95 lines
1.4 KiB
C++
95 lines
1.4 KiB
C++
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/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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IgnoreVBOverflow.cpp
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Abstract:
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Some VB applications don't expect full 32-bit handles from some APIs. VB
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type checking typically throws a "Runtime Error 6" message when
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applications try and store a 32-bit value in a 16-bit variable.
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This fix works with VB5 and VB6 apps.
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Notes:
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This is a general purpose shim.
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History:
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05/21/2001 linstev Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(IgnoreVBOverflow)
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#include "ShimHookMacro.h"
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typedef DWORD (WINAPI *_pfn_VB5_vbaI2I4)();
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typedef DWORD (WINAPI *_pfn_VB6_vbaI2I4)();
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(VB5_vbaI2I4)
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APIHOOK_ENUM_ENTRY(VB6_vbaI2I4)
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APIHOOK_ENUM_END
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/*++
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Zero the return if ecx > 0xFFFF
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--*/
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__declspec(naked)
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VOID
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APIHOOK(VB5_vbaI2I4)()
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{
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__asm {
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test ecx, 0xFFFF0000
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jz Loc1
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xor ecx, ecx
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Loc1:
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mov eax, ecx
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ret
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}
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}
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/*++
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Zero the return if ecx > 0xFFFF
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--*/
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__declspec(naked)
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VOID
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APIHOOK(VB6_vbaI2I4)()
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{
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__asm {
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test ecx, 0xFFFF0000
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jz Loc1
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xor ecx, ecx
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Loc1:
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mov eax, ecx
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ret
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}
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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_NAME(MSVBVM50.DLL, VB5_vbaI2I4, __vbaI2I4)
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APIHOOK_ENTRY_NAME(MSVBVM60.DLL, VB6_vbaI2I4, __vbaI2I4)
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HOOK_END
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IMPLEMENT_SHIM_END
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