Inserting image in PPTX using OpenXML does not work - image

Question

I am trying to generate a PowerPoint file containing a image using OpenXML. Unfortunately it does not work. The image is not being displayed. I've checked the file generated with the OpenXML productivity tool and I respectively unzipped the file contents. The file itself contains the image in /ppt/media/image.png and it should be displayed in the second slide.
Here's my code:
private void InsertSlide(string chartString, int position, string title, string text = "")
{
if (m_presentation == null || title == null || m_presentation.PresentationPart == null)
return;
var slide = new Slide(new CommonSlideData(new ShapeTree()));
var nonVisualProperties =
slide.CommonSlideData.ShapeTree.AppendChild(new NonVisualGroupShapeProperties());
nonVisualProperties.NonVisualDrawingProperties = new NonVisualDrawingProperties { Id = 1, Name = "" };
nonVisualProperties.NonVisualGroupShapeDrawingProperties = new NonVisualGroupShapeDrawingProperties();
nonVisualProperties.ApplicationNonVisualDrawingProperties = new ApplicationNonVisualDrawingProperties();
slide.CommonSlideData.ShapeTree.AppendChild(new GroupShapeProperties());
var slidePart = m_presentation.PresentationPart.AddNewPart<SlidePart>();
var imagePart = slidePart.AddImagePart(ImagePartType.Png, "irgendeinscheiss");
//var imageStream = new MemoryStream(Convert.FromBase64String(chartString));
using (var imageStream = new FileStream(#"C:\Users\DA\Desktop\Charts\1_Chart2_01.png", FileMode.Open))
{
imageStream.Position = 0;
imagePart.FeedData(imageStream);
}
slide.Save(slidePart);
var slideIdList = m_presentation.PresentationPart.Presentation.SlideIdList;
uint maxSlideId = 1;
SlideId prevSlideId = null;
foreach (SlideId slideId in slideIdList.ChildElements)
{
if (slideId.Id > maxSlideId)
maxSlideId = slideId.Id;
position--;
if (position == 0)
prevSlideId = slideId;
}
maxSlideId++;
SlidePart lastSlidePart;
if (prevSlideId != null)
lastSlidePart = (SlidePart)m_presentation.PresentationPart.GetPartById(prevSlideId.RelationshipId);
else
lastSlidePart = (SlidePart)m_presentation.PresentationPart.GetPartById(((SlideId)(slideIdList.ChildElements[0])).RelationshipId);
if (lastSlidePart.SlideLayoutPart != null)
slidePart.AddPart(lastSlidePart.SlideLayoutPart);
var newSlideId = slideIdList.InsertAfter(new SlideId(), prevSlideId);
newSlideId.Id = maxSlideId;
newSlideId.RelationshipId = m_presentation.PresentationPart.GetIdOfPart(slidePart);
m_presentation.PresentationPart.Presentation.Save();
}
Am I missing something? Maybe the relationships? After looking up 232243 thousand different examples, I am still stuck at this point. Thank you!

Answer 1

I think you need to add the image into the slide.CommonSlideData
public Slide InsertSlide(PresentationPart presentationPart, string layoutName)
{
UInt32 slideId = 256U;
// Get the Slide Id collection of the presentation document
var slideIdList = presentationPart.Presentation.SlideIdList;
if (slideIdList == null)
{
throw new NullReferenceException("The number of slide is empty, please select a ppt with a slide at least again");
}
slideId += Convert.ToUInt32(slideIdList.Count());
// Creates an Slide instance and adds its children.
Slide slide = new Slide(new CommonSlideData(new ShapeTree()));
SlidePart slidePart = presentationPart.AddNewPart<SlidePart>();
slide.Save(slidePart);
// Get SlideMasterPart and SlideLayoutPart from the existing Presentation Part
SlideMasterPart slideMasterPart = presentationPart.SlideMasterParts.First();
SlideLayoutPart slideLayoutPart = slideMasterPart.SlideLayoutParts.SingleOrDefault
(sl => sl.SlideLayout.CommonSlideData.Name.Value.Equals(layoutName, StringComparison.OrdinalIgnoreCase));
if (slideLayoutPart == null)
{
throw new Exception("The slide layout " + layoutName + " is not found");
}
slidePart.AddPart<SlideLayoutPart>(slideLayoutPart);
slidePart.Slide.CommonSlideData = (CommonSlideData)slideMasterPart.SlideLayoutParts.SingleOrDefault(
sl => sl.SlideLayout.CommonSlideData.Name.Value.Equals(layoutName)).SlideLayout.CommonSlideData.Clone();
// Create SlideId instance and Set property
SlideId newSlideId = presentationPart.Presentation.SlideIdList.AppendChild<SlideId>(new SlideId());
newSlideId.Id = slideId;
newSlideId.RelationshipId = presentationPart.GetIdOfPart(slidePart);
return GetSlideByRelationShipId(presentationPart, newSlideId.RelationshipId);
}
/// <summary>
/// Get Slide By RelationShip ID
/// </summary>
/// <param name="presentationPart">Presentation Part</param>
/// <param name="relationshipId">Relationship ID</param>
/// <returns>Slide Object</returns>
private static Slide GetSlideByRelationShipId(PresentationPart presentationPart, StringValue relationshipId)
{
// Get Slide object by Relationship ID
SlidePart slidePart = presentationPart.GetPartById(relationshipId) as SlidePart;
if (slidePart != null)
{
return slidePart.Slide;
}
else
{
return null;
}
}
Public void InsertImageInLastSlide(Slide slide, string imagePath, string imageExt)
{
// Creates an Picture instance and adds its children.
P.Picture picture = new P.Picture();
string embedId = string.Empty;
embedId = "rId" + (slide.Elements().Count() + 915).ToString();
P.NonVisualPictureProperties nonVisualPictureProperties = new P.NonVisualPictureProperties(
new P.NonVisualDrawingProperties() { Id = (UInt32Value)4U, Name = "Picture 5" },
new P.NonVisualPictureDrawingProperties(new A.PictureLocks() { NoChangeAspect = true }),
new ApplicationNonVisualDrawingProperties());
P.BlipFill blipFill = new P.BlipFill();
Blip blip = new Blip() { Embed = embedId };
// Creates an BlipExtensionList instance and adds its children
BlipExtensionList blipExtensionList = new BlipExtensionList();
BlipExtension blipExtension = new BlipExtension() { Uri = "{28A0092B-C50C-407E-A947-70E740481C1C}" };
UseLocalDpi useLocalDpi = new UseLocalDpi() { Val = false };
useLocalDpi.AddNamespaceDeclaration("a14",
"http://schemas.microsoft.com/office/drawing/2010/main");
blipExtension.Append(useLocalDpi);
blipExtensionList.Append(blipExtension);
blip.Append(blipExtensionList);
Stretch stretch = new Stretch();
FillRectangle fillRectangle = new FillRectangle();
stretch.Append(fillRectangle);
blipFill.Append(blip);
blipFill.Append(stretch);
// Creates an ShapeProperties instance and adds its children.
P.ShapeProperties shapeProperties = new P.ShapeProperties();
A.Transform2D transform2D = new A.Transform2D();
A.Offset offset = new A.Offset() { X = 457200L, Y = 1524000L };
A.Extents extents = new A.Extents() { Cx = 8229600L, Cy = 5029200L };
transform2D.Append(offset);
transform2D.Append(extents);
A.PresetGeometry presetGeometry = new A.PresetGeometry() { Preset = A.ShapeTypeValues.Rectangle };
A.AdjustValueList adjustValueList = new A.AdjustValueList();
presetGeometry.Append(adjustValueList);
shapeProperties.Append(transform2D);
shapeProperties.Append(presetGeometry);
picture.Append(nonVisualPictureProperties);
picture.Append(blipFill);
picture.Append(shapeProperties);
slide.CommonSlideData.ShapeTree.AppendChild(picture);
// Generates content of imagePart.
ImagePart imagePart = slide.SlidePart.AddNewPart<ImagePart>(imageExt, embedId);
FileStream fileStream = new FileStream(imagePath, FileMode.Open);
imagePart.FeedData(fileStream);
fileStream.Close();
}
Source Code