通过 Node.js 结合 C++ 跟踪文档转换进度

可能的使用场景

有时候转换大型Excel文件需要一些时间。在此期间，你可能希望显示文档转换进度，而不是仅仅显示加载屏幕，以提升应用程序的易用性。Aspose.Cells for Node.js via C++ 支持通过提供 IPageSavingCallback 接口来跟踪文档转换过程。IPageSavingCallback 接口提供 IPageSavingCallback.pageStartSaving(PageStartSavingArgs) 和 IPageSavingCallback.pageEndSaving(PageEndSavingArgs) 方法，你可以在自定义类中实现它们。你还可以控制哪些页面被渲染，方法如 TestPageSavingCallback 自定义类所示。

跟踪文档转换进度

以下代码示例加载 源Excel文件，并通过实现 IPageSavingCallback 接口的 TestPageSavingCallback 自定义类在控制台打印转换进度。

示例代码

const path = require("path");
const AsposeCells = require("aspose.cells.node");

// Source directory
const sourceDir = path.join(__dirname, "data");
// Output directory
const outputDir = path.join(__dirname, "output");

// Define TestPageSavingCallback class
class TestPageSavingCallback {
// Implement the required methods of this callback as needed
onPageSaving(pageIndex, fileName) {
console.log(`Saving page ${pageIndex} to ${fileName}`);
}
}

const workbook = new AsposeCells.Workbook(path.join(sourceDir, "PagesBook1.xlsx"));

const pdfSaveOptions = new AsposeCells.PdfSaveOptions();
pdfSaveOptions.setPageSavingCallback(new TestPageSavingCallback());

workbook.save(path.join(outputDir, "DocumentConversionProgress.pdf"), pdfSaveOptions);

以下是 TestPageSavingCallback 自定义类的代码。

const AsposeCells = require("aspose.cells.node");

class TestPageSavingCallback {
pageStartSaving(args) {
console.log(`Start saving page index ${args.getPageIndex()} of pages ${args.getPageCount()}`);

// don't output pages before page index 2.
if (args.getPageIndex() < 2) {
args.setIsToOutput(false);
}
}

pageEndSaving(args) {
console.log(`End saving page index ${args.getPageIndex()} of pages ${args.getPageCount()}`);

// don't output pages after page index 8.
if (args.getPageIndex() >= 8) {
args.setHasMorePages(false);
}
}
}

控制台输出

  

Start saving page index 0 of pages 11</br>  
End saving page index 0 of pages 11</br>  
Start saving page index 1 of pages 11</br>  
End saving page index 1 of pages 11</br>  
Start saving page index 2 of pages 11</br>  
End saving page index 2 of pages 11</br>  
Start saving page index 3 of pages 11</br>  
End saving page index 3 of pages 11</br>  
Start saving page index 4 of pages 11</br>  
End saving page index 4 of pages 11</br>  
Start saving page index 5 of pages 11</br>  
End saving page index 5 of pages 11</br>  
Start saving page index 6 of pages 11</br>  
End saving page index 6 of pages 11</br>  
Start saving page index 7 of pages 11</br>  
End saving page index 7 of pages 11</br>  
Start saving page index 8 of pages 11</br>  
End saving page index 8 of pages 11