How to call a function from another cpp file

[herculis]

hello guys
i want to call a function in one cpp file from another cpp file.
and i have written this function to slot
Can anyone please help me in this

P.S. i have added header file of second file(where the function is) also in the first file.

[anda_skoa]

C++ doesn't make any distinction on where a function is defined.
If it is declared, as it should be for you since you included the header that declares it, just call it.

Cheers,
_

[herculis]

i am calling it in slot but its not working.
means this function is attached to pushbutton, when i click pushbutton its not calling the function.
can you help in this.
Thanks

[aamer4yu]

Can you show some code. Hard to know where you are going wrong

[herculis]

i cant show the code but abstact is as follows
Header.h
{
class ap
void open();
}


call.cpp
include header.h
{
class ap:: open()
{
}
}


on.cpp
include header.h
{
connect(openButton, SIGNAL(clicked()), this, SLOT(open()));
}

I think i am not sure
problem is i am using 'this' in connect command that why its not working what shuld i write instead of that

[west]

1. Inherit QObject.
2. Use Q_OBJECT macro.
3. Declare this function as a slot.

[herculis]

I have written Q_OBJECT in Header.h
and sorry i didnt get what you have written plz can u explain in detail

[anda_skoa]

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

Cheers,
_

[herculis]

i added header file in the program but then also its not working i have to create instance, with this it will work i guess i did that also means i created one object of the class where the function is and put that object in connect commad but its not working please help
can a one give me an exmaple or a link for callin a function from other cpp file so that i will get an idea how to do that.

[anda_skoa]

There is an example in the link I've posted.
Additionally most examples that come with Qt are doing that.

Cheers,
_

[wysota]

can a one give me an exmaple or a link for callin a function from other cpp file so that i will get an idea how to do that.

Here is an example of calling "funToCall()" defined in file1.cpp from within file2.cpp:

file1.cpp:

#include <cstdio>
 
void funToCall() { printf("Someone called?\n"); }

#include <cstdio>

void funToCall() { printf("Someone called?\n"); }

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file1.h:

void funToCall();

void funToCall();

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file2.cpp:

#include "file1.h"
 
void main() {
  funToCall();
}

#include "file1.h"

void main() {
  funToCall();
}

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However I'm sure the question you asked was not really the one you needed to have an answer to.

[herculis]

actually the problem is when i define the class contructor it has arguments in it thats why i am not able to create object.Do you know any solution regrading this how can i create object of a class whose constructor has arguments like bool*a,QWidget *parent = 0
means

ap(bool*a ,QWidget *parent = 0,QObject *parent)

[anda_skoa]

Why would that be a problem?

Just pass the required values, like for any other function.

Cheers,
_

[wysota]

ap(bool*a ,QWidget *parent = 0,QObject *parent)

I'm sure you don't have such constructor as this code wouldn't compile.