C pointer principle (40)-GLIB

I. Brief Introduction and Configuration

GLib is a cross-platform library written in C language. It was initially part of GTK +, but in the second version of GTK +, developers decided to separate code unrelated to the graphic interface, the code is then assembled into GLib. Because GLib has the cross-platform feature, programs written with it can be compiled and run on other programs without significant modifications.

The glib library is the most common C language function library in Linux. It has good portability and practicability.

Glib is the basis of Gtk + Library and Gnome. Glib can be used on multiple platforms, such as Linux, Unix, and Windows. Glib provides substitutes for many standard and common C language structures.

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If the function in the glib library is to be used in the program, it should contain the glib. h header file (the gtk. h and gnome. h header files already contain glib. h)

1. Install glib in Freebsd

Cd/usr/ports/devel/glib20

Portsnap fetch extract

Looking up portsnap.FreeBSD.org mirrors... 7 mirrors found.

Fetching snapshot tag from isc.portsnap.freebsd.org... done.

Fetching snapshot metadata... done.

Updating from Fri Dec 6 11:20:31 CST 2013 to Mon Dec 23 21:23:19 CST 2013.

Fetching 4 metadata patches... done.

Applying metadata patches... done.

Fetching 4 metadata files... gunzip: (stdin): unexpected end of file

Metadata is upt.

Root @ dp:/usr/ports/devel/glib20 # ls

Makefile distinfo files pkg-descr pkg-plist

Root @ dp:/usr/ports/devel/glib20 # make install clean

==> License LGPL20 accepted by the user

==>Found saved configuration for glib-2.36.3

==> Fetching all distfiles required by glib-2.36.3 for building

==> Extracting for glib-2.36.3

=> SHA256 Checksum OK for gnome2/glib-2.36.3.tar.xz.

==> Patching for glib-2.36.3

==> Glib-2.36.3 depends on package: libtool> = 2.4-found

==> Applying FreeBSD patches for glib-2.36.3

..........................

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2. configuration and installation in windows

3. test:

Linux/unix testing, taking freebsd as an Example

First, let's take a look at the program below. In the editor, enter the following program. The program first creates 20 random numbers ranging from 1 to 30000000 and displays them on the screen. Then, it calculates the total number of times, and output the computing time.

# Include

Int main (int argc, char * argv [])

{

GRand * rand;

GTimer * timer;

Gint n;

Gint I, j;

Gint x = 0;

Rand = g_rand_new (); // creates a random number object.

For (n = 0; n <20; n ++)

{// Generate a random number and display it

G_print ("% d \ t", g_rand_int_range (rand, 1,100 ));

}

G_print ("\ n ");

G_rand_free (rand); // release the random number object.

// Create a timer

Timer = g_timer_new ();

G_timer_start (timer); // start timing

For (I = 0; I <10000; I ++)

For (j = 0; j <3000; j ++)

X ++; // accumulative

G_timer_stop (timer); // time end

// Output timing results

G_print ("% ld \ tall: %. 2f seconds was used! \ N ", x, g_timer_elapsed (timer, NULL ));

}

Compile

Dp @ dp :~ /Gliblearn % gcc 'pkg-config -- cflags -- libs glib-2.0 gthread-2.0 'a. c-o mytest

Last run:

Dp @ dp :~ /Gliblearn %./mytest

96 24 52 87 52 16 62 17 78 62 6 33 53 87 3 40 69 20 33

30000000 all: 0.08 seconds was used!

Dp @ dp :~ /Gliblearn %