// Copyright (c) 2012 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 "base/win/wrapped_window_proc.h" #include "base/atomicops.h" #include "base/check.h" #include "base/notreached.h" #include "base/strings/string_util.h" namespace { base::win::WinProcExceptionFilter s_exception_filter = nullptr; HMODULE GetModuleFromWndProc(WNDPROC window_proc) { HMODULE instance = nullptr; // Converting a pointer-to-function to a void* is undefined behavior, but // Windows (and POSIX) APIs require it to work. void* address = reinterpret_cast(window_proc); if (!::GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, static_cast(address), &instance)) { NOTREACHED(); } return instance; } } // namespace. namespace base { namespace win { WinProcExceptionFilter SetWinProcExceptionFilter( WinProcExceptionFilter filter) { subtle::AtomicWord rv = subtle::NoBarrier_AtomicExchange( reinterpret_cast(&s_exception_filter), reinterpret_cast(filter)); return reinterpret_cast(rv); } int CallExceptionFilter(EXCEPTION_POINTERS* info) { return s_exception_filter ? s_exception_filter(info) : EXCEPTION_CONTINUE_SEARCH; } BASE_EXPORT void InitializeWindowClass(const wchar_t* class_name, WNDPROC window_proc, UINT style, int class_extra, int window_extra, HCURSOR cursor, HBRUSH background, const wchar_t* menu_name, HICON large_icon, HICON small_icon, WNDCLASSEX* class_out) { class_out->cbSize = sizeof(WNDCLASSEX); class_out->style = style; class_out->lpfnWndProc = window_proc; class_out->cbClsExtra = class_extra; class_out->cbWndExtra = window_extra; // RegisterClassEx uses a handle of the module containing the window procedure // to distinguish identically named classes registered in different modules. class_out->hInstance = GetModuleFromWndProc(window_proc); class_out->hIcon = large_icon; class_out->hCursor = cursor; class_out->hbrBackground = background; class_out->lpszMenuName = menu_name; class_out->lpszClassName = class_name; class_out->hIconSm = small_icon; // Check if |window_proc| is valid. DCHECK(class_out->hInstance != nullptr); } } // namespace win } // namespace base