How to link one class to another??

[herculis]

Hello guys I am bulding a videoplayer in VC++ and i have build one but i have one problem i have the screen of the player in one layout(class) and the control in other layout(class ).So now i have to link this classes so that when i will hit the play button from control the video shuld play in other layout.
Could anyone please help me in this.
thanks.

[herculis]

Hello guys I am bulding a videoplayer in VC++ and i have build one but i have one problem i have the screen of the player in one layout(class) and the control in other layout(class ).So now i have to link this classes so that when i will hit the play button from control the video shuld play in other layout.
Could anyone please help me in this.
thanks.

[wysota]

Use signals and slots.

[herculis]

Ya i knw i have to use signals and slots and i have used it also but as the video screen code is in diffrent class and signals slots is in different class they cant communicate with each other.
How to do that

[anda_skoa]

Signal/Slot connections do not require both objects to be of the same class.
The only requirement is that both are derived from QObject.

Cheers,
_

[herculis]

class screen
{
code for video output whcih has only screen to show the video
}

class controls
{
It has widgets like play button ,slider etc
and signal slot for play button
connect(playbutton, SIGNAL), this, SLOT));
and function for play .
contols:: play()
{
code to play the video
}
}
and when we run the code then there are two windows(layouts) one has screen and one has all control widgets.Now I want when i click on play button the video shuld play in the other window.but the thing is that play function button dont know that there is a screen class in the code so i want to link it with the class.Previous the screen function was in the same class and it was working fine now its in different class so cant play the video.

[wysota]

Expose signals from one class, slots the other class (and vice versa if needed) and in some piece of code which has knowledge of both the instances (e.g. a window containing/controlling them both), make signal-slot connections between them.

[herculis]

Ya i read the article but How to define signals and slots can you plz give me one short example so that i will know how they are comunicating in different class

[anda_skoa]

connect(c, SIGNAL(play()), s, SLOT(play()));
// c Is an instance of controls
// s is an instance of screen
// controls needs a signal play()
// screen needs a slot play()

connect(c, SIGNAL(play()), s, SLOT(play()));
// c Is an instance of controls
// s is an instance of screen
// controls needs a signal play()
// screen needs a slot play()

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Cheers,
_

[herculis]

I build the instance like
screen c;
control s;
and put it in connect but its not identifying the intance showing error in that and i wrote this connect inctruction in main().

[anda_skoa]

In main.cpp you need to use the fully qualified name for connect, i.e. it is a static method in QObject

QObject::connect(&c, SIGNAL(...), &s, SLOT(...));

QObject::connect(&c, SIGNAL(...), &s, SLOT(...));

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Btw, if you get an error there is not point in just saying you got one without posting it.

Cheers,
_

[anda_skoa]

http://qt-project.org/doc/qt-5/signalsandslots.html

Cheers,
_