> Actually I have already spent so much time to configure progress bar of
> FLTK. but i couldn't manage it out.. I just want that when i open any
> file, by reading lines from the file, progress bar will show the
> percentage of completed lines.
>
> but when the file reading loop starts, Fl::check() make time interval i
> think so. progress bar is showing without any problem. but the speed of
> line reading is reduced 100 times may be. I don't know whats wrong with
> it. How can i make a real-time progress bar that works in real-time. real-
> time means if i print out something from a loop, progress bar should show
> the same percentage and timing as cout or printf shows.
I just tried this (demo attached, sorry it's so long) and I'm not seeing a big
performance hit - on this aged WinXP machine this rattles through a 300MB text
file in hardly any time at all; I'm not seeing a significant difference whether
I update the GUI or not...
----------
#include <stdio.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Progress.H>
#include <FL/Fl_Native_File_Chooser.H>
#include <FL/Fl_Button.H>
static Fl_Double_Window *main_win = NULL;
static Fl_Progress *prgbar = NULL;
static Fl_Native_File_Chooser *chooser_widget = NULL;
static Fl_Button *get_file_bt = NULL;
/*****************************************************************************/
static unsigned is_regular_file_read(const char *fn)
{
struct stat statbuf;
int res = stat(fn, &statbuf);
if(res < 0) return 0; // doesn't exist
if(S_ISDIR(statbuf.st_mode)) return 0; // it's a directory
if(S_ISREG(statbuf.st_mode))
{
int res = access(fn, R_OK);
if(res == 0) return statbuf.st_size;
}
return 0;
} // is_regular_file_read
/*****************************************************************************/
static void get_file(Fl_Button *, void *v)
{
char buffer[512];
/* Pop a file chooser to select the file to open */
if (!chooser_widget)
{
chooser_widget = new Fl_Native_File_Chooser();
}
chooser_widget->type(Fl_Native_File_Chooser::BROWSE_FILE);
// now show the file open dialog
int canceled = chooser_widget->show();
prgbar->label("Waiting...");
prgbar->value(0.0);
prgbar->redraw();
/* Get the selected filename */
if ((!canceled) && (chooser_widget->count() > 0))
{
unsigned sz = is_regular_file_read(chooser_widget->filename(0));
if(!sz) return;
FILE *fp = fopen(chooser_widget->filename(0), "rb");
if(!fp) return;
unsigned read = 0;
float last = 0.0;
float curr;
prgbar->label("Reading...");
while ((read < sz) && (!feof(fp)))
{
read += fread(buffer, 1, 512, fp);
curr = (float)read * 100.0 / (float)sz;
if((curr - last) > 3.0)
{
last = curr;
prgbar->value(last);
Fl::check();
}
}
fclose(fp);
prgbar->value(100.0);
prgbar->label("Done!");
prgbar->redraw();
}
} // get_file
/*****************************************************************************/
static void do_exit(Fl_Button *, void *v)
{
main_win->hide();
} // do_exit
/*****************************************************************************/
int main(int argc, char **argv)
{
main_win = new Fl_Double_Window(500, 400);
main_win->begin();
prgbar = new Fl_Progress(90, 110, 305, 55, "Waiting...");
prgbar->color((Fl_Color)5);
prgbar->selection_color((Fl_Color)1);
prgbar->minimum(0);
prgbar->maximum(100);
get_file_bt = new Fl_Button(90, 180, 60, 30, "Get...");
get_file_bt->callback((Fl_Callback *)get_file);
Fl_Button *exit_bt = new Fl_Button(430, 360, 60, 30, "EXIT");
exit_bt->callback((Fl_Callback *)do_exit);
main_win->end();
main_win->show(argc, argv);
return Fl::run();
}
/* end of file */
-------------
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