| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "win32/base/win32_window_util.h" |
| |
| #define _ATL_NO_AUTOMATIC_NAMESPACE |
| #define _WTL_NO_AUTOMATIC_NAMESPACE |
| #define _ATL_NO_HOSTING |
| #include <atlbase.h> |
| #include <atlapp.h> |
| #include <atlwin.h> |
| #include <atlstr.h> |
| |
| #include <memory> |
| |
| #include "base/logging.h" |
| #include "base/port.h" |
| #include "base/win_util.h" |
| |
| namespace mozc { |
| namespace win32 { |
| namespace { |
| |
| using ATL::CWindow; |
| using ATL::CStringW; |
| using std::unique_ptr; |
| |
| wstring SafeGetWindowText(HWND window_handle) { |
| if (!::IsWindow(window_handle)) { |
| return wstring(); |
| } |
| |
| const int text_len_without_null = GetWindowTextLength(window_handle); |
| if (text_len_without_null <= 0) { |
| return wstring(); |
| } |
| |
| const size_t buffer_len = text_len_without_null + 1; |
| unique_ptr<wchar_t[]> buffer(new wchar_t[buffer_len]); |
| |
| const int copied_len_without_null = GetWindowText( |
| window_handle, buffer.get(), buffer_len); |
| |
| if (copied_len_without_null <= 0) { |
| return wstring(); |
| } |
| |
| return wstring(buffer.get(), copied_len_without_null); |
| } |
| |
| } // namespace |
| |
| wstring WindowUtil::GetWindowClassName(HWND window_handle) { |
| // Maximum length of WindowClass is assumed to be 256. |
| // http://msdn.microsoft.com/en-us/library/ms633576.aspx |
| wchar_t buffer[256 + 1] = {}; |
| const size_t num_copied_without_null = ::GetClassNameW( |
| window_handle, buffer, arraysize(buffer)); |
| if (num_copied_without_null + 1 >= arraysize(buffer)) { |
| return L""; |
| } |
| return wstring(buffer, num_copied_without_null); |
| } |
| |
| // static |
| bool WindowUtil::ChangeMessageFilter(HWND window_handle, UINT message) { |
| typedef BOOL (WINAPI *FPChangeWindowMessageFilter)(UINT, DWORD); |
| typedef BOOL (WINAPI *FPChangeWindowMessageFilterEx)( |
| HWND, UINT, DWORD, LPVOID); |
| |
| // Following constants are not available unless we change the WINVER |
| // higher enough. |
| const int kMessageFilterAdd = 1; // MSGFLT_ADD (WINVER >=0x0600) |
| const int kMessageFilterAllow = 1; // MSGFLT_ALLOW (WINVER >=0x0601) |
| |
| const HMODULE lib = WinUtil::GetSystemModuleHandle(L"user32.dll"); |
| if (lib == nullptr) { |
| LOG(ERROR) << L"GetModuleHandle for user32.dll failed."; |
| return false; |
| } |
| |
| // Windows 7+ |
| // http://msdn.microsoft.com/en-us/library/dd388202.aspx |
| FPChangeWindowMessageFilterEx change_window_message_filter_ex |
| = reinterpret_cast<FPChangeWindowMessageFilterEx>( |
| ::GetProcAddress(lib, "ChangeWindowMessageFilterEx")); |
| if (change_window_message_filter_ex != nullptr) { |
| // Windows 7+ only |
| if (!(*change_window_message_filter_ex)( |
| window_handle, message, kMessageFilterAllow, nullptr)) { |
| // Note: this actually fails in Internet Explorer 10 on Windows 8 |
| // with ERROR_ACCESS_DENIED (0x5). |
| const int error = ::GetLastError(); |
| VLOG(1) << L"ChangeWindowMessageFilterEx failed. error = " << error; |
| return false; |
| } |
| return true; |
| } |
| |
| // Windows Vista |
| if (!::ChangeWindowMessageFilter(message, kMessageFilterAdd)) { |
| const int error = ::GetLastError(); |
| LOG(ERROR) << L"ChangeWindowMessageFilter failed. error = " << error; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| } // namespace win32 |
| } // namespace mozc |