iOS6上的IOHIDEventSystemCreate失败了 [英] IOHIDEventSystemCreate on iOS6 failed

问题描述

IOHIDEventSystemCreate总是在iOS6上返回NULL（在iOS5上正常工作）。
任何人都知道为什么？

IOHIDEventSystemCreate always return NULL on iOS6 (work fine on iOS5). Anyone know why?

iPhoneDevWiki上的示例

#include <IOKit/hid/IOHIDEventSystem.h>
#include <stdio.h>

void handle_event (void* target, void* refcon, IOHIDServiceRef service, IOHIDEventRef event) {
  // handle the events here.
  printf("Received event of type %2d from service %p.\n", IOHIDEventGetType(event), service);
}

int main () {
  // Create and open an event system.
  IOHIDEventSystemRef system = IOHIDEventSystemCreate(NULL);
  IOHIDEventSystemOpen(system, handle_event, NULL, NULL, NULL);

  printf("HID Event system should now be running. Hit enter to quit any time.\n");
  getchar();

  IOHIDEventSystemClose(system, NULL);
  CFRelease(system);
  return 0;
}

推荐答案

是的，它没有我也可以在iOS6上工作。
我现在用这个：

Yes, it doesn't work on iOS6 for me too. I now use this:

void *system = IOHIDEventSystemClientCreate(kCFAllocatorDefault);
IOHIDEventSystemClientScheduleWithRunLoop(system, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
IOHIDEventSystemClientRegisterEventCallback(system, handle_event, NULL, NULL);
CFRunLoopRun();

但我不知道为什么它只报告多点触控+键盘事件。
iOS6中的SpringBoard称之为：

But I don't know why it only reports multitouch+keyboard events. SpringBoard in iOS6 calls this:

IOHIDEventSystemClientSetMatchingMultiple(system, array);

包含PrimaryUsagePage + PrimaryUsage的数组，但我无法正常工作...
如果有人知道获得加速度计事件的解决方案，我也很感兴趣。

with an array containing PrimaryUsagePage + PrimaryUsage, but I can't get it working... If someone knows a solution for getting accelerometer events for example, I'm interested too.

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