I've never really needed to handle command line arguments in FLTK
before because there's always been some menu option or config file.
I was pleasantly surprised at how easy it is once you've managed
to grok the docs, and decided to post this simple example.
Note that the standard Fl::arg() and Fl::args() do not handle
"option=value" but only "option separateValue" so you would have
to code that up yourself, plus any validation of the arguments.
Tested with 1.1.10 and 1.3.x on Linux only.
Enjoy
D.
/*
* example program: decoding additional command line arguments
* save as file.cxx and build using 'fltk-config --compile file.cxx'
*/
#include <FL/Fl.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Window.H>
#include "stdio.h"
#include "string.h"
int helpFlag = 0;
char *optionString = 0;
int arg(int argc, char **argv, int &i)
{
if (strcmp("-h", argv[i]) == 0 || strcmp("--help", argv[i]) == 0) {
helpFlag = 1;
i += 1;
return 1;
}
if (strcmp("-o", argv[i]) == 0 || strcmp("--option", argv[i]) == 0) {
if (i < argc-1 && argv[i+1] != 0) {
optionString = argv[i+1];
i += 2;
return 2;
}
}
return 0;
}
int main(int argc, char** argv)
{
int i = 1;
if (Fl::args(argc, argv, i, arg) < argc)
// note the concatenated strings to give a single format string!
Fl::fatal("error: unknown option: %s\n"
"usage: %s [options]\n"
" -h | --help : print extended help message\n"
" -o | --option # : example option with parameter\n"
" plus standard fltk options\n",
argv[i], argv[0]);
if (helpFlag)
Fl::fatal("usage: %s [options]\n"
" -h | --help : print extended help message\n"
" -o | --option # : example option with parameter\n"
" plus standard fltk options:\n"
"%s\n",
argv[0], Fl::help);
Fl_Window* mainWin = new Fl_Window(300, 200);
Fl_Box* textBox = new Fl_Box(0, 0, 300, 200);
if (optionString != 0)
textBox->label(optionString);
mainWin->show(argc, argv);
return Fl::run();
}
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