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79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/win/wrapped_window_proc.h"
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#include "base/atomicops.h"
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#include "base/logging.h"
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namespace {
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base::win::WinProcExceptionFilter s_exception_filter = NULL;
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HMODULE GetModuleFromWndProc(WNDPROC window_proc) {
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HMODULE instance = NULL;
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// Converting a pointer-to-function to a void* is undefined behavior, but
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// Windows (and POSIX) APIs require it to work.
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void* address = reinterpret_cast<void*>(window_proc);
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if (!::GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
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GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
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static_cast<char*>(address),
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&instance)) {
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NOTREACHED();
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}
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return instance;
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}
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} // namespace.
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namespace base {
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namespace win {
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WinProcExceptionFilter SetWinProcExceptionFilter(
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WinProcExceptionFilter filter) {
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subtle::AtomicWord rv = subtle::NoBarrier_AtomicExchange(
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reinterpret_cast<subtle::AtomicWord*>(&s_exception_filter),
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reinterpret_cast<subtle::AtomicWord>(filter));
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return reinterpret_cast<WinProcExceptionFilter>(rv);
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}
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int CallExceptionFilter(EXCEPTION_POINTERS* info) {
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return s_exception_filter ? s_exception_filter(info) :
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EXCEPTION_CONTINUE_SEARCH;
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}
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BASE_EXPORT void InitializeWindowClass(
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const char16* class_name,
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WNDPROC window_proc,
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UINT style,
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int class_extra,
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int window_extra,
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HCURSOR cursor,
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HBRUSH background,
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const char16* menu_name,
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HICON large_icon,
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HICON small_icon,
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WNDCLASSEX* class_out) {
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class_out->cbSize = sizeof(WNDCLASSEX);
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class_out->style = style;
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class_out->lpfnWndProc = window_proc;
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class_out->cbClsExtra = class_extra;
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class_out->cbWndExtra = window_extra;
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// RegisterClassEx uses a handle of the module containing the window procedure
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// to distinguish identically named classes registered in different modules.
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class_out->hInstance = GetModuleFromWndProc(window_proc);
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class_out->hIcon = large_icon;
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class_out->hCursor = cursor;
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class_out->hbrBackground = background;
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class_out->lpszMenuName = menu_name;
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class_out->lpszClassName = class_name;
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class_out->hIconSm = small_icon;
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// Check if |window_proc| is valid.
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DCHECK(class_out->hInstance != NULL);
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}
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} // namespace win
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} // namespace base
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