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[英]How do I hook a ctypes.windll.user32.MessageBoxW by using ctypes.windll.user32.SetWindowsHookExW?
[英]How do I pass a class object to a ctypes.windll.LoadLibrary(DLL) function?
我正在使用 Python 並嘗試使用 WinUSB(來自 Microsoft)與這個簡單的 USB 設備通信。 我遇到了一個問題,因為為了找到設備,調用 setupAPI function SetupDiEnumDeviceInterfaces 采用結構 object,我將其定義為 class:
class _SP_DEVINFO_DATA:
def __init__(self, ClassGUID, DevInst = ""):
'''flags = SPINT_DEFAULT, SPINT_REMOVED, or SPINT_ACTIVE'''
self._ClassGUID = None
self._DevInst = None
self._Reserved = None
self._cbSize = None
###Getters:
def getClassGUID(self):
return self._ClassGUID
def getDevInst(self):
return self._DevInst
def getReserved(self):
return self._Reserved
def getcbSize(self):
return self._cbSize
###Setters:
def setClassGUID(self, value):
self._ClassGUID = value
def setDevInst(self, value):
self._DevInst = value
def setReserved(self, value):
self._Reserved = value
def setcbSize(self):
self._cbSize = sys.getsizeinfo(self)
ClassGUID = property(getClassGUID, setClassGUID, None, "Class GUID")
DevInst = property(getDevInst, setDevInst, None, "Device Instance")
Reserved = property(getReserved, setReserved, None, "RESERVED: DO NOT USE")
cbSize = property(getcbSize, setcbSize, None, "CB Size. Set automatically")
我嘗試使用該屬性,因為它給了我錯誤:
<type 'exceptions.TypeError'>: Don't know how to convert parameter
否則,我會讀到像這樣定義參數可以解決問題,但事實並非如此,我不確定在這里做什么。
我想使用 WinUSB,因為我只需要從設備讀取和寫入設備,就是這樣,WinUSB 似乎有我需要的東西,但在我解決這個問題之前,我有點卡住了
有什么建議么? 如何將 class object 傳遞給加載了 ctypes.windll.LoadLibrary(DLL) 的 DLL function?
如果有更簡單的方法來做到這一點,我也完全贊成。
謝謝。
正如@Roland 所說,您必須從ctypes.Structure
派生。 這是一個工作版本:
import ctypes
from ctypes import wintypes
import uuid
class _SP_DEVINFO_DATA(ctypes.Structure):
_fields_ = [("cbSize", wintypes.DWORD),
("ClassGuid", ctypes.c_char * 16),
("DevInst", wintypes.DWORD),
("Reserved", wintypes.LPVOID)]
def __init__(self, guid, inst):
self.cbSize = ctypes.sizeof(_SP_DEVINFO_DATA)
self.ClassGuid = uuid.UUID(guid).get_bytes()
self.DevInst = (ctypes.c_ulong)(inst)
self.Reserved = None
def __repr__(self):
return "_SP_DEV_INFO_DATA(cbsize={},ClassGuid={},DevInst={})".format(
self.cbSize,uuid.UUID(bytes=self.ClassGuid),hex(self.DevInst))
sp = _SP_DEVINFO_DATA('08751880-13bb-11e2-96f0-402cf4ca5e51',0x12345678)
print sp
Output:
_SP_DEV_INFO_DATA(cbsize=28,ClassGuid=08751880-13bb-11e2-96f0-402cf4ca5e51,DevInst=0x12345678L)
您的 class 應該派生自ctypes.Structure
。
import ctypes
class _SP_DEVINFO_DATA(ctypes.Structure):
_fields_ = [("cbSize", ctypes.c_ulong),
("ClassGuid", ctypes.c_ubyte * 12),
("DevInst", ctypes.c_ulong),
("Reserved", ctypes.c_voidp)]
def __init__(self, guid, inst):
self.cbSize = 24
# GUID doesn't work like this... Needs proper conversion
#self.ClassGuid = (ctypes.c_ubyte * 12)(bytearray(guid))
self.DevInst = (ctypes.c_ulong)(inst)
self.Reserved = None
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