EADSessionTransferViewController.m

/*
 
     File: EADSessionTransferViewController.m
 Abstract: n/a
  Version: 1.1
 
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 */
 
#import "EADSessionTransferViewController.h"
#import "EADSessionController.h"
 
@implementation EADSessionTransferViewController
 
@synthesize
    receivedBytesLabel = _receivedBytesLabel,
    stringToSendTextField = _stringToSendTextField,
    hexToSendTextField = _hexToSendTextField;
 
// send test string to the accessory
- (IBAction)sendString:(id)sender;
{
    if ([_stringToSendTextField isFirstResponder]) {
        [_stringToSendTextField resignFirstResponder];
    }
 
    const char *buf = [[_stringToSendTextField text] UTF8String];
    if (buf)
    {
        uint32_t len = strlen(buf) + 1;
        [[EADSessionController sharedController] writeData:[NSData dataWithBytes:buf length:len]];
    }
}
 
// Interpret a UITextField's string at a sequence of hex bytes and send those bytes to the accessory
- (IBAction)sendHex:(id)sender;
{
    if ([_hexToSendTextField isFirstResponder]) {
        [_hexToSendTextField resignFirstResponder];
    }
 
    const char *buf = [[_hexToSendTextField text] UTF8String];
    NSMutableData *data = [NSMutableData data];
    if (buf)
    {
        uint32_t len = strlen(buf);
 
        char singleNumberString[3] = {'\0', '\0', '\0'};
        uint32_t singleNumber = 0;
        for(uint32_t i = 0 ; i < len; i+=2)
        {
            if ( ((i+1) < len) && isxdigit(buf[i]) && (isxdigit(buf[i+1])) )
            {
                singleNumberString[0] = buf[i];
                singleNumberString[1] = buf[i + 1];
                sscanf(singleNumberString, "%x", &singleNumber);
                uint8_t tmp = (uint8_t)(singleNumber & 0x000000FF);
                [data appendBytes:(void *)(&tmp) length:1];
            }
            else
            {
                break;
            }
        }
 
        [[EADSessionController sharedController] writeData:data];
    }
}
 
// send 10K of data to the accessory.
- (IBAction)send10K:(id)sender
{
#define STRESS_TEST_BYTE_COUNT 10000
    uint8_t buf[STRESS_TEST_BYTE_COUNT];
    for(int i = 0; i < STRESS_TEST_BYTE_COUNT; i++) {
        buf[i] = (i & 0xFF);  // fill buf with incrementing bytes;
    }
 
    [[EADSessionController sharedController] writeData:[NSData dataWithBytes:buf length:STRESS_TEST_BYTE_COUNT]];
}
 
#pragma mark UIViewController
 
- (void)viewWillAppear:(BOOL)animated
{
    // watch for the accessory being disconnected
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_accessoryDidDisconnect:) name:EAAccessoryDidDisconnectNotification object:nil];
    // watch for received data from the accessory
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_sessionDataReceived:) name:EADSessionDataReceivedNotification object:nil];
 
    EADSessionController *sessionController = [EADSessionController sharedController];
 
    _accessory = [[sessionController accessory] retain];
    [self setTitle:[sessionController protocolString]];
    [sessionController openSession];
}
 
- (void)viewWillDisappear:(BOOL)animated
{
    // remove the observers
    [[NSNotificationCenter defaultCenter] removeObserver:self name:EAAccessoryDidConnectNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:EADSessionDataReceivedNotification object:nil];
 
    EADSessionController *sessionController = [EADSessionController sharedController];
 
    [sessionController closeSession];
    [_accessory release];
    _accessory = nil;
}
 
- (void)viewDidUnload
{
    [super viewDidUnload];
    self.receivedBytesLabel = nil;
    self.stringToSendTextField = nil;
    self.hexToSendTextField = nil;
}
 
#pragma mark UITextFieldDelegate
 
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return YES;
}
 
#pragma mark Internal
 
- (void)_accessoryDidDisconnect:(NSNotification *)notification
{
    if ([[self navigationController] topViewController] == self)
    {
        EAAccessory *disconnectedAccessory = [[notification userInfo] objectForKey:EAAccessoryKey];
        if ([disconnectedAccessory connectionID] == [_accessory connectionID])
        {
            [[self navigationController] popViewControllerAnimated:YES];
 
        }
    }
}
 
// Data was received from the accessory, real apps should do something with this data but currently:
//    1. bytes counter is incremented
//    2. bytes are read from the session controller and thrown away
- (void)_sessionDataReceived:(NSNotification *)notification
{
    EADSessionController *sessionController = (EADSessionController *)[notification object];
    uint32_t bytesAvailable = 0;
 
    while ((bytesAvailable = [sessionController readBytesAvailable]) > 0) {
        NSData *data = [sessionController readData:bytesAvailable];
        if (data) {
            _totalBytesRead += bytesAvailable;
        }
    }
 
    [_receivedBytesLabel setText:[NSString stringWithFormat:@"Bytes Received from Session: %d", _totalBytesRead]];
}
 
@end