from base64 import decode


def write_bin_file(bin_path):
    with open(bin_path, 'wb') as f:
        f.write(b'Hello BinFile')


if __name__ == "__main__":
    path = "5.文件与IO/4.bin_file.bin"

    write_bin_file(path)
    # 如果想要打开二进制文件，那就需要做'rb'模式
    with open(path, 'rb') as f:
        print(f.read())

    # 在打印的时候也有差异，要记得先utf-8转码，不然出来的是ascii
    a = b'Hello BinFile'
    for i in a:
        print(i, end=' ')
    print()

    for i in a.decode('utf-8'):
        print(i, end='')
    print()

    # C语言结构体和数组这种自带缓冲区接口的东西，可以直接读写文件，而不用先用encoder编码
    import array
    a = array.array('i', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
    # 往文件里写array
    with open(path, 'wb') as f:
        f.write(a)

    # 直接把bin array从文件里薅出来塞到b的缓冲区
    b = array.array('i', [0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
    with open(path, 'rb') as f:
        f.readinto(b)

    print(b)

    # 但是这么干有风险，要谨慎应对