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This is clearly something happening in the Delphi evaluator (which is part of the compiler). The odd thing is that if it is, in fact, going through writeobj.c, something is certainly not quite right. If you can reproduce this with a test case, please report it in QualityCentral (http://qc.embarcadero.com).

EEFFACE is the SEH exception code used by C++, which is "leaking" out to some Delphi code (in this case the IDE itself). When the exception code is not a Delphi generated exception or a hardware related exception, Delphi simply maps it to EExternalException.

Allen Bauer 2010-02-04 05:46:46

"When the exception code is not a Delphi generated exception or a hardware related exception, Delphi simply maps it to EExternalException." - Couldn't the IDE be made aware of C++ exceptions? :)

Moritz Beutel 2010-02-04 12:13:39

This is more a matter for the Delphi runtime, and yes, we could make Delphi more aware of the fact that EEFFACE is a C++ exception. The problem is interpreting the payload in a reasonable way. The simplest thing would be to merely map to another exception type like ECPPBuilderException.

Allen Bauer 2010-02-04 16:43:28

On "interpreting the payload": some time ago I wrote such a Delphi wrapper class that mimics a few functions from the C++ RTL and uses them to extract the exception type name and, in the case of a std::exception, the exception message returned by std::exception::what(). It also provides access to the actual C++ exception object so that C++Builder code may perform dynamic exception dispatching in, say, an TApplicationEvents::OnException handler.You can find my wrapper at http://www.audacia-software.de/en/win/bcb/sc.htm#SystemCppException .

Moritz Beutel 2010-02-04 20:28:15

@Allen: I keep getting the "External exception EEFFACE" error when I am automating MS office applications in Delphi 2010. I will eventually get the *Abort/Try Again* options and if I Abort the debugging options are disabled. The only way I can get back to normal is to restart the IDE. I am specifically using the `GetActiveOleObject`/`CreateOleObject` methods, it is definitely being thrown by using either/or.

James 2010-06-04 09:38:12

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