Send WM_DEVICECHANGE message through SystemMonitor

content/browser/system_message_window_win.h

+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_
+#define CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_
+#pragma once
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)

[jam, 2011/11/14 18:48:13]

better to include this file only for windows, and then you odn't need this
OS_WIN in the file at all (since it ends in _win after all)

+#include <windows.h>
+#endif  // defined(OS_WIN)
+
+#include "base/basictypes.h"
+#include "content/common/content_export.h"
+
+class CONTENT_EXPORT SystemMessageWindowWin {
+ public:
+  SystemMessageWindowWin();
+  virtual ~SystemMessageWindowWin();
+
+  virtual LRESULT OnDeviceChange(UINT event_type, DWORD data);
+
+ private:
+  LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
+                           WPARAM wparam, LPARAM lparam);
+
+  static LRESULT CALLBACK WndProcThunk(HWND hwnd,
+                                       UINT message,
+                                       WPARAM wparam,
+                                       LPARAM lparam) {
+    SystemMessageWindowWin* msg_wnd = reinterpret_cast<SystemMessageWindowWin*>(
+        GetWindowLongPtr(hwnd, GWLP_USERDATA));
+    if (msg_wnd)
+      return msg_wnd->WndProc(hwnd, message, wparam, lparam);
+    return ::DefWindowProc(hwnd, message, wparam, lparam);
+  }
+
+  HWND window_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemMessageWindowWin);
+};
+
+#endif  // CONTENT_BROWSER_SYSTEM_MESSAGE_WINDOW_WIN_H_