How to merge cells in C++

/* --------------------------------------------------------------------------------
 * Tutorial 10
 * 
 * This tutorial shows how to export an Excel file with a merged cell range in C++.
 * -------------------------------------------------------------------------------- */

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

int main()
{
    printf("Tutorial 10\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 exports Excel files
        EasyXLS::IExcelDocumentPtr workbook;
        hr = CoCreateInstance(__uuidof(EasyXLS::ExcelDocument),
                              NULL,
                              CLSCTX_ALL,
                              __uuidof(EasyXLS::IExcelDocument),
                              (void**) &workbook) ;

        if (SUCCEEDED(hr)){

            // Create a worksheet
            workbook->easy_addWorksheet_2("Sheet1");

            // Get the table of data for the worksheet
            EasyXLS::IExcelWorksheetPtr xlsFirstTab = 
                (EasyXLS::IExcelWorksheetPtr)workbook->easy_getSheet("Sheet1");
            EasyXLS::IExcelTablePtr xlsTable = xlsFirstTab->easy_getExcelTable();

            // Merge cells by range
            xlsTable->easy_mergeCells_2("A1:C3");

            // Export Excel file
            printf("Writing file C:\\Samples\\Tutorial10 - merge cells in Excel.xlsx.");
            workbook->easy_WriteXLSXFile("C:\\Samples\\Tutorial10 - merge cells in Excel.xlsx");

            // Confirm export of Excel file
            _bstr_t sError = workbook->easy_getError();
            if (strcmp(sError, "") == 0){
                printf("\nFile successfully created. Press Enter to Exit...");
            }
            else{
                printf("\nError encountered: %s", (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;
}

/*-------------------------------------------------------------------------------------
 | Tutorial 10
 |
 | This tutorial shows how to export an Excel file with a merged cell range in C++.NET.
 --------------------------------------------------------------------------------------*/

using namespace System;
using namespace EasyXLS;

int main()
{
    Console::WriteLine("Tutorial 10\n----------\n");

    // Create an instance of the class that exports Excel files
    ExcelDocument ^workbook = gcnew ExcelDocument(1);

    // Get the table of data for the worksheet
    ExcelWorksheet ^xlsFirstTab = safe_cast<ExcelWorksheet^>(workbook->easy_getSheet("Sheet1"));
    ExcelTable ^xlsTable = xlsFirstTab->easy_getExcelTable();

    // Merge cells by range
    xlsTable->easy_mergeCells("A1:C3");

    // Export Excel file
    Console::WriteLine("Writing file C:\\Samples\\Tutorial10 - merge cells in Excel.xlsx.");
    workbook->easy_WriteXLSXFile("C:\\Samples\\Tutorial10 - merge cells in Excel.xlsx");

    // Confirm export of Excel file
    String ^sError = workbook->easy_getError();
    if (sError->Equals(""))
        Console::Write("\nFile successfully created. Press Enter to Exit...");
    else
        Console::Write(String::Concat("\nError encountered: ", sError, "\nPress Enter to Exit..."));

    // Dispose memory
    delete workbook;

    Console::ReadLine();

    return 0;
}