Here are more details about my codes, please help!
The function declared in C:
typedef void (WINAPI *PLEARNCALLBACKPROC) (unsigned int progress, unsigned int
sigQuality,
unsigned long carrierFreq, void *userData);
UUIRTDRV_API BOOL PASCAL UUIRTLearnIR(HUUHANDLE hHandle, int codeFormat, char
*IRCode,
PLEARNCALLBACKPROC progressProc, void *userData, BOOL *pAbort, unsigned int
param1, void
*reserved0, void *reserved1);
My python codes:
import ctypes
port = windll.uuirtdrv
myhandle = c_void_p()
myhandle = port.UUIRTOpen()
#+++++++ Call back function ++++++++
LEARNCALLBACKFUNC = CFUNCTYPE(c_void_p, c_uint, c_uint, c_ulong, c_void_p)
def py_learncallback_func(progress,sigQuality, carrierFreq, userdata):
print "progress is: %d %d %d %d" % (progress, sigQuality & 0xff,
carrierFreq, userdata)
if progress == 100:
mybool = c_int(1)
return
callback_func = LEARNCALLBACKFUNC(py_learncallback_func)
#++++++++++++++++++++++++++++++++++++++
glearnBuffer = create_string_buffer('\000'*2048)
mybool = c_int(0)
param1 = c_int(0)
reserved0 = c_void_p(0)
reserved1 = c_void_p(0)
mydata = create_string_buffer("0x5a5a5a5a")
#userdata = c_long(0x5a5a5a5a) #failed
#userdata = byref(mydata) #failed
#userdata = pointer(mydata) #failed
userdata = c_void_p(0x5a5a5a5a) #failed
learnformat = c_int(0x0000)
port.UUIRTLearnIR(myhandle, learnformat, glearnBuffer, callback_func, userdata,
mybool,param1,reserved0, reserved1)
I tried to define userdata in different ways and all failed with "access
violation
reading(writing) location...". The c routine just passes userdata to call back
function and didn't
use it anywhere else.
Thanks!
> Hi All,
>
> I need to use this C routine in python and there is a void pointer parameter
> in it:
> (this routine was written by someone else):
>
> myfunc(int a, (void *)userdata, int b)
>
> I saw someone in his C++ wrapper used this routine in this way:
> myfunc(a, (void *)0x5a5a5a5a, b)
>
> In my python wrapper, I tried to call it as the following and both failed:
> 1. myfunc(c_int(a), 0x5a5a5a5a, c_int(b))
> got error "access voilation reading from 0x5a5a5a5a"
> 2.
> data = 0x5a5a5a5a
> mydata = c_void_p(data)
> myfunc(c_int(a), mydata, c_int(b))
> same error as in 1
>
> Can anyone know how to fix it? Thanks!
>
>
>
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