283 lines
12 KiB
C
283 lines
12 KiB
C
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1999
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//
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// File: comerror.h
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//
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// Contents: Support for Rich COM errors
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//
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// History: 14-Oct-99 VivekJ Created
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//
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//--------------------------------------------------------------------------
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#ifndef COMERROR_H
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#define COMERROR_H
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#pragma once
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#include "tiedobj.h"
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//############################################################################
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//############################################################################
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//
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// COM Rich Error support
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//
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//############################################################################
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//############################################################################
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/*+-------------------------------------------------------------------------*
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*
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* MMCReportError
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*
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* PURPOSE: Calls AtlReportError and sets the last error condition based
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* on an SC.
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*
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* PARAMETERS:
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* SC & sc :
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* const IID :
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* const CLSID :
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*
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* RETURNS:
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* inline HRESULT
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*
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*+-------------------------------------------------------------------------*/
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inline
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HRESULT MMCReportError(SC &sc, const IID &iid, const CLSID & clsid)
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{
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// only report the error if there was one.
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if(sc)
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{
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USES_CONVERSION;
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const int length = 256;
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TCHAR sz[length];
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sc.GetErrorMessage(length, sz);
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// set everything we know about the error - the description, the help file,
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// the help ID, and the CLSID and IID of the source.
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return AtlReportError(clsid, sz, sc.GetHelpID(), sc.GetHelpFile(), iid, sc.ToHr());
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}
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else
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return S_OK;
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}
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// see "WHY NAMESPACES ?" comment at the top of mmcerror.h file
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namespace comerror {
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/*+-------------------------------------------------------------------------*
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* class _SC
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*
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*
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* PURPOSE: a local version of the SC class that automatically sets the error
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* information when deleted.
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*
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* NOTE: Because of a compiler bug, this class cannot directly be internal
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* to IMMCSupportErrorInfoImpl<>
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*
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*+-------------------------------------------------------------------------*/
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template<const IID *piid, const CLSID *pclsid>
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class SC : public mmcerror::SC
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{
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typedef mmcerror::SC BaseClass;
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public:
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SC (HRESULT hr = S_OK) : BaseClass(hr)
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{
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}
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~SC()
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{
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MMCReportError(*this, *piid, *pclsid);
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}
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// copy constructor
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SC(const BaseClass &rhs) : BaseClass(rhs)
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{
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}
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// assignment
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SC& operator= (HRESULT hr) { BaseClass::operator =(hr); return *this; }
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SC& operator= (const BaseClass &rhs) { BaseClass::operator =(rhs); return *this; }
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SC& operator= (const SC &rhs) { BaseClass::operator =(rhs); return *this; }
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};
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} // namespace comerror
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/*+-------------------------------------------------------------------------*
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* class IMMCSupportErrorInfoImpl
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*
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*
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* PURPOSE: Inherits from ISupportErrorInfoImpl. local definition of the
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* status code class SC, which makes it easy to return error information
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* via the COM rich error handling system, without any extra effort
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* on the part of the programmer.
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*
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*+-------------------------------------------------------------------------*/
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template<const IID *piid, const CLSID *pclsid>
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class IMMCSupportErrorInfoImpl : public ISupportErrorInfoImpl<piid>
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{
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// this makes sure that AtlReportError is called in the destructor
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public:
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typedef comerror::SC<piid, pclsid> SC;
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};
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#define NYI_COM_METHOD() {SC sc = E_NOTIMPL; return sc.ToHr();}
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/************************************************************************
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* The following macros make it easy to implement a lightweight
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* COM object that "connects" to a non-COM tied object and delegates
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* all its methods to the non-COM object. The tied object pointer
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* is checked as well.
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************************************************************************/
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#define MMC_METHOD_PROLOG() \
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SC sc; \
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\
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CMyTiedObject *pTiedObj = NULL; \
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\
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sc = ScGetTiedObject(pTiedObj); \
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if(sc) \
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return (sc.ToHr())
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#define MMC_METHOD_CALL(_fn) \
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sc = pTiedObj->Sc##_fn
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#define MMC_METHOD_EPILOG() \
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return sc.ToHr()
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#define MMC_METHOD0(_fn) \
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STDMETHOD(_fn)() \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD0_PARAM(_fn, param) \
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STDMETHOD(_fn)() \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(param); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD1(_fn, T1) \
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STDMETHOD(_fn)(T1 p1) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD1_PARAM(_fn, T1, param) \
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STDMETHOD(_fn)(T1 p1) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, param); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD2(_fn, T1, T2) \
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STDMETHOD(_fn)(T1 p1, T2 p2) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, p2); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD2_PARAM(_fn, T1, T2, param) \
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STDMETHOD(_fn)(T1 p1, T2 p2) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, p2, param); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD3(_fn, T1, T2, T3) \
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STDMETHOD(_fn)(T1 p1, T2 p2, T3 p3) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, p2, p3); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD3_PARAM(_fn, T1, T2, T3, param) \
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STDMETHOD(_fn)(T1 p1, T2 p2, T3 p3) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, p2, p3, param); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD4(_fn, T1, T2, T3, T4) \
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STDMETHOD(_fn)(T1 p1, T2 p2, T3 p3, T4 p4) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, p2, p3, p4); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD4_PARAM(_fn, T1, T2, T3, T4, param) \
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STDMETHOD(_fn)(T1 p1, T2 p2, T3 p3, T4 p4) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, p2, p3, p4, param); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD5(_fn, T1, T2, T3, T4, T5) \
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STDMETHOD(_fn)(T1 p1, T2 p2, T3 p3, T4 p4, T5 p5) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, p2, p3, p4, p5); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD5_PARAM(_fn, T1, T2, T3, T4, T5, param) \
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STDMETHOD(_fn)(T1 p1, T2 p2, T3 p3, T4 p4, T5 p5) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_fn)(p1, p2, p3, p4, p5, param); \
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MMC_METHOD_EPILOG(); \
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}
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/************************************************************************
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* A version of the above macros that adds a prefix to the Sc methods.
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* This is useful for disambiguating method names if the same object serves
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* as the tied object for more than one COM object with identical methods.
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************************************************************************/
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#define MMC_METHOD0_EX(_prefix, _fn) \
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STDMETHOD(_fn)() \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_prefix##_fn)(); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD1_EX(_prefix, _fn, T1) \
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STDMETHOD(_fn)(T1 p1) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_prefix##_fn)(p1); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD2_EX(_prefix, _fn, T1, T2) \
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STDMETHOD(_fn)(T1 p1, T2 p2) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_prefix##_fn)(p1, p2); \
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MMC_METHOD_EPILOG(); \
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}
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#define MMC_METHOD3_EX(_prefix, _fn, T1, T2, T3) \
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STDMETHOD(_fn)(T1 p1, T2 p2, T3 p3) \
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{ \
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MMC_METHOD_PROLOG(); \
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MMC_METHOD_CALL(_prefix##_fn)(p1, p2, p3, param); \
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MMC_METHOD_EPILOG(); \
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}
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#endif // COMERROR_H
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