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Objective-C

Receive a 16-bit Integer from a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.ReceiveInt16, which reads exactly two bytes as a 16-bit integer and stores the result in the ReceivedInt property. Byte order and signedness are selectable.

Background. Fixed-size integers and length prefixes are common building blocks for application-defined binary protocols. Byte order is selectable, with big-endian being network byte order.

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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;
}

//  Read exactly two bytes as a 16-bit integer and store the result in the ReceivedInt property.
//  The 1st argument selects byte order (true = big-endian); the 2nd selects unsigned interpretation.
BOOL bBigEndian = YES;
BOOL bUnsigned = NO;
success = [socket ReceiveInt16: bBigEndian bUnsigned: bUnsigned];
if (success == NO) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Received 16-bit integer: ",[socket.ReceivedInt intValue]);