正确地读取和写入std :: vector到文件中

Question

这就是重点.如何在其中写入和读取带有std :: vector的二进制文件？

我想的是:

//============ WRITING A VECTOR INTO A FILE ================
const int DIM = 6;
int array[DIM] = {1,2,3,4,5,6};
std::vector<int> myVector(array, array + DIM);
ofstream FILE(Path, ios::out | ofstream::binary);
FILE.write(reinterpret_cast<const char *>(&myVector), sizeof(vector) * 6);
//===========================================================

但我不知道如何阅读这个载体.因为我认为以下是正确的,但它不是:

ifstream FILE(Path, ios::in | ifstream::binary);
FILE.read(reinterpret_cast<const char *>(&myVector), sizeof(vector) * 6);

那么,如何进行操作？

Answer 1

尝试使用ostream_iterator/ ostreambuf_iterator,istream_iterator/ istreambuf_iterator和STL copy方法:

#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>

#include <fstream> // looks like we need this too (edit by ?)

std::string path("/some/path/here");

const int DIM = 6;
int array[DIM] = {1,2,3,4,5,6};
std::vector<int> myVector(array, array + DIM);
std::vector<int> newVector;

std::ofstream FILE(path, std::ios::out | std::ofstream::binary);
std::copy(myVector.begin(), myVector.end(), std::ostreambuf_iterator<char>(FILE));

std::ifstream INFILE(path, std::ios::in | std::ifstream::binary);
std::istreambuf_iterator iter(INFILE);
std::copy(iter.begin(), iter.end(), std::back_inserter(newVector));

Answer 2

使用boost::serialization.

如果你不想使用boost- 写大小和vector.

size_t sz = myVector.size();
FILE.write(reinterpret_cast<const char*>(&sz), sizeof(sz));
FILE.write(reinterpret_cast<const char*>(&myVector[0]), sz * sizeof(myVector[0]));