如何在OSX中点击/挂接键盘事件并记录每个事件触发哪个键盘 [英] How to tap/hook keyboard events in OSX and record which keyboard fires each event
问题描述
I've now discovered how to hook/tap keyboard events on OS X at a low level: How to tap (hook) F7 through F12 and Power/Eject on a MacBook keyboard
从该答案中打印出代码:
Printing out the code from that answer:
// 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
}
我如何(也许改编代码)来识别哪个键盘负责特定事件?
How can I (maybe adapt that code to) identify which keyboard is responsible for a particular event?
用例是我计划使用将重新映射的外部键盘,但同时保留我内置的MacBook键盘的原始映射.
The use case is that I am planning to use an external keyboard which will be remapped, but at the same time retaining the original mapping for my inbuilt MacBook keyboard.
用于辅助键盘的OSX HID过滤器?
https://github.com/candera/khordr/blob/master/src/c/keygrab/hid-scratch.c
http://ianjoker.googlecode.com/svn/trunk/Joker/小丑/hid_test.cpp
> http://www.cplusplusdevelop.com/72_17345226/
http://www.cocoabuilder.com/archive/cocoa/229902-which-keyboard-barcode-scanner-did-the-event-come-from.html
OSX HID Filter for Secondary Keyboard?
https://github.com/candera/khordr/blob/master/src/c/keygrab/hid-scratch.c
http://ianjoker.googlecode.com/svn/trunk/Joker/Joker/hid_test.cpp
http://www.cplusplusdevelop.com/72_17345226/
http://www.cocoabuilder.com/archive/cocoa/229902-which-keyboard-barcode-scanner-did-the-event-come-from.html
推荐答案
我正在研究此问题,终于得到了解决方案. OP的代码正确,如果您想要键盘/键盘的产品ID,请在myHIDKeyboardCallback()
函数中添加行:
I was working on this problem, and finally got the solution. OP's code is correct, if you'd like the product ID of the keyboard/pad, add lines to the myHIDKeyboardCallback()
function:
void myHIDKeyboardCallback(void* context, IOReturn result, void* sender, IOHIDValueRef value){
IOHIDElementRef elem = IOHIDValueGetElement(value);
if (IOHIDElementGetUsagePage(elem) != 0x07)
return;
IOHIDDeviceRef device = sender;
int32_t pid = 1;
CFNumberGetValue(IOHIDDeviceGetProperty(device, CFSTR("idProduct")), kCFNumberSInt32Type, &pid);
uint32_t scancode = IOHIDElementGetUsage(elem);
if (scancode < 4 || scancode > 231)
return;
long pressed = IOHIDValueGetIntegerValue(value);
printf("scancode: %d, pressed: %ld, keyboardId=%d\n", scancode, pressed, pid);
}
就像@pmdj所说的,您可以使用IOHIDDeviceRegisterInputValueCallback()
一样,我对此感到很麻烦,并且发现sender
参数仍然提供了键盘产品ID.
As @pmdj said you can use IOHIDDeviceRegisterInputValueCallback()
, I was having trouble with this, and found that sender
argument provided keyboard product id anyways.
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