Silverlight 5打印乱码报告 [英] Silverlight 5 printing garbled Reports

问题描述

我使用C1ReportViewer控件，并已经在C1论坛上发布了一个问题，但我认为我会发布在这里，以查看是否有人遇到过类似的问题。该控件使用通用的silverlight PrintDocument（）方法。

I am using a C1ReportViewer control, and have already posted a question on the C1 forums, however i thought i would post here as well to see if anyone had run across a similar issue. The control uses the generic silverlight PrintDocument() method.

在Silverlight 5中从此控件打印Crystal报表时，报表有时会显示乱码，线和一般不在位置。它也很少打印整个报告。

When printing a Crystal Report from this control in Silverlight 5 sometimes the report prints out garbled, meaning different sized text, tapered lines and generally out of position. It also rarely prints the entire report.

我已经将问题缩小到几个打印机，只有使用32位驱动程序的机器。基于这一点，以及对Silverlight 5的更改，我假设这个问题围绕着PostScript兼容性。然而，由于我们的产品是LOB应用程序，强制执行PS兼容的打印机和打印机驱动程序几乎是没有问题的。

I have narrowed the issue down to a few printers, and only with machines using their 32 bit drivers. Based upon this, and the changes made to Silverlight 5, i am assuming the issue revolves around PostScript compatibility. However, as our product is LOB application, enforcing PS compatible printers and printer drivers is nearly out of the question.

因此，如果这确实是一个后脚本问题，基于根据silverlight 5的文档，PrintDocument（）方法应该失败回到默认位图方法。请参阅我是否正确要了解在SilverLight 5中的矢量打印只能使用Postscript打印机吗？

Accordingly, if this is indeed a post script issue, based upon the documentation for silverlight 5, the PrintDocument() method should be failing back to the default bitmap method. See Am I correct in understanding that vector printing in SilverLight 5 will only work with a Postscript printer?

我的stackoverflow问题是：有人遇到类似的问题，在Silverlight 5，或有任何人有成功打印水晶报表/ PDF？

My question for stackoverflow is: Has anyone encountered a similar issue in with printing in Silverlight 5, or has anyone had success printing Crystal Reports/PDFs? And in the off chance that anyone has, what solutions have you come up with?

很感激，

Greg

推荐答案

我能够想出一个解决方案。

I was able to come up with a solution for this. Instead of using the built in C1 Printing functionality I was able to write some code to force bitmap printing.

首先，我创建了一个新的PrintDocument，并挂接了一些处理程序为它的PrintPage事件。

First i created a new PrintDocument, and hooked up some handlers for its PrintPage event.

mobjPrintDocument = New PrintDocument
RemoveHandler mobjPrintDocument.PrintPage, AddressOf Print_Report
AddHandler mobjPrintDocument.PrintPage, AddressOf Print_Report

然后，无论何时打印，我们都可以在PrintDocument上调用PrintBitmap函数。这里我在用户点击打印按钮时这样做。

Then we can call the PrintBitmap function on the PrintDocument whenever you want to print. Here I am doing it when the user clicks the Print button.

 Private Sub xbtnPrint_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
    mintPageIndex = 0
    mobjPrintDocument.PrintBitmap(FileName)
  End Sub

现在是重要的部分。我们可以通过挂钩到PrintPage事件中来劫持目标内容（如上所述）。我可以设置e.PageVisual到任何视觉xaml元素，PrintBitmap将处理它。这里我使用GetPages函数和循环，以确保我打印每个页面（一个pdfviewer元素）。

Now comes the important part. We can hijack the content targeted by hooking into the PrintPage event (as handled above). I can set the e.PageVisual to any visual xaml element and the PrintBitmap will handle it. Here I use the GetPages function and loop through to make sure I print each page (a pdfviewer element). However, you can point it to any visual element like I said.

  Private Sub Print_Report(sender As System.Object, e As PrintPageEventArgs)
    e.PageVisual = xobjReportViewer.GetPages(mintPageIndex)
    mintPageIndex += 1
    e.HasMorePages = mintPageIndex < xobjReportViewer.GetPages.Count
  End Sub

e.HasMorePages允许您强制

The e.HasMorePages allows you to force the firing of this event until you are finished.

希望这对某人有帮助。使用Silverlight 5和Post-Script打印机支持，许多具有PostScript仿真器的打印机可能不兼容，但也不会默认为位图打印。此解决方法修复了，使打印在LOB类型应用程序中更稳定。

Hope this is helpful to someone. With Silverlight 5 and the Post-Script printer support, alot of printers that have a PostScript emulator may not be compatible, but will also not default to bitmap printing. This workaround fixes that, making printing a little bit more stable in a LOB type application.

这篇关于Silverlight 5打印乱码报告的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！