143 lines
4.8 KiB
C
143 lines
4.8 KiB
C
/*--------------------------------------------------------------------------*
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*
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* Microsoft Windows
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* Copyright (C) Microsoft Corporation, 1992 - 000
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*
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* File: msaastub.h
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*
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* Contents: Provides stub implementations of OLEACC functions that
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* aren't available on backlevel OS's (Win95, NT4 SP3).
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* These implementations were copied from msaa.h, which
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* is no longer supported.
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*
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* History: 20-Jun-2000 jeffro Created
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*
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*--------------------------------------------------------------------------*/
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#pragma once
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#ifdef __cplusplus
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extern "C" { // Assume C declarations for C++
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#endif // __cplusplus
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// UnDefine these names so we can re-define them below.
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#undef AccessibleObjectFromWindow
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#undef LresultFromObject
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//
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// Define COMPILE_MSAA_STUBS to compile the stubs;
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// otherwise, you get the declarations.
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//
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// Exactly one source must include this with COMPILE_MSAA_STUBS defined.
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//
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#ifdef COMPILE_MSAA_STUBS
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//-----------------------------------------------------------------------------
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//
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// Implement the API stubs.
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//
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//-----------------------------------------------------------------------------
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#ifndef MSAA_FNS_DEFINED
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// OLEACC
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HRESULT (WINAPI* g_pfnAccessibleObjectFromWindow)(HWND,DWORD,REFIID,void **) = NULL;
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LRESULT (WINAPI* g_pfnLresultFromObject)(REFIID,WPARAM,LPUNKNOWN) = NULL;
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// STATUS
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BOOL g_fMSAAInitDone = FALSE;
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#endif
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//-----------------------------------------------------------------------------
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// This is the function that checks that all the required API's exist, and
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// then allows apps that include this file to call the real functions if they
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// exist, or the 'stubs' if they do not. This function is only called by the
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// stub functions - client code never needs to call this.
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//-----------------------------------------------------------------------------
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BOOL InitMSAAStubs(void)
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{
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HMODULE hOleacc;
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if (g_fMSAAInitDone)
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{
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return g_pfnLresultFromObject != NULL;
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}
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hOleacc = GetModuleHandle(TEXT("OLEACC.DLL"));
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if (!hOleacc)
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hOleacc = LoadLibrary(TEXT("OLEACC.DLL"));
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if ((hOleacc) &&
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(*(FARPROC*)&g_pfnAccessibleObjectFromWindow = GetProcAddress(hOleacc,"AccessibleObjectFromWindow")) &&
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(*(FARPROC*)&g_pfnLresultFromObject = GetProcAddress(hOleacc,"LresultFromObject")))
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{
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g_fMSAAInitDone = TRUE;
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return TRUE;
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}
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else
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{
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g_pfnAccessibleObjectFromWindow = NULL;
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g_pfnLresultFromObject = NULL;
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g_fMSAAInitDone = TRUE;
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return FALSE;
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}
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}
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//-----------------------------------------------------------------------------
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//
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// Fake implementations of MSAA APIs that return error codes.
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// No special parameter validation is made since these run in client code
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//
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Fake implementation of AccessibleObjectFromWindow. Returns E_NOTIMPL if the
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// real API is not present.
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//-----------------------------------------------------------------------------
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HRESULT WINAPI xAccessibleObjectFromWindow (HWND hWnd,DWORD dwID,REFIID riidInterface,
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void ** ppvObject)
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{
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if (InitMSAAStubs())
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return g_pfnAccessibleObjectFromWindow (hWnd,dwID,riidInterface,ppvObject);
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return (E_NOTIMPL);
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}
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//-----------------------------------------------------------------------------
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// Fake implementation of LresultFromObject. Returns E_NOTIMPL if the real API
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// is not present.
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//-----------------------------------------------------------------------------
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LRESULT WINAPI xLresultFromObject (REFIID riidInterface,WPARAM wParam,LPUNKNOWN pUnk)
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{
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if (InitMSAAStubs())
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return g_pfnLresultFromObject (riidInterface,wParam,pUnk);
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return (E_NOTIMPL);
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}
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#undef COMPILE_MSAA_STUBS
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#else // COMPILE_MSAA_STUBS
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extern HRESULT WINAPI xAccessibleObjectFromWindow (HWND hWnd,
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DWORD dwID,
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REFIID riidInterface,
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void ** ppvObject);
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extern LRESULT WINAPI xLresultFromObject (REFIID riidInterface,
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WPARAM wParam,
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LPUNKNOWN pUnk);
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#endif // COMPILE_MSAA_STUBS
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//
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// build defines that replace the regular APIs with our versions
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//
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#define AccessibleObjectFromWindow xAccessibleObjectFromWindow
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#define LresultFromObject xLresultFromObject
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#ifdef __cplusplus
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}
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#endif // __cplusplus
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