138 lines
3.4 KiB
C++
138 lines
3.4 KiB
C++
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/*++
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Copyright (c) 2000-2002 Microsoft Corporation
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Module Name:
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DisableStickyKeys.cpp
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Abstract:
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This shim disables the Sticky Keys Accessibility Option at DLL_PROCESS_ATTACH,
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and re-enables it on termination of the application.
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Some applications, ie. A Bug's Life, have control keys mapped to the shift key. When the
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key is pressed five consecutive times the option is enabled and they are dumped out to the
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desktop to verify that they want to enable the option. In the case of A Bug's Life, the
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application errors and terminates when going to the desktop.
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History:
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05/11/2000 jdoherty Created
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11/06/2000 linstev Removed User32 dependency on InitializeHooks
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04/01/2001 linstev Use SHIM_STATIC_DLLS_INITIALIZED callout
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02/06/2002 mnikkel Added check for malloc and SystemParametersInfo failures.
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(DisableStickyKeys)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_END
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STICKYKEYS g_OldStickyKeyValue;
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BOOL g_bInitialize2 = FALSE;
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/*++
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DisableStickyKeys saves the current value for LPSTICKYKEYS and then disables the option.
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--*/
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VOID
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DisableStickyKeys()
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{
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if (!g_bInitialize2)
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{
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STICKYKEYS NewStickyKeyValue;
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// Initialize the current and new Stickykey structures
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g_OldStickyKeyValue.cbSize = sizeof(STICKYKEYS);
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NewStickyKeyValue.cbSize = sizeof(STICKYKEYS);
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NewStickyKeyValue.dwFlags = 0;
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// retrieve the current Stickykey structure
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if (SystemParametersInfo(SPI_GETSTICKYKEYS, sizeof(STICKYKEYS), &g_OldStickyKeyValue, 0))
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{
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// if retrieval of current Stickykey structure was successful then broadcast the settings
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// with the new structure. This does NOT modify the INI file.
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if (SystemParametersInfo(SPI_SETSTICKYKEYS, sizeof(STICKYKEYS), &NewStickyKeyValue, SPIF_SENDCHANGE))
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{
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g_bInitialize2 = TRUE;
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LOGN( eDbgLevelInfo, "[DisableStickyKeys] Stickykeys disabled.");
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}
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else
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{
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LOGN( eDbgLevelError, "[DisableStickyKeys] Unable to change Stickykey settings!");
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}
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}
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else
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{
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LOGN( eDbgLevelError, "[DisableStickyKeys] Unable to retrieve current Stickykey settings!");
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}
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}
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}
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/*++
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EnableStickyKeys uses the save value for STICKYKEYS and resets the option to the original setting.
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--*/
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VOID
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EnableStickyKeys()
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{
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if (g_bInitialize2)
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{
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g_bInitialize2 = FALSE;
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// Restore Stickykey original state
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if (SystemParametersInfo(SPI_SETSTICKYKEYS, sizeof(STICKYKEYS), &g_OldStickyKeyValue, SPIF_SENDCHANGE))
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{
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LOGN( eDbgLevelInfo, "[DisableStickyKeys] Sticky key state restored");
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}
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else
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{
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LOGN( eDbgLevelError, "[DisableStickyKeys] Unable to restore Sticky key settings!");
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}
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}
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}
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BOOL
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NOTIFY_FUNCTION(
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DWORD fdwReason
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)
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{
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if (fdwReason == SHIM_STATIC_DLLS_INITIALIZED)
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{
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// Turn OFF sticky keys
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DisableStickyKeys();
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} else if (fdwReason == DLL_PROCESS_DETACH)
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{
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// Restore sticky keys
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EnableStickyKeys();
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}
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return TRUE;
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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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CALL_NOTIFY_FUNCTION
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HOOK_END
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IMPLEMENT_SHIM_END
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