> Be aware that if you need trailing [non-option] arguments, such as
> filenames, that you need to put an explicit '--' in the command line.
AND you also have to modify the code in howto-parse-args.cxx too.
I append a more complete version that handles decoding options, '--'
and a trailing filename. It allows:
./flApp -b 1000 -1 10 -2 20 -- dataFile.txt
You will need to add a loop to handle multiple trailing filenames, and
Yes! I know that 1 and 2 are not the best choice for short opt names :-P
Cheers
D.
// this won't compile because there's lots of stuff omitted
/*
* global flags and option strings!
*/
int helpFlag = 0;
int debugFlag = 0;
const char* optionNodes1 = 0;
const char* optionNodes2 = 0;
const char* optionNbase = 0;
const char* optionMinMax = 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("-d", argv[i]) == 0 || strcmp("--debug", argv[i]) == 0) {
debugFlag = 1;
i += 1;
return 1;
}
if (strcmp("-1", argv[i]) == 0 || strcmp("--nodes1", argv[i]) == 0) {
if (i < argc-1 && argv[i+1] != 0) {
optionNodes1 = argv[i+1];
i += 2;
return 2;
}
}
if (strcmp("-2", argv[i]) == 0 || strcmp("--nodes2", argv[i]) == 0) {
if (i < argc-1 && argv[i+1] != 0) {
optionNodes2 = argv[i+1];
i += 2;
return 2;
}
}
if (strcmp("-b", argv[i]) == 0 || strcmp("--nbase", argv[i]) == 0) {
if (i < argc-1 && argv[i+1] != 0) {
optionNbase = argv[i+1];
i += 2;
return 2;
}
}
if (strcmp("-m", argv[i]) == 0 || strcmp("--minmax", argv[i]) == 0) {
if (i < argc-1 && argv[i+1] != 0) {
optionMinMax = argv[i+1];
i += 2;
return 2;
}
}
return 0;
}
int extractInt(const char* text)
{
int n, bytes = 0, value = 0;
n = sscanf(text, "%d%n", &value, &bytes);
assert(n == 1 && bytes == strlen(text));
return value;
}
double extractDbl(const char* text)
{
int n, bytes = 0;
double value = 0.0;
n = sscanf(text, "%lf%n", &value, &bytes);
assert(n == 1 && bytes == strlen(text));
return value;
}
int main(int argc, char* argv[])
{
int i = 1;
if (Fl::args(argc, argv, i, arg) < argc && strcmp("--", argv[i]) != 0)
Fl::fatal( "error: unknown option: %s\n"
"usage: %s [options] -- fileName.dat\n"
" -h | --help : print extended help message\n"
" -1 | --nodes1 # : horizontal elements [default=%d]\n"
" -2 | --nodes2 # : vertical elements [default=%d]\n"
" -b | --nbase # : base node number [default=%d]\n"
" plus standard fltk options\n",
argv[i], argv[0],
Box::def_nodes1, Box::def_nodes2, Box::def_nbase);
if (helpFlag)
Fl::fatal( "usage: %s [options] -- fileName.dat\n"
" -h | --help : print extended help message\n"
" -1 | --nodes1 # : horizontal elements [default=%d]\n"
" -2 | --nodes2 # : vertical elements [default=%d]\n"
" -b | --nbase # : base node number [default=%d]\n"
" plus standard fltk options:\n"
"%s\n",
argv[0],
Box::def_nodes1, Box::def_nodes2, Box::def_nbase,
Fl::help);
Fl_Window* w = new Fl_Window(400, 430);
Box* b = new Box(5, 5, 390, 390);
LightButtons* lbs = new LightButtons(0, 400, 400, 30);
lbs->bx = b;
w->end();
b->debug = debugFlag;
if (optionNodes1 != 0)
b->nodes1 = extractInt(optionNodes1);
if (optionNodes2 != 0)
b->nodes2 = extractInt(optionNodes2);
if (optionNbase != 0)
b->nbase = extractInt(optionNbase);
if (optionMinMax != 0) {
MinMaxReader mmr;
mmr.readFile(optionMinMax);
}
if (argc > 1)
b->readFile(argv[argc-1]);
w->show(argc, argv);
Fl::run();
return(0);
}
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