Signal defined in "a.h" can not emit in "b.cpp"

[wysota]

Create a public method in A that will emit the signal.

class A : public QObject {
  Q_OBJECT
public:
  A(QObject *parent=0) : QObject(parent){}
  void emitSig(){ emit sig(); }
signals:
 void sig();
};

class A : public QObject {
  Q_OBJECT
public:
  A(QObject *parent=0) : QObject(parent){}
  void emitSig(){ emit sig(); }
signals:
 void sig();
};

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BTW. You should avoid emitting signals on account of other objects behind their back. If you do that, it's likely that your design is incorrect.

[Shawn]

can i do it like this?
A a;
B b;
connect (&a, Sgl_a(),&b, Sgl_b());

I tried, but still:
error C3861: 'connect': identifier not found

I am totally confused

[wysota]

What is Sgl_a() ? Remember about SIGNAL() and SLOT() macros.

[Shawn]

What is Sgl_a() ? Remember about SIGNAL() and SLOT() macros.

of course i won't make that mistake
that is just an example

[high_flyer]

can i do it like this?
A a;
B b;
connect (&a, Sgl_a(),&b, Sgl_b());

I tried, but still:
error C3861: 'connect': identifier not found

of course i won't make that mistake
that is just an example

We can't know what you are thinking.
And we don't know which mistakes you might make or not - and judging from your post, you are not a very experienced Qt programmer, so you might be doing all kinds of mistakes you are not aware of (and neither are we, if we don't see the code).
And when dealing with a problem, anything can be a cause, so if you want us to be able to help you, should should deliver as accurate information as you can.
Why don't you just post the code?
(And I don't mean just a signal definition line - but your header and the implementation files that are in question).

Oh - and when posting code, please, use code tags.

[jpn]

error C3861: 'connect': identifier not found

QObject::connect() is a static method of QObject. Sounds like you try to connect outside a QObject, so try:

QObject::connect(...);

QObject::connect(...);

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QObject header should already be included at least indirectly as both A and B are QObjects.