当我试图反序列化二进制数据时,我得到这个:
exception: boost::archive::archive_exception at memory location
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工作良好
序列化的数据结构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一个问题。测试数据都没问题
测试代码:
#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;
}
两个提示
-
确保档案的生命周期是关闭的,特别是不重叠
-
文本存档工作的事实让我怀疑你是否正确地编写二进制流。还请注意,在Boost序列化中,您可以而不是安全地将多个存档连接到同一个蒸汽。
我有另一个答案,详细说明了这种情况,以及它如何在这个网站的文本存档中工作。
检查代码后(谢谢!)我发现以下注释适用:
-
确实在简单的示例中,您没有显式地管理归档对象的生命周期。我看到这导致了一些问题(在MSVC IIRC上)。你也可以在[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; }
-
您不使用
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
类中字段和参数的命名。