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Re: [cdt-dev] Possible to use the qtc-debugging-helper (Either DSF/CDI)

Thanks for the info. At _some_ level it would seem to be possible to add the functionality (even if it is a plugin of some kind). It would seem that the qtc-debugging-helper library sends back a response to a gdb request for the "value" or maybe the QtCreator gdb wrapper figures out that the user wants to look at a QString and then asks the library to dump the values and such based on the pointer? Dunno. Can't really follow along. I may inquire on the QtCreator Mailing list garner some more info.

Mike Jackson <>

On Apr 9, 2010, at 10:36 AM, <Warren.Paul@xxxxxxxxx> wrote:

We've designed a powerful variable formatter in EDC which does the basics like being able to change the display in the details pain, but also optionally allowing the children of the variable to be changed as well. It also will allow (not fully implemented yet) modifying the value in formatted form. We will have support for Qt types in this solution (also not yet implemented).

Unfortunately I don't think this does much to help you out since EDC doesn't currently work on Mac, only Windows and Linux. It would be great to have someone do a TCF debug agent on Mac though. :) Maybe you can focus your time on that and we'll provide the Qt formatting aspect?

I should mention that we really wanted to and tried to make this feature non-EDC specific, but there were some technically reasons why it wouldn't work that I can't recall right now. :) It may be that only some of it is EDC specific, I'm not sure. David Dubrow might chime in if he's listening.


-----Original Message-----
From: cdt-dev-bounces@xxxxxxxxxxx
[mailto:cdt-dev-bounces@xxxxxxxxxxx] On Behalf Of ext Michael Jackson
Sent: Friday, April 09, 2010 9:20 AM
To: CDT General developers list.
Subject: Re: [cdt-dev] Possible to use the
qtc-debugging-helper (Either DSF/CDI)

I forgot to mention that I am on "that troublesome platform, OS X"
where the only GDB that seems to work is the one from Apple
which is like version 6.3 or something like that so using the
Python Pretty Printers will not work for this particular platform.

Now obviously since QtCreator does this sort of thing DSF GDB
should be able to be made to do it also. I just have
absolutely NO idea where I would start looking. Even a hacked
together proof of concept would motivate me to spend some late
nights getting something together.

Mike Jackson <>

On Apr 9, 2010, at 10:13 AM, Elmenthaler, Jens wrote:

If you use gdb, you might want to check the python pretty printers
being supported by gdb 7.0 and later.

It effectively means to translate your qtc-debugging-helper
library to
python pretty printers, but this might be valuable anyway.

Both gdb integrations (DSF GDB would require the upcoming CDT 7.0)
have basic support for the pretty printers. Basic support means the
info provided by the pretty printers appears in the details pane of
variables and expressions view. But the children and
variables are not
the ones provided by the pretty printers.

I'm working on fully enabling them in the variables and expressions
view (bug302121). That, however, will only work in DSF GDB.


-----Original Message-----
From: cdt-dev-bounces@xxxxxxxxxxx [mailto:cdt-dev-
bounces@xxxxxxxxxxx] On Behalf Of Michael Jackson
Sent: Freitag, 9. April 2010 16:04
To: CDT General developers list.
Subject: [cdt-dev] Possible to use the qtc-debugging-helper (Either

 I do a bunch of Qt programming and I prefer to use Eclipse CDT to
do my programming. The major hurdle that I have currently
is trying
debug Qt based code. Due to the design of the Qt classes when trying
to get the "value" of things like a QString gdb will just
send back a
pointer address that isn't really helpful. With Qt-Creator the
engineers at Nokia have implemented the qtc-debugging-helper library
which your project can link against.

 What I was wondering would be what type of code updates to CDT
(Either in CDI or DSF) would have to go into place in oder to
effectively use the code contained in the qtc-debugging-helper
library? Looking through the qtc-debugging-helper library it seems
there are "pretty-printers" for the Qt Classes which can then be
back to the IDE making the request to display more helpful values
of a
class rather then the internal pointer.

 I am motivated enough to start hacking in CDT to at least figure
out if this type of thing is even possible. Even better
would be some
help from Nokia to point me in the right direction ;-) ***

Mike Jackson            
Principal Software Engineer       mike.jackson@xxxxxxxxxxxxxx
BlueQuartz Software               Dayton, Ohio

*** I know this is basically helping out a rival product
Eclipse CDT) but I think would still be seen as a Win-Win for all
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