Re: Warnings/Errors during Threaded Execution

["Christopher Bland" <themanatuf juno com>]

Brian J. Tarricone wrote:

>> Clicking the first button fires the 'clicked' event where I make the
>> following calls:
>> 
>> g_thread_init(NULL);
>> gdk_threads_init();

>Looks like you didn't read the docs well enough then.  Those two calls
>*must* come *before* your gtk_init() call.  Then, as another poster
>suggested, you need to surround the call to gtk_main() like so:

Right on... I did miss that part. I'm obviously new to GTK but not to
threading and I'm having a hard time wrapping my brain around this for
some reason.

I cleared up the warning messages, however I am still hung up; I've
pasted a sample below. When I click the 'Start' button it freezes and
I'm not using threads, although I think it should be set up to run
them. I'm unfortunately the only developer in my shop so I can't get
another pair of eyes to look at this and I've been driving myself crazy
all day. Any suggestions would be appreciated.


[code]
#include <stdio.h>
#include <gtk/gtk.h>


GtkWidget *statusbar;
static guint context_id;

int setStatus (char*, char*);


static void beginScan (GtkWidget *widget, gpointer data)
{
	printf("Hello World!\n");
	setStatus("0.0", "Working...");
}


/* Callback function to set the progress bar from other functions */
int setStatus (char *fraction, char *text)
{
	
	gdk_threads_enter();
	gtk_statusbar_push(GTK_STATUSBAR(statusbar), context_id, text);
	while (g_main_context_iteration(NULL, FALSE));
	gdk_threads_leave();
		
	return 0;
}


/* Callback to do some cleanup if a delete_event is called */
static gboolean delete_event (GtkWidget *widget, GdkEvent *event,
gpointer data )
{
    /* TODO: Need to put some cleanup stuff here... */
    return FALSE;
}


/* Callback to destroy the window and all of its widgets */
static void destroy (GtkWidget *widget, gpointer data)
{
    gtk_main_quit ();
}


int main(int argc, char *argv[])
{
	GtkWidget *window, *button1;
	GtkWidget *vbox1, *info_frame;
	
    g_thread_init(NULL);
    gdk_threads_init();
    
    gtk_init (&argc, &argv);
    
    /* create a new window */
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "Aurora Hard Drive
Forensics");
	gtk_window_set_default_size(GTK_WINDOW(window), 200, 125);
	gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER_ALWAYS);
	gtk_container_set_border_width (GTK_CONTAINER(window), 3);
    
    g_signal_connect (G_OBJECT(window), "delete_event",
G_CALLBACK(delete_event), NULL);
    g_signal_connect (G_OBJECT(window), "destroy", G_CALLBACK(destroy),
NULL);
    
    /* Create the vertical packing box and the two frames */
    vbox1 = gtk_vbox_new(FALSE, 0);
    info_frame = gtk_frame_new("Information");
    
    button1 = gtk_button_new_with_label("Start Scan");
    g_signal_connect(G_OBJECT(button1), "clicked",
G_CALLBACK(beginScan), NULL);
    gtk_container_add(GTK_CONTAINER(info_frame), button1);
    
    /* Create the status bar */
    statusbar = gtk_statusbar_new();
    gtk_statusbar_set_has_resize_grip(GTK_STATUSBAR(statusbar), FALSE);
    context_id = gtk_statusbar_get_context_id(GTK_STATUSBAR(statusbar),
"Statusbar");
    gtk_statusbar_push(GTK_STATUSBAR(statusbar), context_id, "Idle");
    
   
/*************************************************************************/
    /* Start packing the boxes and frames into the window */
    gtk_box_pack_start(GTK_BOX(vbox1), info_frame, TRUE, TRUE, 0);
    gtk_box_pack_start(GTK_BOX(vbox1), statusbar, FALSE, TRUE, 0);
    gtk_container_add(GTK_CONTAINER(window), vbox1);
    
   
/*************************************************************************/
    /* The final step is to display this newly created widget. */
    gtk_widget_show_all(window);
    gtk_widget_show(window);
    
    gdk_threads_enter();
    gtk_main();
    gdk_threads_leave();
    
    return 0;
}
[/code]

c++ `pkg-config --cflags --libs gtk+-2.0 gthread-2.0` gtk_thread_test.c


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