Implementing non-blocking sockets

[Navin]

Hi Friends,


By default member functions( e.g. Connect(), Receive() ) of CSocket class operate in blocking mode, how do I change it to non-blocking mode.


Also is there any way I can specify timeout value for such type of functions, especially Receive() function ??


Regards,

Navin.

[Steve Dwire]

To make it non-blocking, use CAsyncSocket instead. CSocket is derived from CAsyncSocket, and what it adds is the blocking code.

[bsmanoj]

Dear navin,

use a derived class from CSocket and try, a sample can be like this

class NavinSocekt::public CSocket

{

public:

NavinSocket();

~NavinSocket();

/*all these function are the local implementation of the virtuall callback functions

provided in the CAsyncSocket*/

void OnReceive(int nErrorCode); //this function willbe called when paket arrives

void OnSend(int nErrorCode); // will be called when a packet is sent

void OnConnect(int nErrorCode); // will be called when gets connected

void OnAccept(int nErrorCode); // will be called when accepted

void OnError(int nErrorCode); // will be calle dwhen erro happpends

void OnClose(int nErrorCode); //

}

// all the virtual call back function should be locally implemented depending on your need

void NavinSocekt::OnReceive(int nErrorCode)

{

/*will be called when a packet arrives*/

if(nErrorCode)

printf("error in on receive of NAvin socket");

char buffer[max_size];

/* this function call won't be a blocking call*/

int recdBytes = receive(buffer,max_size,.....);

/*received packet is available at buffer*/

return;

}

with this you don't have to poll for the packet arrival, instead it will call back your virtual functions

whenevera packet is arrived.

hope this will solv your issue.

thanks

bsmanoj

[Samar Aarkotti]

this makes the socket non-blocking
or else AsyncSocket will do....

ioctl (Socket, FIONBIO, &action);

[Dima Semenov]

see Timeout with MFC sockets here

[Ravi Bhavnani]

Navin,

Check out http://www.codeguru.com/internet/timeoutsocket.shtml.

/ravi