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:

1. 　　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 
2. 　　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：

        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();
            }
        }

接下来加入提取文本的地方，DocumentFormat.OpenXml.Drawing.Paragraph可以抓出paragraph，DocumentFormat.OpenXml.Drawing.Text抓出text，核心基本是这样的。

                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());
                    }
                }

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 = "
";
                    }
                }
                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();
            }
        }
    }
}