C / C++ / MFC

how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 21:32

What do you mean by disable the main window? If your particular process is on the main thread then it will effectively be disabled. If not, then you should set a mutex or other flag to suspend all other threads.

Just say 'NO' to evaluated arguments for diadic functions! Ash

zhiyuan1625-Sep-10 0:42

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 0:42

dear all

i am a newbe, only want to test my program via 2 winsock. client send a data and server can receive data, that is all. anyone can help me? thanks a lot

Richard MacCutchan25-Sep-10 1:38

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 1:38

Try searching the articles here on CodeProject. If you still cannot find any useful samples then try Google/Bing.

Just say 'NO' to evaluated arguments for diadic functions! Ash

zhiyuan1625-Sep-10 3:44

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 3:44

thanks. i searched already, all are the 2 applications, i just want one application for 2 winsock senddata. thanks

Richard MacCutchan25-Sep-10 4:22

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 4:22

zhiyuan16 wrote:
i just want one application

What do you mean by one application? Even if the server and client exist on the same computer they still need to run independently. If you want to run them as a single application then you will need to create different threads for them. Much simpler to have the two separate applications which can then run independently in their own windows.

Just say 'NO' to evaluated arguments for diadic functions! Ash

zhiyuan1625-Sep-10 5:10

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 5:10

i only want to send data from client winsock, and when server receive data, then i want to do other things. that is all. so i only need one application to apply 2 winsock. thanks

Luc Pattyn25-Sep-10 5:30

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 5:30

A proper server would use threads; and a proper client would use threads too. I see no obstacles for having both the server threads and the client threads running together in one process, hence a single app. Just search good examples of server and client, then combine them.

However, when you do that, what is the purpose of your sockets? it is demoted to a simple inter-thread communication scheme then. For which other solutions exist, such as queues, Windows messages, and probably many more.

Smile | :)

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Moak25-Sep-10 11:20

25-Sep-10 11:20

Luc Pattyn wrote:
A proper server would use threads

I often handle both client and server in a single thread context in an application. This is called asynchronous networking or non-blocking sockets... e.g. used by lighttpd.

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Re: how to create client and server winsock in one project or use 2 winsock in one project?

Luc Pattyn25-Sep-10 11:53

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 11:53

you're right, one can use asynchronous operations instead of threads. I tend to prefer threads as asynchronous operations seem more complex, but I do realize they can be a good choice, and have the advantage of saving on stack memory at the expense of some more code.

Also, when borrowing existing code in order to join a server and a client, I expect a thread-oriented approach would be easier to merge than an asynchronous one.

Smile | :)

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Moak25-Sep-10 13:09

25-Sep-10 13:09

Luc Pattyn wrote:
I expect a thread-oriented approach would be easier to merge than an asynchronous one.

It's just copy and paste. Here is a server/client example (last two code snippets), which you can join together in a single application. It wouldn't be very different with MFC's CAsyncSocket or QT's networking classes. I think the asynchronous networking model has is strengths with applications, where you want to focus on protocol an functionality and less on synchronisation and timing.

/M

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Re: how to create client and server winsock in one project or use 2 winsock in one project?

Luc Pattyn25-Sep-10 13:37

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 13:37

yes, OK. Great link BTW.

Smile | :)

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Richard MacCutchan25-Sep-10 21:29

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 21:29

As Luc says, why use sockets within a single application when you can just use a message queue, shared memory etc. However, since you are doing the implementation it is entirely your choice.

Just say 'NO' to evaluated arguments for diadic functions! Ash

zhiyuan1625-Sep-10 23:11

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 23:11

thanks a lot. anyone has such example source code. can anyone send me here. only exchange the data. thanks a lot

Moak25-Sep-10 23:52

25-Sep-10 23:52

zhiyuan16 wrote:
anyone has such example source code. can anyone send me here.

What are your requirements? We know how you want to do it, but not what. Could you describe more detailed what it is you want to solve, for example if you have a practical application problem or experimenting with winsock, then it is much easier to recommend something. Smile | :)

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Re: how to create client and server winsock in one project or use 2 winsock in one project?

zhiyuan1625-Sep-10 23:57

Re: how to create client and server winsock in one project or use 2 winsock in one project?

25-Sep-10 23:57

i just want an example source code with 2 winsock can be run in one project. and can communicate each other.thanks

Moak26-Sep-10 0:59

26-Sep-10 0:59

Yes I know, my question was why. Well, have a look at non-blocking sockets.

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Re: how to create client and server winsock in one project or use 2 winsock in one project?

Richard MacCutchan26-Sep-10 1:04

Memory aligned bit fields

26-Sep-10 1:04

There are lots of sample winsock applications, both here on CodeProject and out where Google will find them. However there probably will not be many with both client and server code in the same app. As has been suggested more than once, you will need to take the code for both halves and put it together for your requirements.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Trevor Johansen24-Sep-10 21:34

Trevor Johansen

24-Sep-10 21:34

I have been using the following code to access individual bits of memory to use as bit fields for a white but I am not really sure how the heck it works. I now need some extended functionality and as I do not understand how it works I can not upgrade it myself.

struct bits {
  uint8_t b0:1;
  uint8_t b1:1;
  uint8_t b2:1;
  uint8_t b3:1;
  uint8_t b4:1;
  uint8_t b5:1;
  uint8_t b6:1;
  uint8_t b7:1;
} __attribute__((__packed__));

#define FMAN(ADDR,FLAG) ((*(volatile struct bits*)&ADDR).b##FLAG)
#define FIFO_EOF FMAN(0x20,1)

FIFO_EOF = 1;

expands to:

((*(volatile struct flags*)&_SFR_IO8(0x20)).b##1) = 1;

Theirs a few casts and pointers in their to make it confusing but Im going on an understanding that it is taking the value of the bits structure and applying the rusult to the memory location 0x20. I wish to upgrade this functionality by using c++ and some added structure so I could have a bitfeld access like below.

Memory location: 0x14000000
bitfield: RX0E, TX0E, RXB0E, TXB0E ..... etc

I would need to somehow initilize my custom bitfiled to the memory location easily so I can include it in my communications class. So in my code I would have the ability to set the entire bitfiled with one word or by individual bits.

COMMS->FLAGS = 0x90000000 // To set RX0E and TXB0E
COMMS->FLAGS->RX0E = 1;   // to set just RX0E
if(COMMS->FLAGS->TXB0E) // Much easier to read than & 0x1000000

Does that make since? I know its possible as all the source code I have poked around in for ARM based processors use this exact method but the implementations are closed source and I have never figured it out. I use GCC if you are wondering.

Anyone care to take a show at helping me figure out how it works and then how to get my desired results? Thanks!

Luc Pattyn24-Sep-10 23:02

24-Sep-10 23:02

a partial answer:

1.
FIFO_EOF = 1;
does not expand to:
((*(volatile struct flags*)&_SFR_IO8(0x20)).b##1) = 1;
it does expand to:
((*(volatile struct flags*)&_SFR_IO8(0x20)).b1) = 1;
as the ## operator inside macro's concatenates strings to yield new identifiers.

2.
you could have something like:

struct bits {
  uint8_t RX0E:1;
  uint8_t TX0E:1;
  uint8_t RXB0E:1;
  uint8_t TCB0R:1;
  ...
} __attribute__((__packed__));

but then of course there no longer is any b0, b1, ...

3.
you could have a union of both structs, then both ways of accessing bits are available.

Smile | :)

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Alain Rist24-Sep-10 23:53

Alain Rist

24-Sep-10 23:53

Hi,

The C++ Standard Library provides various classes to deal with bit fields: std::bitset<size_t>[^] which is oriented to individual bit manipulation, and the specialized std::valarray<bool> and std::vector<bool>. You should consider using them instead of your C like constructs.

With all of them you can use placement new to allocate at a specific memory position.

cheers,
AR

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

Aescleal25-Sep-10 0:56

Aescleal

25-Sep-10 0:56

One cool thing about C++ is that you can keep doing hardware specific stuff in C style structures then add member functions to do the disgusting macro hackery and chicanery that you have to do to simplify your code. So for example if you've got a linear address for a 386 or later you can break it up in the same way as the processor does:

union linear_address_decoder
{
    struct decoded
    {
        unsigned page_directory_entry_ : 10;
        unsigned page_table_entry_ : 10;
        unsigned offset_ : 10;
    }
	decoded_;
    void *encoded_;

    linear_address_decoder( void *p ) : encoded_( p ) {}

    unsigned page_directory_entry() const
    {
        return decoded_.page_directory_entry_;
    }

    // ... ad nauseum...
};

Anyway it sounds like you want to go the other way (assembling a value to be stored in memory) but the principle is the same:

- Declare a union of the bunch of bit fields you're interested in and a primitive type that fills the memory location you want to read/write it from

- Add a constructor that takes the component bits and sticks them in the bit fields

- Have a recovery function to write the assembled value somewhere in memory.

Hope that helps - if I'm not being clear drop us a line and I'll try and clarify things.

Cheers,

Ash