caiofiles: 异步文件支持 file support for asyncio

尝试不使用多线程而是调用Windows的 fileapi实现在事件循环内的文件异步IO。 Try to use Windows' fileapi to achieve asynchronous file IO in event loop, instead of using multithreading. 重新封装支持偏移量的ReadFile和Overlapped结构体，借用IocpProactor注册文件句柄实现异步文件读取。

支持的平台 platform

windows

安装 install

python setup.py install

用法 Usage

import asyncio
async def test_read_file():
    import aiofile
    fp = aiofile.open("C:\\Users\\lin\\Downloads\\python-3.11.1-amd64.exe")
    data = []
    
    async def coro(fp):
        nonlocal data
        data.append(await fp.read_async(1024))
    
    await asyncio.gather(*[coro(fp) for i in range(30000)])
    data = b"".join(data)
    with open("C:\\Users\\lin\\Downloads\\python-3.11.1-amd64.exe", "rb") as f:
        print(f.read() == data, len(data))

async def test_readline():
    import aiofile
    fp = aiofile.open("write.txt")
    count = 0
    while await fp.readline():
        count += 1
    print(count)

async def test_readlines():
    import aiofile
    fp = aiofile.open("write.txt")
    lines = await fp.readlines()
    with open("write.txt", "rb") as fp:
        print(fp.readlines() == lines)

if __name__ == '__main__':
    asyncio.run(test_read_file())
    asyncio.run(test_readline())
    asyncio.run(test_readlines())