如何在python中运行时捕获断言（在C ++中引起）

Question

I want to embed C++ in python application. I don't want to use Boost library.

If C++ function do assertion, I want to catch it and print error in my python application or get some detailed information like line number in python script that caused error. and main thing is "I want to proceed further in python execution flow"

How can I do it? I can't find any functions to get detailed assertion information in Python API or C++.

C++ Code

void sum(int iA, int iB)
{
    assert(iA + iB >10);
}

Python Code

from ctypes import * 

mydll = WinDLL("C:\\Users\\cppwrapper.dll")

try:
    mydll.sum(10,3)
catch:
print "exception occurred"

# control should  go to user whether exceptions occurs, after exception occurs if he provide yes then continue with below or else abort execution, I need help in this part as well

import re
for test_string in ['555-1212', 'ILL-EGAL']:
    if re.match(r'^\d{3}-\d{4}$', test_string):
        print test_string, 'is a valid US local phone number'
    else:
        print test_string, 'rejected'

Thanks in advance.

Answer 1

This can't really be done in exactly the way you say, (as was also pointed out in the comments).

Once the assertion happens and SIGABRT is sent to the process, it's in the operating system's hands what will happen, and generally the process will be killed.

The simplest way to recover from a process being killed, is to have the process launched by an external process. Like, a secondary python script, or a shell script. It's easy in bash scripting, for instance, to launch another process, check if it terminates normally or is aborted, log it, and continue.

For instance here's some bash code that executes command line $command , logs the standard error channel to a log file, checks the return code (which will be 130 or something for an SIGABRT) and does something in the various cases:

  $command 2> error.log
  error_code="$?"
  if check_errs $error_code; then
    # Do something...
    return 0
  else
    # Do something else...
    return 1
  fi

Where check_errs is some other subroutine that you would write.