LinuxQuestions.org - gtkmm help

Hi! I'm having trouble compiling a very simple gtkmm application. I'm new to gtkmm. I have a class named HelloWorld. It is a window with a button. There are 3 files: helloworld.h, helloworld.cc, main.cc. I can't seem to compile helloworld.cc. Here's how I tried to compile it (not linking yet):

g++ -o helloworld.o -c helloworld.cc `pkg-config gtkmm-2.4 --cflags`

I get this message:
helloworld.cc:6: error: `Helloworld' has not been declared
helloworld.cc:7: error: ISO C++ forbids declaration of `Helloworld' with no type
helloworld.cc: In function `int Helloworld()':
helloworld.cc:7: error: only constructors take base initializers
helloworld.cc:9: error: `set_border_width' undeclared (first use this function)
helloworld.cc:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
helloworld.cc:10: error: `m_button' undeclared (first use this function)
helloworld.cc:10: error: invalid use of `this' in non-member function
helloworld.h:13: error: `virtual void HelloWorld::on_button_clicked()' is protected
helloworld.cc:10: error: within this context
helloworld.cc:11: error: `add' undeclared (first use this function)

Here's my code.

helloworld.h

Code:

#include <gtkmm/button.h>

#include <gtkmm/window.h>



using namespace Gtk;



class HelloWorld : public Gtk::Window

{

public:

  HelloWorld();

  virtual ~HelloWorld();



protected:

  virtual void on_button_clicked();

  Button m_button;

};

helloworld.cc

Code:

#include "helloworld.h"

#include <iostream>



using namespace std;



Helloworld::Helloworld()

  :  m_button( "Hello World" )

{

  set_border_width( 10 );

  m_button.signal_clicked().connect( sigc::mem_fun( *this, &HelloWorld::on_button_clicked ));

  add( m_button );

  m_button.show();

}



HelloWorld::~HelloWorld()

{

}



void HelloWorld::on_button_clicked()

{

  cout << "Hello World" << endl;

}

main.cc

Code:

#include <gtkmm/main.h>

#include "helloworld.h"



using namespace Gtk;



int main( int argc, char** argv )

{

  Main kit( argc, argv );

  HelloWorld helloworld;

  Main::run( helloworld );



  return 0;

}

Is there something wrong with the code or with how I compiled it? I'm sure I installed gtkmm properly. I can compile and run if everything was in one big file, not separated into headers and cc's anymore.