C / C++ / MFC

CString CXLAutomation::GetCellValueCString(int nColumn, int nRow)
{
	CString szValue =_T("");
	if(NULL == m_pdispWorksheet)return szValue;

	VARIANTARG vargRng, vargValue;
	ClearAllArgs();
	AddArgumentDouble(NULL, 0, nColumn);
	AddArgumentDouble(NULL, 0, nRow);
	if(! ExlInvoke(m_pdispWorksheet, L"Cells",&vargRng, DISPATCH_PROPERTYGET, DISP_FREEARGS))return szValue;

	if(! ExlInvoke(vargRng.pdispVal, L"Value", &vargValue, DISPATCH_PROPERTYGET, 0))return szValue;

	VARTYPE Type = vargValue.vt;
	switch(Type)
	{
	case VT_UI1:
		{
			TCHAR nChr = vargValue.bVal;
			szValue = nChr;
		}
		break;
	case VT_I4:
		{
			long nVal = vargValue.lVal;
			szValue.Format("%i", nVal);
		}
		break;
	case VT_R4:
		{
			float fVal = vargValue.fltVal;
			szValue.Format("%f", fVal);
		}
		break;
	case VT_R8:
		{
			double dVal = vargValue.dblVal;
			szValue.Format("%f", dVal);
		}
		break;
	case VT_BSTR:
		{
			BSTR b = vargValue.bstrVal;
			szValue = b;
		}
		break;
	case VT_BYREF|VT_UI1:
		{
			//Not tested
			unsigned char* pChr = vargValue.pbVal;
			szValue = (TCHAR)*pChr;
		}
		break;
	case VT_BYREF|VT_BSTR:
		{
			//Not tested
			BSTR* pb = vargValue.pbstrVal;
			szValue = *pb;
		}
		break;
	case 0:
		{
			//Empty
			szValue = _T("");
		}
		break;
	}
//	ReleaseVariant(&vargRng);
//	ReleaseVariant(&vargValue);

	return szValue;
}

//Header File A.h
#ifndef _A_H 
#define _A_H
class TEST
{
 int num;
void fun();
}

//CPP file A.cpp
/*In this class I want to create a Pointer of object in some function*/
TEST* _pObj = new TEST();
_pObj->num++;//num already initialize in constructor.

//Another CPP File SAMPLE.cpp dont have any header
I want to access num in this cpp file also
How can I use the same Object in cpp file.
I tried by adding header file. And where do I declare and initialize the TEST class object pointer so that i can use it here