device/hid/hid_utils_mac.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "device/hid/hid_utils_mac.h"
   6
   7 #include "base/mac/foundation_util.h"
   8 #include "base/strings/sys_string_conversions.h"
   9
  10 namespace device {
  11
  12 int32_t GetHidIntProperty(IOHIDDeviceRef device, CFStringRef key) {
  13   int32_t value;
  14   if (TryGetHidIntProperty(device, key, &value))
  15     return value;
  16   return 0;
  17 }
  18
  19 std::string GetHidStringProperty(IOHIDDeviceRef device, CFStringRef key) {
  20   std::string value;
  21   TryGetHidStringProperty(device, key, &value);
  22   return value;
  23 }
  24
  25 bool TryGetHidIntProperty(IOHIDDeviceRef device,
  26                           CFStringRef key,
  27                           int32_t* result) {
  28   CFNumberRef ref = base::mac::CFCast<CFNumberRef>(
  29       IOHIDDeviceGetProperty(device, key));
  30   return ref && CFNumberGetValue(ref, kCFNumberSInt32Type, result);
  31 }
  32
  33 bool TryGetHidStringProperty(IOHIDDeviceRef device,
  34                              CFStringRef key,
  35                              std::string* result) {
  36   CFStringRef ref = base::mac::CFCast<CFStringRef>(
  37       IOHIDDeviceGetProperty(device, key));
  38   if (!ref) {
  39     return false;
  40   }
  41   *result = base::SysCFStringRefToUTF8(ref);
  42   return true;
  43 }
  44
  45 }  // namespace device