base.py 文件源码

def ctypes2buffer(cptr, length):
    """Convert ctypes pointer to buffer type.

    Parameters
    ----------
    cptr : ctypes.POINTER(ctypes.c_char)
        pointer to the raw memory region
    length : int
        the length of the buffer

    Returns
    -------
    buffer : bytearray
        The raw byte memory buffer
    """
    if not isinstance(cptr, ctypes.POINTER(ctypes.c_char)):
        raise TypeError('expected char pointer')
    res = bytearray(length)
    rptr = (ctypes.c_char * length).from_buffer(res)
    if not ctypes.memmove(rptr, cptr, length):
        raise RuntimeError('memmove failed')
    return res