从文件中读取文本到无符号字符数组

2022-01-12 00:00:00 file arrays char c++

我希望使用 OpenSSL 加密文件中的文本，并且在加密之前需要将文本放在无符号字符数组中.从文件读取文本到无符号字符数组的最简单方法是什么?

I was looking to use OpenSSL to encrypt text in a file, and will need the text to be in an unsigned char array before I encrypt it. What is the easiest way read text from a file to an unsigned char array?

推荐答案

您的问题被标记为 C 和 C++ (没有建设性).我会给 C++ 一个答案.

Your question is tagged both C and C++ (which isn't constructive). I will give an answer for C++.

#include <fstream>
#include <iterator>
#include <vector>

using namespace std;

int main()
{
    ifstream in("filename.txt"); //open file
    in >> noskipws;  //we don't want to skip spaces        
    //initialize a vector with a pair of istream_iterators
    vector<unsigned char> v((istream_iterator<unsigned char>(in)), 
                            (istream_iterator<unsigned char>()));
    ...
}

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