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| 1 // Copyright (c) 2011 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 // A utility class that makes it easy to register for registry change | |
| 6 // notifications. | |
| 7 // | |
| 8 | |
| 9 #include "chrome_frame/registry_watcher.h" | |
| 10 | |
| 11 #include "chrome_frame/chrome_frame_helper_util.h" | |
| 12 | |
| 13 namespace { | |
| 14 const wchar_t kRegistryWatcherEventName[] = L"chrome_registry_watcher_event"; | |
| 15 } // namespace | |
| 16 | |
| 17 RegistryWatcher::RegistryWatcher(HKEY hive, | |
| 18 const wchar_t* path, | |
| 19 NotifyFunc callback) | |
| 20 : callback_(callback), | |
| 21 wait_event_(NULL), | |
| 22 wait_handle_(NULL), | |
| 23 stopping_(false) { | |
| 24 // Enforce that we can open the given registry path with the KEY_NOTIFY | |
| 25 // permission. | |
| 26 LONG result = RegOpenKeyEx(hive, path, 0, KEY_NOTIFY, ®istry_key_); | |
| 27 if (result != ERROR_SUCCESS) { | |
| 28 registry_key_ = NULL; | |
| 29 } | |
| 30 } | |
| 31 | |
| 32 RegistryWatcher::~RegistryWatcher() { | |
| 33 StopWatching(); | |
| 34 if (registry_key_) { | |
| 35 RegCloseKey(registry_key_); | |
| 36 registry_key_ = NULL; | |
| 37 } | |
| 38 } | |
| 39 | |
| 40 bool RegistryWatcher::StartWatching() { | |
| 41 if (!registry_key_ || wait_event_ || !callback_) { | |
| 42 return false; | |
| 43 } | |
| 44 | |
| 45 bool result = false; | |
| 46 wait_event_ = CreateEvent(NULL, | |
| 47 FALSE, // Auto-resets | |
| 48 FALSE, // Initially non-signalled | |
| 49 kRegistryWatcherEventName); | |
| 50 if (wait_event_ != NULL) { | |
| 51 LONG notify_result = RegNotifyChangeKeyValue( | |
| 52 registry_key_, | |
| 53 TRUE, // Watch subtree | |
| 54 REG_NOTIFY_CHANGE_NAME, // Notifies if a subkey is added. | |
| 55 wait_event_, | |
| 56 TRUE); // Asynchronous, signal the event when a change occurs. | |
| 57 | |
| 58 if (notify_result == ERROR_SUCCESS) { | |
| 59 if (RegisterWaitForSingleObject(&wait_handle_, | |
| 60 wait_event_, | |
| 61 &RegistryWatcher::WaitCallback, | |
| 62 reinterpret_cast<void*>(this), | |
| 63 INFINITE, | |
| 64 WT_EXECUTEDEFAULT)) { | |
| 65 stopping_ = false; | |
| 66 result = true; | |
| 67 } | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 // If we're not good to go we don't need to hold onto the event. | |
| 72 if (!result && wait_event_) { | |
| 73 CloseHandle(wait_event_); | |
| 74 wait_event_ = NULL; | |
| 75 } | |
| 76 | |
| 77 return result; | |
| 78 } | |
| 79 | |
| 80 void RegistryWatcher::StopWatching() { | |
| 81 stopping_ = true; | |
| 82 if (wait_handle_) { | |
| 83 // Unregister the wait and block until any current handlers have returned. | |
| 84 UnregisterWaitEx(wait_handle_, INVALID_HANDLE_VALUE); | |
| 85 wait_handle_ = NULL; | |
| 86 } | |
| 87 if (wait_event_) { | |
| 88 CloseHandle(wait_event_); | |
| 89 wait_event_ = NULL; | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 void CALLBACK RegistryWatcher::WaitCallback(void* param, BOOLEAN wait_fired) { | |
| 94 RegistryWatcher* watcher = reinterpret_cast<RegistryWatcher*>(param); | |
| 95 if (watcher->stopping_) | |
| 96 return; | |
| 97 | |
| 98 if (watcher->callback_) { | |
| 99 watcher->callback_(); | |
| 100 } | |
| 101 } | |
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Chromium Code Reviews
Issue 126143005:
Remove Chrome Frame code and resources. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src