Re: How to update both the Console and the GTKMM gui window after running other functions

["L. D. James" <ljames apollo3 com>]

Thanks, Moh.  I had lots of redundancy and other "most likely useless" 
arguments included just to make my original code compile.  I didn't have 
a clear understanding about what was doing what.  I was looking at the 
examples and trying to implement the objective of outputting to both the 
console and gtkmm.

I appreciate all the cleanup that Alan provided, plus a working model.  
At present, if it isn't too much of a distraction to the maillist, I 
appreciate any cleanup advice, or breakdown of which components are 
doing what.

It would be nice if it were stripped down to the bare minimum to achieve 
the objective, which might make it easier for me to understand the 
various components.

At present this is what I have:

// code begin
// --------------------------------------------
#include <gtkmm.h>
#include <iostream>

using namespace std;

class myLabel: public Gtk::Window
{
public:
    myLabel();
    virtual ~myLabel();

protected:
    Gtk::Label m_label;
    string labeltext;
    string newtext;
    void myprocess1();
};

myLabel::myLabel() :
        m_label()
{
    void myprocess1();

    set_title("Gtkmm Programming - C++");
    add(m_label);

    m_label.show();

    Glib::Thread::create(sigc::mem_fun(*this, &myLabel::myprocess1), true);
}

myLabel::~myLabel()
{
}

void myLabel::myprocess1()
{
    labeltext = "About to preform a number of processes.\n";
    labeltext += "Each process may take up to three hours.\n";
    labeltext += "Please carry your daily chores and wait.\n";
    cout << labeltext;
    cout.flush();
    m_label.set_text(labeltext);

    sleep(10); // Back from a three hour function
    newtext = "Back from a three hour function\n";
    labeltext += newtext;
    m_label.set_text(labeltext);
    cout << newtext;
    cout.flush();

    sleep(10); // Back from a three hour function
    newtext = "Back from another three hour function\n";
    labeltext += newtext;
    m_label.set_text(labeltext);
    cout << newtext;
    cout.flush();

    newtext = "Exiting in 1 minute...\n";
    labeltext += newtext;
    m_label.set_text(labeltext);
    cout << newtext;
    cout.flush();
    sleep(60);
    exit(0);
}

int main(int argc, char* argv[])
{
    if (Glib::thread_supported())
        Glib::thread_init();
    else
    {
        cerr << "Threads aren't supported!" << endl;
        exit(1);
    }

    Gtk::Main kit(argc, argv);

    myLabel mylabel;
    Gtk::Main::run(mylabel);
    return 0;
}
// --------------------------------------------
// code end

I had a few parameters ("Hello World") because I thought something had 
to be there (as per the example I was looking at, at the time.  But it 
appears that a lot of the "methods/functions" can just be open and 
closed parentheses, with nothing in it.

I don't know which parts might cause problems down the line, such as 
buffer overflows or memory leaks.

Also, as you see I added and "exit".  I don't know if that will cause a 
problem, or if more cleanup should be done before exiting.  I'm sure a 
lot of cleanup is performed automatically by clicking on the x to exit 
the gui window.

By the way, I was hoping to have something similar to:

Redirect cout to a TextView:
https://mail.gnome.org/archives/gtkmm-list/2007-May/msg00103.html

Not an actually cout redirection, but more less a "gprint()" function 
that would output to the gui window similar to a "cout" outputting to 
the console.

Since I have this current working model to be able to update the gui 
window, I can use it in my current applications, while continuing to 
study on the side how to make my "gprint()" function.

-- L. James

--
L. D. James
ljames apollo3 com
www.apollo3.com/~ljames

On 08/05/2013 09:19 PM, Moh B. wrote:
> And another thing:
> You declared a void myprocess1(void); member function <== WITH void
> parameter list BUT in the myLabel::myLabel() constructor you called the
> myprocess1() WITHOUT any parameter list: This may cause problems to the
> compiler:
>         protected:
>         Gtk::Label m_label;
>         string labeltext;
>         string newtext;
>         void myprocess1(); <== see here
> caution required.
> Good luck.
> ====================
> On Mon, 2013-08-05 at 17:17 -0400, L. D. James wrote:
> > Thanks, Moh.  That resolved the error issue.  As far as I can see,
> > it's functioning perfect!
> >
> > I'll have some questions on Threading.  But I'll reserve this for a
> > new topic.
> >
> > -- L. James