c++ - Get the content of a txt file

Question

I am using the windows API in C++ and I want to get the content of a specific txt file. I contemplate using the ReadFile function but I don' t know what I should use in place of HANDLE or, in other words, how I should pass as parameter the name of the txt file. What is the best way generally to get the content of a txt file using windows API.

Answer 1

使用CreateFile(), 提供GENERIC_READ参数dwDesiredAccess和参数，以获得传递给OPEN_EXISTING的a 。dwCreationDispositionHANDLEReadFile()

或者，更简单，只需使用std::ifstream：

#include <fstream>
#include <vector>
#include <string>

...

std::vector<std::sting> lines;
std::ifstream in("input.txt");
if (in.is_open())
{
    std::string line;
    while (std::getline(in, line)) lines.push_back(line);
}

Answer 2

首先，您必须调用CreateFile（“创建或打开文件或 I/O 设备”）。它返回一个句柄，您随后将其传递给ReadFile.

完成后，不要忘记调用CloseHandle。

Answer 3

您可以使用CreateFile函数创建 HANDLE 。