errorinfomacros.h

主要介绍vc++6.0的编程过程

// this code is based in part on the
// ACDUAL MFC\OLE sample application provided with Visual C++ 5.0

/////////////////////////////////////////////////////////////////////
// DECLARE_DUAL_ERRORINFO expands to declare the ISupportErrorInfo
// support class. It works together with DUAL_ERRORINFO_PART and
// IMPLEMENT_DUAL_ERRORINFO defined below.
#define DECLARE_DUAL_ERRORINFO() \
    BEGIN_INTERFACE_PART(SupportErrorInfo, ISupportErrorInfo) \
        STDMETHOD(InterfaceSupportsErrorInfo)(THIS_ REFIID riid); \
    END_INTERFACE_PART(SupportErrorInfo) \

/////////////////////////////////////////////////////////////////////
// DUAL_ERRORINFO_PART adds the appropriate entry to the interface map
// for ISupportErrorInfo, if you used DECLARE_DUAL_ERRORINFO.
#define DUAL_ERRORINFO_PART(objectClass) \
    INTERFACE_PART(objectClass, IID_ISupportErrorInfo, SupportErrorInfo) \

/////////////////////////////////////////////////////////////////////
// IMPLEMENT_DUAL_ERRORINFO expands to an implementation of 
// ISupportErrorInfo which matches the declaration in 
// DECLARE_DUAL_ERRORINFO.
#define IMPLEMENT_DUAL_ERRORINFO(objectClass, riidSource) \
    STDMETHODIMP_(ULONG) objectClass::XSupportErrorInfo::AddRef() \
    { \
        METHOD_PROLOGUE(objectClass, SupportErrorInfo) \
	    return pThis->ExternalAddRef(); \
    } \
    STDMETHODIMP_(ULONG) objectClass::XSupportErrorInfo::Release() \
    { \
	    METHOD_PROLOGUE(objectClass, SupportErrorInfo) \
	    return pThis->ExternalRelease(); \
    } \
    STDMETHODIMP objectClass::XSupportErrorInfo::QueryInterface( \
	    REFIID iid, LPVOID* ppvObj) \
    { \
	    METHOD_PROLOGUE(objectClass, SupportErrorInfo) \
	    return pThis->ExternalQueryInterface(&iid, ppvObj); \
    } \
    STDMETHODIMP objectClass::XSupportErrorInfo::InterfaceSupportsErrorInfo( \
        REFIID iid) \
    { \
        METHOD_PROLOGUE(objectClass, SupportErrorInfo) \
        return (iid == riidSource) ? S_OK : S_FALSE; \
    }