Track Conversion Progress of Excel to TIFF with Node.js via C++

Possible Usage Scenarios

Sometimes converting large Excel files can take some time. During this time, you might want to show the document conversion progress instead of just a loading screen to enhance the usability of your application. Aspose.Cells for Node.js via C++ supports tracking document conversion process by providing the IPageSavingCallback interface. The IPageSavingCallback interface provides pageStartSaving(PageStartSavingArgs) and pageEndSaving(PageEndSavingArgs) methods that you can implement in your custom class. You may also control which pages are rendered as demonstrated in the TestPageSavingCallback custom class.

Track Conversion Progress of Excel to TIFF

The following code sample loads the source excel file and prints its conversion progress in the console by using the TestPageSavingCallback custom class that implements the IPageSavingCallback interface. The output file generated is attached for your reference.

Output File

Sample Code

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

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

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

const filePath = path.join(sourceDir, "sampleUseWorkbookRenderForImageConversion.xlsx");
const workbook = new AsposeCells.Workbook(filePath);
const opts = new AsposeCells.ImageOrPrintOptions();

// Define TestTiffPageSavingCallback
class TestTiffPageSavingCallback {
// Implement required methods for the callback here
}

opts.setPageSavingCallback(new TestTiffPageSavingCallback());
opts.setImageType(AsposeCells.ImageType.Tiff);

const wr = new AsposeCells.WorkbookRender(workbook, opts);
wr.toImage(path.join(outputDir, "DocumentConversionProgressForTiff_out.tiff"));

The following is the code for the TestTiffPageSavingCallback custom class.

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

class TestTiffPageSavingCallback {
pageStartSaving(args) {
console.log(`Start saving page index ${args.pageIndex} of pages ${args.pageCount}`);

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

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

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

Console Output

Start saving page index 0 of pages 10</br>
End saving page index 0 of pages 10</br>
Start saving page index 1 of pages 10</br>
End saving page index 1 of pages 10</br>
Start saving page index 2 of pages 10</br>
End saving page index 2 of pages 10</br>
Start saving page index 3 of pages 10</br>
End saving page index 3 of pages 10</br>
Start saving page index 4 of pages 10</br>
End saving page index 4 of pages 10</br>
Start saving page index 5 of pages 10</br>
End saving page index 5 of pages 10</br>
Start saving page index 6 of pages 10</br>
End saving page index 6 of pages 10</br>
Start saving page index 7 of pages 10</br>
End saving page index 7 of pages 10</br>
Start saving page index 8 of pages 10</br>
End saving page index 8 of pages 10</br>