这是
How can I retrieve images from a .pptx file using MS Open XML SDK?的后续问题
我该如何检索：
> DocumentFormat.OpenXml.Presentation.Picture对象的图像数据？
>图像名称和/或类型？
在比方说,如下：
using (var doc = PresentationDocument.Open(pptx_filename,false)) {
var presentation = doc.PresentationPart.Presentation;
foreach (SlideId slide_id in presentation.SlideIdList) {
SlidePart slide_part = doc.PresentationPart.GetPartById(slide_id.RelationshipId) as SlidePart;
if (slide_part == null || slide_part.Slide == null)
continue;
Slide slide = slide_part.Slide;
foreach (var pic in slide.Descendants<Picture>()) {
// how can one obtain the pic format and image data?
}
}
}
我意识到我有点要求在这里找到烤箱外的答案,但我无法在任何地方找到足够好的文档来自行解决.
解决方法
首先,获取对Picture的ImagePart的引用. ImagePart类提供您要查找的信息.这是一个代码示例：
string fileName = @"c:\temp\myppt.pptx";
using (var doc = PresentationDocument.Open(fileName,false))
{
var presentation = doc.PresentationPart.Presentation;
foreach (SlideId slide_id in presentation.SlideIdList)
{
SlidePart slide_part = doc.PresentationPart.GetPartById(slide_id.RelationshipId) as SlidePart;
if (slide_part == null || slide_part.Slide == null)
continue;
Slide slide = slide_part.Slide;
// from a picture
foreach (var pic in slide.Descendants<Picture>())
{
// First,get relationship id of image
string rId = pic.BlipFill.Blip.Embed.Value;
ImagePart imagePart = (ImagePart)slide.SlidePart.GetPartById(rId);
// Get the original file name.
Console.Out.WriteLine(imagePart.Uri.OriginalString);
// Get the content type (e.g. image/jpeg).
Console.Out.WriteLine("content-type: {0}",imagePart.ContentType);
// GetStream() returns the image data
System.Drawing.Image img = System.Drawing.Image.FromStream(imagePart.GetStream());
// You could save the image to disk using the System.Drawing.Image class
img.Save(@"c:\temp\temp.jpg");
}
}
}
出于同样的原因,您还可以使用以下代码迭代SlidePart的所有ImagePart：
// iterate over the image parts of the slide part
foreach (var imgPart in slide_part.ImageParts)
{
Console.Out.WriteLine("uri: {0}",imgPart.Uri);
Console.Out.WriteLine("content type: {0}",imgPart.ContentType);
}
希望这可以帮助.
