245 lines
5.6 KiB
C++
245 lines
5.6 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1995.
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//
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// File: OAUTDLL.hxx
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//
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// Contents:
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//
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// Classes:
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//
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// Functions:
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//
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// History: 05-15-97 DanpoZ (Danpo Zhang) Created
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//
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//----------------------------------------------------------------------------
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#ifndef OAUTDLL_HXX_
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#define OAUTDLL_HXX_
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//+---------------------------------------------------------------------------
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//
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// Class: COleAutDll
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//
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// Purpose: class wrapper for calling API from delay
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// loaded oleaut32.dll
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//
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// Interface:
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//
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//
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// History: 05-15-97 DanpoZ (Danpo Zhang) Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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class COleAutDll
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{
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public:
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// ctor, dtor
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COleAutDll();
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~COleAutDll();
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// member funcs
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HRESULT Init();
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#define DELAYOLEAUTAPI_HR(_fn, _args, _nargs) \
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HRESULT _fn _args { \
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HRESULT hr = Init(); \
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if (SUCCEEDED(hr)) { \
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hr = _pfn##_fn _nargs; \
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} \
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return hr; } \
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HRESULT (STDAPICALLTYPE* _pfn##_fn) _args;
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#define DELAYOLEAUTAPI_BSTR(_fn, _args, _nargs) \
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BSTR _fn _args { \
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HRESULT hres = Init(); \
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BSTR bstr = NULL; \
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if (SUCCEEDED(hres)) { \
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bstr = _pfn##_fn _nargs; \
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} \
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return bstr; } \
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BSTR (STDAPICALLTYPE* _pfn##_fn) _args;
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#define DELAYOLEAUTAPI_INT(_fn, _args, _nargs) \
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INT _fn _args { \
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HRESULT hres = Init(); \
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INT iRet = FALSE;\
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if (SUCCEEDED(hres)) { \
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iRet = _pfn##_fn _nargs; \
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} \
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return iRet; } \
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INT (STDAPICALLTYPE* _pfn##_fn) _args;
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#define DELAYOLEAUTAPI_UINT(_fn, _args, _nargs) \
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INT _fn _args { \
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HRESULT hres = Init(); \
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UINT iRet ;\
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if (SUCCEEDED(hres)) { \
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iRet = _pfn##_fn _nargs; \
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} \
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return iRet; } \
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UINT (STDAPICALLTYPE* _pfn##_fn) _args;
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#define DELAYOLEAUTAPI_VOID(_fn, _args, _nargs) \
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void _fn _args { \
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HRESULT hres = Init(); \
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if (SUCCEEDED(hres)) { \
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_pfn##_fn _nargs; \
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} \
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} \
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void (STDAPICALLTYPE* _pfn##_fn) _args;
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// APIs
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DELAYOLEAUTAPI_HR( VariantClear,
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(VARIANTARG* pvarg),
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(pvarg)
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)
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DELAYOLEAUTAPI_HR( VariantInit,
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(VARIANTARG* pvarg),
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(pvarg)
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)
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DELAYOLEAUTAPI_HR( VariantCopy,
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(VARIANTARG* pvargDest,
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VARIANTARG* pvargSrc
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),
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(pvargDest, pvargSrc)
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)
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DELAYOLEAUTAPI_HR( VariantChangeType,
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(VARIANTARG* pvargDest,
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VARIANTARG* pvargSrc,
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USHORT wFlags,
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VARTYPE vt
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),
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(pvargDest, pvargSrc, wFlags, vt)
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)
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DELAYOLEAUTAPI_HR( LoadTypeLib,
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(const OLECHAR* szFile,
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ITypeLib** pptlib
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),
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(szFile, pptlib)
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)
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DELAYOLEAUTAPI_BSTR( SysAllocStringByteLen,
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(LPCSTR psz,
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UINT len
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),
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(psz, len )
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)
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DELAYOLEAUTAPI_BSTR( SysAllocString,
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(const OLECHAR* psz),
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(psz)
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)
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DELAYOLEAUTAPI_UINT( SysStringByteLen,
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(BSTR bstr),
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(bstr)
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)
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DELAYOLEAUTAPI_VOID( SysFreeString,
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(BSTR bstr),
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(bstr)
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)
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private:
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BOOL _fInited;
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HMODULE _hMod;
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};
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//+---------------------------------------------------------------------------
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//
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// Method: COleAutDll::COleAutDll
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//
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// Synopsis:
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//
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// History: 05-15-97 DanpoZ (Danpo Zhang) Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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inline
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COleAutDll::COleAutDll()
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{
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_fInited = FALSE;
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_hMod = NULL;
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}
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//+---------------------------------------------------------------------------
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//
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// Method: COleAutDll::~COleAutDll
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//
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// Synopsis:
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//
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// History: 05-15-97 DanpoZ (Danpo Zhang) Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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inline
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COleAutDll::~COleAutDll()
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{
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if( _fInited)
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FreeLibrary(_hMod);
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}
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//+---------------------------------------------------------------------------
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//
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// Method: COleAutDll::Init
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//
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// Synopsis:
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//
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// History: 05-15-97 DanpoZ (Danpo Zhang) Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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inline
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HRESULT COleAutDll::Init()
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{
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HRESULT hr = NOERROR;
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if( !_fInited )
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{
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_hMod = LoadLibrary("oleaut32.dll");
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if( !_hMod )
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hr = HRESULT_FROM_WIN32(GetLastError());
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else
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{
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#define CHECKOAUTAPI(_fn) \
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*(FARPROC*)&(_pfn##_fn) = GetProcAddress(_hMod, #_fn); \
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if( !(_pfn##_fn)) hr = E_UNEXPECTED;
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CHECKOAUTAPI(VariantClear);
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CHECKOAUTAPI(VariantInit);
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CHECKOAUTAPI(VariantCopy);
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CHECKOAUTAPI(VariantChangeType);
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CHECKOAUTAPI(SysAllocStringByteLen);
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CHECKOAUTAPI(SysAllocString);
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CHECKOAUTAPI(SysStringByteLen);
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CHECKOAUTAPI(SysFreeString);
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CHECKOAUTAPI(LoadTypeLib);
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}
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if( hr == NOERROR )
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_fInited = TRUE;
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}
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return hr;
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}
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#endif
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