confusion in function declaration vs defination

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Hi I am new in CPP. very confused between declaration and defination of function.
here is my code
file name: pcanlinkerclass.cpp

C#

pCANLinkerClass::pCANLinkerClass()
{
    LoadAPI();
}



void pCANLinkerClass::LoadAPI()

{
    mypcanlinkerfunction();
    qDebug() << "first message";

}

void pCANLinkerClass::mypcanlinkerfunction()
{
    qDebug() << "second message";
}

giving me error "mypcanlinkerfunction" not declared in the scope.

I dont know whats wrong with this code? and how to make it functional.
any help would be appreciated please.

Posted 30-Oct-15 0:56am

Ramiien

Updated 30-Oct-15 0:59am

v2

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Comments

Richard MacCutchan 30-Oct-15 7:14am

Where is the class declaration of pCANLinkerClass?

Ramiien 30-Oct-15 9:34am

i did in .h file

Richard MacCutchan 30-Oct-15 12:24pm

And you think we can somehow read that?

1 solution

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CPallini · Accepted Answer · 2015-10-30T01:08:00

Solution 1

There must be a method with the same name and signature in the pCANLinkerClass class declaration (usually in the header file), e.g.
in pCANLinkerClass header file

C++

class pCANLinkerClass
{
//...
  void mypcanlinkerfunction();
//...
};

Posted 30-Oct-15 1:08am

CPallini

Updated 30-Oct-15 1:10am

v4

Comments

Ramiien 30-Oct-15 7:14am

Thanks bro

CPallini 30-Oct-15 7:18am

You are welcome.

ridoy 30-Oct-15 9:05am

(y)

Ramiien 30-Oct-15 9:05am

I have one question for my clarification only
I need to list all functions of pcanlinkerclass.cpp into header file of the class??
class pCANLinkerClass
{
//...
void func1();
void func2();
void func3();
void func4();
//...
};
or is there some better way to manage these??

CPallini 30-Oct-15 9:06am

Yes, this is the way C++ works. There is no 'better way'.

Ramiien 30-Oct-15 9:30am

If i am using one API
which contain 2 files

Apifile.h
apifile.dll

now i want to call the functions of apifile.h in my file mymainfile.cpp
what i am doing is
#include "Apifile.h" //into mymainfile.cpp

Apifile::apifilefunction()
{
return from API file will come here

}

it will work or not??

CPallini 30-Oct-15 9:34am

If you are using the DLL's API then you include the header file and then call the DLL's functions (i.e. don't define them) in your source file.

Ramiien 30-Oct-15 9:53am

here is function of apifile.h file
///

/// Gets the current status of a PCAN Channel
///

/// <param name="Channel">"The handle of a PCAN Channel"</param>
/// <returns>"A TPCANStatus error code"
TPCANStatus __stdcall CAN_GetStatus(
TPCANHandle Channel)

what i am doing in mymainfile.cpp
----------------------------------
CAN_GetStatus(channel)

correct?