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#ifndef COMHelper_h
#define COMHelper_h
#pragma warning( push)
#pragma warning( disable: 4786)
#pragma warning( disable: 4290)
#include <new>
#include <typeinfo>
#include <comdef.h>
#include <comip.h>
namespace COMUtility
{
// simple template to reduce the typing effort when doing reinterpret<void**> casts
template< typename Interface>
inline void** ppvoid( Interface **ppInterface)
{
return reinterpret_cast< void**>( ppInterface);
}
template< typename Interface>
inline GUID* piid( const Interface* pInterface)
{
return __uuidof( pInterface);
}
// to be used with _com_ptr_t, uses function overloading
template< typename InterfacePtr>
inline GUID* piid( const InterfacePtr& pInterface)
{
return const_cast< GUID*>( &pInterface.GetIID());
}
template< typename Interface>
inline const GUID& riid( const Interface* pInterface)
{
return *__uuidof( pInterface);
}
// to be used with _com_ptr_t, use function overloading
template< typename InterfacePtr>
inline const GUID& riid( const InterfacePtr& pInterface)
{
return pInterface.GetIID();
}
// this is used for regular COM interface pointers
template < class rawTargetInterface, class rawSourceInterface>
inline rawTargetInterface* interface_cast( rawSourceInterface* pSrcInterface) throw( std::bad_cast)
{
rawTargetInterface* pTargetInterface = NULL;
if ( SUCCEEDED( pSrcInterface->QueryInterface( __uuidof( pTargetInterface),
reinterpret_cast<void**>(&pTargetInterface))))
return pTargetInterface;
else
throw std::bad_cast();
}
// non-throwing versions of the same - need to use parameter std::nothrow on function call
template < class rawTargetInterface, class rawSourceInterface>
inline rawTargetInterface* interface_cast( const std::nothrow_t&,
rawSourceInterface* pSrcInterface) throw()
{
rawTargetInterface* pTargetInterface = NULL;
pSrcInterface->QueryInterface( __uuidof( pTargetInterface),
reinterpret_cast<void**>(&pTargetInterface));
return pTargetInterface;
}
// Is probably best used as a static member of the class, so it's
// accessible everywhere
class COMExceptionThrower
{
public:
COMExceptionThrower( void){}
~COMExceptionThrower( void){}
COMExceptionThrower( const HRESULT errCode)
{
this->operator=( errCode);
}
protected:
// don't allow regular copy constructor call
COMExceptionThrower( const COMExceptionThrower&);
public:
inline const COMExceptionThrower& operator=( const HRESULT errCode) const throw( _com_error)
{
if ( FAILED( errCode))
_com_raise_error( errCode);
return *this;
}
};
} // end namespace COMUtility
#pragma warning( pop)
#endif // COMHelper_h
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