(savePath);
boost::archive::binary_oarchive out_arch(ofs);
out_arch << mData;
ofs.close();

读：

std::ifstream ifs(loadPath);
boost::archive::binary_iarchive in_arch(ifs);
in_arch >> _mData;

当我使用text_iarchive \ text_oarchive正常工作时。

序列化数据结构mData是ColorMatrix<std::map<int, float>> mData;

#include <algorithm>
#include <memory>
#include <boost/serialization/vector.hpp>

template<class T, class A = std::allocator<T> >
struct ColorMatrix {
    typedef T value_type;
    typedef std::vector<value_type, A> Container;

    ColorMatrix() : _b(0) {}
    ColorMatrix(int a, int b, value_type const& initial = value_type())
        : _b(0)
    {
        resize(a, b, initial);
    }
    ColorMatrix(ColorMatrix const& other)
        : _data(other._data), _b(other._b)
    {}

    ColorMatrix& operator=(ColorMatrix copy) {
        swap(*this, copy);
        return *this;
    }

    bool empty() const { return _data.empty(); }
    void clear() { _data.clear(); _b = 0; }

    int dim_a() const { return _b ? _data.size() / _b : 0; }
    int dim_b() const { return _b; }

    value_type* operator[](int a) {
        return &_data[a * _b];
    }
    value_type const* operator[](int a) const {
        return &_data[a * _b];
    }

    void resize(int a, int b, value_type const& initial = value_type()) {
        if (a == 0) {
            b = 0;
        }
        _data.resize(a * b, initial);
        _b = b;
    }

    void copyTo(ColorMatrix<T, A> &other){

        int myA = dim_a();
        int myB = dim_b();
        int otherB = other.dim_b();

        for (int line = 0; line < myA; ++line){
            int myStart = line * myB;
            int myEnd = (line + 1) * myB;
            int otherStart = line*otherB;

            std::cout << "Line: " << line << " S1: " << myStart << " E1: " << myEnd << " S2: " << otherStart << std::endl;

            std::copy(_data.begin() + myStart,
                _data.begin() + myEnd,
                other._data.begin() + otherStart);
        }
    }

    friend void swap(ColorMatrix& a, ColorMatrix& b) {
        using std::swap;
        swap(a._data, b._data);
        swap(a._b, b._b);
    }


private:
    Container _data;
    int _b;

    friend class boost::serialization::access;

    template<class Archive>
    void serialize(Archive & ar, const unsigned int version)
    {
        ar & _data;
        ar & _b;
    }
};

UPD1

我在序列化步骤中发现了一个问题。测试数据都可以。

测试代码所有ok：

#include <iostream>
#include <vector>
#include <math.h>
#include <fstream>
#include <map>
#include <fstream>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/serialization/map.hpp>
#include "ColorMatrix.h"

using namespace std;

int main()
{
    cout << "start program" << endl;
    ColorMatrix<std::map<int, float>> mData;
    ColorMatrix<std::map<int, float>> mData2;

    const int mSize = 200;

    mData.resize(mSize, mSize);

    cout << "init" << endl;
    for (int x = 0; x < mSize; x++){
        for (int y = 0; y < mSize; y++){
            if (y % 2 == 0){
                mData[x][y][0] = 1.f;
                mData[x][y][1] = 0.66666f;
            }
            else if (y % 3 == 0){
                mData[x][y][0] = 1.f;
                mData[x][y][1] = 0.1111111111f;
                mData[x][y][3] = 0.44444444f;
            }
            else{
                mData[x][y][0] = 1.f;
            }

        }
    }

    cout << "write data" << endl;
    std::ofstream ofs("data.dat");
    boost::archive::binary_oarchive out_arch(ofs);
    //boost::archive::text_oarchive out_arch(ofs);
    out_arch << mData;
    ofs.close();

    cout << "read data" << endl;
    std::ifstream ifs("data.dat");
    if (!ifs) {
        cout << "read error!" << endl;
        return 1;
    }

    boost::archive::binary_iarchive in_arch(ifs);
    //boost::archive::text_iarchive in_arch(ifs);
    in_arch >> mData2;
    cout << "complete" << endl;
    return 0;
}

Answer 1

两个提示

确保档案的生命周期已关闭，特别是不重叠
文本存档工作的事实让我想知道你是否正在编写二进制流。另请注意，您可以不在Boost序列化中安全地将多个归档连接到同一个蒸汽。

我还有另一个答案详细说明了这个位置以及它在本网站中如何用于文本档案。

<强>更新

审核完代码后（谢谢！）我发现以下注意事项适用：

确实在简单示例中，您无法明确管理归档对象的生命周期。我已经看到这会导致问题（在MSVC IIRC上）。您也可以在[SO]上找到它。所以，写：

cout << "write data" << endl;
{
    std::ofstream ofs("data.dat");
    boost::archive::binary_oarchive out_arch(ofs);
    //boost::archive::text_oarchive out_arch(ofs);
    out_arch << mData;
}

cout << "read data" << endl;
{
    std::ifstream ifs("data.dat");
    if (!ifs) {
        cout << "read error!" << endl;
        return 1;
    }

    boost::archive::binary_iarchive in_arch(ifs);
    //boost::archive::text_iarchive in_arch(ifs);
    in_arch >> mData2;
}

您没有使用std::ios::binary，这可能会产生影响（可能取决于平台）：

std::ofstream ofs("data.dat", std::ios::binary);
// ...
std::ifstream ifs("data.dat", std::ios::binary);

我还建议改进ColorMatrix课程中字段和参数的命名。

异常：内存位置的boost :: archive :: archive_exception

1 个答案: