Question

当我尝试导入序列时，我收到以下错误：

Traceback (most recent call last):
  File "C:\Documents and Settings\eduardo.pereira\workspace\thgspeak\tst.py", line 7, in <module>
    import serial
  File "C:\Python27\lib\site-packages\serial\__init__.py", line 27, in <module>
    from serial.serialwin32 import Serial
  File "C:\Python27\lib\site-packages\serial\serialwin32.py", line 15, in <module>
    from serial import win32
  File "C:\Python27\lib\site-packages\serial\win32.py", line 182, in <module>
    CancelIoEx = _stdcall_libraries['kernel32'].CancelIoEx
  File "C:\Python27\lib\ctypes\__init__.py", line 375, in __getattr__
    func = self.__getitem__(name)
  File "C:\Python27\lib\ctypes\__init__.py", line 380, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: function 'CancelIoEx' not found

我安装了最新版本的pySerial，Python 2.7在WinXP笔记本电脑上运行。到处尝试，发现没有类似的问题。那有什么解决方案吗？提前谢谢......

Answer 1

您正在使用的pySerial版本正在尝试调用仅在Windows Vista中可用的function，而您正在运行Windows XP。

使用较旧版本的pySerial可能值得尝试。

有问题的代码是added to pySerial on 3 May 2016，所以在此之前的版本可能是一个好的开始。

Answer 2

旧版本似乎不可用。但是，这对我有用（假设nanpy版本3.1.1）：

打开文件\ lib \ site-packages \ serial \ serialwin32.py
删除方法_cancel_overlapped_io()，cancel_read()，cancel_write()在第436-455行，几乎位于文件的底部
更改方法_close（）als如下：

（Python）

def _close(self):
    """internal close port helper"""
    if self._port_handle is not None:
        # Restore original timeout values:
        win32.SetCommTimeouts(self._port_handle, self._orgTimeouts)
        # Close COM-Port:
        if self._overlapped_read is not None:
            win32.CloseHandle(self._overlapped_read.hEvent)
            self._overlapped_read = None
        if self._overlapped_write is not None:
            win32.CloseHandle(self._overlapped_write.hEvent)
            self._overlapped_write = None
        win32.CloseHandle(self._port_handle)
        self._port_handle = None

此外，在开始通信时创建一个非默认的串行连接，否则你将被绑定到一些linux设备：

a = ArduinoApi(SerialManager("COM5:"))

for i in range(10):
    a.pinMode(13, a.OUTPUT)
    a.digitalWrite(13, a.HIGH)
    # etc.

Answer 3

并在串口\ win32.py评论中

#CancelIoEx = _stdcall_libraries['kernel32'].CancelIoEx
#CancelIoEx.restype = BOOL
#CancelIoEx.argtypes = [HANDLE, LPOVERLAPPED]

Python串行导入时出错

3 个答案: