我现在已经发现了如何在 OS X 上低级别挂接/点击键盘事件:如何在 MacBook 键盘上点击(钩住)F7 到 F12 以及电源/弹出
打印出该答案的代码:
// 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(也许可以调整该代码)识别哪个键盘负责特定事件?
用例是,我计划使用将重新映射的外部键盘,但同时保留内置 MacBook 键盘的原始映射。
EDIT:
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/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