FLTK GUI

Simple FLTK tutorial using Bloodshed Dev-C++ with MinGw

Download Software

Get the latest version of Bloodshed Dev-C++ with Mingw/GCC from (~9 MB):
http://www.bloodshed.net/dev/devcpp.html
or v-4.9.9.2 directly from:
http://prdownloads.sourceforge.net/dev-cpp/devcpp-4.9.9.2_setup.exe

Install in an appropriate place.

After starting the program the first thing you need to do is to download the FLTK library. Go to “Tools->Check for updates / packages”.

File:Webupdata.bmp

Select devpak server “devpaks.org Community Devpaks” click “Check for updates” and check the fltk version 1.1.7 and click “Download selected” and continue with the installation of the library. 1.1.7 is a stable version of the FLTK library. FLTK2 is still a beta release.

Start a new FLTK project

Start Bloodshed Dev-C++ and start a new project “File->new-> project”. Choose “Empty Project” and give the project a name.

File:Newproject.bmp

Add a new source file to the project “File->new->Source File”. Save file as main.cpp.

In order to setup the FLTK library for the project go to “Project->Project options” and add the following under the Parameters tab:

Compiler: -DWIN32 -mms-bitfields 
Linker: -lfltk -lole32 -luuid -lcomctl32 -lwsock32 –lm

File:Project options.bmp

Under the General tab choose Win32 GUI.

File:Project options2.bmp

The quick way of creating a FLTK project

“File->new-> project” and choose GUI and FLTK. This will automatically set up the linking and compiler setttings. File:Newproject2.bmp

Develop code

Create a new source file and write the following code:

#include !<FL/Fl.H>
#include \<FL/Fl_Window.H>


int main (int argc , int **argv)
{
    Fl_Window win(400,200,"Test");  //win(width, height,name)
    win.show();                     // show window
    return(Fl::run());              //fltk application loop
    
}

Save and press F9 (Compile & Run) and a simple window will be created.

File:Simplewindow.JPG

Create a simple window with a button

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>

void but_cb(Fl_Widget* w, void*){
      Fl_Button *b= (Fl_Button*)w;
      if (b->label() == "Off") {
         b->label("On");
      }else{
         b->label("Off");        
      }
}

int main (int argc , int **argv)
{
    Fl_Window win(400,200,"Test");  //win(width, height,name)
    Fl_Button but(100,50,70,30,"On");
    
    win.show();
                         // show window
    but.callback(but_cb);    
    
    
    return(Fl::run());              //fltk application loop   
}

File:Windowwithbutton.jpg