python - 从Python调用DLL函数

我想从Python调用DLL内的函数。但我收到此错误:

"Attribute Error function not found"

这是我的代码:

import os
import ctypes


os.chdir("C:\\Program Files\\Compact Automated Testing System V2.0")

# Load DLL into memory.
CATSDll = ctypes.WinDLL ("CATS.dll")

# Set up prototype and parameters for the desired function call.
CATSDllApiProto = ctypes.WINFUNCTYPE (ctypes.c_uint8,ctypes.c_double)

CATSDllApiParams = (1, "p1", 0), (1, "p2", 0),

# Actually map the call (setDACValue) to a Python name.
CATSDllApi = CATSDllApiProto (("setDACValue", CATSDll), CATSDllApiParams)

# Set up the variables and call the Python name with them.
p1 = ctypes.c_uint8 (1)
p2 = ctypes.c_double (4)

CATSDllApi(p1,p2)

但是DLL文档显示了带有setDACValue和ChannelId作为输入的函数DAC Voltage。

上面是基于StackOverflow的一段代码。

我还尝试了使用cdll.LoadLibrary的简单方法，然后调用该函数，但这也会产生相同的错误。

谁能建议我这是怎么回事？谢谢。

完整回溯:

Traceback (most recent call last):
  File "C:\Users\AEC_FULL\Softwares\eclipse\plugins\org.python.pydev_3.9.2.201502050007\pysrc\pydevd.py", line 2235, in <module>
    globals = debugger.run(setup['file'], None, None)
  File "C:\Users\AEC_FULL\Softwares\eclipse\plugins\org.python.pydev_3.9.2.201502050007\pysrc\pydevd.py", line 1661, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "C:\Users\AEC_FULL\Saravanan\Workspace\CATS\CATS.py", line 18, in <module>
    CATSDllApi = CATSDllApiProto (("setDACValue", CATSDll), CATSDllApiParams)
AttributeError: function 'setDACValue' not found

最佳答案

当指定函数原型(prototype)时，您不仅应指定参数的类型，还应将返回类型指定为WINFUNCTYPE的第一个arg。因此，线

CATSDllApiProto = ctypes.WINFUNCTYPE (ctypes.c_uint8,ctypes.c_double)

应该替换为

CATSDllApiProto = ctypes.WINFUNCTYPE (ctypes.c_uint8, ctypes.c_uint8,ctypes.c_double)