Re: Copying Few Octets from Vector

From:

"Alf P. Steinbach" <alfps@start.no>

Newsgroups:

comp.lang.c++

Date:

Fri, 10 Apr 2009 19:50:35 +0200

Message-ID:

<gro0rs$ht1$1@news.motzarella.org>

* smilesonisamal@gmail.com:

On Apr 10, 10:10 pm, "Alf P. Steinbach" <al...@start.no> wrote:

* smilesonisa...@gmail.com:

Hi all,
I am facing difficulty in copying few octets from a vector to a
buffer.
typedef unsigned char uint8_t;
I have a vector std::vector<uint8_t*> m_Data;
which contains the following octets. I want to copy (30 74 64 230 0 8)
to a buffer. I saw in the web and got code where iterator is used to
copy all the octets not partial elements. How will I retrieve 6 octets
from the vector? I am new to C++ and facing lot of problems in
conversion. I tried a lot but couldnot succeed.Could anybody help me
in this regard?
Any example source code will be great help.
Vector Elements
-------------------------
1 0 94 0 0 2 0 30 74 64 230 0 8 0 69 0 0 48 0 0 0 0 1 17 168 216 146
223 158 3 2
24 0 0 2 7 193 7 193 0 28 81 57 0 0 8 3 10 100 5 0 99 105 115 99 111 0
0 0 146 2
23 158 1
Regards
Soni

Please explain your data structure.

You have a vector of pointers.

Is it the first pointer in the vector that points to the data listed above?

First pointer of vector points to first element of the vector.

The first vector element points to itself?

The first vector element points to the first element of some raw array?

What?

How do you know the data size?

m_Data.size()

You have a vector of pointers.

The number of pointers is quite likely not the size of your numerical data shown
above.

Also, please explain exactly what you're trying to accomplish.

Basically Iam trying to get the first 6 octets of the ethernet packet
(destination mac address) from the packet(decimal format) and try to
compare with the a different mac address.

What do you mean by "decimal format".

Cheers & hth.,

- Alf

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