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我正在尝试让蓝牙打印机在 WinCE 手持设备上工作。当我在 PythonCE by 中运行它时execfile('.../bt_ce.py')，它没有给出任何反馈，就像我没有输入任何内容一样。没有句柄或索引被打印回来。我再次尝试后，它总是导致 Error110或2102. 我对 C++ 和 WinCE API 很陌生。我看不出问题出在哪里。

我的设备是 WinCE 5.0 条码扫描仪。我的代码如下改编自https://msdn.microsoft.com/en-us/library/ms881004.aspx

# -*- coding: utf-8 -*-
import ctypes
from ctypes import POINTER, Structure, c_ulonglong, c_int, pointer, c_ulong, c_wchar
from comtypes import GUID
from ctypes.wintypes import DWORD,WORD,BYTE,UINT, HANDLE, WCHAR, ULONG
INT = c_int
ULONGLONG = c_ulonglong

# typedef ULONGLONG bt_addr, *pbt_addr, BT_ADDR, *PBT_ADDR;
bt_addr = ULONGLONG
BT_ADDR = POINTER(bt_addr)

"""
execfile('\\program files\\ppygui_client\\bluetooth_ce.py')
"""
RFCOMM_PORT_FLAGS_REMOTE_DCB = 0x00000001 
RFCOMM_PORT_FLAGS_KEEP_DCD = 0x00000002 
RFCOMM_PORT_FLAGS_AUTHENTICATE = 0x00000004 
RFCOMM_PORT_FLAGS_ENCRYPT = 0x00000008 

RegisterDevice = ctypes.windll.coredll.RegisterDevice
DeregisterDevice = ctypes.windll.coredll.DeregisterDevice

GetLastError = ctypes.windll.coredll.GetLastError
SetLastError = ctypes.windll.coredll.SetLastError

class PORTEMUPortParams(Structure):
    _fields_=[
        ( 'channel' , INT),
        ( 'flocal', INT ),
        ( 'device', BT_ADDR),
        ( 'imtu', INT ),
        ( 'iminmtu', INT ),
        ( 'imaxmtu', INT ),
        ( 'isendquota', INT ),
        ( 'irecvquota', INT ),
        ( 'uuidService', GUID ),
        ( 'uiportflags', UINT)
    ]
    def __init__( self, device_str=None, 
                    flocal=False, 
                    channel = None,
                    uuidService=None, 
                    uiportflags=None ):
        if device_str is None and not flocal:
            raise Exception( 'device address missing in client mode.' ) 
        # memset (&pp, 0, sizeof(pp));
        ctypes.memset( ctypes.addressof(self), 0, ctypes.sizeof(self) )
        self.flocal = INT( flocal )
        if not flocal:
            bta = c_ulonglong( long(device_str, 16) )
            print(bta)
            bta_p = BT_ADDR( bta )
            self.deivce = bta_p
        # I don't have the channel address
        # pp.channel # channel & 0xff;
        if uuidService:
            self.uuidService = uuidService
        else:
            # https://stackoverflow.com/questions/27302060/how-to-check-if-an-paired-bluetooth-device-is-a-printer-or-a-scanner-android
            self.uuidService = GUID("{00001101-0000-1000-8000-00805F9B34FB}")
        if channel:
            self.channel = channel & 0xff
        if uiportflags:
            self.uiportflags = uiportflags

print( "try uuidService" )
pp = PORTEMUPortParams('dc1d30428b19')
pp.uiportflags = RFCOMM_PORT_FLAGS_AUTHENTICATE
# pp.uiportflags = RFCOMM_PORT_FLAGS_REMOTE_DCB
# pp.uiportflags = RFCOMM_PORT_FLAGS_REMOTE_DCB | RFCOMM_PORT_FLAGS_AUTHENTICATE
index = 6
SetLastError( DWORD(0) )
#HANDLE h = RegisterDevice ("COM", index, "btd.dll", (DWORD)&pp );
h = RegisterDevice(u"COM", index, u"btd.dll", DWORD( ctypes.addressof(pp) ) )
if h :
    print( 'handle=', h )
    print( "COM", index )
    DeregisterDevice( h )
else:
    print('failed', GetLastError())
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1 回答 1

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端口号不正确，由于某种原因，我的设备上总是占用端口 1、2、5、6。更改端口可解决此问题。

Winsock 方式确实更容易让它工作。根据 .netInTheHand蓝牙库的文档。在 WinCE 上设置 bt 虚拟 COM 端口有两种方法，一种是 RegisterDevice 调用，另一种是通过注册控制服务，需要重新启动。前者不稳定，似乎对许多设备没有影响。我想我的也包括在内，真是浪费时间......

于 2018-04-15T00:26:19.677 回答