[英]VSTO OpenXml C# - Edit PowerPoint on Runtime
我已经阅读了很多关于使用 OpenXml 编辑 pptx 文件的内容,例如
PresentationDocument presentationDocument = PresentationDocument.Open("C:\\Users\\beggers\\Desktop\\Test.pptx", true)
但是如何在运行时修改幻灯片/演示文稿的 XML 数据? 特别是当我运行一个新的演示文稿时,女巫不会被保存。
我正在开发 C# VSTO 插件,我想以某种方式修改我的幻灯片/xml,Microsoft.Office.Interop 不支持这种方式。
不幸的是,Microsoft Word 是唯一提供用于读取甚至写入 Open XML 标记的互操作 API 的 Office 应用程序,在这种情况下,对于给定的Range
对象(它也可以是代表整个主要文档部分的Range
)。 Excel 和 PowerPoint 都没有提供这种功能。
但是,即使 Microsoft Word 也不会给您完整的标记,这意味着您无法通过阅读或更改 Open XML 标记来阅读或更改打开文档的每个方面。 因此,根据您希望对文档执行的操作,您甚至必须关闭和重新打开 Word 文档才能访问和处理完整的 Open XML 标记。
执行此操作的次优但功能性方法是使用剪贴板往返。 复制到剪贴板的幻灯片实际上被打包为 ppt 数据(这只是一个 zip)。 而且您可以控制剪贴板并插入等幻灯片。 所以基本上:
以下是第 2-3 步的示例,使用此Open XML 示例作为基础,将剪贴板中第一张幻灯片中的所有文本写入控制台:
using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Drawing;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Presentation;
using P = DocumentFormat.OpenXml.Presentation;
using D = DocumentFormat.OpenXml.Drawing;
using DocumentFormat.OpenXml.Office2016.Drawing.ChartDrawing;
namespace PPClipboardTest
{
class Program
{
public static string format = "PowerPoint 14.0 Slides Package";
// Get all the text in a slide.
public static string[] GetAllTextInSlide(string presentationFile, int slideIndex)
{
// Open the presentation as read-only.
using (PresentationDocument presentationDocument = PresentationDocument.Open(presentationFile, false))
{
// Pass the presentation and the slide index
// to the next GetAllTextInSlide method, and
// then return the array of strings it returns.
return GetAllTextInSlide(presentationDocument, slideIndex);
}
}
public static string[] GetAllTextInSlide(PresentationDocument presentationDocument, int slideIndex)
{
// Verify that the presentation document exists.
if (presentationDocument == null)
{
throw new ArgumentNullException("presentationDocument");
}
// Verify that the slide index is not out of range.
if (slideIndex < 0)
{
throw new ArgumentOutOfRangeException("slideIndex");
}
// Get the presentation part of the presentation document.
PresentationPart presentationPart = presentationDocument.PresentationPart;
// Verify that the presentation part and presentation exist.
if (presentationPart != null && presentationPart.Presentation != null)
{
// Get the Presentation object from the presentation part.
Presentation presentation = presentationPart.Presentation;
// Verify that the slide ID list exists.
if (presentation.SlideIdList != null)
{
// Get the collection of slide IDs from the slide ID list.
DocumentFormat.OpenXml.OpenXmlElementList slideIds =
presentation.SlideIdList.ChildElements;
// If the slide ID is in range...
if (slideIndex < slideIds.Count)
{
// Get the relationship ID of the slide.
string slidePartRelationshipId = (slideIds[slideIndex] as SlideId).RelationshipId;
// Get the specified slide part from the relationship ID.
SlidePart slidePart =
(SlidePart)presentationPart.GetPartById(slidePartRelationshipId);
// Pass the slide part to the next method, and
// then return the array of strings that method
// returns to the previous method.
return GetAllTextInSlide(slidePart);
}
}
}
// Else, return null.
return null;
}
public static string[] GetAllTextInSlide(SlidePart slidePart)
{
// Verify that the slide part exists.
if (slidePart == null)
{
throw new ArgumentNullException("slidePart");
}
// Create a new linked list of strings.
LinkedList<string> texts = new LinkedList<string>();
// If the slide exists...
if (slidePart.Slide != null)
{
// Iterate through all the paragraphs in the slide.
foreach (DocumentFormat.OpenXml.Drawing.Paragraph paragraph in
slidePart.Slide.Descendants<DocumentFormat.OpenXml.Drawing.Paragraph>())
{
// Create a new string builder.
StringBuilder paragraphText = new StringBuilder();
// Iterate through the lines of the paragraph.
foreach (DocumentFormat.OpenXml.Drawing.Text text in
paragraph.Descendants<DocumentFormat.OpenXml.Drawing.Text>())
{
// Append each line to the previous lines.
paragraphText.Append(text.Text);
}
if (paragraphText.Length > 0)
{
// Add each paragraph to the linked list.
texts.AddLast(paragraphText.ToString());
}
}
}
if (texts.Count > 0)
{
// Return an array of strings.
return texts.ToArray();
}
else
{
return null;
}
}
[STAThread]
static void Main(string[] args)
{
IDataObject iData = new DataObject();
iData = Clipboard.GetDataObject();
string[] formats = iData.GetFormats();
foreach(string f in formats)
{
if(f == format)
{
MemoryStream ms = iData.GetData(format) as MemoryStream;
using (PresentationDocument pres = PresentationDocument.Open(ms, true))
{
string[] allText = GetAllTextInSlide(pres, 0);
Console.Write("Text in first slide copied to clipboard:\n");
foreach (string txt in allText)
{
Console.Write(txt + "\n");
}
}
/*
// Write to file
using (FileStream file = new FileStream("file.ppt", FileMode.Create, System.IO.FileAccess.Write)) // Bin chunk from clipboard is just a zip file
{
byte[] bytes = new byte[ms.Length];
ms.Read(bytes, 0, (int)ms.Length);
file.Write(bytes, 0, bytes.Length);
ms.Close();
}
*/
break;
}
}
}
}
}
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