Check Whether a Socket Is Writable

See more Socket/SSL/TLS Examples

Demonstrates Socket.CheckWriteable, which waits for the connected socket to become writable. It returns 1 if writable, 0 if it did not become writable before the 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 the socket to become writable.  Returns 1 if writable, 0 if it did not
//  become writable before the timeout, or -1 on error.
int writable = [[socket CheckWriteable: [NSNumber numberWithInt: 5000]] intValue];
if (writable < 0) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

if (writable != 1) {
    NSLog(@"%@",@"The socket did not become writable before the timeout.");
    return;
}

NSLog(@"%@",@"The socket is writable.");