EasyXLS

How to read XLSX file in C++

EasyXLS Excel library can be used to import Excel files in C++. The integration varies depending on the project technique, if .NET Framework can be used or not.

EasyXLS using COM+ for projects without .NET Framework

If you opt for the COM+ version of EasyXLS, be sure that you have EasyXLS installed and registered on your machine.

Step 1: Download and install EasyXLS Excel Library for .NET/COM+

To download the trial version of EasyXLS Excel Library, press the below button:

Download EasyXLS™ Excel Library for C++

If you already own a license key, you may login and download EasyXLS from your account.

Step 2: Verify if EasyXLS is registered

Check if EasyXLS component is present in Component Services.

Step 3: Run C++ code that reads XLSX file

Execute the following C++ code that imports an XLSX file.

/* ------------------------------------------------------------------------------
 * Tutorial 36
 * 
 * This tutorial shows how to read an Excel XLSX file in C++ (the
 * XLSX file generated by Tutorial 04 as base template), modify
 * some data and save it to another XLSX file (Tutorial36 - read XLSX file.xlsx).
 * --------------------------------------------------------------------------- */

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

int _tmain(int argc, _TCHAR* argv[])
{
    printf("Tutorial 36\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 reads Excel files
        EasyXLS::IExcelDocumentPtr workbook;
        hr = CoCreateInstance(__uuidof(EasyXLS::ExcelDocument),
                              NULL,
                              CLSCTX_ALL,
                              __uuidof(EasyXLS::IExcelDocument),
                              (void**) &workbook) ;

        if (SUCCEEDED(hr)){

            // Read XLSX file
            printf("\nReading file: C:\\Samples\\Tutorial04.xlsx\n");
            if (workbook->easy_LoadXLSXFile("C:\\Samples\\Tutorial04.xlsx"))
            {
                // Get the table of data for the second worksheet
                EasyXLS::IExcelWorksheetPtr xlsSecondTab = 
                    (EasyXLS::IExcelWorksheetPtr)workbook->easy_getSheetAt(1);
                EasyXLS::IExcelTablePtr xlsTable = xlsSecondTab->easy_getExcelTable();

                // Write some data to the second sheet
                xlsTable->easy_getCell_2("A1")->setValue("Data added by Tutorial36");

                char* cellValue = (char*)malloc(11*sizeof(char));
                char* columnNumber = (char*)malloc(sizeof(char));
                for (int column=0; column<5; column++)
                {
                    strcpy_s(cellValue, 6, "Data ");
                    _itoa_s(column+ 1, columnNumber, 2, 10);
                    strcat_s(cellValue, 10, columnNumber);
                    xlsTable->easy_getCell(1, column)->setValue(cellValue);
                }

                // Export the new XLSX file
                printf("Writing file C:\\Samples\\Tutorial36 - read XLSX file.xlsx.");
                workbook->easy_WriteXLSXFile("C:\\Samples\\Tutorial36 - read XLSX file.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);
                }
            }
            else
            {
                printf("\nError reading file C:\\Samples\\Tutorial04.xlsx %s\n",
                            (LPCSTR)((_bstr_t)workbook->easy_getError()));
            }

            // 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 in C++.NET projects using .NET Framework

If you opt for the .NET Framework version of EasyXLS, you need a C++.NET project and to include EasyXLS.dll into project.

Step 1: Download and install EasyXLS Excel Library for .NET

To download the trial version of EasyXLS Excel Library, press the below button:

Download EasyXLS™ Excel Library for C++.NET

If you already own a license key, you may login and download EasyXLS from your account.

Step 2: Include EasyXLS library into project

EasyXLS.dll must be added to your project. EasyXLS.dll can be found after installing EasyXLS, in "Dot NET version" folder.

Step 3: Run C++ code that reads XLSX file

Execute the following C++ code that imports an XLSX file.

/*-------------------------------------------------------------------------------
 | Tutorial 36
 |
 | This tutorial shows how to read an Excel XLSX file in C++.NET (the
 | XLSX file generated by Tutorial 04 as base template), modify
 | some data and save it to another XLSX file (Tutorial36 - read XLSX file.xlsx).
 ------------------------------------------------------------------------------*/

#include "stdafx.h"

using namespace System;
using namespace EasyXLS;
using namespace System::Data;
using namespace System::IO;

int main()
{
    Console::WriteLine("Tutorial 36\n----------\n");

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

    // Read XLSX file
    Console::WriteLine("Reading file C:\\Samples\\Tutorial04.xlsx.\n");
    if (workbook->easy_LoadXLSXFile("C:\\Samples\\Tutorial04.xlsx"))
    {
        // Get the table of data for the second worksheet
        ExcelWorksheet ^xlsSecondTab = safe_cast<ExcelWorksheet^>(workbook->easy_getSheet("Second tab"));
        ExcelTable ^xlsSecondTable = xlsSecondTab->easy_getExcelTable();

        // Write some data to the second sheet
        xlsSecondTable->easy_getCell("A1")->setValue("Data added by Tutorial36");
        for (int column=0; column<5; column++)
        {
            xlsSecondTable->easy_getCell(1, column)->setValue(String::Concat("Data ", (column + 1).ToString()));
        }

        // Export the new XLSX file
        Console::WriteLine("Writing file C:\\Samples\\Tutorial36 - read XLSX file.xlsx.");
        workbook->easy_WriteXLSXFile("C:\\Samples\\Tutorial36 - read XLSX file.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..."));
    }
    else
    {
        Console::WriteLine(String::Concat("\nError reading file C:\\Samples\\Tutorial04.xlsx \n", 
            workbook->easy_getError(), "\nPress Enter to Exit..."));
    }

    // Dispose memory
    delete workbook;

    Console::ReadLine();

    return 0;
}

EasyXLS Excel libraries:

.NET
Excel Library for C++
full COM+ version to import, export or convert Excel files
Excel Reader for C++
COM+ version to read and import 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
XLSXXLSMXLSBXLS
XMLHTMLCSVTXT