porting CPP defines to python

Question

I have a program (written in C/C++) that behaves as a socket server. I'd like to write the client in python. The packets exchanged over the TCP socket follow a "home-made" protocol (simple) using macros defined as #define... in a XXX.h file. I'd like to parse the XXX.h file to generate a equivalent XXX.py The XXX.h file only contains CPP macro definitions (and comments) e.g:

//the following commands are used when talking to the server
//A tcp message is: the command(32bit word) followed by the flags (32 bits)
#define CMD_DO_SOMETHING1  1  //this does something
#define CMD_DO_SOMETHING2  2  //that does something else
 #define FLAG1   0x0001        //These flags are used as parameter in cmd2
 #define FLAG2   0x0002
 #define FLAG3   0x0004
 #define FLAG4   0x0008
 #define TEST_FLAG1(x) (x&FLAG1) //this tests for flag1

I would like to get something like: XXX.py:

CMD_DO_SOMETHING1=1
CMD_DO_SOMETHING2=2
 FLAG1=1
 ...
 def test_flag1(x):
    return(x&flag1)

I have been briefly looking at swig, but was not convinced it really did what I am looking for. Parsing the XXX.h file manually and matching regular expression feels wrong. So does the idea of running CPP on my *.py file. At least, the constant definition should be converted so I don't have to rewrite them twice. Any better ideas?

possible duplicate of Convert C++ Header Files To Python

Marcin
– Marcin

2012-02-23 10:22:06 +00:00
Commented Feb 23, 2012 at 10:22 — Marcin
– Marcin, Commented Feb 23, 2012 at 10:22

Community · Accepted Answer · 2017-05-23 11:48:01Z

3

h2py.py does exactly that. It is included in the Python distribution(*) in Tools/scripts

If you need to convert more than #defines, see the question Convert C++ Header Files To Python

EDIT: (*) It is included at least in the full source distribution.

edited May 23, 2017 at 11:48

CommunityBot

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answered Feb 23, 2012 at 9:59

Janne Karila

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2 Comments

user1159290 Over a year ago

Thanks. I cannot find h2py on my machine (Fedora FC16). YUM does not give me any hint on where to get it from. I nevertheless found the source (copy/paste it) and it does what I want. If you know how I should get h2py more "cleanly" let me know. and thanks for your answer.

Janne Karila Over a year ago

@user1159290 There is a separate package, python-tools I think, for Fedora. But you don't need more than the script itself.

Marcin · Accepted Answer · 2012-02-23 09:24:20Z

1

Why wouldn't you use the macro pre-processor to do this? This is what they are for.

answered Feb 23, 2012 at 9:24

Marcin

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