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FLTK - Fast Light Tool Kit - https://github.com/fltk/fltk - cross platform GUI development
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72 lines
2.4 KiB
72 lines
2.4 KiB
// |
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// "$Id$" |
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// |
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// How to use popen() and Fl::add_fd() - erco 10/04/04 |
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// Originally from erco's cheat sheet, permission by author. |
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// |
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// Shows how the interface can remain "alive" while external |
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// command is running and outputing occassional data. For instance, |
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// while the command is running, keyboard navigation works, |
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// text can be highlighted, and the interface can be resized. |
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// |
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// Copyright 1998-2010 by Bill Spitzak and others. |
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// |
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// This library is free software; you can redistribute it and/or |
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// modify it under the terms of the GNU Library General Public |
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// License as published by the Free Software Foundation; either |
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// version 2 of the License, or (at your option) any later version. |
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// |
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// This library is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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// Library General Public License for more details. |
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// |
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// You should have received a copy of the GNU Library General Public |
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// License along with this library; if not, write to the Free Software |
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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// USA. |
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// |
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// Please report all bugs and problems on the following page: |
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// |
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// http://www.fltk.org/str.php |
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// |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <FL/Fl.H> |
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#include <FL/Fl_Window.H> |
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#include <FL/Fl_Multi_Browser.H> |
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#define PING_CMD "ping -i 2 -c 10 localhost" // 'slow command' under unix |
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// GLOBALS |
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FILE *G_fp = NULL; |
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// Handler for add_fd() -- called whenever the ping command outputs a new line of data |
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void HandleFD(int fd, void *data) { |
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Fl_Multi_Browser *brow = (Fl_Multi_Browser*)data; |
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char s[1024]; |
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if ( fgets(s, 1023, G_fp) == NULL ) { // read the line of data |
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Fl::remove_fd(fileno(G_fp)); // command ended? disconnect callback |
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pclose(G_fp); // close the descriptor |
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brow->add(""); brow->add("<<DONE>>"); // append msg indicating command finished |
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return; |
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} |
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brow->add(s); // line of data read? append to widget |
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} |
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int main(int argc, char *argv[]) { |
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Fl_Window win(600,600); |
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Fl_Multi_Browser brow(10,10,580,580); |
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if ( ( G_fp = popen(PING_CMD, "r") ) == NULL ) { // start the external unix command |
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perror("popen failed"); |
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return(1); |
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} |
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Fl::add_fd(fileno(G_fp), HandleFD, (void*)&brow); // setup a callback for the popen()ed descriptor |
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win.resizable(brow); |
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win.show(argc, argv); |
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return(Fl::run()); |
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} |
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// |
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// End of "$Id$". |
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//
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