Geis

Is impossible to preserve the GeisInstance value between functions/methods

Bug #754135 reported by José Expósito
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Geis
Fix Released
High
Stephen M. Webb
Geis 2.0.11

Bug Description

Hi!

I'm using utouch-geis-dev version 2.0.9 in Natty.

Now is impossible to preserve the value of GeisInstance between the methods of a class or between functions.
I'm trying to make something like this:

  GeisInstance geisInstance;

  void Class::init() {
    // [...]
    if(geis_init(&winInfo, &geisInstance) != GEIS_STATUS_SUCCESS) {
        qFatal("geis_init: Can't initialize utouch-geis");
    }
    // [...]
  }

  void Class::getGestures() {
    // [...]
    geis_event_dispatch(geisInstance);
    // [...]
  }

I also try to make a memcpy, but the definition of GeisInstance:
typedef struct _GeisInstance *GeisInstance;

Makes impossible know the size of _GeisInstance.

I don't know if this problem will have an easy solution...
Greetings!

Related branches

lp:~bregma/geis/lp-754135
Henrik Rydberg (community): Approve
Diff: 287 lines (+183/-9)
5 files modified
ChangeLog (+9/-0)
libutouch-geis/geis_v1.c (+9/-9)
testsuite/geis1/Makefile.am (+1/-0)
testsuite/geis1/check_geis1_api.c (+2/-0)
testsuite/geis1/check_subscription.c (+162/-0)
lp:geis
Revision history for this message
Stephen M. Webb (bregma) wrote :

It's not clear to me what problem you are describing. Certainly you can preserve a GeisInstance between function calls in the same way any other datum is preserved.

Attached is an example C++ program, similar to geistest, wrapping the geis API in a class, preserving the GeisInstance between member function calls.

A GeisInstance is an opaque pointer. You may copy the pointer as much as you wish, but copying the underlying object makes no more sense than copying a FILE object in the C standard IO library.

Changed in utouch-geis:
status: New → Incomplete
Revision history for this message
José Expósito (jose-exposito89) wrote :

Hello Stephen

Your example runs, but I don't why but for me crashes: Segment fault (`core' generated)

I attach a simple example. If I divide the Constructuor and the run function it crahes, but if I merge it I haven't got problems... Probably the problem should be a stupid error...

Revision history for this message
Stephen M. Webb (bregma) wrote :

Yes, the problem is in the persistence of the callback table passed to geis_subscribe().

I'll post a fix soon.

Changed in utouch-geis:
status: Incomplete → In Progress
Revision history for this message
José Expósito (jose-exposito89) wrote :

Thank you very much Stephen, you are the man!

Stephen M. Webb (bregma)
Changed in utouch-geis:
milestone: none → 2.0.11
assignee: nobody → Stephen M. Webb (bregma)
importance: Undecided → High
Stephen M. Webb (bregma)
Changed in utouch-geis:
status: In Progress → Fix Committed
Stephen M. Webb (bregma)
Changed in utouch-geis:
status: Fix Committed → Fix Released
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