xfdesktop trash troubles

[Brian J. Tarricone]

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Hey Benny (or anyone),

I'm trying to use dbus directly to handle the trash stuff in xfdesktop,
and I can't seem to get it to work properly.  I'm probably just doing
something wrong (and the dbus-glib docs are rather sparse), but can you
help?

With the following code, The 'QueryTrash' call works as expected, but
the 'DisplayTrash' call returns "No reply within specified time" in the
GError.

- From the cmdline, running:
dbus-send --print-reply --dest=org.xfce.FileManager \
    /org/xfce/FileManager org.xfce.Trash.DisplayTrash string:':0'
does indeed work as expected.

Any ideas?  I've tried setting display_name to "", ":0", and ":0.0" for
the hell of it; no luck.

	-brian

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/* compile with:
 * gcc -o dbus-test dbus-test.c `pkg-config glib-2.0 dbus-glib-1 \
       --cflags --libs`
 */

#include <glib.h>
#define DBUS_API_SUBJECT_TO_CHANGE
#include <dbus/dbus-glib.h>

int
main(int argc,
     char **argv)
{
    DBusGConnection *dgconn;
    DBusGProxy *dbus_proxy;
    gboolean ret, trash_full;
    GError *error = NULL;
    const gchar *display_name = g_getenv("DISPLAY");

    g_type_init();

    dgconn = dbus_g_bus_get(DBUS_BUS_SESSION, NULL);
    dbus_proxy = dbus_g_proxy_new_for_name(dgconn,
                                           "org.xfce.FileManager",
                                           "/org/xfce/FileManager",
                                           "org.xfce.Trash");

    /* this works */
    ret = dbus_g_proxy_call(dbus_proxy, "QueryTrash", &error,
                            G_TYPE_INVALID,
                            G_TYPE_BOOLEAN, &trash_full,
                            G_TYPE_INVALID);
    if(ret)
        g_print("Trash is %sfull\n", trash_full ? "" : "not ");
    else {
        g_printerr("QueryTrash failed: %s", error->message);
        error = NULL;
    }

    /* this does not */
    ret = dbus_g_proxy_call(dbus_proxy, "DisplayTrash", &error,
                            G_TYPE_STRING, &display_name,
                            G_TYPE_INVALID, G_TYPE_INVALID);

    if(!ret)
        g_printerr("DisplayTrash failed: %s\n", error->message);

    return 0;
}
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