将 OLE 对象从一张幻灯片复制到另一张幻灯片会损坏生成的 PowerPoint
Copying OLE Objects from one slide to another corrupts the resulting PowerPoint
我有将一张 PowerPoint 幻灯片的内容复制到另一张幻灯片的代码。以下是图像处理方式的示例。
foreach (OpenXmlElement element in sourceSlide.CommonSlideData.ShapeTree.ChildElements.ToList())
{
string elementType = element.GetType().ToString();
if (elementType.EndsWith(".Picture"))
{
// Deep clone the element.
elementClone = element.CloneNode(true);
var picture = (Picture)elementClone;
// Get the picture's original rId
var blip = picture.BlipFill.Blip;
string rId = blip.Embed.Value;
// Retrieve the ImagePart from the original slide by rId
ImagePart sourceImagePart = (ImagePart)sourceSlide.SlidePart.GetPartById(rId);
// Add the image part to the new slide, letting OpenXml generate the new rId
ImagePart targetImagePart = targetSlidePart.AddImagePart(sourceImagePart.ContentType);
// And copy the image data.
targetImagePart.FeedData(sourceImagePart.GetStream());
// Retrieve the new ID from the target image part,
string id = targetSlidePart.GetIdOfPart(targetImagePart);
// and assign it to the picture.
blip.Embed.Value = id;
// Get the shape tree that we're adding the clone to and append to it.
ShapeTree shapeTree = targetSlide.CommonSlideData.ShapeTree;
shapeTree.Append(elementClone);
}
这段代码工作正常。对于Graphic Frames等其他场景，它看起来有点不同，因为每个Graphic frame可以包含多个图片对象。
// Go thru all the Picture objects in this GraphicFrame.
foreach (var sourcePicture in element.Descendants<Picture>())
{
string rId = sourcePicture.BlipFill.Blip.Embed.Value;
ImagePart sourceImagePart = (ImagePart)sourceSlide.SlidePart.GetPartById(rId);
var contentType = sourceImagePart.ContentType;
var targetPicture = elementClone.Descendants<Picture>().First(x => x.BlipFill.Blip.Embed.Value == rId);
var targetBlip = targetPicture.BlipFill.Blip;
ImagePart targetImagePart = targetSlidePart.AddImagePart(contentType);
targetImagePart.FeedData(sourceImagePart.GetStream());
string id = targetSlidePart.GetIdOfPart(targetImagePart);
targetBlip.Embed.Value = id;
}
现在我需要对 OLE 对象做同样的事情。
// Go thru all the embedded objects in this GraphicFrame.
foreach (var oleObject in element.Descendants<OleObject>())
{
// Get the rId of the embedded OLE object.
string rId = oleObject.Id;
// Get the EmbeddedPart from the source slide.
var embeddedOleObj = sourceSlide.SlidePart.GetPartById(rId);
// Get the content type.
var contentType = embeddedOleObj.ContentType;
// Create the Target Part. Let OpenXML assign an rId.
var targetObjectPart = targetSlide.SlidePart.AddNewPart<EmbeddedObjectPart>(contentType, null);
// Get the embedded OLE object data from the original object.
var objectStream = embeddedOleObj.GetStream();
// And give it to the ObjectPart.
targetObjectPart.FeedData(objectStream);
// Get the new rId and assign it to the OLE Object.
string id = targetSlidePart.GetIdOfPart(targetObjectPart);
oleObject.Id = id;
}
但是没有用。生成的 PowerPoint 已损坏。
我做错了什么？
注意： 除 OLE 对象中的 rId 处理外，所有代码均有效。我知道它有效，因为如果我只是将原始 rId 从源对象传递到目标对象部分，就像这样：
var targetObjectPart = targetSlide.SlidePart
.AddNewPart<EmbeddedObjectPart>(contentType, rId);
它将正常运行，只要目标幻灯片中不存在 rId， 显然不会像我需要的那样每次都运行到.
源幻灯片和目标幻灯片来自不同的 PPTX 文件。我们使用的是 OpenXML，而不是 Office Interop。
由于您没有提供完整的代码，所以很难判断哪里出了问题。
我的猜测是您没有修改正确的对象。
在您的图片代码示例中，您正在创建和修改 elementClone。
在您的 ole 对象的代码示例中，您正在使用和修改 oleObject（它是 element 的后代）并且从上下文中并不清楚它是否是源文档的一部分或目标文件。
您可以试试这个最小的例子：
- 为
c:\testdata\input.pptx 使用带有一个嵌入 ole 对象的新 pptx
- 为
c:\testdata\output.pptx 使用新的 pptx（空白）
在 运行 代码之后，我能够在输出文档中打开嵌入的 ole 对象。
using DocumentFormat.OpenXml.Presentation;
using DocumentFormat.OpenXml.Packaging;
using System.Linq;
namespace ooxml
{
class Program
{
static void Main(string[] args)
{
CopyOle("c:\testdata\input.pptx", "c:\testdata\output.pptx");
}
private static void CopyOle(string inputFile, string outputFile)
{
using (PresentationDocument sourceDocument = PresentationDocument.Open(inputFile, true))
{
using (PresentationDocument targetDocument = PresentationDocument.Open(outputFile, true))
{
var sourceSlidePart = sourceDocument.PresentationPart.SlideParts.First();
var targetSlidePart = targetDocument.PresentationPart.SlideParts.First();
foreach (var element in sourceSlidePart.Slide.CommonSlideData.ShapeTree.ChildElements)
{
//clones an element, does not copy the actual relationship target (e.g. ppt\embeddings\oleObject1.bin)
var elementClone = element.CloneNode(true);
//for each cloned OleObject, fix its relationship
foreach(var clonedOleObject in elementClone.Descendants<OleObject>())
{
//find the original EmbeddedObjectPart in the source document
//(we can use the id from the clonedOleObject to do that, since it contained the same id
// as the source ole object)
var sourceObjectPart = sourceSlidePart.GetPartById(clonedOleObject.Id);
//create a new EmbeddedObjectPart in the target document and copy the data from the original EmbeddedObjectPart
var targetObjectPart = targetSlidePart.AddEmbeddedObjectPart(sourceObjectPart.ContentType);
targetObjectPart.FeedData(sourceObjectPart.GetStream());
//update the relationship target on the clonedOleObject to point to the newly created EmbeddedObjectPath
clonedOleObject.Id = targetSlidePart.GetIdOfPart(targetObjectPart);
}
//add cloned element to the document
targetSlidePart.Slide.CommonSlideData.ShapeTree.Append(elementClone);
}
targetDocument.PresentationPart.Presentation.Save();
}
}
}
}
}
至于故障排除，OOXML Tools chrome 扩展很有帮助。
它允许比较两个文档的结构，因此更容易分析哪里出了问题。
示例：
- 如果您只克隆所有元素，您会发现 /ppt/embeddings/* 和 /ppt/media/* 会丢失
- 或者您可以检查关系是否正确（例如，输入文档使用“rId1”来引用嵌入数据，输出文档使用“R3a2fa0c37eaa42b5”）
我有将一张 PowerPoint 幻灯片的内容复制到另一张幻灯片的代码。以下是图像处理方式的示例。
foreach (OpenXmlElement element in sourceSlide.CommonSlideData.ShapeTree.ChildElements.ToList())
{
string elementType = element.GetType().ToString();
if (elementType.EndsWith(".Picture"))
{
// Deep clone the element.
elementClone = element.CloneNode(true);
var picture = (Picture)elementClone;
// Get the picture's original rId
var blip = picture.BlipFill.Blip;
string rId = blip.Embed.Value;
// Retrieve the ImagePart from the original slide by rId
ImagePart sourceImagePart = (ImagePart)sourceSlide.SlidePart.GetPartById(rId);
// Add the image part to the new slide, letting OpenXml generate the new rId
ImagePart targetImagePart = targetSlidePart.AddImagePart(sourceImagePart.ContentType);
// And copy the image data.
targetImagePart.FeedData(sourceImagePart.GetStream());
// Retrieve the new ID from the target image part,
string id = targetSlidePart.GetIdOfPart(targetImagePart);
// and assign it to the picture.
blip.Embed.Value = id;
// Get the shape tree that we're adding the clone to and append to it.
ShapeTree shapeTree = targetSlide.CommonSlideData.ShapeTree;
shapeTree.Append(elementClone);
}
这段代码工作正常。对于Graphic Frames等其他场景，它看起来有点不同，因为每个Graphic frame可以包含多个图片对象。
// Go thru all the Picture objects in this GraphicFrame.
foreach (var sourcePicture in element.Descendants<Picture>())
{
string rId = sourcePicture.BlipFill.Blip.Embed.Value;
ImagePart sourceImagePart = (ImagePart)sourceSlide.SlidePart.GetPartById(rId);
var contentType = sourceImagePart.ContentType;
var targetPicture = elementClone.Descendants<Picture>().First(x => x.BlipFill.Blip.Embed.Value == rId);
var targetBlip = targetPicture.BlipFill.Blip;
ImagePart targetImagePart = targetSlidePart.AddImagePart(contentType);
targetImagePart.FeedData(sourceImagePart.GetStream());
string id = targetSlidePart.GetIdOfPart(targetImagePart);
targetBlip.Embed.Value = id;
}
现在我需要对 OLE 对象做同样的事情。
// Go thru all the embedded objects in this GraphicFrame.
foreach (var oleObject in element.Descendants<OleObject>())
{
// Get the rId of the embedded OLE object.
string rId = oleObject.Id;
// Get the EmbeddedPart from the source slide.
var embeddedOleObj = sourceSlide.SlidePart.GetPartById(rId);
// Get the content type.
var contentType = embeddedOleObj.ContentType;
// Create the Target Part. Let OpenXML assign an rId.
var targetObjectPart = targetSlide.SlidePart.AddNewPart<EmbeddedObjectPart>(contentType, null);
// Get the embedded OLE object data from the original object.
var objectStream = embeddedOleObj.GetStream();
// And give it to the ObjectPart.
targetObjectPart.FeedData(objectStream);
// Get the new rId and assign it to the OLE Object.
string id = targetSlidePart.GetIdOfPart(targetObjectPart);
oleObject.Id = id;
}
但是没有用。生成的 PowerPoint 已损坏。
我做错了什么？
注意： 除 OLE 对象中的 rId 处理外，所有代码均有效。我知道它有效，因为如果我只是将原始 rId 从源对象传递到目标对象部分，就像这样：
var targetObjectPart = targetSlide.SlidePart
.AddNewPart<EmbeddedObjectPart>(contentType, rId);
它将正常运行，只要目标幻灯片中不存在 rId， 显然不会像我需要的那样每次都运行到.
源幻灯片和目标幻灯片来自不同的 PPTX 文件。我们使用的是 OpenXML，而不是 Office Interop。
由于您没有提供完整的代码，所以很难判断哪里出了问题。
我的猜测是您没有修改正确的对象。
在您的图片代码示例中，您正在创建和修改 elementClone。
在您的 ole 对象的代码示例中，您正在使用和修改 oleObject（它是 element 的后代）并且从上下文中并不清楚它是否是源文档的一部分或目标文件。
您可以试试这个最小的例子：
- 为
c:\testdata\input.pptx 使用带有一个嵌入 ole 对象的新 pptx
- 为
c:\testdata\output.pptx 使用新的 pptx（空白）
在 运行 代码之后，我能够在输出文档中打开嵌入的 ole 对象。
using DocumentFormat.OpenXml.Presentation;
using DocumentFormat.OpenXml.Packaging;
using System.Linq;
namespace ooxml
{
class Program
{
static void Main(string[] args)
{
CopyOle("c:\testdata\input.pptx", "c:\testdata\output.pptx");
}
private static void CopyOle(string inputFile, string outputFile)
{
using (PresentationDocument sourceDocument = PresentationDocument.Open(inputFile, true))
{
using (PresentationDocument targetDocument = PresentationDocument.Open(outputFile, true))
{
var sourceSlidePart = sourceDocument.PresentationPart.SlideParts.First();
var targetSlidePart = targetDocument.PresentationPart.SlideParts.First();
foreach (var element in sourceSlidePart.Slide.CommonSlideData.ShapeTree.ChildElements)
{
//clones an element, does not copy the actual relationship target (e.g. ppt\embeddings\oleObject1.bin)
var elementClone = element.CloneNode(true);
//for each cloned OleObject, fix its relationship
foreach(var clonedOleObject in elementClone.Descendants<OleObject>())
{
//find the original EmbeddedObjectPart in the source document
//(we can use the id from the clonedOleObject to do that, since it contained the same id
// as the source ole object)
var sourceObjectPart = sourceSlidePart.GetPartById(clonedOleObject.Id);
//create a new EmbeddedObjectPart in the target document and copy the data from the original EmbeddedObjectPart
var targetObjectPart = targetSlidePart.AddEmbeddedObjectPart(sourceObjectPart.ContentType);
targetObjectPart.FeedData(sourceObjectPart.GetStream());
//update the relationship target on the clonedOleObject to point to the newly created EmbeddedObjectPath
clonedOleObject.Id = targetSlidePart.GetIdOfPart(targetObjectPart);
}
//add cloned element to the document
targetSlidePart.Slide.CommonSlideData.ShapeTree.Append(elementClone);
}
targetDocument.PresentationPart.Presentation.Save();
}
}
}
}
}
至于故障排除，OOXML Tools chrome 扩展很有帮助。
它允许比较两个文档的结构，因此更容易分析哪里出了问题。
示例：
- 如果您只克隆所有元素，您会发现 /ppt/embeddings/* 和 /ppt/media/* 会丢失
- 或者您可以检查关系是否正确（例如，输入文档使用“rId1”来引用嵌入数据，输出文档使用“R3a2fa0c37eaa42b5”）