Some Windows users might be experiencing issues when printing from Modern UWP App creates a huge spool file when Advanced Printing feature is selected or enabled. 在今天的帖子中，我们将确定原因，然后针对应用程序打印在Windows 10^{(Windows 10)}中创建大型假脱机文件的问题提供可能的解决方法。

Windows UWP应用程序（又名Modere、Metro或Windows Store应用程序）是一种在Windows 10、Windows 8 和Windows RT、PC^(PCs)和平板电脑上运行的应用程序。与传统的桌面^(Desktop)（或经典）应用不同，UWP应用有一个默认填满整个屏幕的无镶边（即无外框）窗口。

打印Windows 10 UWP应用程序会创建一个大的假脱机文件

当您在包含多个页面上的图像和文本的现代应用程序^{(Modern App)}中打开一个文档（例如PDF文件）并且您尝试使用基于PostScript或 PCL6 的打印机驱动程序打印该文件时，会出现此问题。在打印机属性中，您可以选择打印功能以在每张纸上包含多页。

在这种情况下，当打印作业被发送到打印队列时，您可能会注意到打印作业的大小略大于文件大小。

WinPrint 可以对EMF^(EMF)作业执行多种操作，例如N-Up、小册子^(Booklet)打印和整理^(Collation)。其他自定义打印处理器可能会提供更多功能。EMF需要更多系统资源，因为打印处理器调用GDI/Printer驱动程序将GDI命令转换为打印机语言。如果服务器上的队列仅接受RAW数据类型（换句话说，高级打印功能被禁用），则从GDI命令到PDL的转换发生在客户端上。客户端根本不调用打印处理器，因此失去了高级功能。

根据Microsoft的说法，此问题是预期行为，因为假脱机数据必须从XPS数据转换为增强型元文件^{(Enhanced MetaFile)}( EMF )。这样一来，GDI引擎可以将数据转换为打印设备可以接收的打印机定义语言^{(Printer Definition Language)}( PDL ) 数据。^(PDL)

要解决此问题，Microsoft建议您限制假脱机数据的大小 - 从桌面应用程序打印文档，因为打印设备不需要数据转换。

Large spool file is created when printing Windows 10 UWP app

Some Windows users might be experiencing isѕυes when printing from Modern UWP Aрp creates a huge spool file when Advanced Printing feature is selected or enabled. In today’s post, we will identify the cause and then provide a possible workaround to the issue where app printing creates a large spool file in Windows 10.

A Windows UWP app (aka Modere, Metro, or Windows Store app) is a type of application that runs on Windows 10, Windows 8 and Windows RT, PCs and tablets. Unlike traditional Desktop (or classic) apps, a UWP app has a single, chromeless (i.e., no outside frame) window that fills the entire screen by default.

Printing of Windows 10 UWP app creates a large spool file

This issue occurs when you have a document open in a Modern App that contains images and text on multiple pages, for example, a PDF file and you try to print the file by using a PostScript or PCL6-based printer driver. Within the printer properties, you select the print feature to include more than one page per sheet.

In this scenario when the print job is sent to the print queue, you may notice that the size of the print job is somewhat larger than the file size.

WinPrint can do a variety of things with EMF jobs such as N-Up, Booklet printing, and Collation.  Other custom print processors may provide more features. EMF requires more system resources because the print processor invokes the GDI/Printer driver to convert from GDI commands to the printer language.  If a queue on a server accepts only RAW data type (in other words, the advanced printing features are disabled), then the conversion from GDI commands to PDL happens on the client. The print processor is not invoked at all on the client, hence the loss of advanced features.

According to Microsoft, this issue is expected behavior as the spooled data has to be converted from XPS data to an Enhanced MetaFile (EMF). This is so that data can be converted by the GDI engine into the Printer Definition Language (PDL) data which the print device can then receive.

To work around this issue, Microsoft suggests that you limit the size of the spooled data – print the documents from a desktop application as there will be no data conversion required for the print device.

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