在使用Node.js通过C++为已签名的Excel文件添加数字签名
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可能的使用场景
Aspose.Cells for Node.js via C++提供了Workbook.addDigitalSignature(digitalSignatureCollection)方法，可以用来为已签名的Excel文件添加数字签名。
在为已签名的Excel文档添加数字签名时请注意，如果原始文档由Aspose.Cells生成，则效果良好。但如果由其他引擎（如Microsoft Excel等）生成，Aspose.Cells在加载和重新保存后可能无法保持文件一致，从而使原始签名无效。
如何向已经签名的Excel文件添加数字签名
以下示例代码演示了如何使用Workbook.addDigitalSignature(digitalSignatureCollection)方法为已签名的Excel文件添加数字签名。请查看此代码使用的示例Excel文件，该文件已进行数字签名。然后查看由代码生成的输出Excel文件。在此代码中使用了名为AsposeDemo.pfx的演示证书，密码为aspose。截图显示了示例代码执行后对示例Excel文件的效果。
示例代码
const AsposeCells = require("aspose.cells.node");
const path = require("path");
const dataDir = path.join(__dirname, "data");
// Certificate file path and password
const certFileName = path.join(dataDir, "AsposeDemo.pfx");
const password = "aspose";
// Load the workbook which is already digitally signed to add new digital signature
const workbook = new AsposeCells.Workbook(path.join(dataDir, "sampleDigitallySignedByCells.xlsx"));
// Create the digital signature collection
const dsCollection = new AsposeCells.DigitalSignatureCollection();
// Create new digital signature and add it in digital signature collection
const signature = new AsposeCells.DigitalSignature(certFileName, password, "Aspose.Cells added new digital signature in existing digitally signed workbook.", new Date());
dsCollection.add(signature);
// Add digital signature collection inside the workbook
workbook.addDigitalSignature(dsCollection);
// Save the workbook and dispose of it.
workbook.save(path.join(__dirname, "outputDigitallySignedByCells.xlsx"));
workbook.dispose();