Add a helper process to Chrome Frame to allow for non-administrative installs...

chrome_frame/event_hooker.cc

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome_frame/event_hooker.h"
+
+#include <crtdbg.h>
+#include "chrome_frame/bho_loader.h"
+
+EXTERN_C IMAGE_DOS_HEADER __ImageBase;
+
+EventHooker::EventHooker()
+: window_creation_hook_(NULL) {}
+
+EventHooker::~EventHooker() {
+  StopHook();
+}
+
+bool EventHooker::StartHook() {
+  if ((NULL != window_creation_hook_)) {
+    return false;
+  }
+
+  window_creation_hook_ = SetWinEventHook(EVENT_OBJECT_CREATE,
+                                          EVENT_OBJECT_CREATE,
+                                          reinterpret_cast<HMODULE>(
+                                              &__ImageBase),
+                                          WindowCreationHookProc,
+                                          0,
+                                          0,
+                                          WINEVENT_INCONTEXT);
+  if (NULL == window_creation_hook_) {
+    return false;
+  }
+  return true;
+}
+
+void EventHooker::StopHook() {
+  if (NULL != window_creation_hook_) {
+    UnhookWinEvent(window_creation_hook_);
+    window_creation_hook_ = NULL;
+  }
+}
+
+VOID CALLBACK EventHooker::WindowCreationHookProc(HWINEVENTHOOK hook,
+                                                  DWORD event,
+                                                  HWND window,
+                                                  LONG object_id,
+                                                  LONG child_id,
+                                                  DWORD event_tid,
+                                                  DWORD event_time) {
+  _ASSERTE((EVENT_OBJECT_CREATE == event) ||
+           (EVENT_OBJECT_PARENTCHANGE == event));
+  if (OBJID_WINDOW == object_id) {
+    BHOLoader::GetInstance()->OnHookEvent(event, window);
+  }
+}
+