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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Provides a way to handle exceptions that happen while a WindowProc is | |
| 6 // running. The behavior of exceptions generated inside a WindowProc is OS | |
| 7 // dependent, but it is possible that the OS just ignores the exception and | |
| 8 // continues execution, which leads to unpredictable behavior for Chrome. | |
| 9 | |
| 10 #ifndef BASE_WIN_WRAPPED_WINDOW_PROC_H_ | |
| 11 #define BASE_WIN_WRAPPED_WINDOW_PROC_H_ | |
| 12 | |
| 13 #include <windows.h> | |
| 14 | |
| 15 #include "base/base_export.h" | |
| 16 #include "base/strings/string16.h" | |
| 17 | |
| 18 namespace base { | |
| 19 namespace win { | |
| 20 | |
| 21 // An exception filter for a WindowProc. The return value determines how the | |
| 22 // exception should be handled, following standard SEH rules. However, the | |
| 23 // expected behavior for this function is to not return, instead of returning | |
| 24 // EXCEPTION_EXECUTE_HANDLER or similar, given that in general we are not | |
| 25 // prepared to handle exceptions. | |
| 26 typedef int (__cdecl *WinProcExceptionFilter)(EXCEPTION_POINTERS* info); | |
| 27 | |
| 28 // Sets the filter to deal with exceptions inside a WindowProc. Returns the old | |
| 29 // exception filter, if any. | |
| 30 // This function should be called before any window is created. | |
| 31 BASE_EXPORT WinProcExceptionFilter SetWinProcExceptionFilter( | |
| 32 WinProcExceptionFilter filter); | |
| 33 | |
| 34 // Calls the registered exception filter. | |
| 35 BASE_EXPORT int CallExceptionFilter(EXCEPTION_POINTERS* info); | |
| 36 | |
| 37 // Initializes the WNDCLASSEX structure |*class_out| to be passed to | |
| 38 // RegisterClassEx() making sure that it is associated with the module | |
| 39 // containing the window procedure. | |
| 40 BASE_EXPORT void InitializeWindowClass( | |
| 41 const char16* class_name, | |
| 42 WNDPROC window_proc, | |
| 43 UINT style, | |
| 44 int class_extra, | |
| 45 int window_extra, | |
| 46 HCURSOR cursor, | |
| 47 HBRUSH background, | |
| 48 const char16* menu_name, | |
| 49 HICON large_icon, | |
| 50 HICON small_icon, | |
| 51 WNDCLASSEX* class_out); | |
| 52 | |
| 53 // Wrapper that supplies a standard exception frame for the provided WindowProc. | |
| 54 // The normal usage is something like this: | |
| 55 // | |
| 56 // LRESULT CALLBACK MyWinProc(HWND hwnd, UINT message, | |
| 57 // WPARAM wparam, LPARAM lparam) { | |
| 58 // // Do Something. | |
| 59 // } | |
| 60 // | |
| 61 // ... | |
| 62 // | |
| 63 // WNDCLASSEX wc = {0}; | |
| 64 // wc.lpfnWndProc = WrappedWindowProc<MyWinProc>; | |
| 65 // wc.lpszClassName = class_name; | |
| 66 // ... | |
| 67 // RegisterClassEx(&wc); | |
| 68 // | |
| 69 // CreateWindowW(class_name, window_name, ... | |
| 70 // | |
| 71 template <WNDPROC proc> | |
| 72 LRESULT CALLBACK WrappedWindowProc(HWND hwnd, UINT message, | |
| 73 WPARAM wparam, LPARAM lparam) { | |
| 74 LRESULT rv = 0; | |
| 75 __try { | |
| 76 rv = proc(hwnd, message, wparam, lparam); | |
| 77 } __except(CallExceptionFilter(GetExceptionInformation())) { | |
| 78 } | |
| 79 return rv; | |
| 80 } | |
| 81 | |
| 82 } // namespace win | |
| 83 } // namespace base | |
| 84 | |
| 85 #endif // BASE_WIN_WRAPPED_WINDOW_PROC_H_ | |
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Chromium Code Reviews
Issue 1446363003:
Deleted OS_WIN and all Windows specific files from base. (Closed)
Base URL: https://github.com/domokit/mojo.git@base_tests