Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed3a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.005 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'python,': 0.02; "subject:' ": 0.07; 'etc).': 0.09; 'subject:into': 0.09; 'translate': 0.10; 'cc:addr:python-list': 0.11; 'python': 0.11; '"test"': 0.16; "'c'": 0.16; '*i*': 0.16; '8bit%:32': 0.16; 'cc:name:python list': 0.16; 'char,': 0.16; 'dependency,': 0.16; 'fine.': 0.16; 'luck,': 0.16; 'subject:Adding': 0.16; 'subject:type': 0.16; 'typedef': 0.16; 'types,': 0.16; 'subject:python': 0.16; 'sat,': 0.16; 'wrote:': 0.18; 'trying': 0.19; 'example': 0.22; 'email addr:gmail.com>': 0.22; 'cc:addr:python.org': 0.22; 'this?': 0.23; 'char': 0.24; 'pointer': 0.24; 'test.': 0.24; 'cc:2**0': 0.24; 'class.': 0.26; 'define': 0.26; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'message-id:@mail.gmail.com': 0.30; "i'm": 0.30; 'code': 0.31; 'int,': 0.31; 'object.': 0.31; 'struct': 0.31; 'this.': 0.32; 'another': 0.32; 'basic': 0.35; "can't": 0.35; 'something': 0.35; 'test': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'add': 0.35; 'entry': 0.36; 'thanks': 0.36; 'hi,': 0.36; 'similar': 0.36; 'example,': 0.37; 'turn': 0.37; 'subject:new': 0.38; 'skip:& 10': 0.38; 'jason': 0.38; 'handle': 0.38; 'sure': 0.39; 'how': 0.40; 'skip:\xc2 10': 0.60; 'conversion': 0.61; 'new': 0.61; 'simple': 0.61; 'linked': 0.65; 'skip:\xe2 10': 0.65; 'to:addr:gmail.com': 0.65; 'believe': 0.68; 'mar': 0.68; 'to,': 0.72; 'potentially': 0.81; '2015': 0.84; 'double,': 0.84; 'float,': 0.84; 'struct.': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=1MVZ0ciHCpEVUD3Hh8cQmcjG9uj+b0R6Q2Pfoh5UhJU=; b=llv/9t74xtd179ay7Ams3Arc/X6h3EmWQiyyOxHqXADUCNNyxzFsQv0pYly3YnL+dK vsXon81L1sEx3wMlogpE0ZrJi1eKuRWlF6yrmrQDo2GYNug0Egc9zXbA/JAJow/TIDsB 4D+KoT8dzD6yzJeihnvmYaKdt2TzBlnRn/YxdbxRFbns5lMLELD4AaGP0TaB2TNGMWFj hnHOQHjUZVYPKy/+aEEkAmh3KXAVMVE7M6UVqoC+0pnFt+uG+kG9xHnCsrCC1A8QAG9O PPW9ZxuQqBsXG1Nw416/jP0ayksqz/TDkwW95FGVVF7BnIQpN04q7TA8NrTijBz/zpek QJhA== MIME-Version: 1.0 X-Received: by 10.236.32.4 with SMTP id n4mr18645685yha.128.1425743585262; Sat, 07 Mar 2015 07:53:05 -0800 (PST) In-Reply-To: References: Date: Sat, 7 Mar 2015 10:53:05 -0500 Subject: Re: Adding a 'struct' into new python type From: Jason Swails To: "Lakshmipathi.G" Cc: python list Content-Type: multipart/alternative; boundary=001a11c1bae6f0c2a30510b4cb54 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.19 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 156 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1425743593 news.xs4all.nl 2883 [2001:888:2000:d::a6]:35048 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:87093 --001a11c1bae6f0c2a30510b4cb54 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Sat, Mar 7, 2015 at 4:15 AM, Lakshmipathi.G wrote: > Hi, > > I'm following this example : > http://nedbatchelder.com/text/whirlext.html#h_making_a_type and trying > to add > new data into 'CountDict' type > > Adding a simple 'char' works well. > > typedef struct { > PyObject_HEAD > PyObject * dict; > int count; > char c; //add this and placed an entry into PyMemberDef as T_CHAR. > } CountDict; > > I can access 'c' from python code,no issues so far. > > Now I want to added 'struct type' into this 'CountDict' type. > struct test { > int x; > }; > > typedef struct { > PyObject_HEAD > PyObject * dict; > int count; > char c; > struct test t1; //?? how to add this > } CountDict; > =E2=80=8B=E2=80=8B > =E2=80=8B > =E2=80=8B=E2=80=8B > > =E2=80=8B=E2=80=8B > How to do achieve this? (Due to legacy code dependency, I can't use > =E2=80=8B=E2=80=8B > ctype/cpython etc). > =E2=80=8B=E2=80=8B > thanks for any help/pointers. > =E2=80=8BThe way *I* would do this is turn struct test into another Python = object. Then instead of defining it in CountDict as type "struct test", define it as the PyStructTest that you assigned it to when you turned it into a Python class. For example, in that website you linked to, CountDict was turned into a CountDictType Python type. So do something similar to "test" in which you turn it into a PyStructTest type in the same way. Then declare it as a PyStructTest pointer instead of a struct test. I'm not sure you can get around an approach like this. I believe that in order to access data from Python, it needs to be a Python type. The struct-to-Python-type conversion *knows* how to translate basic types, like char, double, float, int, and long into their Python equivalents; but it can't handle something as potentially complicated as an arbitrary struct. Of course, if all you want to do is access t1 from C, then I think what you have is fine. =E2=80=8BGood luck, Jason --001a11c1bae6f0c2a30510b4cb54 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

<= /div>

On Sat, Mar = 7, 2015 at 4:15 AM, Lakshmipathi.G <lakshmipathi.g@gmail.com>= ; wrote:
Hi,

I'm following this example :
http://nedbatchelder.com/text/whirlext.html#h_making_a_type<= /a> and trying
to add
new data into 'CountDict' type

Adding a simple 'char' works well.

typedef struct {
=C2=A0 =C2=A0PyObject_HEAD
=C2=A0 =C2=A0PyObject * dict;
=C2=A0 =C2=A0int count;
=C2=A0 =C2=A0char c;=C2=A0 //add this and placed an entry into PyMemberDef = as T_CHAR.
} CountDict;

I can access=C2=A0 'c' from python code,no issues so far.

Now I want to added 'struct type' into this 'CountDict' typ= e.
struct test {
int x;
};

typedef struct {
=C2=A0 =C2=A0PyObject_HEAD
=C2=A0 =C2=A0PyObject * dict;
=C2=A0 =C2=A0int count;
=C2=A0 =C2=A0char c;
=C2=A0 =C2=A0struct test t1; //?? how to add this
} CountDict;
=E2=80=8B=E2=80=8B
=E2=80=8B
=C2=A0
=E2= =80=8B=E2=80=8B

=E2= =80=8B=E2=80=8B
How to do achieve this? (Due to legacy code dependency= , I can't use
=E2= =80=8B=E2=80=8B
ctype/cpython etc).
=E2= =80=8B=E2=80=8B
thanks for any help/pointers.



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