Sending an array of bytes (type `ay`) via D-Bus using GDBus

Question

I am trying to use an array of bytes via D-Bus using GDBus bindings. Could you tell me how I can achieve this. I tried google search but didn't help.

The byte array contains the image file, so it cannot be converted to charbytearray

Any help is determined

Answer 1

, . .

Answer 2

XML, ay. QT ( qdbusxml2cpp), QByteArray, , glib ( gdbus-codegen), gchar *, , , \0 - - . , :

org.gtk.GDBus.C.ForceGVariant - , GVariant C. bytestrings (type-string ay) , NUL.

https://developer.gnome.org/gio/stable/gdbus-codegen.html, GVariant. , org.gtk.GDBus.C.ForceGVariant <annotation name="org.gtk.GDBus.C.ForceGVariant" value="true"/> , .

Answer 3

, "ay" "a (y)". glib "a (y)" GVariant *.

"GVariant" .

. xml

<method name="parsePacket">
  <arg direction="in" name="message" type="a(y)">
    <doc>
      <line>type: const Uint8 *</line>
    </doc>
  </arg>
</method>

:

gboolean (*handle_parse_packet) (
IDbusObject *object, GDBusMethodInvocation *invocation, GVariant *arg_message);

gboolean idbusobject_call_parse_packet_sync (
   IDbusObject *proxy,
   GVariant *arg_message,
   GCancellable *cancellable,
  GError **error);

"GVariant".

:

void parsePacket (unsigned char* arg_message, guint16 arg_length)
{
    GVariantBuilder *builder;
    GVariant *value;

    builder = g_variant_builder_new (G_VARIANT_TYPE ("a(y)"));
    for (int i = 0; i < arg_length; i++)
    {
        g_variant_builder_add (builder, "(y)", arg_message[i]);
    }
    value = g_variant_new ("a(y)", builder);
    g_variant_builder_unref (builder);

    idbusobject_call_parse_packet_sync(proxy,
        value,
        NULL,
        NULL);
}

:

gboolean handleParsePacket (
    IDbusObject *object,
    GDBusMethodInvocation *invocation,
    GVariant *arg_message)
{
    unsigned char byteArray[2048];
    int actualLength = 0;

    GVariantIter *iter;
    guchar str;

    g_variant_get (arg_message, "a(y)", &iter);
    while (g_variant_iter_loop (iter, "(y)", &str))
    {
        byteArray[actualLength++] = str;
    }
    g_variant_iter_free (iter);

    idbusobject_complete_parse_packet( object, invocation);

    return (TRUE);
}

Answer 4

, g_variant_new_from_data():

GVariant* convertByteArrayToVariant(unsigned char* arg_message, guint16 arg_length)
{
    return g_variant_new_from_data(
        G_VARIANT_TYPE ("a(y)"),
        arg_message,
        arg_length,
        TRUE,
        NULL,
        NULL);
}

, GByteArray *, :

GVariant* convertByteArrayToVariant(GByteArray* array)
{
    return g_variant_new_from_data(
        G_VARIANT_TYPE ("a(y)"),
        array->data,
        array->len,
        TRUE,
        NULL,
        NULL);
}