在ctypes中定义类型BT\u ADDR？

Question

在尝试了一些简单的OS-BT函数之后，我怀疑我对BT_ADDR的定义是不对的。具体如下。我不熟悉ctypes，有人能给我一些提示吗？我的定义正确吗？我在python2.5上（是的，是的，硬件限制）

UCHAR = c_ubyte
ULONGLONG = c_ulonglong

# typedef ULONGLONG bt_addr, *pbt_addr, BT_ADDR, *PBT_ADDR;
BT_ADDR = ULONGLONG

# int BthGetCurrentMode(  BT_ADDR* pba,  unsigned char* pmode);
BthGetCurrentMode = windll.btdrt.BthGetCurrentMode 
BthGetCurrentMode.argtypes = [ POINTER( w.BT_ADDR ), POINTER(w.UCHAR) ]

# bt address: dc:1d:30:42:8b:19
bta = c_ulonglong( int('dc1d30428b19', 16) )
print(bta)  
#> c_ulonglong(242017921829657L)
pba = pointer( bta )

pmode = pointer(c_ubyte())
rt = BthGetCurrentMode( pba, pmode )
ec = GetLastError()
print( rt, ec )
#> 1168, 1168
# ERROR_NOT_FOUND = 1168          # Element not found.

更新：我按照建议更新了代码，但是在上面的函数中仍然出现错误1168。我在下面的另一个函数上试过，效果很好

# int BthRemoteNameQuery(  BT_ADDR* pba,  unsigned int cBuffer,  unsigned int* pcRequired,  WCHAR* szString);
BthRemoteNameQuery = btdrt.BthRemoteNameQuery
BthRemoteNameQuery.argtypes = [ POINTER(w.BT_ADDR),  w.UINT , POINTER(w.UINT),  POINTER(w.WCHAR) ]
cBuffer = 256
pcRequired = pointer( c_uint() )
szString = ctypes.create_unicode_buffer( 256 )
rt = BthRemoteNameQuery( pba, cBuffer, pcRequired ,szString )
ec = GetLastError()
if rt != 0 :
    print( "Rt%s, Err%s" % (rt,ec)  )
else:
    print( 'returned length=', pcRequired.contents )
    print( 'string=', szString.value )
#>13
#>u'QR-386A-8B19'