mirror of https://github.com/fltk/fltk
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
//
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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 2010 Greg Ercolano.
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// Copyright 1998-2021 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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#include <stdio.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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#ifdef _WIN32
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# define PING_CMD "ping -n 10 localhost" // 'slow command' under windows
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# ifdef _MSC_VER
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# define popen _popen
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# define pclose _pclose
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# define fileno _fileno
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# else /*_MSC_VER*/
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# include <unistd.h> // non-MS win32 compilers (untested)
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# endif /*_MSC_VER*/
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#else
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# include <unistd.h>
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# define PING_CMD "ping -i 2 -c 10 localhost" // 'slow command' under unix
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#endif
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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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// Note: FL_SOCKET as 1st argument is used to fix a compiler error(!) on Windows 64-bit.
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// Unfortunately we need this in FLTK 1.3 - should hopefully be fixed in 1.4 with a better solution.
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void HandleFD(FL_SOCKET 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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