Re: Unexpected Warning with g_object_new with boolean Properties

[Stefan Kost <kost imn htwk-leipzig de>]

Hi Matt,

you dont need to supply a gvalue, doing just

o = g_object_new( test_get_type(), "test", TRUE, NULL );

will work.

Stefan

Matt Sanchez wrote:
> When I call g_object_new and pass a boolean property as name,GValue *, I
> get the following warning: GLib-GObject-WARNING **: value "TRUE" of type
> `gboolean' is invalid or out of range for property `test' of type
> `gboolean'.
>
> Using the attached test code, I traced the problem to the
> G_VALUE_COLLECT macro, which I have no real desire to fuss with. Is this
> a real problem, or am I just missing the obvious?
>
> I've tried this with glib-2.4.1, 2.4.6 and 2.4.8, on linux, all with the
> same results.
>
> Thanks,
> Matt
> -------------------------------------------------------------------------
> /*
> * test.c
> */
> #include <glib-object.h>
>
> #define TYPE_TEST (test_get_type())
> #define TEST(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), TYPE_TEST, Test))
>
> typedef struct _Test           Test;
> typedef struct _TestClass      TestClass;
>
> GType test_get_type( void );
>
> struct _Test
> {
>    GObject         parent;
>    gboolean        boolvalue;
> };
>
> struct _TestClass
> {
>    GObjectClass    parent;
> };
>
> static void
> test_set_property( GObject * object, guint prop_id, const GValue * value,
>    GParamSpec * pspec )
> {
>    Test * test = TEST( object );
>
>    switch( prop_id )
>    {
>    case 1:
>         test->boolvalue = g_value_get_boolean( value );
>        break;
>    default:
>        break;
>    }
> }
>
> static void
> test_get_property( GObject * object, guint prop_id, GValue * value,
> GParamSpec * pspec )
> {
>    Test * test = TEST( object );
>
>    switch( prop_id )
>    {
>    case 1:
>        g_value_set_boolean( value, test->boolvalue );
>        break;
>    default:
>        break;
>    }
> }
>
> static void
> test_class_init( gpointer klass, gpointer data )
> {
>    GObjectClass *  gobject_class;
>    gobject_class = G_OBJECT_CLASS( klass );
>    gobject_class->set_property = test_set_property;
>    gobject_class->get_property = test_get_property;
>
>    g_object_class_install_property( gobject_class, 1,
>        g_param_spec_boolean( "test", "Test",
>            "Boolean property test", TRUE,
>            G_PARAM_READWRITE ) );
> }
>
> static void
> test_instance_init( GTypeInstance * instance, gpointer klass )
> {
>    Test *   o = TEST( instance );
>    o->boolvalue = FALSE;
> }
>
> GType
> test_get_type( void )
> {
>    static GType    test_type = 0;
>    if ( 0 == test_type )
>    {
>        static const GTypeInfo test_info =
>        {
>            sizeof( TestClass ),  // class size
>            NULL,                 // base_init
>            NULL,                 // base_finalize
>            test_class_init,      // class_init
>            NULL,                 // class_finalize
>            NULL,                 // class_data
>            sizeof( Test ),       // instance size
>            0,                    // n_preallocs
>            test_instance_init,   // instance_init
>        };
>        test_type = g_type_register_static( G_TYPE_OBJECT,
>            "Test", & test_info, 0 );
>    }
>    return test_type;
> }
>
> int main( int argc, char * argv[] )
> {
>    GValue      v = { 0, };
>    GObject *   o;
>
>    g_type_init();
>    g_value_init( & v, G_TYPE_BOOLEAN );
>    g_value_set_boolean( & v, FALSE );
>
>    o = g_object_new( test_get_type(), "test", & v, NULL );
>    if ( o )
>        g_object_unref( o );
>
>    return 0;
> }
> -------------------------------------------------------------------------
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-- 
      \|/            Stefan Kost
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