Re: Many questions
Am Sat, 05 Mar 2011 01:58:06 -0500 schrieb Jacques Pelletier jpellet...@ieee.org: Hi everybody, good morning, I have several questions: 1) How do we use the GThreadedSocketService and how do we specify the function to run when the connection is established? I'm using these function in a GUI application (see protocoltool on sourceforge); when the connection is made/closed, the GUI's controls are enabled/disabled. 2) Can an application load a linux kernel module? For example, my application may need i2c drivers. Does glib/gtk/gnome have anything to load kernel modules? How can it be done? yes they can. The program modprobe does this. I just did a strace of modprobe when it load a module and discovered init_module manpage: http://linux.die.net/man/2/init_module Perhaps you read the source code of modprobe for more details. 3) Now, for unrelated questions, what are the hook functions used for? They look interesting, but being an amateur programmer, I have no idea of the context where they may be used. Are they useful in an user application? They are a sort of callback functions. A nice example are gtk_about_dialog_set_email_hook gtk_about_dialog_set_url_hook The hook functions get called called when the user press the email or url link in the about dialog. Then in the hook function you can open another program e.g. browser or emailclient. hth Alex 4) How do we properly use the g_cancellable functions and when are these used? Are they useful in an user application? Thanks! JP Note: please reply to this mailing list for convenience of other users. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list -- Alexander Nagel E-mail: alexan...@acwn.de Homepage: http://www.acwn.de/ http://www.standspur-kadaver.de/ ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Many questions
Hi everybody, I have several questions: 1) How do we use the GThreadedSocketService and how do we specify the function to run when the connection is established? I'm using these function in a GUI application (see protocoltool on sourceforge); when the connection is made/closed, the GUI's controls are enabled/disabled. 2) Can an application load a linux kernel module? For example, my application may need i2c drivers. Does glib/gtk/gnome have anything to load kernel modules? How can it be done? 3) Now, for unrelated questions, what are the hook functions used for? They look interesting, but being an amateur programmer, I have no idea of the context where they may be used. Are they useful in an user application? 4) How do we properly use the g_cancellable functions and when are these used? Are they useful in an user application? Thanks! JP Note: please reply to this mailing list for convenience of other users. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Many questions when I drew a line
/***
I'm new to GTK+, please help me with following simple questions.
Thanks for your patience.
I wrote a simple programme to draw a line, the whole file is below
these questions:
1. I use gtk_widget_set_size_request() to resize the drawing_area,
but it's useless. The size of the drawing_area will resize to it's
parent's size automatically.How to make it's size fixed?
2. The bg_color I set in redraw() is useless too. Each time I run the
application,
the background color is different. Looks like random color.
3. Where can find introduction of GrStyle? It's too simple in GTK+ Manual Page.
4. How to set the line color and line width?
5. How to use color? The common RGB color is like (255, 255, 255),
but in GTK+ this can be (0x, 0x, 0x).
I was confused, how to set a right RGB color? Is there a bunch of build in
color I can use?
***/
#include gtk/gtk.h
gboolean redraw(GtkWidget *widget, GdkEvent *event, gpointer data)
{
GdkGC *gc = gdk_gc_new(widget-window);
GdkColor bg_color;
// Draw background
bg_color.red = 0x;
bg_color.green = 0;
bg_color.blue = 0;
gdk_gc_set_foreground(gc, bg_color);
gdk_draw_rectangle(widget-window, gc, TRUE,
0, 0, widget-allocation.width,
widget-allocation.height);
gdk_draw_line(widget-window,
widget-style-fg_gc[GTK_WIDGET_STATE(widget)],
0, 0, 120, 100);
return TRUE;
}
int main(int argc, char *argv[])
{
GtkWidget *w;
GtkWidget *drawing_area;
gtk_init(argc, argv);
w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(w), 300, 200);
g_signal_connect(GTK_OBJECT(w), destroy, G_CALLBACK(gtk_main_quit),
NULL);
drawing_area = gtk_drawing_area_new();
gtk_widget_set_size_request(GTK_WIDGET(drawing_area), 100, 100);
g_signal_connect(G_OBJECT(drawing_area), expose-event,
G_CALLBACK(redraw), NULL);
gtk_container_add(GTK_CONTAINER(w), drawing_area);
gtk_widget_show_all(w);
gtk_main();
return 0;
}
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