Re: Why it can not work after I delete breakpoint.(attach the CSocketFile object to a CArchive)

"jmarc" <>
Tue, 02 Sep 2008 15:08:35 GMT
Sure it is not a good idea to declare a static buffer
in a method, like this. I assume the reader have a
minimum knokedge to cope with some data storage..

The goal of my post was to help. Trying to give a
little hint the requester may find usefull and being
able to go forward with his work... Just posting
the most short example as possible.

I thought this forum was a place to help each other
and a place to learn a lot. I got pretty good answers
that help me, and trying to pay back when posting
some little answer...

My apps run 5 differents IP connections, answering
more than 30 clients apps, sending messages as long
as over 250000 bytes... in a constant exchange
between them.. When a user move an item in a
scrolling list, the same item is also moving on all other
workstations, if users are viewing the same scrolling
list on their applications... So, in my opinion, sending
and receiving data over IP, is a really basic things to do
in software applications. Managing the whole thing,
in a multi-users client/server appliations suite, is a far more
challenging task..

So, don't worry about viewing any other posting form me,
Joseph. This was the last time, forever..!


"Joseph M. Newcomer" <> wrote in message

On Fri, 29 Aug 2008 22:23:56 GMT, "jmarc" <>

Despite any breakpoints in or out. This is
hard to develop socket implementation
with the use of breakpoints... Like Joseph
said, timings are wrong...

My own code do the following way.. and
work very well.

void CMyOwnSocket::OnReceive(int nErrorCode)
   // At least, check if something goes wrong with sub system..

   if(nErrorCode == WSAENETDOWN)
           // Up to you to behave on this..

   // I do the process I need before calling the CSocket::OnReceive

   static BYTE localbuffer[10000];

NEVER declare a local static variable like this. It means you cannot have
more than one
connection at a time! There is no reason this needs to exist, ever, for
any imaginable
reason. Allocate a buffer in the class as a class member, and using
CArray<BYTE>, or std::vector<BYTE> makes far more sense than a
static-sized buffer. But
generally assume that writing a local static variable is a programming
error, and in the
incredibly rare once-a-decade situations where you need one, you will know
it. This is
absolutely NOT one of those situations. It is best to forget you ever
heard of the
concept of declaring static variables inside functions (the only time it
seems to make
sense is if the declaration is preceded by the word 'const', which means
it is not a
"variable" but a "named constant" (or named constant table)).

This code is really dangerous and should not be used.

   int lgtoreceive = 5000; // or some calculation to
know how many bytes to receive..

If the message coming down doesn't either implicitly or explicitly give
you the number of
bytes to receive, you probably need to redesign your protocol. So
choosing a random
number like the above could best be written as
int Igtoreceive = rand();
and be as valid. Which is what is happening anyway. You can assume the
number of bytes
received is a random value which will differ on each receive call.

Take a look at my discussion about a simple network packet protocol on my
MVP Tips site,
in my rewrite of the KB article on multithreaded sockets.

   int lgreceive = Receive(&localbuffer, lgtoreceive); // Acquire the
   // Up to you the way to handle the received data..

   // .. at last, call the base class implementation... This is a way
suggest to do.. somewhere

You will receive from 1 to Igtoreceive bytes. Then you will have to deal
with how you are
going to deal with the rest of the bytes. This is one of the most common
errors in socket
programming, the expectation that data is received all at once. Data is
received in
pieces of arbitrary length that usually bear zero correlation to the size
of the
information that was sent. If I send 8192 bytes, I will get require
between 1 and n
Receive operations to get the data, where n is unknown, unpredictable, and
changes from
second to second so that no two 8192-byte packets will be received in the
same way.

The fact that the "breakpoint" changes the behavior means that the OP is
harboring some
delusion that there is the slightest correspondence between what is sent
and what is
received, which is not true. The slightest change in timing will produce
results, which means the code is wrong.

At the very minimum you need some kind of finite-state-machine reader
which knows how to
assemble data blocks out of an incoming stream of data. This means the
stream has to
encode the packet information in some way, and the number of ways this can
be done is
fairly large: all packets are n bytes; packets that start with the letter
'A' are 22
bytes, with 'B' are 74 bytes, etc.; each packet starts with a 16-bit or
32-bit length
count of the number of data bytes; and on and on. But ultimately, you
have to assume that
you are processing a stream of data, and it is the responsibility of the
receiver to
assemble this data in a meaninful fashion as it comes in as a series of
operations. (Note that if, to determine the size, you have to read more
than one byte,
then you have to assume that you cannot read all the bytes in a single
Receive operation;
my code encodes the length in 32 bits, and assumes that any given Receive
will split one
of these length descriptions in the middle, which is what you have to

This is why I asked for more information.

The above code may or may not work, but can only work for a single
connection (I might
support several dozen concurrent connections), and the handwave about how
to handle the
data is, unfortunately, the key part the OP probably needs.


.. But there are other ways to handle sockets...

Many of which work. And work with multiple connections.


"zjs" <> wrote in message

class CChatSocket : public CSocket
void CChatSocket::OnReceive(int nErrorCode)
CSocket::OnReceive(nErrorCode);//Here I insert a breakpoint,


It works well if I insert a breakpoint int the CHATTER (Client). but If
delete that breakpoint, OnReceive function can not receive
course CHATSRVR have the breakpoint too.the onlye changing is

the source code is in MSDN (CHATTER and CHATSRVR)

Joseph M. Newcomer [MVP]
MVP Tips:

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