Hi Daniel,
Thank you for the response.
Our app provides the user with an option of using system shortcut keys for
capturing.
For example,
Suppose Cmd+Shift+4 is the system shortcut used to capture the full screen;
user can use the same combination of keys to capture the full screen from my
app.
If I use the Hot key API RegisterEventHotKey(), I cannot override the system
behavior with my app behavior for the shortcut Cmd+Shift+4.
So, I am using the tapping mechanism if user wants to override system behavior.
But, sometimes I do not get any callback. How do I solve this?
Regards,
Deepa
On 08-Mar-2011, at 2:31 PM, Jean-Daniel Dupas wrote:
>
> Le 8 mars 2011 à 04:40, Deepa a écrit :
>
>> Hi,
>>
>> I am developing a desktop application that supports one of the feature
>> through Hot Key. I am using Event Tap for this to work.
>>
>> But, sometimes (randomly) the callback is not invoked; Hot Key does not work
>> and hence the feature seems to be not working.
>>
>> Could someone help me out in identifying the problem here.
>>
>> Following is the code snippet:
>>
>> -( void )startEventTapinThread //Called in a separate thread.
>> {
>> NSAutoreleasePool *pool =[ [ NSAutoreleasePool alloc] init];
>>
>> CFRunLoopRef runloop =(CFRunLoopRef)CFRunLoopGetCurrent();
>> CGEventMask interestedEvents =
>> CGEventMaskBit(kCGEventFlagsChanged)|CGEventMaskBit(kCGEventKeyDown);
>> CFMachPortRef eventTap = CGEventTapCreate(kCGSessionEventTap,
>> kCGHeadInsertEventTap, 0, interestedEvents, myCGEventCallback, self);
>> //self is the object pointer our method
>> CFRunLoopSourceRef source =
>> CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0);
>> CFRunLoopAddSource((CFRunLoopRef)runloop , source,
>> kCFRunLoopCommonModes);
>> CFRunLoopRun();
>> [ pool release];
>> }
>>
>> CGEventRef myCGEventCallback(CGEventTapProxy proxy, CGEventType type,
>> CGEventRef event, void *refcon)
>> {
>> CGEventType eventType = CGEventGetType(event);
>> //execute the code related to feature
>> }
>
>
>
> Why you don't use the HotKey API instead (RegisterEventHotKey()) ? It does
> not require root access or accessibility enabled and it works quite well.
>
>
> -- Jean-Daniel
>
>
>
>
>
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