通过istream_iterator从文件中读入数字为什么出错？

[cheyo车油]

#include <string>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <numeric>
#include <functional>

const char * FileName = "output_file.txt";

void func()
{
    std::vector<int> vValue;
    for (int i = 0; i < 10; ++i)
    {
        vValue.push_back(i);
    }

    std::ofstream outFile(FileName);
    std::ostream_iterator<int> os(outFile, " ");
    std::copy(vValue.begin(), vValue.end(), os);
    std::cout << "write file success." << std::endl;

    std::ifstream inFile(FileName);
    if (!inFile)
    {
        std::cerr << "! open file error" << std::endl;
    }

    std::istream_iterator<int> is(inFile);
    std::istream_iterator<int> eof;
    
    std::ostream_iterator<int> so(std::cout, " ");
    std::vector<int> vValue2;
    std::copy(is, eof, std::back_inserter(vValue2)); /// 文件中的数据没有读入到vValue2中


    std::copy(vValue2.begin(), vValue2.end(), so);
}

int main(int argc, char* argv[])
{
    func();

    return 0;
}

[机智的呆呆]

    std::cout << "write file success." << std::endl;
    outFile.close();//加这一句试试

    std::ifstream inFile(FileName);

[qq120848369]

我这里正常啊.

[就想叫yoko]

Calls the close member function for the associated filebuf object. This function, in turn, flushes any waiting output, closes the file, and disconnects the file from the filebuf object. The filebuf object is not destroyed[Quote=引用 1 楼 demon__hunter 的回复:]

C/C++ code

std::cout << "write file success." << std::endl;
outFile.close();//加这一句试试

std::ifstream inFile(FileName);
[/Quote]

[ryfdizuo]

[Quote=引用 1 楼 demon__hunter 的回复:]

C/C++ code

std::cout << "write file success." << std::endl;
outFile.close();//加这一句试试

std::ifstream inFile(FileName);
[/Quote]
要先关掉再打开。