从文件读取和写入字节(C ++) [英] Read and write bytes from a file (c++)

问题描述

我认为我可能必须使用fstream对象，但是我不确定如何使用.本质上，我想将文件读入字节缓冲区，对其进行修改，然后将这些字节重写为文件.所以我只需要知道如何做字节I/O.

I think I probably have to use an fstream object but i'm not sure how. Essentially I want to read in a file into a byte buffer, modify it, then rewrite these bytes to a file. So I just need to know how to do byte i/o.

推荐答案

#include <fstream>

ifstream fileBuffer("input file path", ios::in|ios::binary);
ofstream outputBuffer("output file path", ios::out|ios::binary);
char input[1024];
char output[1024];

if (fileBuffer.is_open())
{
    fileBuffer.seekg(0, ios::beg);
    fileBuffer.getline(input, 1024);
}

// Modify output here.

outputBuffer.write(output, sizeof(output));

outputBuffer.close();
fileBuffer.close();

从内存来看，我认为这是怎么回事.

From memory I think this is how it goes.

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