Styjun

Gory anime with pink haired girl escaping an asylum

Why do airports remove/realign runways?

Groups where no elements commute except for the trivial cases

Why do Martians have to wear space helmets?

How to find the version of extensions used on a Joomla website without access to the backend?

How do amateur satellites stay consistently in the amateur-sat bands acoss the globe?

How would a sea turtle end up on its back?

What is this airplane with small wings at different angles seen at Paphos Airport?

Bringing coumarin-containing liquor into the USA

Why do Klingons use cloaking devices?

Is it acceptable that I plot a time-series figure with years increasing from right to left?

Do I need transit visa for Dublin?

Shipped package arrived - didn't order, possible scam?

How did Einstein know the speed of light was constant?

Minor differences between two recorded guitars

How to get the speed of my spaceship?

Why does this function pointer assignment work when assigned directly but not with the conditional operator?

Array or vector? Two dimensional array or matrix?

How to play a D major chord lower than the open E major chord on guitar?

Howto display unicode character u2026 in terminal mode in emacs

When moving a unique_ptr into a lambda, why is it not possible to call reset?

Do Goblin tokens count as Goblins?

Taking my Ph.D. advisor out for dinner after graduation

Any way to meet code with 40.7% or 40.44% conduit fill?

Writing a callback function in Python to be consumed by a C routine in a loaded API. Callback function has va_list

Writing Python ctypes for Function pointer callback function in Cmkdir -p functionality in PythonWhat is a callback function?Wrapping a C library in Python: C, Cython or ctypes?Why do people write the #!/usr/bin/env python shebang on the first line of a Python script?How to return value from an asynchronous callback function?How to get contents of va_list in Python?Why does Python code run faster in a function?Can I create a prototype for a variadic Python function using ctypes so that a DLL can call this function as a callback?How do I convert an existing callback API to promises?Python Ctypes register callback functions

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

1

There seems to be some ideas in writing Python callback functions to be consumed by a load C api: Writing Python ctypes for Function pointer callback function in C

Thanks! This is useful.

I have some callback functions that are of the form:

LogCallback(enum messtype, OurNode *node, OurLink *link, OurContract *contract, char *format, va_list argptr)

I am mainly interested in how a python routine can be made to have a va_list such that it can be sent to an API call as a callback function.

Clarification: The callback function format calls for a va_list, so a Python function built to act as a callback function would need to function in the C routines that take in and run this function (pointer).

python c callback

share|improve this question

edited Mar 26 at 13:09

Jiminion

asked Mar 25 at 20:40

JiminionJiminion

3,84111 gold badge1717 silver badges4040 bronze badges

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I would expect you need to find a way to bind LogCallback_wrapper(enum messtype, OurNode *, OurLink *, OurContract *, char *, ...), which can then construct the va_list correctly and invoke LogCallback.
  
  – paddy
  Mar 25 at 21:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think paddy's got it, I don't think you'll find any sensible way of constructing va_list in ctypes.
  
  – Antti Haapala
  Mar 25 at 21:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  or do you mean that you need to code a Python function that takes in va_list and processes it? That's 99 % impossibility... or at least 100 % masochism :D
  
  – Antti Haapala
  Mar 25 at 21:18
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Actually re-reading the question... it is unclear what do you need, perhaps some code would clarify.
  
  – Antti Haapala
  Mar 25 at 21:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Nothing would stop you from writing a C function to convert format and argptr into, say, a tuple which could be passed to whatever Python function. Doing it entirely via ctypes is likely to be painful.
  
  – Davis Herring
  Mar 25 at 22:51
  

  
  
  
  

 | 
show 1 more comment

1

There seems to be some ideas in writing Python callback functions to be consumed by a load C api: Writing Python ctypes for Function pointer callback function in C

Thanks! This is useful.

I have some callback functions that are of the form:

LogCallback(enum messtype, OurNode *node, OurLink *link, OurContract *contract, char *format, va_list argptr)

I am mainly interested in how a python routine can be made to have a va_list such that it can be sent to an API call as a callback function.

Clarification: The callback function format calls for a va_list, so a Python function built to act as a callback function would need to function in the C routines that take in and run this function (pointer).

python c callback

share|improve this question

edited Mar 26 at 13:09

Jiminion

asked Mar 25 at 20:40

JiminionJiminion

3,84111 gold badge1717 silver badges4040 bronze badges

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I would expect you need to find a way to bind LogCallback_wrapper(enum messtype, OurNode *, OurLink *, OurContract *, char *, ...), which can then construct the va_list correctly and invoke LogCallback.
  
  – paddy
  Mar 25 at 21:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think paddy's got it, I don't think you'll find any sensible way of constructing va_list in ctypes.
  
  – Antti Haapala
  Mar 25 at 21:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  or do you mean that you need to code a Python function that takes in va_list and processes it? That's 99 % impossibility... or at least 100 % masochism :D
  
  – Antti Haapala
  Mar 25 at 21:18
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Actually re-reading the question... it is unclear what do you need, perhaps some code would clarify.
  
  – Antti Haapala
  Mar 25 at 21:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Nothing would stop you from writing a C function to convert format and argptr into, say, a tuple which could be passed to whatever Python function. Doing it entirely via ctypes is likely to be painful.
  
  – Davis Herring
  Mar 25 at 22:51
  

  
  
  
  

 | 
show 1 more comment

There seems to be some ideas in writing Python callback functions to be consumed by a load C api: Writing Python ctypes for Function pointer callback function in C

Thanks! This is useful.

I have some callback functions that are of the form:

LogCallback(enum messtype, OurNode *node, OurLink *link, OurContract *contract, char *format, va_list argptr)

I am mainly interested in how a python routine can be made to have a va_list such that it can be sent to an API call as a callback function.

Clarification: The callback function format calls for a va_list, so a Python function built to act as a callback function would need to function in the C routines that take in and run this function (pointer).

python c callback

share|improve this question

edited Mar 26 at 13:09

Jiminion

asked Mar 25 at 20:40

JiminionJiminion

3,84111 gold badge1717 silver badges4040 bronze badges

share|improve this question

edited Mar 26 at 13:09

Jiminion

asked Mar 25 at 20:40

JiminionJiminion

3,84111 gold badge1717 silver badges4040 bronze badges

share|improve this question

edited Mar 26 at 13:09

Jiminion

asked Mar 25 at 20:40

JiminionJiminion

3,84111 gold badge1717 silver badges4040 bronze badges

asked Mar 25 at 20:40

JiminionJiminion

3,84111 gold badge1717 silver badges4040 bronze badges

asked Mar 25 at 20:40

JiminionJiminion

3,84111 gold badge1717 silver badges4040 bronze badges