03-21-2010
I know Gnome has a utility program, gnome-open, which will take the file you pass to it and open that with the default application, whatever that is - presumably there's something similar for KDE and other popular desktop environments?
If you want it to be fairly portable, you could:
1) Check for the presence of, e.g. gnome-open with system("gnome-open --version"), and so on for other programs until you find one,
2) If that doesn't work, go down a similar list of raw pdf viewers (system("evince --version"), etc), and
3) If you still can't find one, prompt the user for the name of a program.
Apart from that, I don't think there's a lot else you can do.
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LEARN ABOUT DEBIAN
gnome-control-center
gnome-control-center(1) User Commands gnome-control-center(1)
NAME
gnome-control-center, gnome-desktop-prefs - configure desktop preferences
SYNOPSIS
gnome-control-center [gnome-std-options] [--noshell]
DESCRIPTION
Desktop Preferences allows you to configure the GNOME desktop. If Nautilus is running, gnome-control-center will open up a new window and
display all your preference tools. If Nautilus is not running, gnome-control-center will display a simple interface allowing you to select
the preference tool to run. There are 3 categories of preference tools: Basic, Advanced, and Accessibility. Double-click on the tool that
you require and the dialog for the tool will be displayed.
OPTIONS
The following options are supported:
--noshell Do not display the Desktop Preferences in Nautilus. This is not a supported interface.
gnome-std-optionStandard options available for use with most GNOME applications. See gnome-std-options(5).
EXAMPLES
Example 1: Launching Desktop Preferences
example% gnome-control-center
EXIT STATUS
The following exit values are returned:
0 Application exited successfully
>0 Application exited with failure
FILES
The following files are used by this application:
/usr/bin/gnome-control-cExecutable for Desktop Preferences interface
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+------------------------------+
|Availability |SUNWgnome-desktop-preferences |
+-----------------------------+------------------------------+
|Interface stability |External |
+-----------------------------+------------------------------+
SEE ALSO
Preference Tools Manual
Latest version of the GNOME Desktop User Guide for your platform.
gnome-background-properties(1), gnome-font-properties(1), gnome-keyboard-properties(1), gnome-keybinding-properties(1), gnome-ui-proper-
ties(1), gnome-mouse-properties(1), gnome-network-preferences(1), gnome-sound-properties(1), gnome-theme-properties(1), metacity-proper-
ties(1), gnome-accessibility-keyboard-properties(1), cddb-slave2-properties(1), gnome-file-types-properties(1), gnome-panel-preferences(1),
gnome-default-applications-properties(1), gnome-session-properties(1), gnome-std-options(5)
NOTES
Written by Glynn Foster, Sun Microsystems Inc., 2003.
SunOS 5.10 2 Oct 2003 gnome-control-center(1)