我一直在这里关注 WinUsb MSDN HowTo ，到目前为止它运行良好。我已经在指南中指出我必须从 WinUsb DLL 调用 WinUsb_Initialize() 函数。这就是我卡住的地方。到目前为止，我的代码是这样的，你无疑会确定我已经从 PyWinUSB 的 WinAPI.py 模块中撕下了很多东西。在此处插入无偿感谢并感谢 PyWinUSB 的创建者。
import ctypes
import platform
from ctypes import byref, POINTER, Structure, sizeof, c_ulong
from ctypes.wintypes import DWORD, WORD, BYTE, HANDLE, LPCWSTR, ULONG, WCHAR, \
BOOL
TCHAR = WCHAR
winUSB = ctypes.windll.winusb
winHID = ctypes.windll.hid
kernel32 = ctypes.windll.kernel32
setupAPI = ctypes.windll.setupapi
GENERIC_READ = (-2147483648)
GENERIC_WRITE = (1073741824)
FILE_SHARE_READ = 1
FILE_SHARE_WRITE = 2
OPEN_EXISTING = 3
FILE_FLAG_OVERLAPPED = 1073741824
if platform.architecture()[0].startswith('64'):
WIN_PACK = 8
else:
WIN_PACK = 1
class GUID(ctypes.Structure):
"""GUID Windows OS Structure"""
_pack_ = 1
_fields_ = [("data1", DWORD),
("data2", WORD),
("data3", WORD),
("data4", BYTE * 8)]
def __init__(self, data1 = None, data2 = None, data3 = None, data4 = None):
if data1 is not None:
self.data1 = data1
if data2 is not None:
self.data2 = data2
if data3 is not None:
self.data3 = data3
if data4 is not None:
self.data4 = data4
class SP_DEVICE_INTERFACE_DATA(Structure):
"""
typedef struct _SP_DEVICE_INTERFACE_DATA {
DWORD cbSize;
GUID InterfaceClassGuid;
DWORD Flags;
ULONG_PTR Reserved;
} SP_DEVICE_INTERFACE_DATA, *PSP_DEVICE_INTERFACE_DATA
"""
_pack_ = WIN_PACK
_fields_ = [("cb_size", DWORD),
("interface_class_guid", GUID),
("flags", DWORD),
("reserved", POINTER(ULONG))]
def __init__(self):
self.cb_size = sizeof(SP_DEVICE_INTERFACE_DATA)
class SP_DEVICE_INTERFACE_DETAIL_DATA(Structure):
"""
typedef struct _SP_DEVICE_INTERFACE_DETAIL_DATA {
DWORD cbSize;
TCHAR DevicePath[ANYSIZE_ARRAY];
} SP_DEVICE_INTERFACE_DETAIL_DATA, *PSP_DEVICE_INTERFACE_DETAIL_DATA;
"""
_pack_ = WIN_PACK
_fields_ = [("cb_size", DWORD),
("device_path", TCHAR * 1)] #device_path[1]
def __init__(self):
self.cb_size = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA)
def get_string(self):
"""Retreive stored string"""
return ctypes.wstring_at(byref(self, sizeof(DWORD)))
class SP_DEVINFO_DATA(Structure):
"""
typedef struct _SP_DEVINFO_DATA {
DWORD cbSize;
GUID ClassGuid;
DWORD DevInst;
ULONG_PTR Reserved;
} SP_DEVINFO_DATA, *PSP_DEVINFO_DATA;
"""
_pack_ = WIN_PACK
_fields_ = [("cb_size", DWORD),
("class_guid", GUID),
("dev_inst", DWORD),
("reserved", POINTER(ULONG))]
def __init__(self):
self.cb_size = sizeof(SP_DEVINFO_DATA)
class DIGCF:
"""
Flags controlling what is included in the device information set
built by SetupDiGetClassDevs
"""
DEFAULT = 0x00000001
PRESENT = 0x00000002
ALLCLASSES = 0x00000004
PROFILE = 0x00000008
DEVICEINTERFACE = 0x00000010
def GetHidGuid():
"Get system-defined GUID for HIDClass devices"
hid_guid = GUID()
winHID.HidD_GetHidGuid(byref(hid_guid))
return hid_guid
SetupDiGetClassDevs = setupAPI.SetupDiGetClassDevsW
SetupDiGetClassDevs.restype = HANDLE
SetupDiGetClassDevs.argtypes = [
# __in_opt const GUID *ClassGuid,
# __in_opt PCTSTR Enumerator,
# __in_opt HWND hwndParent,
# __in DWORD Flags,
POINTER(GUID),
LPCWSTR,
HANDLE,
DWORD]
SetupDiGetDeviceInterfaceDetail = setupAPI.SetupDiGetDeviceInterfaceDetailW
SetupDiGetDeviceInterfaceDetail.restype = BOOL
SetupDiGetDeviceInterfaceDetail.argtypes = [
# __in HDEVINFO DeviceInfoSet,
# __in PSP_DEVICE_INTERFACE_DATA DeviceIn,
# __out_opt PSP_DEVICE_INTERFACE_DETAIL_DATA DeviceInterfaceDetailData,
# __in DWORD DeviceInterfaceDetailDataSize,
# __out_opt PDWORD RequiredSize
# __out_opt PSP_DEVINFO_DATA DeviceInfoData
HANDLE,
POINTER(SP_DEVICE_INTERFACE_DATA),
POINTER(SP_DEVICE_INTERFACE_DETAIL_DATA),
DWORD,
POINTER(DWORD),
POINTER(SP_DEVINFO_DATA)]
devGuid = GUID(0x2518E22E, 0x0F35, 0x11E2, (BYTE * 8)(0xB1, 0xD5, 0x6C, 0xF0,
0x49, 0x73, 0x78, 0x72))
classGuid = GetHidGuid()
#GUID(0x745A17A0, 0x74D3, 0x11D0, (BYTE * 8)(0xB6, 0xFE, 0x00, 0xA0,
# 0xC9, 0x0F, 0x57, 0xDA))
derp = SetupDiGetClassDevs(
byref(classGuid), None, None,
(DIGCF.PRESENT | DIGCF.DEVICEINTERFACE))
def stepDevices(herp, index = 0):
devInterfaceData = SP_DEVICE_INTERFACE_DATA()
if setupAPI.SetupDiEnumDeviceInterfaces(
herp, None, byref(classGuid), index, byref(devInterfaceData)):
yield devInterfaceData
del devInterfaceData
else:
print(kernel32.GetLastError())
def enumDevices(herp):
index = 0
devInterfaceData = SP_DEVICE_INTERFACE_DATA()
while setupAPI.SetupDiEnumDeviceInterfaces(
herp, None, byref(classGuid), index, byref(devInterfaceData)):
print(kernel32.GetLastError())
yield devInterfaceData
index += 1
del devInterfaceData
def getDetail(herp, devData, devInfo = None):
reqSize = c_ulong(0)
devDetail = SP_DEVICE_INTERFACE_DETAIL_DATA()
SetupDiGetDeviceInterfaceDetail(
herp, byref(devData), None, 0, byref(reqSize), None)
ctypes.resize(devDetail, reqSize.value)
SetupDiGetDeviceInterfaceDetail(
herp, byref(devData), byref(devDetail),
reqSize, None, byref(devInfo))
return devDetail.get_string()
dev = stepDevices(derp).next()
devInfo = SP_DEVINFO_DATA()
devString = getDetail(derp, dev, devInfo)
winUSBHandle = kernel32.CreateFileW(
devString, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, None, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, None)
#winUSB.WinUsb_Initialize(winUSBHandle, <what goes here?>)
我尝试创建一个简单的句柄并将 byref(handle) 作为第二个参数传递给函数，但句柄值保持为 None。我不知道 Python 和 WinUSB.DLL 做了多少工作，但如果有人能指出我正确的方向，我将不胜感激。
提前致谢。