Change the Font on just the specific Unicode characters while saving to PDF with JavaScript via C++

Example

The following screenshot compares the two output PDFs generated by the sample code below.

One is generated without setting PdfSaveOptions.isFontSubstitutionCharGranularity property and the other was generated after setting the PdfSaveOptions.isFontSubstitutionCharGranularity property to true.

As you can see in the first PDF, the font of the entire sentence has changed from Times New Roman to Arial Unicode MS because of the Non-Breaking Hyphen. While in the second PDF, only the font of Non-Breaking Hyphen has changed.

First Pdf File
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Second Pdf File
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Sample Code

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink1" style="display: none; margin-right: 10px;">Download Result PDF 1</a>
        <a id="downloadLink2" style="display: none;">Download Result PDF 2</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, PdfSaveOptions } = 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 resultDiv = document.getElementById('result');
            resultDiv.innerHTML = '<p>Running example...</p>';

            // Create workbook object
            const workbook = new Workbook();

            // Access the first worksheet
            const worksheet = workbook.worksheets.get(0);

            // Access cells
            const cell1 = worksheet.cells.get("A1");
            const cell2 = worksheet.cells.get("B1");

            // Set the styles of both cells to Times New Roman
            let style = cell1.style;
            style.font.name = "Times New Roman";
            cell1.style = style;
            cell2.style = style;

            // Put the values inside the cell
            cell1.value = "Hello without Non-Breaking Hyphen";
            cell2.value = "Hello" + String.fromCharCode(8209) + " with Non-Breaking Hyphen";

            // Autofit the columns
            worksheet.autoFitColumns();

            // Save to Pdf without setting PdfSaveOptions.IsFontSubstitutionCharGranularity
            const outputData1 = workbook.save(SaveFormat.Pdf);
            const blob1 = new Blob([outputData1]);
            const downloadLink1 = document.getElementById('downloadLink1');
            downloadLink1.href = URL.createObjectURL(blob1);
            downloadLink1.download = 'SampleOutput_out.pdf';
            downloadLink1.style.display = 'inline-block';
            downloadLink1.textContent = 'Download SampleOutput_out.pdf';

            // Save to Pdf after setting PdfSaveOptions.IsFontSubstitutionCharGranularity to true
            const opts = new PdfSaveOptions();
            opts.isFontSubstitutionCharGranularity = true;
            const outputData2 = workbook.save(SaveFormat.Pdf, opts);
            const blob2 = new Blob([outputData2]);
            const downloadLink2 = document.getElementById('downloadLink2');
            downloadLink2.href = URL.createObjectURL(blob2);
            downloadLink2.download = 'SampleOutput2_out.pdf';
            downloadLink2.style.display = 'inline-block';
            downloadLink2.textContent = 'Download SampleOutput2_out.pdf';

            resultDiv.innerHTML = '<p style="color: green;">Operation completed successfully! Use the download links to get the generated PDFs.</p>';
        });
    </script>
</html>