Calling method is causing Error creating LLDB target - ios

Question

I am trying to make my first Objective-C library. I am creating a method which will take in a UIImage and return NSMutableData. I have created the following:
+ (NSMutableData *)GetDataToSendToPrinter:(UIImage *)image
{
int maxWidth = 100;
BOOL drawerKick = YES;
BOOL compressionEnable = YES;
RasterDocument *rasterDoc = [[RasterDocument alloc] initWithDefaults:RasSpeed_Medium endOfPageBehaviour:RasPageEndMode_FeedAndFullCut endOfDocumentBahaviour:RasPageEndMode_FeedAndFullCut topMargin:RasTopMargin_Standard pageLength:0 leftMargin:0 rightMargin:0];
StarBitmap *starbitmap = [[StarBitmap alloc] initWithUIImage:image :maxWidth :false];
NSMutableData *commandsToPrint = [[NSMutableData alloc] init];
NSData *shortcommand = [rasterDoc BeginDocumentCommandData];
[commandsToPrint appendData:shortcommand];
shortcommand = [starbitmap getImageDataForPrinting:compressionEnable];
[commandsToPrint appendData:shortcommand];
shortcommand = [rasterDoc EndDocumentCommandData];
[commandsToPrint appendData:shortcommand];
if (drawerKick == YES) {
[commandsToPrint appendBytes:"\x07"
length:sizeof("\x07") - 1]; // KickCashDrawer
}
[starbitmap release];
[rasterDoc release];
return commandsToPrint;
}
Just for testing purposes, I am trying to call it from a button click event:
- (IBAction)DevButton_TouchUpInside:(id)sender {
UIImage *imageToPrint = [UIImage imageNamed:#"image1.png"];
// NSMutableData *commandsToPrint = [[NSMutableData alloc] init];
// *commandsToPrint=[self GetDataToSendToPrinter:imageToPrint];
//This is where I call it
NSMutableData *commandsToPrint = [self GetDataToSendToPrinter:imageToPrint];
int commandSize = (int)[commandsToPrint length];
unsigned char *dataToSentToPrinter = (unsigned char *)malloc(commandSize);
[commandsToPrint getBytes:dataToSentToPrinter];
NSString *portName = #"TCP:10.0.1.4";
NSString *portSettings = #"Standard";
NSMutableString *message;
SMPort *starPort = nil;
starPort = [SMPort getPort:portName :portSettings :10000];
[starPort writePort:dataToSentToPrinter :0 :commandSize];
}
However I keep getting the following crash when clicking on the button:
Warning: Error creating LLDB target at path '/Users/.../Library/Developer/Xcode/DerivedData/IOS_SDK-cjctcqoxudpegpadjbwitveqtkso/Build/Products/Debug-iphonesimulator/StarIO SDK.app'- using an empty LLDB target which can cause slow memory reads from remote devices.
2014-09-26 18:39:22.588 StarIO SDK[17823:513276] -[IOS_SDKViewControllerRasterMode GetDataToSendToPrinter:]: unrecognized selector sent to instance 0xb366260
2014-09-26 18:39:22.624 StarIO SDK[17823:513276] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[IOS_SDKViewControllerRasterMode GetDataToSendToPrinter:]: unrecognized selector sent to instance 0xb366260'
*** First throw call stack:
(
0 CoreFoundation 0x021c4df6 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x01c49a97 objc_exception_throw + 44
2 CoreFoundation 0x021cca75 -[NSObject(NSObject) doesNotRecognizeSelector:] + 277
3 CoreFoundation 0x021159c7 ___forwarding___ + 1047
4 CoreFoundation 0x0211558e _CF_forwarding_prep_0 + 14
5 StarIO SDK 0x000428bb -[IOS_SDKViewControllerRasterMode DevButton_TouchUpInside:] + 107
6 libobjc.A.dylib 0x01c5f7cd -[NSObject performSelector:withObject:withObject:] + 84
7 UIKit 0x0042179d -[UIApplication sendAction:to:from:forEvent:] + 99
8 UIKit 0x0042172f -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
9 UIKit 0x00554a16 -[UIControl sendAction:to:forEvent:] + 69
10 UIKit 0x00554e33 -[UIControl _sendActionsForEvents:withEvent:] + 598
11 UIKit 0x0055409d -[UIControl touchesEnded:withEvent:] + 660
12 UIKit 0x00471aba -[UIWindow _sendTouchesForEvent:] + 874
13 UIKit 0x00472595 -[UIWindow sendEvent:] + 791
14 UIKit 0x00437aa9 -[UIApplication sendEvent:] + 242
15 UIKit 0x004478de _UIApplicationHandleEventFromQueueEvent + 20690
16 UIKit 0x0041c079 _UIApplicationHandleEventQueue + 2206
17 CoreFoundation 0x020e87bf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
18 CoreFoundation 0x020de2cd __CFRunLoopDoSources0 + 253
19 CoreFoundation 0x020dd828 __CFRunLoopRun + 952
20 CoreFoundation 0x020dd1ab CFRunLoopRunSpecific + 443
21 CoreFoundation 0x020dcfdb CFRunLoopRunInMode + 123
22 GraphicsServices 0x03b8c24f GSEventRunModal + 192
23 GraphicsServices 0x03b8c08c GSEventRun + 104
24 UIKit 0x0041fe16 UIApplicationMain + 1526
25 StarIO SDK 0x000027e2 main + 130
26 libdyld.dylib 0x036f0ac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
I asume I am missing something really basic. It's the first Objective-C method I have created, I'm just looking at building a simple library I can then wrap in a Xamarin binding. Where am I going wrong?

Answer 1

You're calling a class method from an instance method.
+ (NSMutableData *)GetDataToSendToPrinter:(UIImage *)image //Should be called using the class name
- (IBAction)DevButton_TouchUpInside:(id)sender //Should be called using self
I'm not sure how that compiled actually, you should've gotten an error like this:
No visible #interface for IOS_SDKViewControllerRasterMode declares the selector 'GetDataToSendToPrinter:'
Per the log it spit out, it's not finding the function GetDataToSendToPrinter:. Try calling it as a class method:
NSMutableData *commandsToPrint = [IOS_SDKViewControllerRasterMode GetDataToSendToPrinter:imageToPrint];