Objective-C
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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#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]);