EasyXLS

How to export data to XLSX file in C++

/* -------------------------------------------------------------
 * Tutorial 28
 * 
 * This tutorial shows how to export data to XLSX file that has
 * multiple sheets in C++. The first sheet is filled with data.
 * ------------------------------------------------------------- */
Click here to see the Excel file

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

int _tmain(int argc, _TCHAR* argv[])
{
    printf("Tutorial 28\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 two sheets
            workbook->easy_addWorksheet_2("First tab");
            workbook->easy_addWorksheet_2("Second tab");

            // Get the table of data for the first worksheet
            EasyXLS::IExcelWorksheetPtr xlsFirstTab= (EasyXLS::IExcelWorksheetPtr)workbook->easy_getSheetAt(0);
            EasyXLS::IExcelTablePtr xlsFirstTable = xlsFirstTab->easy_getExcelTable();

            // Add data in cells for report header
            char* cellValue = (char*)malloc(11*sizeof(char));
            char* columnNumber = (char*)malloc(sizeof(char));
            for (int column=0; column<5; column++)
            {
                strcpy_s(cellValue, 8, "Column ");
                _itoa_s(column+ 1, columnNumber, 2, 10);
                strcat_s(cellValue, 10, columnNumber);
                xlsFirstTable->easy_getCell(0,column)->setValue(cellValue);
                xlsFirstTable->easy_getCell(0,column)->setDataType(DATATYPE_STRING);
            }

            // Add data in cells for report values
            char*  rowNumber = (char*)malloc(sizeof(char));
            for (int row=0; row<100; row++)
            {
                for (int column=0; column<5; column++)
                {
                    strcpy_s(cellValue, 6, "Data ");
                    _itoa_s(column+ 1, columnNumber, 2, 10);
                    _itoa_s(row + 1, rowNumber, 4, 10);

                    strcat_s(cellValue, 10, rowNumber);
                    strcat_s(cellValue, 12, ", ");
                    strcat_s(cellValue, 13, columnNumber);

                    xlsFirstTable->easy_getCell(row+1,column)->setValue(cellValue); 
                    xlsFirstTable->easy_getCell(row+1,column)->setDataType(DATATYPE_STRING);
                }
            }
            
            // Set column widths
            xlsFirstTable->easy_getColumnAt(0)->setWidth(70);
            xlsFirstTable->easy_getColumnAt(1)->setWidth(100);
            xlsFirstTable->easy_getColumnAt(2)->setWidth(70);
            xlsFirstTable->easy_getColumnAt(3)->setWidth(100);
            xlsFirstTable->easy_getColumnAt(4)->setWidth(70);

            // Export the XLSX file
            printf("Writing file C:\\Samples\\Tutorial28.xlsx.");
            workbook->easy_WriteXLSXFile("C:\\Samples\\Tutorial28.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;
}

C++ and .NET Framework
This tutorial is valid for C++ applications that cannot use .NET Framework. It is recommended, for better performances, that if the C++ application already uses or can use .NET Framework to make use of this similar code sample.

Overloaded methods
For methods with same name but different parameters, only the first method overload retains the original name. Subsequent overloads are uniquely renamed by appending to the method name '_2', '_3', etc (method, method_2, method_3), an integer that corresponds to the order of declaration that can be found in EasyXLS.h, a file that comes with EasyXLS installation.

EasyXLS Excel libraries:

.NET
Excel Library for C++
full COM+ version to import, export or convert Excel files
Excel Writer for C++
COM+ version to create and export Excel files
Download EasyXLS™ Excel Library for C++

File formats:

MS Excel 97 - 2003
MS Excel 2007 - 2010
MS Excel 2013
MS Excel 2016
MS Excel 2019
XLSX XLSM XLSB XLS
XML HTML CSV TXT