132 lines
2.6 KiB
C++
132 lines
2.6 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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ThreeDJungleTrain.cpp
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Abstract:
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ThreedJungleTrain created a new DirectSound object every time
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it entered the "3D Train Ride" part of the game, and destroyed
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the object every time it went to a "2D interior" part. It was
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keeping and using an old pointer to the first DirectSound object
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it ever created even after it was destroyed. It was only luck that
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Win9x would continue to allocate new objects in the same place that
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allowed the game to work. This shim never allows the release of
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that first object and then continues to hand back pointers to the
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first object when new objects are requested so that the old pointer
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the app uses always points to a (the) valid DirectSound object.
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History:
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08/09/2000 t-adams Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(ThreeDJungleTrain)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(DirectSoundCreate)
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APIHOOK_ENUM_END
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// Pointer to the first DirectSound object created.
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LPDIRECTSOUND g_pDS = NULL;
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/*++
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Hook DirectSoundCreate to remeber the first DS object created and afterwards
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return a pointer to that object when new DS objects are requested.
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--*/
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HRESULT
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APIHOOK(DirectSoundCreate)(
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LPCGUID lpcGuid,
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LPDIRECTSOUND *ppDS,
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LPUNKNOWN pUnkOuter)
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{
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HRESULT hRet = DS_OK;
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// Check to see if we have an old DS yet.
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if( NULL == g_pDS ) {
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// If not, then get a new DS
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hRet = ORIGINAL_API(DirectSoundCreate)(lpcGuid, ppDS, pUnkOuter);
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if ( DS_OK == hRet )
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{
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HookObject(
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NULL,
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IID_IDirectSound,
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(PVOID*)ppDS,
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NULL,
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FALSE);
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g_pDS = *ppDS;
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}
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goto exit;
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} else {
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// If so, then give back the old DS
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*ppDS = g_pDS;
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goto exit;
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}
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exit:
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return hRet;
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}
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/*++
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Hook IDirectSound_Release so DirectSound object isn't released.
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--*/
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HRESULT
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COMHOOK(IDirectSound, Release)(
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PVOID pThis)
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{
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// Don't release.
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return 0;
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}
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/*++
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Release global DirectSound object.
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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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if (fdwReason == DLL_PROCESS_DETACH) {
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if (NULL != g_pDS) {
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ORIGINAL_COM(IDirectSound, Release, g_pDS)(g_pDS);
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}
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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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APIHOOK_ENTRY(DSOUND.DLL, DirectSoundCreate)
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COMHOOK_ENTRY(DirectSound, IDirectSound, Release, 2)
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CALL_NOTIFY_FUNCTION
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HOOK_END
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IMPLEMENT_SHIM_END
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