Verificar si la firma digital del código VBA es válida con JavaScript a través de C++

** Verificar si la firma digital del código VBA es válida en JavaScript**

El siguiente código demuestra el uso de esta propiedad utilizando el archivo excel de muestra que puedes descargar desde el enlace proporcionado. El mismo archivo de Excel tiene una firma válida pero cuando modificamos su código VBA y guardamos el libro de trabajo y luego volvemos a verificar, encontramos que su firma se ha vuelto inválida.

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells VBA Signature Example</title>
    </head>
    <body>
        <h1>VBA Signature Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.xlsm,.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, 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 () => {
            const fileInput = document.getElementById('fileInput');
            const resultEl = document.getElementById('result');
            if (!fileInput.files.length) {
                resultEl.innerHTML = '<p style="color: red;">Please select an Excel file (preferably .xlsm).</p>';
                return;
            }

            const file = fileInput.files[0];
            const arrayBuffer = await file.arrayBuffer();

            // Loads the workbook which contains the VBA project
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Signature status before modification
            const isSignedBefore = workbook.vbaProject.isValidSigned();
            console.log("Is VBA Code Project Valid Signed: " + isSignedBefore);

            // Modify the VBA Code, save the workbook then reload
            // VBA Code Signature will now be invalid
            let code = workbook.vbaProject.modules.get(1).codes;
            code = code.replace("Welcome to Aspose", "Welcome to Aspose.Cells");
            workbook.vbaProject.modules.get(1).codes = code;

            // Save the modified workbook to a downloadable blob
            const outputData = workbook.save(SaveFormat.Xlsm);
            const blob = new Blob([outputData], { type: 'application/vnd.ms-excel.sheet.macroEnabled.12' });
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output_out.xlsm';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Modified Excel File';

            // Reload from the saved output data to verify signature status
            const reloadedWorkbook = new Workbook(new Uint8Array(outputData));
            const isSignedAfter = reloadedWorkbook.vbaProject.isValidSigned();
            console.log("Is VBA Code Project Valid Signed: " + isSignedAfter);

            // Update result UI
            resultEl.innerHTML = `
                <p style="color: green;">Operation completed successfully!</p>
                <p>Signature valid before modification: <strong>${isSignedBefore}</strong></p>
                <p>Signature valid after modification: <strong>${isSignedAfter}</strong></p>
                <p>Click the download link to get the modified file.</p>
            `;
        });
    </script>
</html>