Detect File Format of Encrypted Office Open XML - OOXML Files with C++

Office Open XML (also known as OOXML or Microsoft Open XML (MOX)) is an XML‑based file format developed by Microsoft for representing office documents like spreadsheets, charts, presentations, and word‑processing documents.

Aspose.Cells provides a way to detect the file format of encrypted Office Open XML files. To identify the file type, use the FileFormatUtil.DetectFileFormat method as shown below in the code example.

#include <iostream>
#include <fstream>
#include "Aspose.Cells.h"
using namespace Aspose::Cells;

Vector<uint8_t> GetDataFromFile(const U16String& file)
{
    std::string f = file.ToUtf8();
    // open the file 
    std::ifstream fileStream(f, std::ios::binary);

    if (!fileStream.is_open()) {
        std::cerr << "Failed to open the file." << std::endl;
        return 1;
    }

    // Get file size
    fileStream.seekg(0, std::ios::end);
    std::streampos fileSize = fileStream.tellg();
    fileStream.seekg(0, std::ios::beg);

    // Read file contents into uint8_t array
    uint8_t* buffer = new uint8_t[fileSize];
    fileStream.read(reinterpret_cast<char*>(buffer), fileSize);
    fileStream.close();

    Vector<uint8_t> data(buffer, fileSize);
    delete[] buffer;

    return data;
}

int main()
{
    Aspose::Cells::Startup();

    U16String srcDir(u"..\\Data\\01_SourceDirectory\\");
    U16String filename = srcDir + u"encryptedBook1.out.tmp";

    Vector<uint8_t> fileStream = GetDataFromFile(filename);
    FileFormatInfo fileFormatInfo = FileFormatUtil::DetectFileFormat(fileStream, u"1234");

    std::cout << "File Format: " << static_cast<int>(fileFormatInfo.GetFileFormatType()) << std::endl;

    Aspose::Cells::Cleanup();
    return 0;
}