A sub-optimal yet functional way to do this is round trip using the clipboard. Slide(s) copied to the clipboard are actually packaged up as ppt data (which is just a zip). And you have control over the clipboard and inserting etc slides. So basically:
- Programmatically select and copy the content you want to edit to the clipboard using PP APIs.
- Read "PowerPoint 14.0 Slides Package" part of clipboard data into memory stream.
- Pass/edit memory stream with Open XML.
- Copy memory stream back to clipboard.
- paste back into PP as needed.
Here's an example of steps 2-3 working using this Open XML example as a base that write all text in the first slide in the clipboard to the console:
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;
}
}
}
}
}