Question

我修改了一个来自互联网的来源，用于复制文件，以便它可以在运行时从用户那里获取文件路径。

#include <fstream>
#include <memory>
#include <iostream>
#include <string.h>

//C++98 implementation, this function returns true if the copy was successful, false otherwise.

bool copy_file(const char* From, const char* To, std::size_t MaxBufferSize = 1048576)
{
    std::ifstream is(From, std::ios_base::binary);
    std::ofstream os(To, std::ios_base::binary);

    std::pair<char*,std::ptrdiff_t> buffer;
    buffer = std::get_temporary_buffer<char>(MaxBufferSize);

    //Note that exception() == 0 in both file streams,
    //so you will not have a memory leak in case of fail.
    while(is.good() and os)
    {
       is.read(buffer.first, buffer.second);
       os.write(buffer.first, is.gcount());
    }

    std::return_temporary_buffer(buffer.first);

    if(os.fail()) return false;
    if(is.eof()) return true;
    return false;
}



int main()
{
    char fileSourcePath[1000];
    char fileDestinationPath[1000];
    std::cout<<"Enter Path of the source file: ";
    std::cin>>fileSourcePath;
    std::cout<<"Source Path: "<<fileSourcePath<<std::endl;
    std::cout<<"Enter Destination path: ";
    std::cin>>fileDestinationPath;
    std::cout<<"Destination Path: "<<fileDestinationPath<<std::endl;
   bool CopyResult = copy_file(fileSourcePath, fileDestinationPath);

   std::boolalpha(std::cout);
   std::cout << "Could it copy the file? " << CopyResult << '\n';
}

问题是，当我在copy_file(fileSourcePath, fileDestinationPath);的源代码中直接输入文件路径程序有效时，但是当我在运行时输入路径时，程序运行并终止给出错误的结果。此外，当我输入c：\ upx时.exe它给出了真实的状态但是dosent复制文件。如何修复它？我做错了什么。

fstream在复制程序中的奇怪行为

0 个答案: