Error: HAL context initializing failure

[Pallavi_K]

Please can anybody tell me why am I getting this error in foll code?
Do I need to start hal first and if yes how do i need to do that.
Your help is appreciated


Code:

DBusConnection *connection;
DBusError error;
LibHalContext *ctx;
dbus_error_init(&error);
if((connection = dbus_bus_get(DBUS_BUS_SYSTEM,&error)) == NULL)
{
printf("Error %s\n",error.message);
return 1;
}
if ( dbus_error_is_set(&error) )
{
printf("Unable to connect to DBus: %s\n",error.message);
return 1;
}
if((ctx = libhal_ctx_new())==NULL)
{
printf("Error %s\n",error.message);
return 1;
}
if ( !libhal_ctx_set_dbus_connection(ctx, connection) )
{
printf("Error %s\n",error.message);
return 1;
}
if ( !libhal_ctx_init(ctx, &error) )
{
printf("Hal context initializing failure %s\n",error.message);
return 1;
}

[divanov]

This is an example how you do it

    DBusError error;
    DBusConnection *conn;

    LibHalContext *ctx = libhal_ctx_new();

    dbus_error_init(&error);
    conn = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
    if (!conn) {
        g_critical("%s", error.message);
        dbus_error_free(&error);
    }

    dbus_connection_setup_with_g_main(conn, NULL);
    if (!libhal_ctx_set_dbus_connection(ctx, conn))
        g_critical("Cannot init HAL context with DBus");

    if (!libhal_ctx_init(ctx, &error)) {
        g_critical("%s", error.message);
        dbus_error_free(&error);
    }

[Pallavi_K]

Hi divanov,
Thanks for the reply. I tried using ur code too. But still i get the same error as "Hal failed to initialize" in the below lines of code:
(!libhal_ctx_init(ctx, &error)) {..}
When i debug the code it says : Cannot access memory at address 0x0

Pls can u help me any further?

[divanov]

Hi divanov,
Thanks for the reply. I tried using ur code too. But still i get the same error as "Hal failed to initialize" in the below lines of code:
(!libhal_ctx_init(ctx, &error)) {..}
When i debug the code it says : Cannot access memory at address 0x0

This is rather weird and I start to suspect that problem is not in the code.
Try this sample application, which is working for sure
http://wiki.forum.nokia.com/index.ph...atus_using_HAL

[Pallavi_K]

Hi Divanov,
Actually i am coding in Maemo, but APIs are the same and method is also the same.
I had a look at the link u fwd to me. Previously i had coded taking help from that link only. But still error is not going.
For ur reference I am attaching the source code here. Please do have a look at the code:



int main( int argc, char* argv[] )
{
/* Create needed variables */
HildonProgram *program;
HildonWindow *window;
GtkWidget *button;
osso_context_t *osso_cont;
osso_return_t ret;

locale_init();

osso_cont = osso_initialize(APP_NAME, APP_VER, TRUE, NULL);
if (osso_cont == NULL)
{
fprintf (stderr, "osso_initialize failed.\n");
exit (1);
}

/* Initialize the GTK. */
gtk_init( &argc, &argv );

/* Create the hildon program and setup the title */
program = HILDON_PROGRAM(hildon_program_get_instance());
g_set_application_name("Hello World");

/* Create HildonWindow and set it to HildonProgram */
window = HILDON_WINDOW(hildon_window_new());
hildon_program_add_window(program, window);

/* Quit program when window is closed. */
g_signal_connect (G_OBJECT (window), "delete_event",
G_CALLBACK (gtk_main_quit), NULL);

/* Quit program when window is otherwise destroyed. */
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (gtk_main_quit), NULL);

/* Create button and add it to main view */
button = gtk_button_new_with_label(_("Hello World!!!"));
gtk_container_add(GTK_CONTAINER(window),
button);

g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (button_clicked), NULL);

ret = osso_rpc_set_cb_f (osso_cont,
APP_SERVICE,
APP_METHOD,
APP_SERVICE,
dbus_callback, GTK_WIDGET( window ));
if (ret != OSSO_OK) {
fprintf (stderr, "osso_rpc_set_cb_f failed: %d.\n", ret);
exit (1);
}

int getn = mem_info();

/* Begin the main application */
gtk_widget_show_all ( GTK_WIDGET ( window ) );
gtk_main();

/* Exit */
return 0;
}


int mem_info()
{
DBusError error;
DBusConnection *connection;

LibHalContext *ctx = libhal_ctx_new();
const char *udi = "/sdrom";

dbus_error_init(&error);

connection = dbus_bus_get(DBUS_BUS_SYSTEM,&error);
if(!connection)
{
printf("Error %s\n",error.message);
dbus_error_free(&error);
return 1;
}

if ( dbus_error_is_set(&error) )
{
printf("Unable to connect to DBus: %s\n",error.message);
dbus_error_free(&error);
return 1;
}

//set dbus connection to talk to hald
if ( !libhal_ctx_set_dbus_connection(ctx, connection) )
{
printf("Error %s\n",error.message);
dbus_error_free(&error);
return 1;
}

//Initialize connection to hald
if ( !libhal_ctx_init(ctx, &error) )
{
printf("Hal context initializing failure %s\n",error.message);
dbus_error_free(&error);
return 1;
}
else
{
printf("Successful");
return 0;
}
}

Thanks & Regards.

[divanov]

Actually i am coding in Maemo, but APIs are the same and method is also the same.

It seems you are using Gtk2, and example is using Qt, however, this is irrelevant to using HAL.

I had a look at the link u fwd to me. Previously i had coded taking help from that link only. But still error is not going.
For ur reference I am attaching the source code here. Please do have a look at the code:

Can you create a folder example, copy the example to main.cpp, run

qmake -project

than add

unix {
    CONFIG += link_pkgconfig
    PKGCONFIG += hal
}

to the example.pro
run

qmake
make

and then try to execute resulting binary and report here if it works or not?

[divanov]

I've modified your application to make it compile

/* gcc hal.c -o hal -Wall $(pkg-config --cflags --libs gtk+-2.0 hildon-1 hal hal-storage dbus-glib-1 libosso) */

#include <gtk/gtk.h>
#include <glib.h>
#include <stdlib.h>
#include <hildon/hildon.h>
#include <libhal.h>
#include <libosso.h>
#include <libhal-storage.h>
#include <dbus/dbus-glib-lowlevel.h>

int main( int argc, char* argv[] )
{
  /* Create needed variables */
  HildonProgram *program;
  HildonWindow *window;
  GtkWidget *button;
  osso_context_t *osso_cont;
  osso_return_t ret;

  /*
  locale_init();
  */

  osso_cont = osso_initialize("APP_NAME", "1.0", TRUE, NULL);
  if (osso_cont == NULL)
  {
    fprintf (stderr, "osso_initialize failed.\n");
   exit (1);
  }

  /* Initialize the GTK. */
  gtk_init( &argc, &argv );

  /* Create the hildon program and setup the title */
  program = HILDON_PROGRAM(hildon_program_get_instance());
  g_set_application_name("Hello World");

  /* Create HildonWindow and set it to HildonProgram */
  window = HILDON_WINDOW(hildon_window_new());
  hildon_program_add_window(program, window);

  /* Quit program when window is closed. */
  g_signal_connect (G_OBJECT (window), "delete_event",
  G_CALLBACK (gtk_main_quit), NULL);

  /* Quit program when window is otherwise destroyed. */
  g_signal_connect (G_OBJECT (window), "destroy",
  G_CALLBACK (gtk_main_quit), NULL);

  /* Create button and add it to main view */
  button = gtk_button_new_with_label("Hello World!!!");
  gtk_container_add(GTK_CONTAINER(window),
  button);

  /*
  g_signal_connect (G_OBJECT (button), "clicked",
  G_CALLBACK (button_clicked), NULL);

  ret = osso_rpc_set_cb_f (osso_cont,
  APP_SERVICE,
  APP_METHOD,
  APP_SERVICE,
  dbus_callback, GTK_WIDGET( window ));
  if (ret != OSSO_OK) {
  fprintf (stderr, "osso_rpc_set_cb_f failed: %d.\n", ret);
  exit (1);
  }
  */

  int getn = mem_info();

  /* Begin the main application */
  gtk_widget_show_all ( GTK_WIDGET ( window ) );
  gtk_main();

  /* Exit */
  return 0;
}


int mem_info()
{
DBusError error;
DBusConnection *connection;

LibHalContext *ctx = libhal_ctx_new();
const char *udi = "/sdrom";

dbus_error_init(&error);

connection = dbus_bus_get(DBUS_BUS_SYSTEM,&error);
if(!connection)
{
printf("Error %s\n",error.message);
dbus_error_free(&error);
return 1;
}

if ( dbus_error_is_set(&error) )
{
printf("Unable to connect to DBus: %s\n",error.message);
dbus_error_free(&error);
return 1;
}

//set dbus connection to talk to hald
if ( !libhal_ctx_set_dbus_connection(ctx, connection) )
{
printf("Error %s\n",error.message);
dbus_error_free(&error);
return 1;
}

//Initialize connection to hald
if ( !libhal_ctx_init(ctx, &error) )
{
printf("Hal context initializing failure %s\n",error.message);
dbus_error_free(&error);
return 1;
}
else
{
printf("Successful\n");
return 0;
}
}

And this is output when I run it on N900:

~ $ ./hal 
Successful

Ok, you were running the app in scratchbox, where HAL is not supported.

[Pallavi_K]

Hi Divanov,
Thanks for your continuous support.

[Pallavi_K]

Hi Divanov,
I tried running the above code from Linux Desktop.
It gives foll errors:

pallavi@pallavi-desktop:~$ gcc -ggdb `pkg-config --cflags hal dbus-1` try.c -o hal `pkg-config --libs hal dbus-1`
Package hal was not found in the pkg-config search path.
Perhaps you should add the directory containing `hal.pc'
to the PKG_CONFIG_PATH environment variable
No package 'hal' found
Package dbus-1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `dbus-1.pc'
to the PKG_CONFIG_PATH environment variable
No package 'dbus-1' found
Package hal was not found in the pkg-config search path.
Perhaps you should add the directory containing `hal.pc'
to the PKG_CONFIG_PATH environment variable
No package 'hal' found
Package dbus-1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `dbus-1.pc'
to the PKG_CONFIG_PATH environment variable
No package 'dbus-1' found
/usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crt1.o: In function `_start':
/build/buildd/eglibc-2.10.1/csu/../sysdeps/i386/elf/start.S:115: undefined reference to `main'
collect2: ld returned 1 exit status
pallavi@pallavi-desktop:~$


Pls tell me how do i solve this error?

[divanov]

Hi Divanov,
I tried running the above code from Linux Desktop.
It gives foll errors:

pallavi@pallavi-desktop:~$ gcc -ggdb `pkg-config --cflags hal dbus-1` try.c -o hal `pkg-config --libs hal dbus-1`
Package hal was not found in the pkg-config search path.
Perhaps you should add the directory containing `hal.pc'
to the PKG_CONFIG_PATH environment variable
No package 'hal' found
Package dbus-1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `dbus-1.pc'
to the PKG_CONFIG_PATH environment variable
No package 'dbus-1' found
Package hal was not found in the pkg-config search path.
Perhaps you should add the directory containing `hal.pc'
to the PKG_CONFIG_PATH environment variable
No package 'hal' found
Package dbus-1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `dbus-1.pc'
to the PKG_CONFIG_PATH environment variable
No package 'dbus-1' found
/usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crt1.o: In function `_start':
/build/buildd/eglibc-2.10.1/csu/../sysdeps/i386/elf/start.S:115: undefined reference to `main'
collect2: ld returned 1 exit status
pallavi@pallavi-desktop:~$


Pls tell me how do i solve this error?

Please, install libhal-dev and libdbus-1-dev.

[Pallavi_K]

Thanks , it worked for me