f



WindowsError: exception: access violation writing 0x00000000

Hello! I am using cTypes on Windows to interface with a dll and I keep
getting an error when I execute this method:

def eDigitalIn(self, channel, idNum = None, demo = 0, readD=0):
        """
        Name: U12.eAnalogIn(channel, idNum = None, demo = 0, readD=0)
        Args: See section 4.4 of the User's Guide
        Desc: This is a simplified version of Counter. Reads & resets
the counter (CNT).
        """

        if idNum is None:
            idNum = self.id

        ljid = ctypes.c_long(idNum)
        state = ctypes.c_long(999)

        ecode = staticLib.ECount(ctypes.byref(ljid), demo, channel,
readD, ctypes.byref(state))

        if ecode != 0: raise LabJackException(ecode)
        if ljid == -1: raise LabJackException(-1, "LabJack not
found.")

        return {"idnum":ljid.value, "state":state.value}

Here is the error message:
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    device.eDigitalIn(0)
  File "C:\Documents and Settings\All Users\Documents\Python
\LabJackPython_new\u12.py", line 118, in eDigitalIn
    ecode = staticLib.ECount(ctypes.byref(ljid), demo, channel, readD,
ctypes.byref(state))
WindowsError: exception: access violation writing 0x00000000

Here is the signature of the method (which is known to work with C++
programs):

long _stdcall EDigitalIn(long *idnum,
					   long demo,
					   long channel,
					   long readD,
					   long *state);

staticLib is declared with staticLib = ctypes.windll.LoadLibrary
("ljackuw").

Any ideas?

Thanks,
Sam
0
Samnsparky (25)
8/3/2009 9:29:05 PM
comp.lang.python 77058 articles. 6 followers. Post Follow

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On Aug 3, 3:29=A0pm, Sparky <Samnspa...@gmail.com> wrote:
> Hello! I am using cTypes on Windows to interface with a dll and I keep
> getting an error when I execute this method:
>
> def eDigitalIn(self, channel, idNum =3D None, demo =3D 0, readD=3D0):
> =A0 =A0 =A0 =A0 """
> =A0 =A0 =A0 =A0 Name: U12.eAnalogIn(channel, idNum =3D None, demo =3D 0, =
readD=3D0)
> =A0 =A0 =A0 =A0 Args: See section 4.4 of the User's Guide
> =A0 =A0 =A0 =A0 Desc: This is a simplified version of Counter. Reads & re=
sets
> the counter (CNT).
> =A0 =A0 =A0 =A0 """
>
> =A0 =A0 =A0 =A0 if idNum is None:
> =A0 =A0 =A0 =A0 =A0 =A0 idNum =3D self.id
>
> =A0 =A0 =A0 =A0 ljid =3D ctypes.c_long(idNum)
> =A0 =A0 =A0 =A0 state =3D ctypes.c_long(999)
>
> =A0 =A0 =A0 =A0 ecode =3D staticLib.ECount(ctypes.byref(ljid), demo, chan=
nel,
> readD, ctypes.byref(state))
>
> =A0 =A0 =A0 =A0 if ecode !=3D 0: raise LabJackException(ecode)
> =A0 =A0 =A0 =A0 if ljid =3D=3D -1: raise LabJackException(-1, "LabJack no=
t
> found.")
>
> =A0 =A0 =A0 =A0 return {"idnum":ljid.value, "state":state.value}
>
> Here is the error message:
> Traceback (most recent call last):
> =A0 File "<pyshell#4>", line 1, in <module>
> =A0 =A0 device.eDigitalIn(0)
> =A0 File "C:\Documents and Settings\All Users\Documents\Python
> \LabJackPython_new\u12.py", line 118, in eDigitalIn
> =A0 =A0 ecode =3D staticLib.ECount(ctypes.byref(ljid), demo, channel, rea=
dD,
> ctypes.byref(state))
> WindowsError: exception: access violation writing 0x00000000
>
> Here is the signature of the method (which is known to work with C++
> programs):
>
> long _stdcall EDigitalIn(long *idnum,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0long demo,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0long channel,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0long readD,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0long *state);
>
> staticLib is declared with staticLib =3D ctypes.windll.LoadLibrary
> ("ljackuw").
>
> Any ideas?
>
> Thanks,
> Sam

One more thing, I seem to be getting back incorrect values for doubles
passed by reference. Any suggestions? I am on a 64-bit machine but I
should think that should not make a difference.

Thanks again,
Sam
0
Samnsparky (25)
8/4/2009 3:25:28 PM
On Aug 4, 2009, at 11:25 AM, Sparky wrote:

> On Aug 3, 3:29 pm, Sparky <Samnspa...@gmail.com> wrote:
>> Hello! I am using cTypes on Windows to interface with a dll and I  
>> keep
>> getting an error when I execute this method:
>>
>> def eDigitalIn(self, channel, idNum = None, demo = 0, readD=0):
>>         """
>>         Name: U12.eAnalogIn(channel, idNum = None, demo = 0, readD=0)
>>         Args: See section 4.4 of the User's Guide
>>         Desc: This is a simplified version of Counter. Reads & resets
>> the counter (CNT).
>>         """
>>
>>         if idNum is None:
>>             idNum = self.id
>>
>>         ljid = ctypes.c_long(idNum)
>>         state = ctypes.c_long(999)
>>
>>         ecode = staticLib.ECount(ctypes.byref(ljid), demo, channel,
>> readD, ctypes.byref(state))
>>
>>         if ecode != 0: raise LabJackException(ecode)
>>         if ljid == -1: raise LabJackException(-1, "LabJack not
>> found.")
>>
>>         return {"idnum":ljid.value, "state":state.value}
>>
>> Here is the error message:
>> Traceback (most recent call last):
>>   File "<pyshell#4>", line 1, in <module>
>>     device.eDigitalIn(0)
>>   File "C:\Documents and Settings\All Users\Documents\Python
>> \LabJackPython_new\u12.py", line 118, in eDigitalIn
>>     ecode = staticLib.ECount(ctypes.byref(ljid), demo, channel,  
>> readD,
>> ctypes.byref(state))
>> WindowsError: exception: access violation writing 0x00000000
>>
>> Here is the signature of the method (which is known to work with C++
>> programs):
>>
>> long _stdcall EDigitalIn(long *idnum,
>>                                            long demo,
>>                                            long channel,
>>                                            long readD,
>>                                            long *state);
>>
>> staticLib is declared with staticLib = ctypes.windll.LoadLibrary
>> ("ljackuw").
>>
>> Any ideas?
>>
>> Thanks,
>> Sam
>
> One more thing, I seem to be getting back incorrect values for doubles
> passed by reference. Any suggestions? I am on a 64-bit machine but I
> should think that should not make a difference.

Hi Sam,
ctypes is pretty straightforward, and I wouldn't expect it to break on  
something simple. I looked over your code (warning -- I am a ctypes  
novice) and it looks OK to me. If you're getting null pointer writes  
I'd suspect that the call signature isn't what you think it is,  
perhaps due to a lack of an extern "C" declaration or something like  
that. In short, I don't think this is a problem in your Python code or  
in ctypes.

But since your Python code is the easiest to change, why not do a  
quick test of a minimal example?

def eDigitalIn_test_version(self, channel, idNum = None, demo = 0,  
readD=0):
         ljid = ctypes.c_long(42)
         state = ctypes.c_long(999)

         ecode = staticLib.ECount(ctypes.byref(ljid), 0, 0, 0,  
ctypes.byref(state))

         print ecode


Does that work any better?

You could also try replacing the byref() calls with pointers created  
by ctypes.pointer(). But I suspect that all this will do is give you  
confidence that it isn't your Python code that's wrong.

You might want to write a minimal C program that invokes ECount. That  
would help you to prove whether or not you have a working C (not C++!)  
interface for your function.

HTH
Philip




0
philip8322 (304)
8/4/2009 3:47:31 PM
On Aug 4, 9:47=A0am, Philip Semanchuk <phi...@semanchuk.com> wrote:
> On Aug 4, 2009, at 11:25 AM, Sparky wrote:
>
>
>
>
>
> > On Aug 3, 3:29 pm, Sparky <Samnspa...@gmail.com> wrote:
> >> Hello! I am using cTypes on Windows to interface with a dll and I =A0
> >> keep
> >> getting an error when I execute this method:
>
> >> def eDigitalIn(self, channel, idNum =3D None, demo =3D 0, readD=3D0):
> >> =A0 =A0 =A0 =A0 """
> >> =A0 =A0 =A0 =A0 Name: U12.eAnalogIn(channel, idNum =3D None, demo =3D =
0, readD=3D0)
> >> =A0 =A0 =A0 =A0 Args: See section 4.4 of the User's Guide
> >> =A0 =A0 =A0 =A0 Desc: This is a simplified version of Counter. Reads &=
 resets
> >> the counter (CNT).
> >> =A0 =A0 =A0 =A0 """
>
> >> =A0 =A0 =A0 =A0 if idNum is None:
> >> =A0 =A0 =A0 =A0 =A0 =A0 idNum =3D self.id
>
> >> =A0 =A0 =A0 =A0 ljid =3D ctypes.c_long(idNum)
> >> =A0 =A0 =A0 =A0 state =3D ctypes.c_long(999)
>
> >> =A0 =A0 =A0 =A0 ecode =3D staticLib.ECount(ctypes.byref(ljid), demo, c=
hannel,
> >> readD, ctypes.byref(state))
>
> >> =A0 =A0 =A0 =A0 if ecode !=3D 0: raise LabJackException(ecode)
> >> =A0 =A0 =A0 =A0 if ljid =3D=3D -1: raise LabJackException(-1, "LabJack=
 not
> >> found.")
>
> >> =A0 =A0 =A0 =A0 return {"idnum":ljid.value, "state":state.value}
>
> >> Here is the error message:
> >> Traceback (most recent call last):
> >> =A0 File "<pyshell#4>", line 1, in <module>
> >> =A0 =A0 device.eDigitalIn(0)
> >> =A0 File "C:\Documents and Settings\All Users\Documents\Python
> >> \LabJackPython_new\u12.py", line 118, in eDigitalIn
> >> =A0 =A0 ecode =3D staticLib.ECount(ctypes.byref(ljid), demo, channel, =
=A0
> >> readD,
> >> ctypes.byref(state))
> >> WindowsError: exception: access violation writing 0x00000000
>
> >> Here is the signature of the method (which is known to work with C++
> >> programs):
>
> >> long _stdcall EDigitalIn(long *idnum,
> >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0long demo,
> >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0long channel,
> >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0long readD,
> >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0long *state);
>
> >> staticLib is declared with staticLib =3D ctypes.windll.LoadLibrary
> >> ("ljackuw").
>
> >> Any ideas?
>
> >> Thanks,
> >> Sam
>
> > One more thing, I seem to be getting back incorrect values for doubles
> > passed by reference. Any suggestions? I am on a 64-bit machine but I
> > should think that should not make a difference.
>
> Hi Sam,
> ctypes is pretty straightforward, and I wouldn't expect it to break on =
=A0
> something simple. I looked over your code (warning -- I am a ctypes =A0
> novice) and it looks OK to me. If you're getting null pointer writes =A0
> I'd suspect that the call signature isn't what you think it is, =A0
> perhaps due to a lack of an extern "C" declaration or something like =A0
> that. In short, I don't think this is a problem in your Python code or =
=A0
> in ctypes.
>
> But since your Python code is the easiest to change, why not do a =A0
> quick test of a minimal example?
>
> def eDigitalIn_test_version(self, channel, idNum =3D None, demo =3D 0, =
=A0
> readD=3D0):
> =A0 =A0 =A0 =A0 =A0ljid =3D ctypes.c_long(42)
> =A0 =A0 =A0 =A0 =A0state =3D ctypes.c_long(999)
>
> =A0 =A0 =A0 =A0 =A0ecode =3D staticLib.ECount(ctypes.byref(ljid), 0, 0, 0=
, =A0
> ctypes.byref(state))
>
> =A0 =A0 =A0 =A0 =A0print ecode
>
> Does that work any better?
>
> You could also try replacing the byref() calls with pointers created =A0
> by ctypes.pointer(). But I suspect that all this will do is give you =A0
> confidence that it isn't your Python code that's wrong.
>
> You might want to write a minimal C program that invokes ECount. That =A0
> would help you to prove whether or not you have a working C (not C++!) =
=A0
> interface for your function.
>
> HTH
> Philip

Hey Philip,

Thank you for your response. It turns out I was calling a function
that I was not intending on calling, so it was not a Python problem.

Thanks,
Sam
0
Samnsparky (25)
8/4/2009 5:23:10 PM
Reply:

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Hello everyone, I came in the other day and opened my PC SAS 9.1, and got the message below in the log. The Enhanced Editor window was not available. If I tried to use the View menu and select Enhanced Editor, the same Write Access Violation repeats in the log. I was prompted to logon to our remote (UNIX) server, and that worked fine (actually the error occurs before the logon prompt). I am able to open the Program Window, just not the Enhanced Editor. Any ideas on what is wrong? By the way, the problem just happened to show up right after a new set of Microsoft patches had been...

Help: Write Access Violation In Task [ MIXED )
Dear friends, I just got the following error message when I invoke the following sas code, who can give me some tips about this error? If I delete the random effect line, then no error message poped up. proc mixed; class subjid trtpn periodn sex; model aval=trtpn periodn sex trtpn*sex; random subjid(periodn)/subject=subjid type=cs; Lsmeans trtpn/cl alpha=0.05; lsmeans sex/cl alpha=0.05; Estimate "Montelukast vs. Salmeterol" trtpn 1 -1/cl alpha=0.05; estimate "Male vs. Female" sex 1 -1/cl alpha=0.05; Run; Thanks for any idea! Stanley 906 proc mixed; 907 ...

Force exception on attribute write access only one object
Hi, for debugging I want to raise an exception if an attribute is changed on an object. Since it is only for debugging I don't want to change the integer attribute to a property. This should raise an exception: myobj.foo=1 Background: Somewhere this value gets changed. But I don't now where. -- Thomas Guettler, http://www.thomas-guettler.de/ E-Mail: guettli (*) thomas-guettler + de On Thu, Jan 8, 2009 at 1:38 AM, Thomas Guettler <hv@tbz-pariv.de> wrote: > Hi, > > for debugging I want to raise an exception if an attribute is > changed on an object. Since it is...

Re: Help: Write Access Violation In Task [ MIXED )
Stanley, First, you can streamline the code a bit and add the NObound option: proc mixed NOBound; class subjid trtpn periodn sex; model aval=trtpn periodn sex trtpn*sex; random subjid(periodn); Lsmeans trtpn sex / diff cl alpha=0.05; Run; ... and if the interaction is signicant, just need Lsmeans trtpn*sex / diff cl alpha=0.05; < the estimate statements do the samething as diff on LSMeans > it would help to know more about the data (counts, distributions, crosstabs, etc.). Robin High UNMC Stanley Wei <medpower@GMAIL.COM> Sent by: "SAS(r) Discussion" <SAS...

error message: Write Access Violation In Task [iml]
Hi, I'm doing some bootstrapping where I'm using the LAV call for median regression. My procedure is to repeated use resampled datasets (that I've already created) and then use the LAV call to get parameter estimates for quantile regressions on each of my datasets. It's been working fine, but now I'm using a slightly different mix of independent variables and at various points in the process I am getting the error message below. Depending on the dependent variable the messages occurs after the 82nd resample, for another dependent variable it occurs with the 568th resamp...

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