跟踪Excel转换为TIFF的进度

可能的使用场景

有时,转换大型Excel文件可能需要一些时间。在此期间,您可能希望显示文档转换进度,而不仅仅是一个加载屏幕,以增强应用程序的可用性。Aspose.Cells支持通过提供IPageSavingCallback接口来跟踪文档转换过程。IPageSavingCallback接口提供PageStartSavingPageEndSaving方法,您可以在自定义类中实现这些方法。您还可以控制渲染哪些页面,就像TestTiffPageSavingCallback自定义类中所演示的那样。

跟踪Excel转换为TIFF的进度

以下代码示例通过使用实现了IPageSavingCallback接口的TestTiffPageSavingCallback自定义类,在控制台中打印出source excel file的转换进度。已附上生成的输出文件供您参考。

输出文件

示例代码

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
// The path to the source directory.
String sourceDir = Utils.Get_SourceDirectory();
// The path to the output directory.
String outputDir = Utils.Get_OutputDirectory();
Workbook wb = new Workbook(sourceDir + "sampleUseWorkbookRenderForImageConversion.xlsx");
ImageOrPrintOptions opts = new ImageOrPrintOptions();
opts.setPageSavingCallback(new TestTiffPageSavingCallback());
opts.setImageType(ImageType.TIFF);
WorkbookRender wr = new WorkbookRender(wb, opts);
wr.toImage(outputDir + "DocumentConversionProgressForTiff_out.tiff");

以下是TestTiffPageSavingCallback自定义类的代码。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
class TestTiffPageSavingCallback implements IPageSavingCallback {
public void pageStartSaving(PageStartSavingArgs args)
{
System.out.println("Start saving page index " + args.getPageIndex() + " of pages " + args.getPageCount());
//don't output pages before page index 2.
if (args.getPageIndex() < 2)
{
args.setToOutput(false);
}
}
public void pageEndSaving(PageEndSavingArgs args)
{
System.out.println("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 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