[PyQt] SIP exception handling

[Qin Shen]

Hi there,

I'm fairly new on SIP and haven't done any development on PyQt.
But I'm using SIP to write a python wrapper for our C++ library.

I have tried to translate the C++ exceptions to Python exceptions.
So far I managed to get it to work, but I had to change the
auto-generated sipcode, which is not what I wanted. The following
is what I did, could any of you tell me what I have missed and
how I can avoid manually changing the generated sipcode?


(1) The .sip file
--------------------------------------------------
%Exception TipShotgun::Shotgun::Exception(SIP_Exception) 
/PyName=ShotgunException/
{
%TypeHeaderCode
#include <TipShotgun/Shotgun.h>
%End
%RaiseCode
        const char *detail = sipExceptionRef.what();

        SIP_BLOCK_THREADS
        PyErr_SetString(sipException_TipShotgun_Shotgun_Exception, detail);
        SIP_UNBLOCK_THREADS
%End
};


(2) I run "sip" command with the "-e" flag which enables the support
    for C++ exceptions. The auto-generated sip .cpp code looks like
    this BEFORE I made any changes manually.
--------------------------------------------------
    try
    {
       sipRes = new std::string(sipCpp->sgRole());
    }
    catch (...)
    {
       sipRaiseUnknownException();
       return NULL;
    }


(3) Here is the sip .cpp code AFTER I added the changes.
---------------------------------------------------------
    try
    {
       sipRes = new std::string(sipCpp->sgRole());
    }
    catch (TipShotgun::Shotgun::Exception &error)
    {
       PyErr_SetString(sipException_TipShotgun_Shotgun_Exception, 
error.what());
       return NULL;
    }
    catch (...)
    {
       sipRaiseUnknownException();
       return NULL;
    }


(4) My python test script
----------------------------------------------------------
#!/usr/bin/env python

from _shotgun import *
sg = TipShotgun.Shotgun()
user = sg.findUserByLogin("farny")
try:
    role = user.sgRole()
except ShotgunException, err:
    print err

print
print "THE END OF TEST"

-------------------------------------------------------
With (1), (3) & (4), everything works fine. Without the manual updates made
to the sip .cpp code, it just won't work. Any help will be greatly 
appreciated.

Thanks,

-Jean