Objective-C

Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods. Objective-C

#import <CkoSocket.h>
#import <CkoBinData.h>

BOOL success = NO;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

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

//  --------------------------------------------------------------------
//  This example uses the public TCP echo service at https://tcpbin.com/
//  --------------------------------------------------------------------

BOOL useTls = NO;
int port = 4242;
int maxWaitMs = 5000;
success = [sock Connect: @"tcpbin.com" port: [NSNumber numberWithInt: port] ssl: useTls maxWaitMs: [NSNumber numberWithInt: maxWaitMs]];
if (success == NO) {
    NSLog(@"%@",sock.LastErrorText);
    return;
}

//  Wait a max of 2 seconds for a response..
sock.MaxReadIdleMs = [NSNumber numberWithInt:2000];

//  Send 26 bytes contained in a Chilkat BinData
CkoBinData *bdToSend = [[CkoBinData alloc] init];
int i = 0;
int byteVal = 65;
while (i < 26) {
    [bdToSend AppendByte: [NSNumber numberWithInt: byteVal]];
    byteVal = byteVal + 1;
    i = i + 1;
}

//  Send the contents of the BinData
//  Pass zero's in the 2nd and 3rd arguments to send the entire contents of the BinData.
[sock SendBd: bdToSend offset: 0 numBytes: 0];

//  The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
[sock SendByte: [NSNumber numberWithInt: 10]];

//  The echo server will echo back whatever is sent to it.
//  We should be able to read the same bytes back..
CkoBinData *bdRecv = [[CkoBinData alloc] init];
//  Receive the 26 bytes previously sent, plus the LF char.
success = [sock ReceiveBdN: 27 binData: bdRecv];
if (success == NO) {
    NSLog(@"%@",sock.LastErrorText);
    return;
}

//  Show the contents of bdRecv in hex format
NSLog(@"%@",[bdRecv GetEncoded: @"hex"]);

//  Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A