Comments on: Interfacing Python with C using ctypes http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/ In Pursuit of Truth Fri, 09 Apr 2010 10:27:43 +0000 hourly 1 http://wordpress.org/?v=3.4.2 By: prashanthellina http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-32216 prashanthellina Mon, 10 Aug 2009 10:11:10 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-32216 If you need to return a char* from a c function and use that as a python string from python, you should do something like this, <pre lang="c"> char* get_string() { char* string = (char*) malloc(10); strcpy(string, "bingo"); return string } </pre> <br/> from python: <pre lang="python"> >>> libtest.get_string.restype = c_char_p >>> libtest.get_string() 'bingo' </pre> If you need to return a char* from a c function and use that as a python string from python, you should do something like this,

char* get_string()
{
    char* string = (char*) malloc(10);
    strcpy(string, "bingo");
    return string
}

from python:

>>> libtest.get_string.restype = c_char_p
>>> libtest.get_string()
'bingo'
]]> By: Byzantine Reality » Blog Archive » Python’s ctypes package http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-5165 Byzantine Reality » Blog Archive » Python’s ctypes package Wed, 30 Jul 2008 17:38:55 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-5165 [...] need to replace the instance of “c-code.A.dylib” with “libtest.so.1.0″. So just like this tutorial showed me, we will call “LoadLibrary” (done later) to load your C functions which returns a [...] [...] need to replace the instance of “c-code.A.dylib” with “libtest.so.1.0″. So just like this tutorial showed me, we will call “LoadLibrary” (done later) to load your C functions which returns a [...]

]]> By: Byzantine Reality » Blog Archive » Python’s ctypes package http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-4862 Byzantine Reality » Blog Archive » Python’s ctypes package Tue, 22 Jul 2008 11:06:28 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-4862 [...] the instance of “c-code.A.dylib” with “libtest.so.1.0″. So just like this tutorial showed me, we will call “LoadLibrary” (done later) to load your C functions which [...] [...] the instance of “c-code.A.dylib” with “libtest.so.1.0″. So just like this tutorial showed me, we will call “LoadLibrary” (done later) to load your C functions which [...]

]]> By: Byzantine Reality » Blog Archive » Book of the Week: POSA Volume 2 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-4861 Byzantine Reality » Blog Archive » Book of the Week: POSA Volume 2 Tue, 22 Jul 2008 11:04:08 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-4861 [...] not just a C++ book). It’s not like there aren’t other options, however, as SWIG and ctypes (latter is for Python only which we’ll talk more about on Friday) are specifically designed [...] [...] not just a C++ book). It’s not like there aren’t other options, however, as SWIG and ctypes (latter is for Python only which we’ll talk more about on Friday) are specifically designed [...]

]]> By: Sharmila http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-1392 Sharmila Sat, 19 Jan 2008 18:00:55 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-1392 Superb! Will check this out. Superb! Will check this out.

]]> By: venkat http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-1274 venkat Tue, 08 Jan 2008 09:37:39 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-1274 wonderful. wonderful. thank you so much. wonderful. wonderful. thank you so much.

]]> By: prashanthellina http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-1273 prashanthellina Tue, 08 Jan 2008 07:04:09 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-1273 Here is good slide presentation I found about ctypes. <div style="width:425px;text-align:left" id="__ss_22788"><object style="margin:0px" width="425" height="355"><param name="movie" value="http://static.slideshare.net/swf/ssplayer2.swf?doc=c-types-extending-python-16931"/><param name="allowFullScreen" value="true"/><param name="allowScriptAccess" value="always"/><embed src="http://static.slideshare.net/swf/ssplayer2.swf?doc=c-types-extending-python-16931" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object><div style="font-size:11px;font-family:tahoma,arial;height:26px;padding-top:2px;"><a href="http://www.slideshare.net/?src=embed" rel="nofollow"><img src="http://static.slideshare.net/swf/logo_embd.png" style="border:0px none;margin-bottom:-5px" alt="SlideShare"/></a> | <a href="http://www.slideshare.net/gnunify/c-types-extending-python" title="View 'C Types - Extending Python' on SlideShare" rel="nofollow">View</a> | <a href="http://www.slideshare.net/upload" rel="nofollow">Upload your own</a></div></div> Here is good slide presentation I found about ctypes.

]]> By: Sriram Krishnan http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-1271 Sriram Krishnan Tue, 08 Jan 2008 02:05:37 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-1271 Oops! Gotcha. Oops! Gotcha.

]]> By: prashanthellina http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-1267 prashanthellina Tue, 08 Jan 2008 01:41:27 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-1267 Python takes 32 <strong>bytes</strong>! Python takes 32 bytes!

]]> By: Sriram Krishnan http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/comment-page-1/#comment-1263 Sriram Krishnan Mon, 07 Jan 2008 18:16:55 +0000 http://blog.prashanthellina.com/2008/01/07/interfacing-python-with-c-using-ctypes/#comment-1263 I'm unfamiliar with Python's implementation so this may seem naive. Why is it bad to use 32-bits to store a 32-bit integer? What am I missing here? I’m unfamiliar with Python’s implementation so this may seem naive. Why is it bad to use 32-bits to store a 32-bit integer? What am I missing here?

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