5162d3bc8d
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7629 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
//
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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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