141 lines
2.8 KiB
C++
141 lines
2.8 KiB
C++
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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ForceAnsiWindowProc.cpp
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Abstract:
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Apps call GetWindowLongA() to get a window procedure and subsequently
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does not call CallWindowProc() with the value returned from
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GetWindowLongA(). This SHIM calls GetWindowLongW( ), which returns the
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window procedure.
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If the app wants a Dialog procedure, we pass back our function
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and subsequently call CallWindowProc() in our function. SetWindowLongA()
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is hooked to prevent the app from setting our function as a Dialog Proc.
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Notes:
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This is a general purpose SHIM
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History:
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03/16/2000 prashkud Created
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01/30/2001 prashkud Converted to a general SHIM
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(ForceAnsiWindowProc)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(SetWindowLongA)
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APIHOOK_ENUM_ENTRY(GetWindowLongA)
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APIHOOK_ENUM_END
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#define HANDLE_MASK 0xffff0000
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LONG g_lGetWindowLongRet = 0;
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LRESULT
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MyProcAddress(
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HWND hWnd,
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UINT uMsg,
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WPARAM wParam,
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LPARAM lParam
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)
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{
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return CallWindowProcA(
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(WNDPROC) g_lGetWindowLongRet,
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hWnd,
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uMsg,
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wParam,
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lParam
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);
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}
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LONG
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APIHOOK(SetWindowLongA)(
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HWND hwnd,
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int nIndex,
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LONG dwNewLong
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)
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{
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LONG lRet = 0;
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// If the address that is being set is my address, don't!
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if (dwNewLong == (LONG)MyProcAddress)
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{
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lRet = 0;
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}
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else
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{
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lRet = ORIGINAL_API(SetWindowLongA)(hwnd,nIndex,dwNewLong);
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}
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return lRet;
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}
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/*++
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This function intercepts GetWindowLong( ), checks the nIndex for GWL_WNDPROC
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and if it is,calls GetWindowLongW( ). Otherwise, it calls GetWindowLongA( )
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--*/
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LONG
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APIHOOK(GetWindowLongA)(
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HWND hwnd,
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int nIndex )
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{
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LONG lRet = 0;
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// Apply the modification only if the App wants a WindowProc.
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if ((nIndex == GWL_WNDPROC) ||
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(nIndex == DWL_DLGPROC))
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{
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if ((nIndex == GWL_WNDPROC))
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{
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lRet = GetWindowLongW(hwnd, nIndex);
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}
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else
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{
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g_lGetWindowLongRet = ORIGINAL_API(GetWindowLongA)(
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hwnd,
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nIndex
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);
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if ((g_lGetWindowLongRet & HANDLE_MASK) == HANDLE_MASK)
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{
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lRet = (LONG) MyProcAddress;
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}
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else
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{
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lRet = g_lGetWindowLongRet;
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}
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}
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}
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else
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{
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lRet = ORIGINAL_API(GetWindowLongA)(hwnd, nIndex);
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}
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return lRet;
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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(USER32.DLL, SetWindowLongA)
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APIHOOK_ENTRY(USER32.DLL, GetWindowLongA)
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HOOK_END
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IMPLEMENT_SHIM_END
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