Qt-interest Archive, April 2007
[4.2.2] SIGNAL / SLOT with QObject* progressReceiver, const char* progressSlot
Message 1 in thread
Hi Qtees,
I wonder how I can connect a signal to a slot when the slot's receiver
and name are given by QObject* progressReceiver and const char*
progressSlot. I tried to connect like this:
connect(ABC, SIGNAL(someMethod(unsigned int)), progressReceiver,
progressSlot);
... with "progressSlot" being "someMethod(unsigned int)". What I got is
this:
Object::connect: Use the SLOT or SIGNAL macro to connect
XYZWidget::someMethod(unsigned int)
Does anybody know how to do that? Further, this is in the "run" method
of a class derived from QThread. The progressReceiver is an object
"outside" this tread. Therefore I even tried to call "exec()", but that
stopped the tread from execution.
Thanks in advance,
r.
--------------------------------------------------------------------
Rene Kaiser
Institute of Information Systems & Information Management
JOANNEUM RESEARCH Forschungsgesellschaft mbH
Steyrergasse 17, A-8010 Graz, AUSTRIA
phone: +43-316-876-1173 fax: +43-316-876-1191
web: http://www.joanneum.at/iis
e-mail: mailto:rene.kaiser@xxxxxxxxxxx
--------------------------------------------------------------------
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Message 2 in thread
Kaiser, Rene wrote:
> Hi Qtees,
> [...]
>
> connect(ABC, SIGNAL(someMethod(unsigned int)), progressReceiver,
> progressSlot);
>
Did you forgot the SLOT( ... ) here ?!
connect(ABC, SIGNAL(someMethod(unsigned int)), progressReceiver,
SLOT( progressSlot(unsigned int) ) );
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[ signature omitted ]
Message 3 in thread
Proplem here is that the slot's signature comes from the method's parameter, currently "const char* progressSlot". I have no idea how to call connect with that.
Any ideas anyone?
r.
-----Ursprüngliche Nachricht-----
Von: Michael Sprauer [mailto:Michael.Sprauer@xxxxxxxxxxxxxxxxxx]
Gesendet: Donnerstag, 12. April 2007 14:27
An: Qt Interest
Betreff: Re: [4.2.2] SIGNAL / SLOT with QObject* progressReceiver, const char* progressSlot
Kaiser, Rene wrote:
> Hi Qtees,
> [...]
>
> connect(ABC, SIGNAL(someMethod(unsigned int)), progressReceiver,
> progressSlot);
>
Did you forgot the SLOT( ... ) here ?!
connect(ABC, SIGNAL(someMethod(unsigned int)), progressReceiver, SLOT( progressSlot(unsigned int) ) );
--
[ signature omitted ]
Message 4 in thread
Von: "Kaiser, Rene" <Rene.Kaiser@xxxxxxxxxxx>
>
> Proplem here is that the slot's signature comes from the method's
> parameter, currently "const char* progressSlot". I have no idea how to call connect
> with that.
>
> Any ideas anyone?
>
I would say: Read the docs!
Why should it be possible to connect a signal which emits an unsigned int to a slot which needs const char* ? How should this work?
Christian
--
[ signature omitted ]
Message 5 in thread
I would say: Read the ... : )
Joking apart, there seems to be a misunderstanding. As I thought I had explained in the original post, the SLOT I want to connect to doesn't have a "const char*" parameter, but the "const char* progressSlot" value contains the signature of the slot, e.g. "progressSlot(uint)".
I want to do literally the same as the QMenu::addAction method (see below). But what I get is something like this:
Object::connect: Use the SLOT or SIGNAL macro to connect XYZWidget::someMethod(unsigned int)
As said, the connect happens to be inside the run method of a class derived from QThread. I hope that's not the reason for this problem.
Regards,
r.
########################################################################
QAction *QMenu::addAction(const QString &text, const QObject *receiver, const char* member, const QKeySequence &shortcut)
{
QAction *action = new QAction(text, this);
#ifdef QT_NO_SHORTCUT
Q_UNUSED(shortcut);
#else
action->setShortcut(shortcut);
#endif
QObject::connect(action, SIGNAL(triggered()), receiver, member); <--- uses the QObject and const char* parameters!
addAction(action);
return action;
}
########################################################################
-----Ursprüngliche Nachricht-----
Von: Christian Ehrlicher [mailto:Ch.Ehrlicher@xxxxxx]
Gesendet: Donnerstag, 12. April 2007 14:46
An: qt-interest@xxxxxxxxxxxxx
Cc: Kaiser, Rene
Betreff: AW: [4.2.2] SIGNAL / SLOT with QObject* progressReceiver, const char* progressSlot
Von: "Kaiser, Rene" <Rene.Kaiser@xxxxxxxxxxx>
>
> Proplem here is that the slot's signature comes from the method's
> parameter, currently "const char* progressSlot". I have no idea how to
> call connect with that.
>
> Any ideas anyone?
>
I would say: Read the docs!
Why should it be possible to connect a signal which emits an unsigned int to a slot which needs const char* ? How should this work?
Christian
--
[ signature omitted ]
Message 6 in thread
Kaiser, Rene schrieb:
> I would say: Read the ... : )
>
> Joking apart, there seems to be a misunderstanding. As I thought I had explained in the original post, the SLOT I want to connect to doesn't have a "const char*" parameter, but the "const char* progressSlot" value contains the signature of the slot, e.g. "progressSlot(uint)".
>
> I want to do literally the same as the QMenu::addAction method (see below). But what I get is something like this:
>
> Object::connect: Use the SLOT or SIGNAL macro to connect XYZWidget::someMethod(unsigned int)
>
> As said, the connect happens to be inside the run method of a class derived from QThread. I hope that's not the reason for this problem.
>
the SLOT-macro is defined as
#define SLOT(a) "1"#a
So your char* needs to be "1someMethod(uint)" or better create your
char* with the SLOT-macro instead.
Christian
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