本文介绍了如何在MacBook键盘上敲击(挂钩)F7至F12和电源/弹出的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
到目前为止，我可以使用以下方法来点按修饰键和大多数其他键:
So far I am able to tap the modifier keys and most of the other keys using:
_eventTap = CGEventTapCreate( kCGHIDEventTap,
kCGHeadInsertEventTap,
kCGEventTapOptionDefault,
CGEventMaskBit( kCGEventKeyDown )
| CGEventMaskBit( kCGEventFlagsChanged )
,
(CGEventTapCallBack)_tapCallback,
(__bridge void *)(self));
值得注意的是，F3在执行操作之前正确报告了一个键码(160) .也就是说，我可以通过让事件处理程序返回NULL(从而无法传播事件)来禁用该操作.
Notably, F3 correctly reports a keycode (160) before taking action. i.e. I can disable the action by having my event handler return NULL (and thus failing to propagate the event).
但是，F7至F12和Eject/Power不会触发回调.
However, F7 through F12 and Eject/Power don't trigger the callback.
如果我添加:
| CGEventMaskBit( NSSystemDefined )
...现在，其余的Fx键确实触发了回调(尽管Power/Eject仍然没有)，但是我无法访问该事件的keyCode方法.
... Now the remaining Fx keys DO trigger the callback (although Power/Eject still doesn't), but I can't access the keyCode method of the event.
它产生一个错误:
所以:
(1)我需要从NSEvent中提取某些唯一标识符的其他方法，或者
(2)我需要在较低的位置轻击/钩住.
So either:
(1) I need some other way of extracting some unique identifier from NSEvent, or
(2) I need to tap/hook at a lower level.
使用(1)时，我注意到NSEvent具有data1属性.将其以十六进制记录会给出:
Working with (1), I notice NSEvent has a data1 property. Logging this is in hex gives:
2015-05-21 12:40:05.428 tap_k[16576:704298] NSSystemDefined: 140b00
2015-05-21 12:40:06.914 tap_k[16576:704298] NSSystemDefined: 100a00
2015-05-21 12:40:06.992 tap_k[16576:704298] NSSystemDefined: 100b00
2015-05-21 12:40:07.600 tap_k[16576:704298] NSSystemDefined: 130a00
2015-05-21 12:40:07.690 tap_k[16576:704298] NSSystemDefined: 130b00
2015-05-21 12:40:08.219 tap_k[16576:704298] NSSystemDefined: 70a00
2015-05-21 12:40:08.277 tap_k[16576:704298] NSSystemDefined: 70b00
2015-05-21 12:40:09.062 tap_k[16576:704298] NSSystemDefined: 10a00
2015-05-21 12:40:09.186 tap_k[16576:704298] NSSystemDefined: 10b00
2015-05-21 12:40:09.637 tap_k[16576:704298] NSSystemDefined: a00
2015-05-21 12:40:09.726 tap_k[16576:704298] NSSystemDefined: b00
..当我按下/按下F6 F7 F8 F9 F10 F11 F12时.
.. When I keydown/keyup F6 F7 F8 F9 F10 F11 F12.
(同样，最后一个值更改为1表示重复).
(also, the last value changes to a 1 for repeats).
所以我想我可以吃具有这些值的事件，并通过其他NSSystemDefined事件.
So I guess I could just eat events with these values, and pass other NSSystemDefined events through.
它仍然不能解决捕获弹出/力量的问题.
And it still doesn't solve the problem of catching Eject/Power.
但是有没有一种更清洁/更好的方法?
But is there a cleaner/better way?
如果有人有兴趣玩，这里是完整的代码:
If anyone is interested to play around, here is the complete code:
// compile and run from the commandline with:
// clang -fobjc-arc -framework Cocoa ./foo.m -o foo
// sudo ./foo
#import <Foundation/Foundation.h>
#import <AppKit/NSEvent.h>
typedef CFMachPortRef EventTap;
// - - - - - - - - - - - - - - - - - - - - -
@interface KeyChanger : NSObject
{
@private
EventTap _eventTap;
CFRunLoopSourceRef _runLoopSource;
CGEventRef _lastEvent;
}
@end
// - - - - - - - - - - - - - - - - - - - - -
CGEventRef _tapCallback(
CGEventTapProxy proxy,
CGEventType type,
CGEventRef event,
KeyChanger* listener
);
// - - - - - - - - - - - - - - - - - - - - -
@implementation KeyChanger
- (BOOL)tapEvents
{
if (!_eventTap) {
NSLog(@"Initializing an event tap.");
// kCGHeadInsertEventTap -- new event tap should be inserted before any pre-existing event taps at the same location,
_eventTap = CGEventTapCreate( kCGHIDEventTap, // kCGSessionEventTap,
kCGHeadInsertEventTap,
kCGEventTapOptionDefault,
CGEventMaskBit( kCGEventKeyDown )
| CGEventMaskBit( kCGEventFlagsChanged )
| CGEventMaskBit( NSSystemDefined )
,
(CGEventTapCallBack)_tapCallback,
(__bridge void *)(self));
if (!_eventTap) {
NSLog(@"unable to create event tap. must run as root or "
"add privlidges for assistive devices to this app.");
return NO;
}
}
CGEventTapEnable(_eventTap, TRUE);
return [self isTapActive];
}
- (BOOL)isTapActive
{
return CGEventTapIsEnabled(_eventTap);
}
- (void)listen
{
if( ! _runLoopSource ) {
if( _eventTap ) { //dont use [self tapActive]
_runLoopSource = CFMachPortCreateRunLoopSource( kCFAllocatorDefault,
_eventTap, 0);
// Add to the current run loop.
CFRunLoopAddSource( CFRunLoopGetCurrent(), _runLoopSource,
kCFRunLoopCommonModes);
NSLog(@"Registering event tap as run loop source.");
CFRunLoopRun();
}else{
NSLog(@"No Event tap in place! You will need to call "
"listen after tapEvents to get events.");
}
}
}
- (CGEventRef)processEvent:(CGEventRef)cgEvent
{
NSEvent* event = [NSEvent eventWithCGEvent:cgEvent];
NSUInteger modifiers = [event modifierFlags] &
(NSCommandKeyMask | NSAlternateKeyMask | NSShiftKeyMask | NSControlKeyMask);
enum {
kVK_ANSI_3 = 0x14,
};
switch( event.type ) {
case NSFlagsChanged:
NSLog(@"NSFlagsChanged: %d", event.keyCode);
break;
case NSSystemDefined:
NSLog(@"NSSystemDefined: %x", event.data1);
return NULL;
case kCGEventKeyDown:
NSLog(@"KeyDown: %d", event.keyCode);
break;
default:
NSLog(@"WTF");
}
// TODO: add other cases and do proper handling of case
if (
//[event.characters caseInsensitiveCompare:@"3"] == NSOrderedSame
event.keyCode == kVK_ANSI_3
&& modifiers == NSShiftKeyMask
)
{
NSLog(@"Got SHIFT+3");
event = [NSEvent keyEventWithType: event.type
location: NSZeroPoint
modifierFlags: event.modifierFlags & ! NSShiftKeyMask
timestamp: event.timestamp
windowNumber: event.windowNumber
context: event.context
characters: @"#"
charactersIgnoringModifiers: @"#"
isARepeat: event.isARepeat
keyCode: event.keyCode];
}
_lastEvent = [event CGEvent];
CFRetain(_lastEvent); // must retain the event. will be released by the system
return _lastEvent;
}
- (void)dealloc
{
if( _runLoopSource ) {
CFRunLoopRemoveSource( CFRunLoopGetCurrent(), _runLoopSource, kCFRunLoopCommonModes );
CFRelease( _runLoopSource );
}
if( _eventTap ) {
//kill the event tap
CGEventTapEnable( _eventTap, FALSE );
CFRelease( _eventTap );
}
}
@end
// - - - - - - - - - - - - - - - - - - - - -
CGEventRef _tapCallback(
CGEventTapProxy proxy,
CGEventType type,
CGEventRef event,
KeyChanger* listener
)
{
//Do not make the NSEvent here.
//NSEvent will throw an exception if we try to make an event from the tap timout type
@autoreleasepool {
if( type == kCGEventTapDisabledByTimeout ) {
NSLog(@"event tap has timed out, re-enabling tap");
[listener tapEvents];
return nil;
}
if( type != kCGEventTapDisabledByUserInput ) {
return [listener processEvent:event];
}
}
return event;
}
// - - - - - - - - - - - - - - - - - - - - -
int main(int argc, const char * argv[])
{
@autoreleasepool {
KeyChanger* keyChanger = [KeyChanger new];
[keyChanger tapEvents];
[keyChanger listen];//blocking call.
}
return 0;
}
推荐答案
此过程进行了一半.它打印出每个键的扫描代码.确实可以通过在ObjC/ARC中进行重写来整理保留/释放线轴.
This goes halfway. It prints out the scancode for every key. It could really do with being rewritten in ObjC/ARC to tidy up the retain/release bobbins.
有人想去吗?
// compile and run from the commandline with:
// clang -framework coreFoundation -framework IOKit ./HID.c -o hid
// sudo ./hid
// This code works with the IOHID library to get notified of keys.
// Still haven't figured out how to truly intercept with
// substitution.
#include <IOKit/hid/IOHIDValue.h>
#include <IOKit/hid/IOHIDManager.h>
void myHIDKeyboardCallback( void* context, IOReturn result, void* sender, IOHIDValueRef value )
{
IOHIDElementRef elem = IOHIDValueGetElement( value );
if (IOHIDElementGetUsagePage(elem) != 0x07)
return;
uint32_t scancode = IOHIDElementGetUsage( elem );
if (scancode < 4 || scancode > 231)
return;
long pressed = IOHIDValueGetIntegerValue( value );
printf( "scancode: %d, pressed: %ld\n", scancode, pressed );
}
CFMutableDictionaryRef myCreateDeviceMatchingDictionary( UInt32 usagePage, UInt32 usage )
{
CFMutableDictionaryRef dict = CFDictionaryCreateMutable(
kCFAllocatorDefault, 0
, & kCFTypeDictionaryKeyCallBacks
, & kCFTypeDictionaryValueCallBacks );
if ( ! dict )
return NULL;
CFNumberRef pageNumberRef = CFNumberCreate( kCFAllocatorDefault, kCFNumberIntType, & usagePage );
if ( ! pageNumberRef ) {
CFRelease( dict );
return NULL;
}
CFDictionarySetValue( dict, CFSTR(kIOHIDDeviceUsagePageKey), pageNumberRef );
CFRelease( pageNumberRef );
CFNumberRef usageNumberRef = CFNumberCreate( kCFAllocatorDefault, kCFNumberIntType, & usage );
if ( ! usageNumberRef ) {
CFRelease( dict );
return NULL;
}
CFDictionarySetValue( dict, CFSTR(kIOHIDDeviceUsageKey), usageNumberRef );
CFRelease( usageNumberRef );
return dict;
}
int main(void)
{
IOHIDManagerRef hidManager = IOHIDManagerCreate( kCFAllocatorDefault, kIOHIDOptionsTypeNone );
CFArrayRef matches;
{
CFMutableDictionaryRef keyboard = myCreateDeviceMatchingDictionary( 0x01, 6 );
CFMutableDictionaryRef keypad = myCreateDeviceMatchingDictionary( 0x01, 7 );
CFMutableDictionaryRef matchesList[] = { keyboard, keypad };
matches = CFArrayCreate( kCFAllocatorDefault, (const void **)matchesList, 2, NULL );
}
IOHIDManagerSetDeviceMatchingMultiple( hidManager, matches );
IOHIDManagerRegisterInputValueCallback( hidManager, myHIDKeyboardCallback, NULL );
IOHIDManagerScheduleWithRunLoop( hidManager, CFRunLoopGetMain(), kCFRunLoopDefaultMode );
IOHIDManagerOpen( hidManager, kIOHIDOptionsTypeNone );
CFRunLoopRun(); // spins
}
这篇关于如何在MacBook键盘上敲击(挂钩)F7至F12和电源/弹出的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！