carbon_hid.py 文件源码

def cfstring_to_string(value_string):
    value_length = carbon.CFStringGetLength(value_string)
    buffer_length = carbon.CFStringGetMaximumSizeForEncoding(
        value_length, kCFStringEncodingUTF8)
    buffer = ctypes.c_buffer(buffer_length + 1)
    result = carbon.CFStringGetCString(value_string, 
                                       buffer, 
                                       len(buffer),
                                       kCFStringEncodingUTF8)
    if not result:
        return
    return buffer.value