用Open XML SDK 获取PPT标题和内容（C#）

motivation：

　　毕设有一个小部分，是抽取从各种公开课下载的PPT的内容。之前用Python的win32com弄到哭也只弄出了纯文本，而不能识别哪些是标题（理论上应该是可以的？我看到源码里有HaveTitle等等的内容，然而调用就跪，QAQ）。然后就只抽出了纯文本，放弃治疗改用维基百科做知识库了。扔在一边就去做别的了。

　　于是这周老师又重新让我抽标题OTL，就搜到了这个看起来很厉害的东西。学习ING。

prework:

　　下载：https://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=5124　download里的两个文件，先装v2再装tool

　　在项目里加引用：解决方案资源管理器里，有个引用，左键添加引用，在扩展里添加DocumentFormat.OpenXml，框架里添加windowspackage

gao：

reference：https://msdn.microsoft.com/zh-cn/library/cc850843(v=office.14)# 获取演示文稿中的所有幻灯片的标题　　　　　　　　　 　　　　　　 https://msdn.microsoft.com/zh-cn/library/cc536290.aspx PresentationDocument 方法

　　示例代码里大部分说的挺清楚的~在此基础上可以获取一个大概的框架。在main函数里call GetSlideTitles(filename)基本就可以跑起来辣

　　运行示例代码的时候发现挂了 = =，报的错是The document cannot be opened because there is an invalid part with an unexpected content type. ...在stackouverflow里发现了一个解决方法，亲测可用。在调用GetSlideTitles之前先调用一次fixPowerPoint，就可以让文件正常打开了。fixPowerPoint代码如下：

LinkedList<string> texts = new LinkedList<string>();

foreach (var paragraph in slidePart.Slide.Descendants<DocumentFormat.OpenXml.Drawing.Paragraph>())
{
StringBuilder allText = new StringBuilder();
foreach(var text in paragraph.Descendants<DocumentFormat.OpenXml.Drawing.Text>())
{
allText.Append(text.Text);
}
if (allText.Length > 0)
{
if (allText.ToString() == titleText.ToString()) ;
else    texts.AddLast(allText.ToString());
}
}

View Code
最后我有一个带有所有ppt名字的text，所以就从里面读取处理完所有的ppt。

写到json格式的文件（最后写了.jl,因为懒)

全部代码：在马赛克里改自己的路径就能用了噗

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Presentation;
using D = DocumentFormat.OpenXml.Drawing;
using System.IO.Packaging;
using System.IO;

namespace getTitle
{
class Program
{

public static void GetSlideTitles(string presentationFile, string store)
{
// Open the presentation as read-only.
using (PresentationDocument presentationDocument =
PresentationDocument.Open(presentationFile, false))
{
GetSlideTitles(presentationDocument, store);
}
}

public static void GetSlideTitles(PresentationDocument presentationDocument, string store)
{
if (presentationDocument == null)
{
throw new ArgumentNullException("presentationDocument");
}

// Get a PresentationPart object from the PresentationDocument object.
PresentationPart presentationPart = presentationDocument.PresentationPart;

if (presentationPart != null &&
presentationPart.Presentation != null)
{
// Get a Presentation object from the PresentationPart object.
Presentation presentation = presentationPart.Presentation;

if (presentation.SlideIdList != null)
{

// Get the title of each slide in the slide order.
foreach (var slideId in presentation.SlideIdList.Elements<SlideId>())
{
SlidePart slidePart = presentationPart.GetPartById(slideId.RelationshipId) as SlidePart;

// Get the slide title.
GetSlide(slidePart, store);

// An empty title can also be added.

}

}

}

}

// Get the title string of the slide.
public static void GetSlide(SlidePart slidePart, string store)
{
if (slidePart == null)
{
throw new ArgumentNullException("presentationDocument");
}

// Declare a paragraph separator.
string titleSeparator = null;

if (slidePart.Slide != null)
{
// Find all the title shapes.
var shapes = from shape in slidePart.Slide.Descendants<Shape>()
where IsTitleShape(shape)
select shape;

StringBuilder titleText = new StringBuilder();

foreach (var shape in shapes)
{
// Get the text in each paragraph in this shape.
foreach (var paragraph in shape.TextBody.Descendants<D.Paragraph>())
{
// Add a line break.
titleText.Append(titleSeparator);

foreach (var text in paragraph.Descendants<D.Text>())
{
titleText.Append(text.Text);
}

titleSeparator = "\n";
}
}
if (titleText.Length == 0)
return;
LinkedList<string> texts = new LinkedList<string>();

foreach (var paragraph in slidePart.Slide.Descendants<DocumentFormat.OpenXml.Drawing.Paragraph>())
{
StringBuilder allText = new StringBuilder();
foreach(var text in paragraph.Descendants<DocumentFormat.OpenXml.Drawing.Text>())
{
allText.Append(text.Text);
}
if (allText.Length > 0)
{
if (allText.ToString() == titleText.ToString()) ;
else    texts.AddLast(allText.ToString());
}
}
if (texts.Count > 0)
{
System.IO.StreamWriter file = new System.IO.StreamWriter(store, true);

file.Write("{\"Title\":\"" + titleText.ToString() + "\",");
file.Write("\"Content\":\"");
string inter = "";
foreach (var text in texts)
{
file.Write(inter + text );
inter = ",";
}
file.WriteLine("\"}");
file.Close();
}

}

return;
}

// Determines whether the shape is a title shape.
private static bool IsTitleShape(Shape shape)
{
var placeholderShape = shape.NonVisualShapeProperties.ApplicationNonVisualDrawingProperties.GetFirstChild<PlaceholderShape>();
if (placeholderShape != null && placeholderShape.Type != null && placeholderShape.Type.HasValue)
{
switch ((PlaceholderValues)placeholderShape.Type)
{
// Any title shape.
case PlaceholderValues.Title:

// A centered title.
case PlaceholderValues.CenteredTitle:
return true;

default:
return false;
}
}
return false;
}
static void Main(string[] args)
{
　　　　　　
string pptlistPath = "【马赛克】";
System.IO.StreamReader pptlist = new System.IO.StreamReader(pptlistPath);
string ppt;
while((ppt = pptlist.ReadLine()) != null)
{
Console.WriteLine(ppt);
string pptname = "【马赛克】" + ppt + ".pptx";
string storepath = "【马赛克】" + ppt + ".jl";

System.IO.StreamWriter file = new System.IO.StreamWriter(storepath, false);
file.Close();
FixPowerpoint(pptname);
GetSlideTitles(pptname, storepath);

}
pptlist.Close();

string input = Console.ReadLine();

}

private static void FixPowerpoint(string fileName)
{
//Opening the package associated with file
Console.WriteLine(fileName);
using (Package wdPackage = Package.Open(fileName, FileMode.Open, FileAccess.ReadWrite))
{
//Uri of the printer settings part
var binPartUri = new Uri("/ppt/printerSettings/printerSettings1.bin", UriKind.Relative);
if (wdPackage.PartExists(binPartUri))
{
//Uri of the presentation part which contains the relationship
var presPartUri = new Uri("/ppt/presentation.xml", UriKind.RelativeOrAbsolute);
var presPart = wdPackage.GetPart(presPartUri);
//Getting the relationship from the URI
var presentationPartRels =
presPart.GetRelationships().Where(a => a.RelationshipType.Equals("http://schemas.openxmlformats.org/officeDocument/2006/relationships/printerSettings",
StringComparison.InvariantCultureIgnoreCase)).SingleOrDefault();
if (presentationPartRels != null)
{
//Delete the relationship
presPart.DeleteRelationship(presentationPartRels.Id);
}

//Delete the part
wdPackage.DeletePart(binPartUri);
}
wdPackage.Close();
}
}
}
}