iOS Touch Event Notifications (Private API)

iOS touch event notifications (private API)

You can use the IOHID stuff in IOKit to get the x, y coordinates.

#include <IOHIDEventSystem.h>

create IOHIDEventSystemClient:

void *ioHIDEventSystem = IOHIDEventSystemClientCreate(kCFAllocatorDefault);

register callback:

IOHIDEventSystemClientScheduleWithRunLoop(ioHIDEventSystem, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
IOHIDEventSystemClientRegisterEventCallback(ioHIDEventSystem, handle_event, NULL, NULL);

unregister callback:

IOHIDEventSystemClientUnregisterEventCallback(ioHIDEventSystem, handle_event, NULL, NULL);
IOHIDEventSystemClientUnscheduleWithRunLoop(ioHIDEventSystem, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);

callback:

void handle_event (void* target, void* refcon, IOHIDServiceRef service, IOHIDEventRef event) {
   if (IOHIDEventGetType(event)==kIOHIDEventTypeDigitizer){
       IOHIDFloat x=IOHIDEventGetFloatValue(event, (IOHIDEventField)kIOHIDEventFieldDigitizerX);
       IOHIDFloat y=IOHIDEventGetFloatValue(event, (IOHIDEventField)kIOHIDEventFieldDigitizerY);
       int width = [[UIScreen mainScreen] bounds].size.width;
       int height = [[UIScreen mainScreen] bounds].size.height;
       NSLog(@"click : %f, %f", x*width, y*height) ;
   }
}

Also, you can check this out:
IOHIDEventSystemCreate on iOS6 failed.
Hope this helps.

EDIT: Please see the result from the log. Tested on iPhone 4 and 5.

void handle_event (void* target, void* refcon, IOHIDServiceRef service, IOHIDEventRef event) {
    NSLog(@"handle_event : %d", IOHIDEventGetType(event));
if (IOHIDEventGetType(event)==kIOHIDEventTypeDigitizer){
    IOHIDFloat x=IOHIDEventGetFloatValue(event, (IOHIDEventField)kIOHIDEventFieldDigitizerX);
    IOHIDFloat y=IOHIDEventGetFloatValue(event, (IOHIDEventField)kIOHIDEventFieldDigitizerY);
    NSLog(@" x %f : y %f", x, y);
//2013-03-28 10:02:52.169 MyIOKit[143:907] handle_event : 11
//2013-03-28 10:02:52.182 MyIOKit[143:907]  x 0.766754 : y 0.555023
}
}

How can I simulate the touch events by IOHIDEvent?

As I mentioned in my answer to your other question today, you might try looking at GSEvent.h from GraphicsServices.framework, or in IOKit.framework.

Here are some good answers on stackoverflow to help you:

iOS Private API: lock device and power off the screen

GSSendEvent - Inject Touch Event iOS

iOS touch event notifications (private API)

Ideal way to notify ios application about an event from an SDK

I suggest you to use delegate instead of NSNotification :

• You probably want only 1 response to your call, so if you need NSNotification, nothing prevent the client app to answer it several times.

• If the user need notification, he can implement it himself inside your delegates methods.

• Delegates provide instant response, NSNotification is asynchronous. If you need information from client, you should ask for a sync response.

Cheers

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