2011/4/8 Yi Hui Fan <yihuifan@xxxxxxxxxx>:
> Jose,
>
>
>> Jose Antonio Santos Cadenas <santoscadenas@xxxxxxxxx>
>> Sent by: linux-bluetooth-owner@xxxxxxxxxxxxxxx
>>
>> 2011-04-08 15:04
>>
>> To
>>
>> Yi Hui Fan/China/IBM@IBMCN
>>
>> cc
>>
>> linux-bluetooth@xxxxxxxxxxxxxxx
>>
>> Subject
>>
>> Re: HDP, can't read data from fd which Acquire from HealthChannel
>>
>> Hi,
>>
>> 2011/4/8 Yi Hui Fan <yihuifan@xxxxxxxxxx>:
>> > Dears
>> >
>> > I'd like to build a demo for HDP sink. I try to use the DBUS API
> provided
>> > by Bluez. But there is a problem with unix fd to receive data.
>> >
>> > I can get fd by calling HealthChannel.Acquire method. following is
> the
>> > code I write to read data according the sock I got.
>> >
>> > fd_set rfds;
>> > struct timeval tv;
>> > int rv;
>> > char buff[1024];
>> >
>> > FD_ZERO(&rfds);
>> > FD_SET(sock, &rfds);
>> > tv.tv_sec = 10;
>> > tv.tv_usec = 500;
>> >
>> > rv = select(sock+1, &rfds, NULL, NULL, &tv);
>> >
>> > rv = recv(sock, buff, 1024, 0);
>> >
>> > rv is always return 0 when I call select method. I can't get anything.
>> >
>> > Any problem with these codes?
>>
>> It seems that you don't have a valid file descriptor. How are you
>> getting the file descriptor? Are you using Dbus 1.4?
>>
>
> Yes, I am using Dbus 1.4.
> I got the file descriptor by calling Acquire method of HealthChannel. Here
> is the code I wrote to get file descriptor.
>
> DBusConnection* conn;
> DBusError err;
> DBusMessage* msg;
> DBusMessage* reply;
> DBusMessageIter *iter;
>
> int sock;
>
> dbus_error_init(&err);
> printf("start get dbus connection\n");
> conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
> if (dbus_error_is_set(&err)) {
> fprintf(stderr, "Connection Error (%s)\n", err.message);
> dbus_error_free(&err);
> return -1;
> }
>
> if((msg = dbus_message_new_method_call("org.bluez", channel_path,
> "org.bluez.HealthChannel",
> "Acquire"))==NULL)
> {
> dbus_message_unref(msg);
> printf("initial msg failed!");
> return -1;
> }
>
> reply = dbus_connection_send_with_reply_and_block(conn, msg, -1,
> &err);
>
> dbus_message_get_args(reply, &err, DBUS_TYPE_UNIX_FD, &sock,
> DBUS_TYPE_INVALID);
The err variable should be initialized each time you use it and you
should also check the ret value of the previous function if fail, err
will contain a description.
You can also use dbus_error_is_set(&err) in order to check for errors.
>
> dbus_message_unref(msg);
> dbus_message_unref(reply);
> dbus_connection_unref(conn);
>
> return sock;
>
>>
>> >
>> > Thanks &
>> > Best regards,
>>
>> Regards
>>
>> Jose.
>>
>> >
>> > Yihui,Fan
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>
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