fstream读取文件

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

int readFile()
{
    std::ifstream ifs;
    //ifs.open("read.txt", std::ios::in);
    ifs.open("read.txt", std::ios::in | std::ios::binary);
    if (!ifs.is_open())
    {
        std::cout << "文件打开失败" << std::endl;
    }
#if 0
    char buf[1024] = { 0 };
    while(ifs >> buf)
    {
        std::cout << buf << std::endl;
    }
    char buf[1024] = { 0 };
    while(ifs.getline(buf.size(buf)))
    {
        std::cout<< buf << std::endl;
    }
    std::string buf;
    while(getline(ifs, buf))
    {
        std::cout<< buf << std::endl;
    }

    char c;
    while((c = ifs.get()) != EOF)
    {
        std::cout << c;
    }
#endif
    ifs.seekg(0, ifs.end);
    uint32_t fileSize = ifs.tellg();
    std::cout << "fileSize="<< fileSize << std::endl;
    //读取二进制
    char buf[1024] = { 0 };
    //ifs.read(buf, sizeof(buf));
    ifs.read(buf, 10);
    uint32_t readlength = ifs.gcount();
    std::cout << "readlength="<< readlength << std::endl;
    std::cout << buf << std::endl;
    ifs.close();

    uint16_t did = 0xf1bc; 
    printf("%s[%-02x]\n", __FILE__, did);
    return 0;
}

int main()
{
    readFile();
    return 0;
}