将文件加载到向量中< char> [英] Loading a file into a vector<char>

问题描述

我想将文本文件的内容加载到向量< char> （或者任何字符输入迭代器，如果可能的话）。目前我的代码如下：

I would like to load the contents of a text file into a vector<char> (or into any char input iterator, if that is possible). Currently my code looks like this:

std::vector<char> vec;
std::ifstream file("test.txt");
assert(file.is_open());
while (!(file.eof() || file.fail())) {
    char buffer[100];
    file.read(buffer, 100);
    vec.insert(vec.end(), buffer, buffer + file.gcount());
}

我不喜欢手动使用缓冲区不是200，或25或任何？），或这需要大量的行。代码看起来很丑陋，非C ++。是否有更直接的方式这样做？

I do not like the manual use of a buffer (Why 100 chars? Why not 200, or 25 or whatever?), or the large number of lines that this took. The code just seems very ugly and non-C++. Is there a more direct way of doing this?

推荐答案

如果你想避免读char by：

If you want to avoid reading char by char:

if (!file.eof() && !file.fail())
{
    file.seekg(0, std::ios_base::end);
    std::streampos fileSize = file.tellg();
    vec.resize(fileSize);

    file.seekg(0, std::ios_base::beg);
    file.read(&vec[0], fileSize);
}

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