Be Sweet - a set of visual source code browsers

#ifndef ComHelper_H
#define ComHelper_H

#include <string>
#include <sstream>

#include <comdef.h>

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;
	}
};

inline void DebugBox(const std::string &message)
{
  #ifdef DEBUG
    ::MessageBox(NULL, message.c_str(), "BeSweet AddIn", MB_OK | MB_ICONERROR);
  #endif
}

inline std::string asString(const _com_error &e)
{
  std::stringstream ss;
	ss << "Com-Exception \"" << e.ErrorMessage() << "\"" << std::hex << _com_error::WCodeToHRESULT(e.WCode());
  return ss.str();
}

#define HResult HRESULT STDMETHODCALLTYPE

template<class T>
CComPtr<T> new_instance()
{
  typedef CComObject<T> ComObject;
  ComObject *object;
	ComObject::CreateInstance(&object);

  return CComPtr<T>(object);
}

extern COMExceptionThrower cex_;

#endif