reads relevant keypress and keycode information

c_src/main.c

@@ -1,165 +1,83 @@
-// https://opensource.apple.com/source/IOHIDFamily/IOHIDFamily-503.1.13/tools/IOHIDReportTest.c.auto.html
-
-#include <CoreFoundation/CoreFoundation.h>
 #include <IOKit/hid/IOHIDLib.h>
-#include <IOKit/hid/IOHIDManager.h>
 #include <IOKit/IOKitLib.h>
+#include <float.h>
 
-static bool gReport = FALSE;
-static bool gValue = TRUE;
-static bool gSend = TRUE;
-
-static char * getReportTypeString(IOHIDReportType type)
-{
- switch ( type ) {
- case kIOHIDReportTypeInput:
- return "INPUT";
- case kIOHIDReportTypeOutput:
- return "OUTPUT";
- case kIOHIDReportTypeFeature:
- return "FEATURE";
- default:
- return "DUH";
- }
-}
-
-static void __deviceReportCallback(void * context, IOReturn result, void * sender, IOHIDReportType type, uint32_t reportID, uint8_t * report, CFIndex reportLength)
-{
- int index;
-
- printf("IOHIDDeviceRef[%p]: reportType=%s reportID=%d reportLength=%ld: ", sender, getReportTypeString(type), reportID, reportLength);
- for (index=0; index<reportLength; index++)
- printf("%02x ", report[index]);
- printf("\n");
-
- // toggle a report
- if ( gSend ) {
- static uint8_t value = 0;
- IOReturn ret = IOHIDDeviceSetReport((IOHIDDeviceRef)sender, kIOHIDReportTypeOutput, 0, &(value), 1);
- value = value+1 % 2;
- printf("Attempt to send data byte. Ret = %d\n", ret); 
- }
-}
-
-void __deviceValueCallback (void * context, IOReturn result, void * sender, IOHIDValueRef value)
-{
- IOHIDElementRef element = IOHIDValueGetElement(value);
-
- if(IOHIDElementGetUsage(element) == 0xFFFFFFFF ||
- IOHIDElementGetCookie(element) == 30) return;
- printf("IOHIDDeviceRef[%p]: value=%p timestamp=%lld cookie=%d usagePage=0x%02X usage=0x%02X intValue=%ld\n", sender, value, IOHIDValueGetTimeStamp(value), (uint32_t)IOHIDElementGetCookie(element), IOHIDElementGetUsagePage(element), IOHIDElementGetUsage(element), IOHIDValueGetIntegerValue(value));
-}
+IOHIDQueueRef queue;
 
+struct KeyEvent {
+ uint8_t type; // 0 is press, 1 is release
+ uint32_t keycode;
+};
 
-static void __deviceCallback(void * context, IOReturn result, void * sender, IOHIDDeviceRef device)
-{ 
- printf("IOHIDDeviceRef[%p] %s\n", device, context!=0 ? "matched" : "terminated");
+void send_key(struct KeyEvent *e) {
+ printf("%u %u\n", e->type, e->keycode);
 }
 
-int main (int argc, const char * argv[]) {
-
- IOHIDManagerRef manager = IOHIDManagerCreate(kCFAllocatorDefault, 0);
- int a;
- for (a=1; a<argc; a++) {
- if ( 0 == strcmp("-v", argv[a]) ) {
- gValue = TRUE;
- printf("Print values supported\n");
- }
- else if ( 0 == strcmp("-s", argv[a]) ) {
- gSend = TRUE;
- printf("Send response out data supported\n");
- }
- else if ( 0 == strcmp("-nr", argv[a]) ) {
- gReport = FALSE;
- printf("Input report data suppressed\n");
+void wait_key(struct KeyEvent *e) {
+ while(1) {
+ // The following call doesn't block, even though the docs say it should:
+ // https://developer.apple.com/documentation/iokit/1545832-iohidqueuecopynextvaluewithtimeo
+ IOHIDValueRef value = IOHIDQueueCopyNextValueWithTimeout(queue,DBL_MAX);
+ if(value) {
+ CFIndex integer_value = IOHIDValueGetIntegerValue(value);
+ IOHIDElementRef element = IOHIDValueGetElement(value);
+ uint32_t usage_page = IOHIDElementGetUsagePage(element);
+ uint32_t usage = IOHIDElementGetUsage(element);
+ if((usage_page == kHIDPage_KeyboardOrKeypad &&
+ kHIDUsage_KeyboardErrorUndefined < usage &&
+ usage < kHIDUsage_Keyboard_Reserved) ||
+ (usage_page == 0xff)) { // See AppleHIDUsageTables.h
+ e->type = !integer_value;
+ e->keycode = usage;
+ return;
+ }
  }
  }
-
+}
+
+int grab_kb() {
  CFMutableDictionaryRef matching_dictionary = IOServiceMatching(kIOHIDDeviceKey);
  UInt32 value;
  CFNumberRef cfValue;
  value = kHIDPage_GenericDesktop;
  cfValue = CFNumberCreate( kCFAllocatorDefault, kCFNumberSInt32Type, &value );
- CFDictionarySetValue(matching_dictionary,
- CFSTR(kIOHIDDeviceUsagePageKey),
- cfValue);
+ CFDictionarySetValue(matching_dictionary, CFSTR(kIOHIDDeviceUsagePageKey), cfValue);
  CFRelease(cfValue);
  value = kHIDUsage_GD_Keyboard;
  cfValue = CFNumberCreate( kCFAllocatorDefault, kCFNumberSInt32Type, &value );
- CFDictionarySetValue(matching_dictionary,
- CFSTR(kIOHIDDeviceUsageKey),
- cfValue);
+ CFDictionarySetValue(matching_dictionary,CFSTR(kIOHIDDeviceUsageKey),cfValue);
  CFRelease(cfValue);
-
-
-
- //IOHIDDeviceRef device = IOHIDDeviceCreate(kCFAllocatorDefault, service);
-
- /*
- io_iterator_t it = IO_OBJECT_NULL;
- kern_return_t r = IOServiceGetMatchingServices(kIOMasterPortDefault,
- matching_dictionary,
- &it);
- printf("%d\n",r);
- 
- //uint64_t id;
- //r = IORegistryEntryGetRegistryEntryID(it, &id);
- 
- // Increment `it' with IOIteratorNext
- */
- io_service_t service = 0;
- IOHIDDeviceRef device = 0;
- service = IOServiceGetMatchingService(kIOMasterPortDefault,
- matching_dictionary);
- device = IOHIDDeviceCreate(kCFAllocatorDefault, service); 
- IOReturn ret = IOHIDDeviceOpen(device,kIOHIDOptionsTypeNone);
- printf("%x\n",ret);
-
- //IOHIDDeviceGetProperty();
- io_name_t devName;
- IORegistryEntryGetName(service, devName);
- printf("Device's name = %s\n", devName);
- IOHIDQueueRef queue = IOHIDQueueCreate(kCFAllocatorDefault,
- device,
- 32,
- kIOHIDOptionsTypeNone);
+ io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault,
+ matching_dictionary);
+ IOHIDDeviceRef device = IOHIDDeviceCreate(kCFAllocatorDefault, service);
+ // grab_kb Works without actually opening the device,
+ // but I'm not sure if that's guaranteed
+ // IOReturn ret = IOHIDDeviceOpen(device,kIOHIDOptionsTypeNone);
+ // printf("%x\n",ret);
+ queue = IOHIDQueueCreate(kCFAllocatorDefault, device, 32, kIOHIDOptionsTypeNone);
  CFArrayRef elements = IOHIDDeviceCopyMatchingElements(device,
  NULL,
  kIOHIDOptionsTypeNone);
 
- printf("%ld\n",CFArrayGetCount(elements));
  for (CFIndex i = 0; i < CFArrayGetCount(elements); ++i) {
  IOHIDQueueAddElement(queue,
  (IOHIDElementRef)CFArrayGetValueAtIndex(elements, i));
  }
  CFRelease(elements);
-
  IOHIDQueueStart(queue);
- while(1) {
- IOHIDValueRef value = IOHIDQueueCopyNextValue(queue);
- if(value)
- printf("%p\n",value);
- }
-
- /*
- IOHIDManagerSetDeviceMatching(manager,matching_dictionary);
- 
- // CFRelease(matching_dictionary);
+ return 0;
+}
 
- IOHIDManagerRegisterDeviceMatchingCallback(manager, __deviceCallback, (void*)TRUE);
- IOHIDManagerRegisterDeviceRemovalCallback(manager, __deviceCallback, (void*)FALSE);
- 
- if ( gReport )
- IOHIDManagerRegisterInputReportCallback(manager, __deviceReportCallback, NULL);
- if ( gValue ) 
- IOHIDManagerRegisterInputValueCallback(manager, __deviceValueCallback, NULL);
- 
- IOHIDManagerScheduleWithRunLoop(manager, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
- // IOHIDManagerSetDeviceMatching(manager, NULL);
- IOHIDManagerOpen(manager, 0);
- 
- CFRunLoopRun();
- 
+int release_kb() {
+ IOHIDQueueStop(queue);
  return 0;
- */
 }
+
+int main() {
+ grab_kb();
+ struct KeyEvent ke;
+ while(1) {
+ wait_key(&ke);
+ send_key(&ke);
+ }
+}