[英]How can I retrieve some image data and format using MS Open XML SDK?
[英]How can I retrieve images from a .pptx file using MS Open XML SDK?
我开始尝试使用Open XML SDK 2.0 for Microsoft Office 。
我目前能够做某些事情,例如检索每张幻灯片中的所有文本,并获取演示文稿的大小。 例如,我这样做后者:
using (var doc = PresentationDocument.Open(pptx_filename, false)) {
var presentation = doc.PresentationPart.Presentation;
Debug.Print("width: " + (presentation.SlideSize.Cx / 9525.0).ToString());
Debug.Print("height: " + (presentation.SlideSize.Cy / 9525.0).ToString());
}
现在我想检索给定幻灯片中的嵌入图像。 有谁知道如何做到这一点,或者可以向我指出有关该主题的一些文档?
首先,您需要获取要从中获取图像的SlidePart
:
public static SlidePart GetSlidePart(PresentationDocument presentationDocument, int slideIndex)
{
if (presentationDocument == null)
{
throw new ArgumentNullException("presentationDocument", "GetSlidePart Method: parameter presentationDocument is null");
}
// Get the number of slides in the presentation
int slidesCount = CountSlides(presentationDocument);
if (slideIndex < 0 || slideIndex >= slidesCount)
{
throw new ArgumentOutOfRangeException("slideIndex", "GetSlidePart Method: parameter slideIndex is out of range");
}
PresentationPart presentationPart = presentationDocument.PresentationPart;
// Verify that the presentation part and presentation exist.
if (presentationPart != null && presentationPart.Presentation != null)
{
Presentation presentation = presentationPart.Presentation;
if (presentation.SlideIdList != null)
{
// Get the collection of slide IDs from the slide ID list.
var slideIds = presentation.SlideIdList.ChildElements;
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);
return slidePart;
}
}
}
// No slide found
return null;
}
然后您需要根据图像的文件名搜索包含您要查找的图像的Picture
object:
Picture imageToRemove = slidePart.Slide.Descendants<Picture>().SingleOrDefault(picture => picture.NonVisualPictureProperties.OuterXml.Contains(imageFileName));
从 Openxml 格式获取图像的最简单方法:
使用任何 zip 存档库从 pptx 文件的媒体文件夹中提取图像。 这将包含文档中的图像。 同样,您可以手动将 extension.pptx 替换为.zip 并提取以从媒体文件夹中获取图像。
希望这可以帮助。
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