您的回调类型签名错误;您忘记了结果类型。当函数退出时,它也会收集垃圾。您需要使其全球化。
您的GetStatus
电话缺少论据pArg
。另外,在使用指针时,您需要定义argtypes
,否则在64位平台上会遇到问题。ctypes的默认参数类型为Cint
。
from ctypes import *
api = CDLL('API.dll')
StatusCB = WINFUNCTYPE(None, c_int, c_int, c_void_p)
GetStatus = api.GetStatus
GetStatus.argtypes = [StatusCB, c_void_p]
GetStatus.restype = None
def status_fn(nErrorCode, nSID, pArg):
print 'Hello world'
print pArg[0] # 42?
# reference the callback to keep it alive
_status_fn = StatusCB(status_fn)
arg = c_int(42) # passed to callback?
def start():
GetStatus(_status_fn, byref(arg))