def login(ip, port, username, password, device_info, error_code):
"""
LLONG CLIENT_Login(
char *pchDVRIP, WORD wDVRPort,
char *pchUserName, char *pchPassword,
LPNET_DEVICEINFO intDredeviceInfoFO intDDlp* = 0);
:param ip:
#:param port:
# #:param username:
##:param# password:
:param## device_info::param
error_code::
return: LLONG"""ip_buffer = c_buffer(ip)
# ip_buffer.encode('utf8')# user_id = c_longlong(0)
user_id = SDK._dll.CLIENT_Login( byref(ip_buffer), port, username, password, byref(device_info), byref(error_code))
return user_id
# c_longlong(user_id).value
1.3.1 錯誤原因
網路上查了下，並看了下文檔，
python中調用C的sdk，預設返回的是int型，按照login C版本的函數定義，返回的是LLONG型
By default functions are assumed to return the C
int# attribute of the function
object.
Here is a more advanced example, it uses the
strchrpointer and a char, and returns a pointer to a string:
>>> strchr = libc.strchr
>>> strchr("abcdef", ord("d"))
8059983
>>> strchr.restype = c_char_p # c_char_p is a pointer to a string
>>> strchr("abcdef", ord("d"))
'def'
>>> print strchr("abcdef", ord("x"))
None
>>>index = userdata # c_uint(userdata).value
_buf_cond.acquire()
# time.sleep(0.2)
# 复制图片到内存
# _pic_buf.buf = pBuf c_char 和 c_byte转换
try:
temp = [pBuf[i] for i in xrange(0, RevLen)]
_buf_list[index].buf = struct.pack('%db' % RevLen, *temp)
# 序列号
_buf_list[index].sn = c_ulong(CmdSerial).value
_buf_list[index].id = index
_buf_list[index].size = c_uint(RevLen).value
_buf_list[index].ext = 'jpeg' # encode_dict.get(EncodeType, 'jpeg')
except Exception, e:
logger.error('截图缓存发生异常:%s' % str(e))
finally:
_buf_cond.notify()
_buf_cond.release()读
_buf_cond.acquire()
_buf_cond.wait(timeout=15.0)
# 等待200ms再访问数据
# time.sleep(0.2)
if _buf_list[self.index].sn == snap.CmdSerial and _buf_list[self.index].id == self.index:
self.save_picture(_buf_list[self.index].buf, _buf_list[self.index].ext)
self.info('针对通道%d截图成功，IP：%s，Port：%s' % (channel, self.ip, self.port))
pass
_buf_cond.release()self.callback = CFUNCTYPE(c_void_p, c_longlong, POINTER(c_byte), c_uint, c_uint, c_ulong, c_ulonglong)
def set_callback(self, save_after_recv_pic, index): self.dll.CLIENT_SetSnapRevCallBack(self._callback(save_after_recv_pic), index)
子类中定义，_save_after_recv_pic也在子类中定义为staticmethod
def _set_callback(self): try: if 0 <= self.index < _buf_size:
self.set_callback(self._save_after_recv_pic, self.index) # 函数调用层次太深，经常报segmentation fault
return True
else:
self.error('设置截图保存回调函数的userdata参数错误:%d' % self.index)
return False
except Exception, e:
self.error('设置截图保存回调函数失败,%s' % str(e))
return False<br>
self.capture_callback = self.callback(self._save_after_recv_pic)
子类中直接注册回调函数
def _set_callback(self):
try:
if 0 <= self.index < _buf_size:
self.dll.CLIENT_SetSnapRevCallBack(self.capture_callback, self.index)
# self.set_callback(self._save_after_recv_pic, self.index) # 函数调用层次太深，经常报segmentation fault
return True
else:
self.error('设置截图保存回调函数的userdata参数错误:%d' % self.index)
return False
except Exception, e:
self.error('设置截图保存回调函数失败,%s' % str(e))
return False以上是Python呼叫C的SDK出現回傳值不符合預期以及Segmentation fault的解決方法的詳細內容。更多資訊請關注PHP中文網其他相關文章！
