Mailing-List: contact users-help@qpid.apache.org; run by ezmlm
Precedence: bulk
Reply-To: users@qpid.apache.org
Received-SPF: pass (nike.apache.org: domain of zhihua.che@gmail.com designates
 209.85.210.50 as permitted sender)
MIME-Version: 1.0
In-Reply-To: 
 <d14124a4-1ad6-4a1a-bad2-947cc0aef640@zmail12.collab.prod.int.phx2.redhat.com>
References: 
 <CABexPfFDikBX7DtPZq0B31qau7GMDyj2Bc9_DMknJS776h5n9A@mail.gmail.com>
	<d14124a4-1ad6-4a1a-bad2-947cc0aef640@zmail12.collab.prod.int.phx2.redhat.com>
Date: Thu, 5 Apr 2012 10:39:48 +0800
Message-ID: 
 <CABexPfF5fTgiyJu2Jzji+eVCEeNfOpWhGna0ODJz85oC3wmEdg@mail.gmail.com>
Subject: Re: Is there compelte API reference and How serialize byte array like
 int array[n]
From: Zhihua Che <zhihua.che@gmail.com>
To: users@qpid.apache.org
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

Sorry, I'm late. First, thanks for your reply.

As far as portablity is concerned, I guess setContent(const char *,
size_t) is  not a suitable option.

If I choose Variant=EF=BC=8C that means I have to write code like this:

struct binary_data
{
    int id;
    char name[8];
    struct othertype filed;
    *
    *
} __attribute__((aligned(sizeof(VAR_INT32))));

// sender
struct binary_data data;
Variant::list list;
list.push_back(data.id);
list.push_back(data.name);
for (int i =3D 0, *p =3D (int*)&data.field; i <
sizeof(data.field)/sizeof(VAR_INT32); i++)
{
    list.push_back(*(p + i));
}

// receiver
struct binary_data data;
data.id =3D list.pop_front(); // wrong grammer, but I believe you
understand what I mean:-)
data.name =3D list.pop_front();
for (int i =3D 0, *p =3D (int*)&data.filed; i <
sizeof(data.field)/sizeof(VAR_INT32) ; i++)
{
    *(p + i) =3D list.pop_front();
}

It's a little wierd:-)

I wonder if my code is a good programming style.

=E5=9C=A8 2012=E5=B9=B44=E6=9C=881=E6=97=A5 =E4=B8=8B=E5=8D=8810:15=EF=BC=
=8CChuck Rolke <crolke@redhat.com> =E5=86=99=E9=81=93=EF=BC=9A
> Hi,
>
> The http://qpid.apache.org/books/0.14/Programming-In-Apache-Qpid/html/ind=
ex.html guide describes what you are trying to do. Take a look at the the :=
:List type. As implemented by Qpid the List type maps an array into a singl=
e AMQP message object. For example you can send a single int in a message a=
nd the AMQP encoding will be <int:value>. Or you can send an array of int a=
s a list encoded as <list: type=3Dint, size=3Dn, value, value, value...>. U=
sing this strategy is a good idea as your receiver will receive the array w=
ithout any explicit packing, unpacking, or byte swapping. Again, the Progra=
mming-In document describes this.
>
> You can deal with messages using raw bytes as easily as with using string=
s. See paste from Message.h below. With this method you can send arbitrary =
blocks of binary data no problem.
>
> Regards,
> Chuck
>
>
> =C2=A0 =C2=A0/**
> =C2=A0 =C2=A0 * Set the content to the data held in the string parameter.=
 Note:
> =C2=A0 =C2=A0 * this is treated as raw bytes and need not be text. Consid=
er
> =C2=A0 =C2=A0 * setting the content-type to indicate how the data should =
be
> =C2=A0 =C2=A0 * interpreted by recipients.
> =C2=A0 =C2=A0 */
> =C2=A0 =C2=A0QPID_MESSAGING_EXTERN void setContent(const std::string&);
> =C2=A0 =C2=A0/**
> =C2=A0 =C2=A0 * Copy count bytes from the region pointed to by chars as t=
he
> =C2=A0 =C2=A0 * message content.
> =C2=A0 =C2=A0 */
> =C2=A0 =C2=A0QPID_MESSAGING_EXTERN void setContent(const char* chars, siz=
e_t count);
>
> =C2=A0 =C2=A0/** Get the content as a std::string */
> =C2=A0 =C2=A0QPID_MESSAGING_EXTERN std::string getContent() const;
> =C2=A0 =C2=A0/**
> =C2=A0 =C2=A0 * Get a const pointer to the start of the content data. The
> =C2=A0 =C2=A0 * memory pointed to is owned by the message. The getContent=
Size()
> =C2=A0 =C2=A0 * method indicates how much data there is (i.e. the extent =
of the
> =C2=A0 =C2=A0 * memory region pointed to by the return value of this meth=
od).
> =C2=A0 =C2=A0 */
> =C2=A0 =C2=A0QPID_MESSAGING_EXTERN const char* getContentPtr() const;
> =C2=A0 =C2=A0/** Get the size of content in bytes. */
> =C2=A0 =C2=A0QPID_MESSAGING_EXTERN size_t getContentSize() const;
>
>
>
> ----- Original Message -----
>> From: "Zhihua Che" <zhihua.che@gmail.com>
>> To: "users" <users@qpid.apache.org>
>> Sent: Sunday, April 1, 2012 6:10:37 AM
>> Subject: Is there compelte API reference and How serialize byte array li=
ke int array[n]
>>
>> Hi, everyone
>>
>> =C2=A0 =C2=A0 I'm using qpid to transfer binary data. I find that Varian=
t is
>> designed for this purpose. But I also find that it only can serialize
>> character string.
>> =C2=A0 =C2=A0 I wonder if there is straight way to serialize byte stream=
.
>>
>> =C2=A0 =C2=A0By the way, Is there complete API reference available? The
>> documents I find are just tutorial and I wonder if I can learn more
>> APIs or details about qpid from somewhere.
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@qpid.apache.org
>> For additional commands, e-mail: users-help@qpid.apache.org
>>
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@qpid.apache.org
> For additional commands, e-mail: users-help@qpid.apache.org
>

---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@qpid.apache.org
For additional commands, e-mail: users-help@qpid.apache.org