osx - How to discard command+shift+Q command in mac OS X objective c code? -

i'm trying implement screensaver simulator on mac os x , managed disable effect of pressing command+q causing application exit, if it's in full screen mode, not respond quit keyboard shortcut.

but, problem in handling shortcut of ( command+ shift+q) pops confirmation dialog of max os x warns exiting apps , logging of system.

can me in preventing effect of command+shift+q shortcut while being in full screen mode ?

thanks

this best answer question

first in applicationdidfinishedload function, add peace of code create event tap , add event tap in current run loop

    cfmachportref      eventtap; cgeventmask        eventmask; cfrunloopsourceref runloopsource;  // create event tap. interested in key presses. eventmask = ((1 << kcgeventkeydown) | (1 << kcgeventkeyup)); eventtap = cgeventtapcreate(kcgsessioneventtap, kcgheadinserteventtap, 0,                             eventmask, mycgeventcallback, null); if (!eventtap) {     fprintf(stderr, "failed create event tap\n");     exit(1); }  // create run loop source. runloopsource = cfmachportcreaterunloopsource(                     kcfallocatordefault, eventtap, 0);  // add current run loop. cfrunloopaddsource(cfrunloopgetcurrent(), runloopsource,                    kcfrunloopcommonmodes);  // enable event tap. cgeventtapenable(eventtap, true); 

then in class, can implement call function called mycgeventcallback this

    cgeventref mycgeventcallback(cgeventtapproxy proxy, cgeventtype type,               cgeventref event, void *refcon)     { // paranoid sanity check. // type key down or key up, can discard command + q setting     kecode -1    if (((type == kcgeventkeydown) || (type == kcgeventkeyup))) {     cgeventsetintegervaluefield(                                 event, kcgkeyboardeventkeycode, (int64_t)-1);     return event; }  // incoming keycode. cgkeycode keycode = (cgkeycode)cgeventgetintegervaluefield(                                    event, kcgkeyboardeventkeycode);  // swap 'a' (keycode=0) , 'z' (keycode=6). if (keycode == (cgkeycode)0)     keycode = (cgkeycode)6; else if (keycode == (cgkeycode)6)     keycode = (cgkeycode)0;  // set modified keycode field in event. cgeventsetintegervaluefield(     event, kcgkeyboardeventkeycode, (int64_t)keycode);  // must return event useful. return event; } 

for original code check here

thanks