Re: Pointers

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Defining:
   ctypedef struct _CMesaDevice
   ctypedef _CMesaDevice * SRCAM

got rid of some problems, sorry I wasn't getting how to use the incomplet
types.

I still have a problem with the void* return type:
 Cannot convert 'void *' to Python object
when I try to do:
...
      cdef void * images
...
      image = SR_GetImage(self.cam, 0)


On Tue, Nov 9, 2010 at 5:56 PM, Javier Correa <[email protected]>wrote:

> The C typedef is:
>
> typedef struct _CMesaDevice *SRCAM;
>
> and I don't have access to _CMesaDevice declaration.
>
> I was trying to use an incomplete type as in
> http://ldots.org/pyrex-guide/4-functions.html#incomplete_types
>
>
> On Tue, Nov 9, 2010 at 5:39 PM, Stefan Behnel <[email protected]> wrote:
>
>> Javier Correa, 09.11.2010 18:16:
>>
>>  I-m new to pyrex and I'm trying to use it to have access to a library
>>> (MesaSR, http://www.mesa-imaging.ch/drivers.php), but I can't make use
>>> of
>>> pointers.
>>>
>>> I can't seem to define a function that one of its arguments it's a
>>> pointer
>>> (a function that initialize the structure). I'm also having troubles with
>>> using the SR_GetImage that returns a void* pointer.
>>>
>>> My code is as follows:
>>>
>>> import numpy
>>>
>>> cdef extern from "libMesaSR.h":
>>>    ctypedef SRCAM
>>>
>>
>> ctypedef SCRAM *what*?
>>
>> Stefan
>>
>
>
>
> --
> Javier Correa
>
> Por favor, no imprimas este e-mail si realmente no lo necesitas...
> Conservar el medio ambiente es nuestra tarea...
> Please, don't print this e-mail if it's not needed... preserve the
> environment is our task...
>
>


-- 
Javier Correa

Por favor, no imprimas este e-mail si realmente no lo necesitas... Conservar
el medio ambiente es nuestra tarea...
Please, don't print this e-mail if it's not needed... preserve the
environment is our task...

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Defining:<div><div>=C2=A0=C2=A0 ctypedef struct _CMesaDevice</div><div>=C2=
=A0=C2=A0 ctypedef _CMesaDevice * SRCAM</div><div><br></div><div>got rid of=
 some problems, sorry I wasn&#39;t getting how to use the incomplet types.<=
/div><div><br></div>
I still have a problem with the void* return type:</div><div><div>=C2=A0Can=
not convert &#39;void *&#39; to Python object</div></div><div>when I try to=
 do:</div><div>...</div><div><div>=C2=A0=C2=A0 =C2=A0 =C2=A0cdef void * ima=
ges</div><div>...</div>
<div>=C2=A0=C2=A0 =C2=A0 =C2=A0image =3D SR_GetImage(self.cam, 0)</div></di=
v><div><br></div><div><br><div class=3D"gmail_quote">On Tue, Nov 9, 2010 at=
 5:56 PM, Javier Correa <span dir=3D"ltr">&lt;<a href=3D"mailto:javier.corr=
[email protected]">[email protected]</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex;">The C typedef is:<div><br></div><div>typede=
f struct _CMesaDevice *SRCAM;</div><div><br></div><div>and I don&#39;t have=
 access to _CMesaDevice declaration.</div>
<div><br></div><div>I was trying to use an incomplete type as in=C2=A0<a hr=
ef=3D"http://ldots.org/pyrex-guide/4-functions.html#incomplete_types" targe=
t=3D"_blank">http://ldots.org/pyrex-guide/4-functions.html#incomplete_types=
</a><div>
<div></div><div class=3D"h5"><br>
<br><div class=3D"gmail_quote">On Tue, Nov 9, 2010 at 5:39 PM, Stefan Behne=
l <span dir=3D"ltr">&lt;<a href=3D"mailto:[email protected]" target=3D"_b=
lank">[email protected]</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">

Javier Correa, 09.11.2010 18:16:<div><br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
I-m new to pyrex and I&#39;m trying to use it to have access to a library<b=
r>
(MesaSR, <a href=3D"http://www.mesa-imaging.ch/drivers.php" target=3D"_blan=
k">http://www.mesa-imaging.ch/drivers.php</a>), but I can&#39;t make use of=
<br>
pointers.<br>
<br>
I can&#39;t seem to define a function that one of its arguments it&#39;s a =
pointer<br>
(a function that initialize the structure). I&#39;m also having troubles wi=
th<br>
using the SR_GetImage that returns a void* pointer.<br>
<br>
My code is as follows:<br>
<br>
import numpy<br>
<br>
cdef extern from &quot;libMesaSR.h&quot;:<br>
 =C2=A0 =C2=A0ctypedef SRCAM<br>
</blockquote>
<br></div>
ctypedef SCRAM *what*?<br><font color=3D"#888888">
<br>
Stefan<br>
</font></blockquote></div><br><br clear=3D"all"><br></div></div><div class=
=3D"im">-- <br>Javier Correa<br><br>Por favor, no imprimas este e-mail si r=
ealmente no lo necesitas... Conservar el medio ambiente es nuestra tarea...=
 <br>
Please, don&#39;t print this e-mail if it&#39;s not needed... preserve the =
environment is our task...<br>
<br>
</div></div>
</blockquote></div><br><br clear=3D"all"><br>-- <br>Javier Correa<br><br>Po=
r favor, no imprimas este e-mail si realmente no lo necesitas... Conservar =
el medio ambiente es nuestra tarea... <br>Please, don&#39;t print this e-ma=
il if it&#39;s not needed... preserve the environment is our task...<br>
<br>
</div>

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