libuv 读文件

#include <stdio.h>
#include <spdlog/spdlog.h>
#include <uv.h>
#include <string>

uv_loop_t *loop;
uv_fs_t open_fs;
uv_buf_t uv_buf;
static char buffer[1024];

std::string result;

void on_read_cb(uv_fs_t *req)
{
    uv_fs_req_cleanup(req);
    if (req->result < 0)
    {
        spdlog::error("Read Fail.");
    }

    else if (req->result == 0)
    {
        uv_fs_close(loop, req, open_fs.result, nullptr);
    }else{
        spdlog::info("Get data:{}", buffer);
        uv_fs_read(loop,  req, open_fs.result, &uv_buf, 1, -1, on_read_cb);
    }
}

void on_open_cb(uv_fs_t *req)
{
    uv_fs_req_cleanup(req);
    if (req->result < 0)
    {
        spdlog::error("Open Fail.");
    }
    else
    {
        uv_buf = uv_buf_init(buffer, sizeof(buffer));
        uv_fs_read(loop, &read_fs, req->result, &uv_buf, 1, -1, on_read_cb);
    }
}

int main()
{
    loop = uv_default_loop();
    uv_fs_open(loop, &open_fs, "./test.txt", O_RDONLY, 0, on_open_cb);
    spdlog::info("Hello World");
    return uv_run(loop, UV_RUN_DEFAULT);
}