Objective-C

Poll a Socket for Available Data

Demonstrates Socket.PollDataAvailable, which performs a nonblocking check for readable activity and returns whether data or another read-ready condition is present.

Background. This lets an application check for incoming data without blocking, for example in an event loop that services multiple tasks.

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Objective-C

#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;
}

//  Perform a nonblocking check for readable data.  Returns true when data or another read-ready
//  condition is present, and false when nothing is immediately available.
BOOL bAvailable = [socket PollDataAvailable];
if (bAvailable != YES) {
    NSLog(@"%@",@"No data is immediately available.");
}
else {
    NSLog(@"%@",@"Data is available to read.");
}