55 lines
2.8 KiB
C
55 lines
2.8 KiB
C
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// Copyright (c) 1999 Microsoft Corporation. All rights reserved.
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//
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// Helper routines that wrap called to functions in oleaut32. This enables us to
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// compile free from any dependency on oleaut32.dll. Each function takes a bool as
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// its first argument, which is true if the oleaut32 function is to be called. When
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// false, our own implementation of the function is used. In this case, some
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// functionality is lost. For example, only certain types of VARIANT variables are
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// handled correctly in the abscence of oleaut32.
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//
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// oleaut32 is demand-loaded when the first function is called with a true parameter,
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// unless one of the following is defined:
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// DMS_ALWAYS_USE_OLEAUT
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// causes oleaut32 to be used in all cases and statically linked.
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// DMS_NEVER_USE_OLEAUT
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// for use on platforms where oleaut32 isn't available -- always uses the
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// internal functions and asserts if true is ever passed.
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//
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#pragma once
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// If this GUID is passed for riid when calling Invoke, the DirectMusic automation methods will behave according to a special
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// calling convention whereby the functions in this file are used (with fUseOleAut as false) instead of those from
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// oleaut32.
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const GUID g_guidInvokeWithoutOleaut = { 0x1fcc43db, 0xbad8, 0x4a88, { 0xbc, 0x77, 0x4e, 0x1a, 0xe0, 0x2d, 0x9c, 0x79 } };
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#ifdef DMS_ALWAYS_USE_OLEAUT
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// VARIANTs
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inline void DMS_VariantInit(bool fUseOleAut, VARIANTARG *pvarg) { VariantInit(pvarg); }
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inline HRESULT DMS_VariantClear(bool fUseOleAut, VARIANTARG *pvarg) { return VariantClear(pvarg); }
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inline HRESULT DMS_VariantCopy(bool fUseOleAut, VARIANTARG *pvargDest, const VARIANTARG *pvargSrc) { return VariantCopy(pvargDest, const_cast<VARIANT*>(pvargSrc)); }
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inline HRESULT DMS_VariantChangeType(bool fUseOleAut, VARIANTARG *pvargDest, VARIANTARG *pvarSrc, USHORT wFlags, VARTYPE vt) { return VariantChangeType(pvargDest, pvarSrc, wFlags, vt); }
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// BSTRs
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inline BSTR DMS_SysAllocString(bool fUseOleAut, const OLECHAR *pwsz) { return SysAllocString(pwsz); }
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inline void DMS_SysFreeString(bool fUseOleAut, BSTR bstr) { SysFreeString(bstr); }
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#else
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// VARIANTs
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// Without fUseOleAut, Only handles types VT_I4, VT_I2, VT_UNKNOWN, VT_DISPATCH and
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// doesn't call dispatch pointers for their value properties.
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void DMS_VariantInit(bool fUseOleAut, VARIANTARG *pvarg);
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HRESULT DMS_VariantClear(bool fUseOleAut, VARIANTARG * pvarg);
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HRESULT DMS_VariantCopy(bool fUseOleAut, VARIANTARG * pvargDest, const VARIANTARG * pvargSrc);
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HRESULT DMS_VariantChangeType(bool fUseOleAut, VARIANTARG * pvargDest, VARIANTARG * pvarSrc, USHORT wFlags, VARTYPE vt);
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// BSTRs
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// Without fUseOleAut, doesn't include size prefix -- plain C WCHAR strings.
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BSTR DMS_SysAllocString(bool fUseOleAut, const OLECHAR *pwsz);
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void DMS_SysFreeString(bool fUseOleAut, BSTR bstr);
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#endif
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