[PyQt] unable to retrieve python exception type objects (C api)

[Phil Thompson]

On 7 Mar 2018, at 1:02 pm, Samuel DEBIONNE <samuel.debionne at esrf.fr> wrote:
> 
> Hi,
> 
> Sorry to reopen this old thread, I just wanted to let you know that this bug is still in 4.19.8. The issue is with SIP file that defines an exception and is shared between a couple of different modules.

Works for me. A test that demonstrates the problem please.

Phil

> On 21 Apr 2017, at 1:13 pm, Philip Scott wrote:
> 
> > Hi Folks,
> > > According to the documentation online: SIP generates a Python object > for each exception defined with the %Exception directive. > > These objects are named with the fully qualified exception name (i.e. > including any enclosing scope) prefixed by sipException_. For > example, the type object for enum Except defined in class Klass > issipException_Klass_Except. > > The objects of all imported exceptions are available to handwritten > code. > > This worked for us well in 4.17. I am trying to upgrade to 4.19 and > came across a problem. In 4.19, for a SIP module called say, 'foo,' > there is an #define in sipAPIfoo.h of the form > > #define sipException_my_exception sipExportedExceptions_foo[0] > > However, the array sipExportedExceptions_foo is defined in > 'sipfoocmodule.cpp' but not declared in any header file. > > I managed to work around this in one module by simply declaring it > before my handwritten C code: > > extern PyObject *sipExportedExceptions_foo[3]; > > But unfortunately got completely stuck when I came a cross a SIP file > that was shared between a couple of different modules as the name of > the module it was going to be used in could not be known. The code > looks a bit like this (I believe it was also taken from the PyQt > example documentation somewhere): > > %Exception std::exception(SIP_Exception) /PyName=StdException/ { > %TypeHeaderCode #include <exception> %End %RaiseCode const char* what > = sipExceptionRef.what(); SIP_BLOCK_THREADS > PyErr_SetString(sipException_std_exception, what); > SIP_UNBLOCK_THREADS %End }; > > I wonder if this is related to the incompatibility notes from the > 4.19 release: > > Starting with this version only those type structures needed by the > generated code are automatically available to handwritten code > possibly resulting in compiler errors. Handwritten code should be > changed to call sipFindType() to obtain a pointer to the required > type structure. > > I did try using sipFindType to find my exception type but with no > success, and looking at the generated code I can't see anywhere that > the exceptions are registered in any way except in the python module > dictionary. > > Apologies if this question has been asked already - I did do a quick > ctrl+f of the post titles to the mailing list; I couldn't find a > better way to search. I've been googling for a solid day, I can't > believe this hasn't affected anyone else - perhaps our usage is > non-standard in some way? > > Anyhow, any pointers would be greatly appreciated.
> 
> 
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