# Appendix B Code Examples

#### Open Device

```
self.mtSCRALib = [[MTSCRA alloc] init]; 
[self.mtSCRALib 
listenForEvents: TRANS_EVENT_OK|TRANS_EVENT_START|TRANS_EVENT_ERROR)]; 

//iDynamo 
[self.mtSCRALib setDeviceType:(MAGTEKIDYNAMO)]; 
[self.mtSCRALib setDeviceProtocolString:(“com.magtek.idynamo”)]; 

//Audio 
//[self.mtSCRALib setDeviceType:(MAGTEKAUDIOREADER)]; 
[self.mtSCRALib openDevice];
```

#### Close Device

```
[self.mtSCRALib closeDevice];
```

#### Get Track Data from Reader

```
[[NSNotificationCenter defaultCenter] addObserver:self 
selector:@selector(trackDataReady:) name:@"trackDataReadyNotification" 
object:nil];

-  (void)trackDataReady:(NSNotification *)notification
{
    NSNumber *status = [[notification userInfo] 
valueForKey:@"status"];
    [self performSelectorOnMainThread:@selector(onDataEvent:) 
withObject:status waitUntilDone:YES];
}
-  (void)onDataEvent:(id)status
{
    //[self clearLabels];
    switch ([status intValue]) {
    
        case TRANS_STATUS_OK: 
        NSLog(@"TRANS_STATUS_OK");
        break;
        
        case TRANS_STATUS_ERROR: 
        NSLog(@"TRANS_STATUS_ERROR");
        break;
        
        default:
            break;
    }
}
```

#### Get Connection Status of Reader

```
[[NSNotificationCenter defaultCenter] addObserver:self 
selector:@selector(devConnStatusChange) 
name:@"devConnectionNotification" object:nil];

- (void)devConnStatusChange
{
    BOOL isDeviceConnected = [self.mtSCRALib isDeviceConnected]; 
    if (isDeviceConnected)
    {
        self.deviceStatus.text = @"Device Connected";
    }
    else
    {
        self.deviceStatus.text = @"Device Disconnected";
    }
}
```

#### Diagrams

**MSR Card Swipe**

<figure><img src="/files/BBBo2nwu3kuWPEn914r6" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
**Note:** This is broad to cover multiple devices. For devices that do not need or support a specific command, (i.e. SetMSRAlwaysOn), that portion may be omitted in the flow.
{% endhint %}

<figure><img src="/files/E9CF2qJoVTHgXNe6hdmx" alt=""><figcaption></figcaption></figure>

**EMV Transaction (Quick Chip)**

<figure><img src="/files/8G59FMXoQpJOnVdSy3s4" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
**Note**: This is broad to cover multiple devices. For devices that do not need or support a specific command, (i.e. SetMSRAlwaysOn), that portion may be omitted in the flow.
{% endhint %}

<figure><img src="/files/sPg9KbYtEFkBKZGqJe9w" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/Hl6FnfpxVUftmM1JLoAk" alt=""><figcaption></figcaption></figure>

**EMV Transaction (Full)**

<figure><img src="/files/jY3CBXU69jlxAfOlcXSc" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/2vXDA9BJrsavQdXEUyfz" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/Y58uxNEBWs8hJyDzDd5S" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
**Note**: This is broad to cover multiple devices. For devices that do not need or support a specific command, (i.e. SetMSRAlwaysOn), that portion may be omitted in the flow.
{% endhint %}


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