C / C++ / MFC

CPallini12-Oct-08 21:30

CPallini

12-Oct-08 21:30

Well, there are keywords & functions, for instance: strlen, for, printf. Roll eyes | :rolleyes:

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

enhzflep12-Oct-08 21:35

enhzflep

12-Oct-08 21:35

Code:
printf("%02d:%02d:%02d:%02d:%02d:%02d\n", 0x00, 0xff, 0x2e, 0x3f, 0x00, 0x4d);
printf("%02x:%02x:%02x:%02x:%02x:%02x\n", 0x00, 0xff, 0x2e, 0x3f, 0x00, 0x4d);

Output:
00:255:46:63:00:77
00:ff:2e:3f:00:4d

Sakthiu12-Oct-08 22:02

Sakthiu

12-Oct-08 22:02

for me, why happens like this below,

ffffffde:0e:6e:28:53:3d:ffffff88:0d:ffffff87:ffffffc1:ffffffe7:
4f:ffffffe8:ffffff9d:ffffff84:ffffffe8:3d:06:ffffff81:ffffffe0:
ffffff8f:ffffff9a:77:08:75:3d:fffffff1:38:45:ffffff8f:ffffffe8:
ffffffad:03

Thanks,
Sakthi

Nice things do nice works

which should use pipe or socket at Client-server

CPallini12-Oct-08 22:26

CPallini

12-Oct-08 22:26

Hint: you're probably using signed data types. Roll eyes | :rolleyes:

Hint2: FFFFFFDE is -34 (i.e. 222 if unsigned char).
Smile | :)

singh_nav12-Oct-08 19:36

singh_nav

12-Oct-08 19:36

Hi All,

I am working on a client server application.

I am having a challenge that i have to serve the 250 client concurrently. Each request takes 2-5 second to execute at server side.

For this what should i use 1 PIPE implementation or SOCKET with a queue? and why?
Which performance is better.

Thanks

Re: which should use pipe or socket at Client-server

kcynic12-Oct-08 19:59

Re: which should use pipe or socket at Client-server

12-Oct-08 19:59

i think if you have to use udp mode, socket might be better.
otherwise i am afraid pipe is better because you just open and close a connect with every client but there would be more operations for socket.

just my own opinion.

Parthiban12-Oct-08 20:31

Parthiban

12-Oct-08 20:31

hi,

U can use the following arch if u think this better. go with TCP/IP.

1. create one sock which will be in listen mode.
2. once u got a connect request, create one sock and thread dynmically and bind with the requested client. this socket will serve for that client only.

this can be implemented in multithread mode where on thread always listen for client, and each thread will serve for perticular client.

-Parthi

Re: which should use pipe or socket at Client-server

SandipG 12-Oct-08 20:37

SandipG

12-Oct-08 20:37

I will suggest to use IO Completion Ports with sockets.
i will not advise to have 250 threads for 250 clients...
Search CP with IOCP you will get many good articles..
I hope it helps.

Regards,
Sandip.

Re: which should use pipe or socket at Client-server

singh_nav13-Oct-08 19:20

singh_nav

13-Oct-08 19:20

Thanks for the input,

Will it work for the different platform.
I am to create the server for WINDOWS, Linux and MAC.

Thanks

Re: which should use pipe or socket at Client-server

SandipG 13-Oct-08 21:30

SandipG

13-Oct-08 21:30

singh_nav wrote:
I am to create the server for WINDOWS, Linux and MAC.

No..
I dont know anything that will work with all three platforms.
I don't understand why server needs to be built for different platforms.
You can have a server on one platform and you can built clients on different platforms.
Your application might have that requirement but just a opinion.

Regards,
Sandip.

Re: which should use pipe or socket at Client-server

singh_nav14-Oct-08 17:09

singh_nav

14-Oct-08 17:09

thanks,

Actually my application is build for all these platform.
And i want to design all code into one application, that time i just need to build at different platform only to support it.

Thanks again

Re: which should use pipe or socket at Client-server

SandipG 20-Oct-08 3:46

SandipG

20-Oct-08 3:46

Recently i came across this library
http://www.alhem.net/Sockets/index.html[^]
I hope it helps.

Regards,
Sandip.

How to get IP address?

monsieur_jj12-Oct-08 19:25

12-Oct-08 19:25

Hi all

How do I get my IP address by code? Whats the shortest way possible? I tried getenv but I found out not every computer has their IP add in their environment variables.

Thanks,
Jayjay

kcynic12-Oct-08 19:43

12-Oct-08 19:43

get host name first and then get the details. The following code might be helpful:

char host_name[128];
hostent* host;
gethostname(host_name,128);
host = gethostbyname(host_name);
printf("The local host: Address : %s\n", inet_ntoa(*(struct in_addr*)host->h_addr));

Regards

monsieur_jj12-Oct-08 20:01

12-Oct-08 20:01

Hi kcynic,

the gethostname didnt fill up the host_name. Is there a requirement before using your code?

Thanks,
Jayjay

kcynic12-Oct-08 20:06

12-Oct-08 20:06

did you forget to call WSAStartup？

monsieur_jj12-Oct-08 20:17

12-Oct-08 20:17

Hi kcynic,

It is working now however there is no h_addr just h_addr_list[0] in the struct of hostent, I still can't find the ipadd. Whats your advise on this?

Thanks,
Jayjay

enhzflep12-Oct-08 20:34

enhzflep

12-Oct-08 20:34

Hmm, interesting.

With the following code compiled and linked with wsock32, I get an output of
Hostname: xpDesktop
The local host: Address : 210.84.23.xxx
Press any key to continue . . .

#include <windows.h>
#include <winsock2.h>
#include <stdio.h>

int main()
{
    char host_name[128];
    hostent* host;
    WORD verRequested = MAKEWORD(1,1), err; // version 1.1
    WSADATA wsaData;
    err = WSAStartup(verRequested, &wsaData);
    gethostname(host_name,128);
    printf("Hostname: %s\n", host_name);
    host = gethostbyname(host_name);
    printf("The local host: Address : %s\n", inet_ntoa(*(struct in_addr*)host->h_addr));
    WSACleanup();
    system("pause");
}

kcynic12-Oct-08 20:36

12-Oct-08 20:36

in winsock2.h:

struct hostent {
char FAR * h_name; /* official name of host */
char FAR * FAR * h_aliases; /* alias list */
short h_addrtype; /* host address type */
short h_length; /* length of address */
char FAR * FAR * h_addr_list; /* list of addresses */
#define h_addr h_addr_list[0] /* address, for backward compat */
};

if you call WSAStartup first, you should get the result.

monsieur_jj12-Oct-08 20:42

12-Oct-08 20:42

Actually yes i called WSAStartup first

The host name is jdeguzman however the h_addr_list[0] value is

*jdeguzman

which i dont get why it returns that instead my ip address.

Thanks,
Jayjay

kcynic12-Oct-08 21:01

12-Oct-08 21:01

yes, my result is similar to yours.
and the ip result is returned by calling inet_ntoa function.
what's you code look like?
of course you should check all the callings successful or not. msdn will give you more details i think.

monsieur_jj12-Oct-08 21:18

12-Oct-08 21:18

Its all working now Thanks!