104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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PostIt2.cpp
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Abstract:
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This shim eliminates an infinite loop in 3M's Post-It Notes application
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by preventing the WM_TIMECHANGE message from reaching the Post-It
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Notes windows when the application triggers a time change using
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SetTimeZoneInformation().
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Notes:
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This is an application specific shim.
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History:
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06/04/2001 tonyschr Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(PostIt2)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(SetTimeZoneInformation)
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APIHOOK_ENUM_ENTRY(CallWindowProcA)
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APIHOOK_ENUM_END
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static SYSTEMTIME g_localtime = { 0 };
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BOOL
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APIHOOK(SetTimeZoneInformation)(
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CONST TIME_ZONE_INFORMATION *lpTimeZoneInformation
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)
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{
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BOOL fReturn = ORIGINAL_API(SetTimeZoneInformation)(lpTimeZoneInformation);
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// Store off local time after this application requests timezone change.
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GetLocalTime(&g_localtime);
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return fReturn;
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}
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LRESULT
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APIHOOK(CallWindowProcA)(
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WNDPROC pfn,
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HWND hwnd,
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UINT message,
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WPARAM wParam,
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LPARAM lParam)
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{
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// Detect whether the WM_TIMECHANGE message was triggered by the app calling
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// SetTimeZoneInformation() or an external timechange by comparing the local
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// time.
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if (message == WM_TIMECHANGE)
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{
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SYSTEMTIME newtime;
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GetLocalTime(&newtime);
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if (newtime.wYear == g_localtime.wYear &&
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newtime.wMonth == g_localtime.wMonth &&
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newtime.wDayOfWeek == g_localtime.wDayOfWeek &&
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newtime.wDay == g_localtime.wDay &&
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newtime.wHour == g_localtime.wHour &&
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newtime.wMinute == g_localtime.wMinute &&
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newtime.wSecond == g_localtime.wSecond &&
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newtime.wMilliseconds == g_localtime.wMilliseconds)
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{
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// Looks like this WM_TIMECHANGE was sent in response to the app
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// calling SetTimeZoneInformation(), so block it.
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// Note: Because of the asynchronous nature of window messages this
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// might let an occasional WM_TIMECHANGE slip through, but it should
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// always terminiate the infinite loop.
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return 0;
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}
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}
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return ORIGINAL_API(CallWindowProcA)(pfn, hwnd, message, wParam, lParam);
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(KERNEL32.DLL, SetTimeZoneInformation)
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APIHOOK_ENTRY(USER32.DLL, CallWindowProcA)
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HOOK_END
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IMPLEMENT_SHIM_END
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