How to import Excel sheet data to List in C++

/* ------------------------------------------------------------------
 * Tutorial 35
 * 
 * This tutorial shows how to import Excel sheet to List in C++.
 * The data is imported from a specific Excel sheet (For this example
 * we use the Excel file generated in Tutorial 09).
 * ------------------------------------------------------------------ */

#include "EasyXLS.h"
#include <conio.h>

int main()
{
    printf("Tutorial 35\n----------\n");

    HRESULT hr;

    // Initialize COM
    hr = CoInitialize(0);

    // Use the SUCCEEDED macro and get a pointer to the interface
    if (SUCCEEDED(hr))
    {
        // Create a pointer to the interface that imports Excel files
        EasyXLS::IExcelDocumentPtr workbook;
        hr = CoCreateInstance(__uuidof(EasyXLS::ExcelDocument),
                              NULL,
                              CLSCTX_ALL,
                              __uuidof(EasyXLS::IExcelDocument),
                              (void**) &workbook) ;

        if (SUCCEEDED(hr)){

            // Import Excel sheet to List
            printf("\nReading file: C:\\Samples\\Tutorial09.xlsx\n");
            EasyXLS::IListPtr rows = workbook->easy_ReadXLSXSheet_AsList_3(
                "C:\\Samples\\Tutorial09.xlsx", "First Tab");

            // Confirm import of Excel file
            _bstr_t sError = workbook->easy_getError();
            if (strcmp(sError, "") == 0){

                // Display imported List values
                for ( int rowIndex=0; rowIndex<rows->size(); rowIndex++)
                {
                    EasyXLS::IListPtr row = (EasyXLS::IListPtr) rows->elementAt(rowIndex);
                    for (int cellIndex=0; cellIndex<row->size(); cellIndex++)
                    {
                        printf("At row %d, column %d the value is '%s'\n", (rowIndex+ 1), (cellIndex+ 1),
                                  (LPCSTR)((_bstr_t)row->elementAt(cellIndex)));
                    }
                }
                printf("\nPress Enter to exit ...");
            }
            else
            {
                printf("\nError reading file C:\\Samples\\Tutorial09.xls %s\n", (LPCSTR)sError);
            }

            // Dispose memory
            workbook->Dispose();
        }
        else{
            printf("Object is not available!");
        }
    }
    else{
        printf("COM can't be initialized!");
    }

    // Uninitialize COM
    CoUninitialize();

    _getch();
    return 0;
}