Objective-C

Bind and Listen on an Available Port in a Range

Demonstrates Socket.BindAndListenPortRange, which searches an inclusive port range for an available TCP port, binds it, and begins listening. It returns the selected port, or -1 on failure.

Background. This is useful when any of several ports is acceptable and the application needs to discover which one was bound.

Chilkat Objective-C Downloads

Download Chilkat for Objective-C

Objective-C

#import <CkoSocket.h>

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

//  Search the inclusive port range for an available TCP port, bind it, and begin listening.  The
//  method returns the selected port, or -1 when no port can be bound.
int boundPort = [[socket BindAndListenPortRange: [NSNumber numberWithInt: 5000] endPort: [NSNumber numberWithInt: 5100] backLog: [NSNumber numberWithInt: 25]] intValue];
if (boundPort < 0) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Listening on port ",boundPort);