Wait for a Socket to Become Readable

See more Socket/SSL/TLS Examples

Demonstrates Socket.SelectForReading, which waits for read-ready activity on the socket, or on any contained socket when the object is a socket set. It returns 1 if ready, 0 on timeout, or -1 on error.

#import <CkoSocket.h>

BOOL success = NO;

CkoSocket *socket = [[CkoSocket alloc] init];

//  Connect to the server using TLS.
BOOL bTls = YES;
int maxWaitMs = 5000;
success = [socket Connect: @"example.com" port: [NSNumber numberWithInt: 5000] ssl: bTls maxWaitMs: [NSNumber numberWithInt: maxWaitMs]];
if (success == NO) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

//  Wait up to 5 seconds for read-ready activity on the socket (or, for a socket set, on any contained
//  socket).  Returns 1 if ready, 0 on timeout, or -1 on error.
int ready = [[socket SelectForReading: [NSNumber numberWithInt: 5000]] intValue];
if (ready < 0) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

if (ready != 1) {
    NSLog(@"%@",@"No data became available before the timeout.");
    return;
}

NSLog(@"%@",@"The socket has data ready to read.");