ActiveX-DCOM-ATL

Development Platform:

Visual C++

MyEquation.cpp：Code Content

							// MyEquation.cpp : Implementation of CMyEquation
#include "stdafx.h"
#include "EquationDemo.h"
#include "MyEquation.h"
#include <cmath>
/////////////////////////////////////////////////////////////////////////////
// CMyEquation
STDMETHODIMP CMyEquation::InterfaceSupportsErrorInfo(REFIID riid)
{
	static const IID* arr[] = 
	{
		&IID_IMyEquation
	};
	for (int i=0; i < sizeof(arr) / sizeof(arr[0]); i++)
	{
		if (InlineIsEqualGUID(*arr[i],riid))
			return S_OK;
	}
	return S_FALSE;
}
STDMETHODIMP CMyEquation::solve(Equation* equ,Root** roots)
{
	float delta=(equ->b)*(equ->b)-4*equ->a*equ->c;
	if(delta>=0)
	{
		*roots=(Root*)::CoTaskMemAlloc(sizeof(Root));
		float temp1=sqrt(delta);
		(*roots)->r1=0.5*(0-equ->b+temp1)/equ->a;
		(*roots)->r2=0.5*(0-equ->b-temp1)/equ->a;
		return S_OK;
	}
	else
	{
		this->Error(::SysAllocString(L"no root"));
		return S_FALSE;
	}
}

						