Excel中行列转换为AB1格式（支持列大于676）

CString IndexToString(long nRow,long nCol)
{
    //const int SUM_OF_CHARACTER=26
    CString cstrResult;
    if(nCol<=SUM_OF_CHARACTER)
        cstrResult.Format(L"%c%ld",'A'+(nCol-1)/SUM_OF_CHARACTER,nRow);
    else if(nCol>SUM_OF_CHARACTER&&nCol<SUM_OF_CHARACTER*SUM_OF_CHARACTER+SUM_OF_CHARACTER)
        cstrResult.Format(L"%c%c%ld",'A'+(nCol-1)/SUM_OF_CHARACTER-1,'A'+(nCol-1)%SUM_OF_CHARACTER,nRow);
    else
    {
        int nNum((nCol-1)/SUM_OF_CHARACTER%SUM_OF_CHARACTER);
        if(0==nNum)
            cstrResult.Format(L"%c%c%c%ld",'A'+(nCol-1)/SUM_OF_CHARACTER/SUM_OF_CHARACTER-2,'Z',
                'A'+(nCol-1)%SUM_OF_CHARACTER,nRow);
        else
            cstrResult.Format(L"%c%c%c%ld",'A'+(nCol-1)/SUM_OF_CHARACTER/SUM_OF_CHARACTER-1,'A'+(nCol-1)/SUM_OF_CHARACTER%SUM_OF_CHARACTER-1,
                'A'+(nCol-1)%SUM_OF_CHARACTER,nRow);
    }
    return cstrResult;
}