<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML xmlns="http://www.w3.org/TR/REC-html40" xmlns:v =
"urn:schemas-microsoft-com:vml" xmlns:o =
"urn:schemas-microsoft-com:office:office" xmlns:w =
"urn:schemas-microsoft-com:office:word" xmlns:m =
"http://schemas.microsoft.com/office/2004/12/omml"><HEAD>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.2900.3268" name=GENERATOR><!--[if !mso]>
<STYLE>v\:* {
BEHAVIOR: url(#default#VML)
}
o\:* {
BEHAVIOR: url(#default#VML)
}
w\:* {
BEHAVIOR: url(#default#VML)
}
.shape {
BEHAVIOR: url(#default#VML)
}
</STYLE>
<![endif]-->
<STYLE>@font-face {
font-family: Calibri;
}
@font-face {
font-family: Tahoma;
}
@font-face {
font-family: Consolas;
}
@page Section1 {size: 612.0pt 792.0pt; margin: 72.0pt 72.0pt 72.0pt 72.0pt; }
P.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Times New Roman","serif"
}
LI.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Times New Roman","serif"
}
DIV.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Times New Roman","serif"
}
A:link {
COLOR: blue; TEXT-DECORATION: underline; mso-style-priority: 99
}
SPAN.MsoHyperlink {
COLOR: blue; TEXT-DECORATION: underline; mso-style-priority: 99
}
A:visited {
COLOR: purple; TEXT-DECORATION: underline; mso-style-priority: 99
}
SPAN.MsoHyperlinkFollowed {
COLOR: purple; TEXT-DECORATION: underline; mso-style-priority: 99
}
P.MsoPlainText {
FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: Consolas; mso-style-priority: 99; mso-style-link: "Plain Text Char"
}
LI.MsoPlainText {
FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: Consolas; mso-style-priority: 99; mso-style-link: "Plain Text Char"
}
DIV.MsoPlainText {
FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: Consolas; mso-style-priority: 99; mso-style-link: "Plain Text Char"
}
SPAN.gmailquote {
mso-style-name: gmail_quote
}
SPAN.EmailStyle18 {
COLOR: #1f497d; FONT-FAMILY: "Calibri","sans-serif"; mso-style-type: personal-reply
}
SPAN.PlainTextChar {
FONT-FAMILY: Consolas; mso-style-priority: 99; mso-style-link: "Plain Text"; mso-style-name: "Plain Text Char"
}
.MsoChpDefault {
FONT-SIZE: 10pt; mso-style-type: export-only
}
DIV.Section1 {
page: Section1
}
</STYLE>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></HEAD>
<BODY lang=EN-US vLink=purple link=blue>
<DIV dir=ltr align=left><SPAN class=624484514-12032008><FONT face=Arial
color=#0000ff size=2>The short answer is that you don't need
to:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=624484514-12032008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=624484514-12032008><FONT face=Arial
color=#0000ff size=2>Anything that has a 'handle' attribute that is an
int should be fine to pass into the function, and your typemap will be fine
(with some additional checking)</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=624484514-12032008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=624484514-12032008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=624484514-12032008><FONT face=Arial
color=#0000ff size=2>If you really insist on absolute type safety, however,
you'll need an instance of the Pin class to compare to. Actually, all you need
is an instance of the Pin Type -- you can use PyObject_TypeCheck (if I
recall).</FONT></SPAN></DIV>
<DIV><SPAN class=624484514-12032008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=624484514-12032008><FONT face=Arial color=#0000ff
size=2>Chances are, the name 'Pin' is already in your locals or globals, so
you find the object, grab its type, and then check the type.</FONT></SPAN></DIV>
<DIV><SPAN class=624484514-12032008><FONT face=Arial color=#0000ff
size=2>Personally, I wouldn't bother.</FONT></SPAN></DIV>
<DIV><SPAN class=624484514-12032008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=624484514-12032008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=624484514-12032008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=624484514-12032008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><BR></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Cooper, Andrew [mailto:ACooper@cimtek.com]
<BR><B>Sent:</B> Tuesday, March 11, 2008 7:34 PM<BR><B>To:</B>
python-list@python.org<BR><B>Subject:</B> RE: Obtaining the PyObject * of a
class<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoPlainText>The part I’m having problem with is as
follows:<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>I want to replace the ‘strcmp’ below with a call to
PyObject_IsInstance(o, pinClassPyObject)<o:p></o:p></P>
<P class=MsoPlainText>But I don’t know how to get the PyObject* for the Pin
class that is defined in the %pythoncode section<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>Here is a cut down version of the interface
file<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>%module example<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>typedef long pin;<o:p></o:p></P>
<P class=MsoPlainText>typedef unsigned short ushort;<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>ushort wkDefinePin(char *, char *, pin
*OUTPUT);<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>%pythoncode<o:p></o:p></P>
<P class=MsoPlainText>{<o:p></o:p></P>
<P class=MsoPlainText> class Pin(object):<o:p></o:p></P>
<P class=MsoPlainText> def __init__(self, name,
tic):<o:p></o:p></P>
<P class=MsoPlainText> self.handle =
wkDefinePin(name,tic)[1]<o:p></o:p></P>
<P class=MsoPlainText>
return <o:p></o:p></P>
<P class=MsoPlainText>}
<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>%typemap(in) (pin tp)<o:p></o:p></P>
<P class=MsoPlainText>{<o:p></o:p></P>
<P class=MsoPlainText> //<o:p></o:p></P>
<P class=MsoPlainText> // TODO: really need to change this to IsInstance
type code<o:p></o:p></P>
<P class=MsoPlainText> //<o:p></o:p></P>
<P class=MsoPlainText> if(strcmp($input->ob_type->tp_name,"Pin") ==
0)<o:p></o:p></P>
<P class=MsoPlainText> {<o:p></o:p></P>
<P class=MsoPlainText> $1 =
PyInt_AsLong(PyObject_GetAttrString($input,"handle"));<o:p></o:p></P>
<P class=MsoPlainText> }<o:p></o:p></P>
<P class=MsoPlainText> else<o:p></o:p></P>
<P class=MsoPlainText> {<o:p></o:p></P>
<P class=MsoPlainText> PyErr_SetString(PyExc_TypeError,"arg
must be type Pin");<o:p></o:p></P>
<P class=MsoPlainText> return NULL;<o:p></o:p></P>
<P class=MsoPlainText> }<o:p></o:p></P>
<P class=MsoPlainText>}<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>%typemap(in) (int nCnt_tp, pin *tp)<o:p></o:p></P>
<P class=MsoPlainText>{<o:p></o:p></P>
<P class=MsoPlainText> /* Check if is a list */<o:p></o:p></P>
<P class=MsoPlainText> if (PyList_Check($input))<o:p></o:p></P>
<P class=MsoPlainText> {<o:p></o:p></P>
<P class=MsoPlainText> int i;<o:p></o:p></P>
<P class=MsoPlainText> $1 =
PyList_Size($input);<o:p></o:p></P>
<P class=MsoPlainText> $2 = (pin *) malloc(($1) *
sizeof(pin));<o:p></o:p></P>
<P class=MsoPlainText> for (i = 0; i < $1; i++)
<o:p></o:p></P>
<P class=MsoPlainText> {<o:p></o:p></P>
<P class=MsoPlainText> //<o:p></o:p></P>
<P class=MsoPlainText> // TODO: really need to
change this to IsInstance type code<o:p></o:p></P>
<P class=MsoPlainText> //<o:p></o:p></P>
<P class=MsoPlainText> PyObject *o =
PyList_GetItem($input,i);<o:p></o:p></P>
<P class=MsoPlainText> if
(strcmp(o->ob_type->tp_name, "Pin") == 0)<o:p></o:p></P>
<P class=MsoPlainText> {<o:p></o:p></P>
<P class=MsoPlainText> $2[i] =
PyInt_AsLong(PyObject_GetAttrString(o,"handle"));<o:p></o:p></P>
<P class=MsoPlainText> }<o:p></o:p></P>
<P class=MsoPlainText> else <o:p></o:p></P>
<P class=MsoPlainText> {<o:p></o:p></P>
<P class=MsoPlainText>
PyErr_SetString(PyExc_TypeError,"list must contain Pins");<o:p></o:p></P>
<P class=MsoPlainText>
free($2);<o:p></o:p></P>
<P class=MsoPlainText> return
NULL;<o:p></o:p></P>
<P class=MsoPlainText> }<o:p></o:p></P>
<P class=MsoPlainText> }<o:p></o:p></P>
<P class=MsoPlainText> $2[i] = 0;<o:p></o:p></P>
<P class=MsoPlainText> }<o:p></o:p></P>
<P class=MsoPlainText> else<o:p></o:p></P>
<P class=MsoPlainText> {<o:p></o:p></P>
<P class=MsoPlainText> PyErr_SetString(PyExc_TypeError,"not a
list");<o:p></o:p></P>
<P class=MsoPlainText> return NULL;<o:p></o:p></P>
<P class=MsoPlainText> }<o:p></o:p></P>
<P class=MsoPlainText>}<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>-- <o:p></o:p></P>
<P class=MsoNormal><A
href="http://mail.python.org/mailman/listinfo/python-list">http://mail.python.org/mailman/listinfo/python-list</A><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0cm; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
python-list-bounces+acooper=cimtek.com@python.org
[mailto:python-list-bounces+acooper=cimtek.com@python.org] <B>On Behalf Of
</B>Bronner, Gregory<BR><B>Sent:</B> 11 March 2008 20:52<BR><B>To:</B> Michael
Wieher; python-list@python.org; accooper@cimtek.com<BR><B>Subject:</B> RE:
Obtaining the PyObject * of a class<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">I'd
strongly disagree.</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">SWIG is
very useful for wrapping large scale projects in a non-interfering manner. If
you have to generate bindings for 1000+ classes, it is by far the easiest way to
do things.</SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">It isn't
clear what you are doing that requires the PyObject*, or which one you'd
like.</SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">In
general, the output one is found in $result, and $input is input PyObject for
that typemap.</SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center>
<HR align=center width="100%" SIZE=2>
</DIV>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> Michael Wieher
[mailto:michael.wieher@gmail.com] <BR><B>Sent:</B> Tuesday, March 11, 2008 3:09
PM<BR><B>To:</B> python-list@python.org<BR><B>Subject:</B> Re: Obtaining the
PyObject * of a class</SPAN><o:p></o:p></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt">2 things:<BR><BR>1st. there is a
python mailing list for people interested in C++ extension type stuff<BR>2nd.
SWIG is useless and overly complicated, its much easier to just generate your
own C++ code by hand, less confusion, and much more clarity. I find no
value in using anything else.<BR>People complain about the "boilerplate" code,
but honestly, copy & paste, change three characters, and you're done.
And you know exactly what is happening, how when and why.<o:p></o:p></P>
<DIV>
<P class=MsoNormal><SPAN class=gmailquote>2008/3/11, Chris Mellon <<A
href="mailto:arkanes@gmail.com">arkanes@gmail.com</A>>:</SPAN>
<o:p></o:p></P>
<P class=MsoNormal>On Tue, Mar 11, 2008 at 12:13 PM, Terry Reedy <<A
href="mailto:tjreedy@udel.edu">tjreedy@udel.edu</A>>
wrote:<BR>><BR>> "Cooper, Andrew" <<A
href="mailto:ACooper@cimtek.com">ACooper@cimtek.com</A>> wrote in
message<BR>> news:C03234BF0E2A8C419C4C307D0914EB730251D3A9@MAILSERVER.cimtek.on.ca...<BR>><BR>>
| Are there any Python C API experts/SWIG experts out there that can
help<BR>> | me with this issue please.<BR>><BR>> | I',m
currently using SWIG to generate a python interface to a C
DLL.<BR>><BR>> Some people have switched to using ctypes for
this, and many other SWIG<BR>> users have stopped reading
clp. But I hope someone answers who can.<BR>><BR><BR><BR>Using
Pyrex or Cython is likely to be much easier than using SWIG for
this.<BR><BR>--<BR><A
href="http://mail.python.org/mailman/listinfo/python-list">http://mail.python.org/mailman/listinfo/python-list</A><o:p></o:p></P></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - This message is intended only for the personal and
confidential use of the designated recipient(s) named above. If you are not the
intended recipient of this message you are hereby notified that any review,
dissemination, distribution or copying of this message is strictly prohibited.
This communication is for information purposes only and should not be regarded
as an offer to sell or as a solicitation of an offer to buy any financial
product, an official confirmation of any transaction, or as an official
statement of Lehman Brothers. Email transmission cannot be guaranteed to be
secure or error-free. Therefore, we do not represent that this information is
complete or accurate and it should not be relied upon as such. All information
is subject to change without notice. -------- IRS Circular 230 Disclosure:
Please be advised that any discussion of U.S. tax matters contained within this
communication (including any attachments) is not intended or written to be used
and cannot be used for the purpose of (i) avoiding U.S. tax related penalties or
(ii) promoting, marketing or recommending to another party any transaction or
matter addressed herein. <o:p></o:p></P></DIV></BODY></HTML>
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This message is intended only for the personal and confidential use of the designated recipient(s) named above. If you are not the intended recipient of this message you are hereby notified that any review, dissemination, distribution or copying of this message is strictly prohibited. This communication is for information purposes only and should not be regarded as an offer to sell or as a solicitation of an offer to buy any financial product, an official confirmation of any transaction, or as an official statement of Lehman Brothers. Email transmission cannot be guaranteed to be secure or error-free. Therefore, we do not represent that this information is complete or accurate and it should not be relied upon as such. All information is subject to change without notice.
--------
IRS Circular 230 Disclosure:
Please be advised that any discussion of U.S. tax matters contained within this communication (including any attachments) is not intended or written to be used and cannot be used for the purpose of (i) avoiding U.S. tax related penalties or (ii) promoting, marketing or recommending to another party any transaction or matter addressed herein.