[Tutor] Re: [Python-Help] general question about python integration with C

[ET]

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Hello Martin,
Sorry I don't quite get what you say.
Let me put in some sample code here.
I have three files: 
1) mymathtest.py as the python script
2) mymath_wrapper.c as the wrapper file to mymath.c
3) mymath.c is my App.
From what I get, you are saying once I have this, then
I can have 1) and 2) in the one process, and 3) as a
seperate process?  
How? Can you show me a concrete example, may be by
modifying the code I have as in attachment?

--- Martin von Loewis <loewis@informatik.hu-berlin.de>
wrote:
> > I want to test the App program's ability to do
> interprocess
> > communication. The way to do this is to have my C
> driver program in one
> > process and My App program in another process. 
> > But in using Python extendsion to C. How can I
> have the driving
> > programs(python script, C wrapper program)  run in
> one process while my
> > Apps program in another process? Or is there
> something I can do? 
> > If you have run in a similar situation, or you are
> using pyton to drive
> > testing your Apps. What do you suggest?
> 
> You should create a Python module for your C driver
> program. Please
> see the "extending and embedding" Python manual on
> how to create a new
> Python module.
> 
> Then, the C driver code, and the Python script will
> both run in the
> same process; communicating to Your App via
> interprocess
> communication.
> 
> Regards,
> Martin
> 

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--0-424238335-937791418=:11258
Content-Type: text/plain; name="mymathtest.py"
Content-Description: mymathtest.py
Content-Disposition: inline; filename="mymathtest.py"

#!/tools/2.5.1/local/bin/python


if __name__== '__main__':
     import sys
     import mymath_wrapper
     import struct
    
     print 'calling mymath_wrapper.c\n'
     print mymath_wrapper.mymath(1,2)
    
     print '\n'
     
     print 'without recomplilation, calling mymath_wrapper.c again\n'
     print mymath_wrapper.mymath(3,4)
      
     print 'using stucture to packed the init value before send'
     fmt = "l20sf"
     a = 250
     b = 'knight who say ni'
     c = 3.14159011841
     
     packed_data = struct.pack(fmt,a,b,c)
     # print struct.unpack(fmt, packed_data)
     print mymath_wrapper.mystruct(packed_data)
     
     
     

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