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

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Aspose.Cells provides a way to detect the file format of encrypted Microsoft Open XML files. To identify the file type, use the FileFormatUtil.detectFileFormat(Uint8Array) method as shown below in the code example.

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells FileFormat Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, FileFormatUtil, Utils } = AsposeCells;
        
        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");

            document.getElementById('runExample').addEventListener('click', async () => {
                // Create a small byte stream equivalent to the original JavaScript Buffer
                const stream = new Uint8Array([0x50, 0x4B, 0x03, 0x04]);

                // Verify password (will propagate errors if any)
                FileFormatUtil.verifyPassword(stream, "1234");

                // Detect file format
                const fileFormatInfo = FileFormatUtil.detectFileFormat(stream);

                // Use property access per universal getter/setter conversion
                document.getElementById('result').innerHTML = '<p>File Format: ' + fileFormatInfo.fileFormatType + '</p>';
                console.log("File Format: " + fileFormatInfo.fileFormatType);
            });
        });
    </script>
</html>