如何使用MS Open XML SDK从.pptx文件中检索图像?

时间:2011-08-15 20:00:38

标签: c# .net powerpoint openxml openxml-sdk

我开始尝试使用Open XML SDK 2.0 for Microsoft Office

我目前能够执行某些操作,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,我用这种方式做后者:

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());
}

现在我想在给定的幻灯片中检索嵌入的图像。有没有人知道如何做到这一点,或者可以指向我关于这个主题的一些文档?

2 个答案:

答案 0 :(得分:1)

首先,您需要抓住要从中获取图像的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对象:

Picture imageToRemove = slidePart.Slide.Descendants<Picture>().SingleOrDefault(picture => picture.NonVisualPictureProperties.OuterXml.Contains(imageFileName));

答案 1 :(得分:-1)

从Openxml格式获取图片的最简单方法:

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,您可以手动将扩展名.pptx替换为.zip并解压缩以从媒体文件夹中获取图像。

希望这有帮助。