Win32...

I would like to use this article (http://codeproject.com/internet/telnet_server.asp), but it is using MFC. Can someone please help me do it in Win32? My compiler doesn't support MFC and I can't even run MFC programs, because I don't have some DLL files for that in my computer. Don't want either.

Actually, I would like to have a simple program, that waits for a connection on some random port (which I specify), and receives one little string and then closes the connection.

You mean like the examples in the "Beej" tutorial.

Moved to the networking forum, where you'll find more information in the "read first" sticky threads.

Beej examples don't work. I get thousands of errors.

I don't know what's wrong with Beej, even MSDN examples work fine... only that the port is opened only in localhost, so it can only be accessed from the local computer...

Did you pay attention to the bit about "For windows programmers".?
Are you going to post an actual example rather than just "it doesn't work"?

This doesn't work:
http://beej.us/guide/bgnet/output/ht...l#simpleserver

I don't even have the include files?!?!?!?!?!?!

OK, I see I'm going to have to explain this in excruciating detail

Quote:

---

1.5. Note for Windows Programmers
First, ignore pretty much all of the system header files I mention in here. All you need to include is:

#include <winsock.h>

---

So delete all those header files and try including winsock.h

Then read the rest of that paragraph and try again.

Still:

Code:

---

Compiler: Default compiler
Building Makefile: "C:\Programs\Dev-Cpp\telnet\Makefile.win"
Executing  make...
make.exe -f "C:\Programs\Dev-Cpp\telnet\Makefile.win" all
g++.exe -c main.cpp -o main.o -I"C:/Programs/Dev-Cpp/lib/gcc/mingw32/3.4.2/include"  -I"C:/Programs/Dev-Cpp/include/c++/3.4.2/backward"  -I"C:/Programs/Dev-Cpp/include/c++/3.4.2/mingw32"  -I"C:/Programs/Dev-Cpp/include/c++/3.4.2"  -I"C:/Programs/Dev-Cpp/include" 

main.cpp: In function `void sigchld_handler(int)':
main.cpp:11: error: `WNOHANG' undeclared (first use this function)
main.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
main.cpp:11: error: `waitpid' undeclared (first use this function)
main.cpp: In function `int main()':
main.cpp:19: error: `socklen_t' undeclared (first use this function)
main.cpp:19: error: expected `;' before "sin_size"
main.cpp:20: error: aggregate `sigaction sa' has incomplete type and cannot be defined
main.cpp:28: error: cannot convert `int*' to `const char*' for argument `4' to `int setsockopt(SOCKET, int, int, const char*, int)'
main.cpp:50: error: `sigemptyset' undeclared (first use this function)
main.cpp:51: error: `SA_RESTART' undeclared (first use this function)
main.cpp:52: error: `SIGCHLD' undeclared (first use this function)
main.cpp:52: error: invalid use of undefined type `struct sigaction'
main.cpp:20: error: forward declaration of `struct sigaction'
main.cpp:58: error: `sin_size' undeclared (first use this function)
main.cpp:66: error: `fork' undeclared (first use this function)
main.cpp:67: error: `close' undeclared (first use this function)
make.exe: *** [main.o] Error 1
Execution terminated

---

Oh well, lessons in porting code then

Remove all the signal and signal handler stuff
Remove the fork()

> main.cpp:19: error: `socklen_t'
maybe declare it as int?

> main.cpp:28: error: cannot convert `int*' to `const char*'
Try a cast, or stop using C++ to compile C code.

I'd better find some C++ tutorials then, because C is crap (that means I don't like it) and I asked for a C++ example.

Removed fork(), close(), defined socklen_t as int and removed all signal stuff:

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <winsock.h>

#define MYPORT 3490    // the port users will be connecting to

#define BACKLOG 10    // how many pending connections queue will hold
typedef int socklen_t;

int main(void)
{
    int sockfd, new_fd;  // listen on sock_fd, new connection on new_fd
    struct sockaddr_in my_addr;    // my address information
    struct sockaddr_in their_addr; // connector's address information
    socklen_t sin_size;
    int yes=1;

    if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(1);
    }

    if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,(const char*)&yes,sizeof(int)) == -1) {
        perror("setsockopt");
        exit(1);
    }
   
    my_addr.sin_family = AF_INET;        // host byte order
    my_addr.sin_port = htons(MYPORT);    // short, network byte order
    my_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP
    memset(&(my_addr.sin_zero), '\0', 8); // zero the rest of the struct

    if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr))
                                                                  == -1) {
        perror("bind");
        exit(1);
    }

    if (listen(sockfd, BACKLOG) == -1) {
        perror("listen");
        exit(1);
    }

    while(1) {  // main accept() loop
        sin_size = sizeof(struct sockaddr_in);
        if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr,
                                                      &sin_size)) == -1) {
            perror("accept");
            continue;
        }
        printf("server: got connection from %s\n",
                                          inet_ntoa(their_addr.sin_addr));
    }

    return 0;
}

---

Program just closes and does nothing.
Why can't Beej just make any working example?

And this seems to be missing WSAStartup...

I am wondering why MSDN example works only in the local network...

Here maxorator, I've got a solution for ya. I wrote a program on Dev-C++ using Winsock that does just what you want, a simple server that accepts a connection, receives a string and closes the connection. I commented heavily(at least for me) and put many references in the comments for you, references to the functions being used that is. I hope it's helpful and it compiled error free on Dev-C++. Code attached.

Isn't there a way to make it work without port forwarding...?

So you plan to run this sever behind a router? You don't have to port forward if you're connecting to it from inside the LAN you're on, otherwise you may have to if you want outside connections to your server, through your router.

But some MUD games have run like this on my computer. (Compiled with Cygwin...)

Run like what? Explain.

Receiving connections through some port (usually 4000) even from external networks.

They ran and someone established a connection to it from the outside through your router without port forwarding ? Go get a refund for your router, it's broken.

Can anyone tell me a way to send a char string to a network (from somewhere else) and all my programs in that network will receive the string?