c# - 使用 OpenXML 将图像插入 DocX 并设置大小

Question

我正在使用 OpenXML 将图像插入到我的文档中。 Microsoft 提供的代码可以工作，但会使图像变小:

public static void InsertAPicture(string document, string fileName)
        {
            using (WordprocessingDocument wordprocessingDocument = WordprocessingDocument.Open(document, true))
            {
                MainDocumentPart mainPart = wordprocessingDocument.MainDocumentPart;

                ImagePart imagePart = mainPart.AddImagePart(ImagePartType.Jpeg);

                using (FileStream stream = new FileStream(fileName, FileMode.Open))
                {
                    imagePart.FeedData(stream);
                }

                AddImageToBody(wordprocessingDocument, mainPart.GetIdOfPart(imagePart));
            }
        }
        private static void AddImageToBody(WordprocessingDocument wordDoc, string relationshipId)
        {
            // Define the reference of the image.
            var element =
                 new Drawing(
                     new DW.Inline(
                         new DW.Extent() { Cx = 990000L, Cy = 792000L },
                         new DW.EffectExtent()
                         {
                             LeftEdge = 0L,
                             TopEdge = 0L,
                             RightEdge = 0L,
                             BottomEdge = 0L
                         },
                         new DW.DocProperties()
                         {
                             Id = (UInt32Value)1U,
                             Name = "Picture 1"
                         },
                         new DW.NonVisualGraphicFrameDrawingProperties(
                             new A.GraphicFrameLocks() { NoChangeAspect = true }),
                         new A.Graphic(
                             new A.GraphicData(
                                 new PIC.Picture(
                                     new PIC.NonVisualPictureProperties(
                                         new PIC.NonVisualDrawingProperties()
                                         {
                                             Id = (UInt32Value)0U,
                                             Name = "New Bitmap Image.jpg"
                                         },
                                         new PIC.NonVisualPictureDrawingProperties()),
                                     new PIC.BlipFill(
                                         new A.Blip(
                                             new A.BlipExtensionList(
                                                 new A.BlipExtension()
                                                 {
                                                     Uri =
                                                       "{28A0092B-C50C-407E-A947-70E740481C1C}"
                                                 })
                                         )
                                         {
                                             Embed = relationshipId,
                                             CompressionState = A.BlipCompressionValues.Print
                                         },
                                         new A.Stretch(
                                             new A.FillRectangle())),
                                     new PIC.ShapeProperties(
                                         new A.Transform2D(
                                             new A.Offset() { X = 0L, Y = 0L },
                                             new A.Extents() { Cx = 990000L, Cy = 792000L }),
                                         new A.PresetGeometry(
                                             new A.AdjustValueList()
                                         ) { Preset = A.ShapeTypeValues.Rectangle }))
                             ) { Uri = "http://schemas.openxmlformats.org/drawingml/2006/picture" })
                     )
                     {
                         DistanceFromTop = (UInt32Value)0U,
                         DistanceFromBottom = (UInt32Value)0U,
                         DistanceFromLeft = (UInt32Value)0U,
                         DistanceFromRight = (UInt32Value)0U,
                         EditId = "50D07946"
                     });

            // Append the reference to body, the element should be in a Run.
            wordDoc.MainDocumentPart.Document.Body.AppendChild(new Paragraph(new Run(element)));
        }

我需要将图像设为原始大小。我怎样才能做到这一点？ (我用谷歌搜索了如何在此过程之外执行此操作，但这不是我要找的。我必须假设给定代码中有某种大小属性)。

编辑:更新代码(仍然不工作)

public static void InsertAPicture(string document, string fileName)
{
    using (WordprocessingDocument wordprocessingDocument = WordprocessingDocument.Open(document, true))
    {
        MainDocumentPart mainPart = wordprocessingDocument.MainDocumentPart;

        ImagePart imagePart = mainPart.AddImagePart(ImagePartType.Jpeg);

        using (FileStream stream = new FileStream(fileName, FileMode.Open))
        {
            imagePart.FeedData(stream);
        }

        AddImageToBody(wordprocessingDocument, mainPart.GetIdOfPart(imagePart), fileName);
    }
}
private static void AddImageToBody(WordprocessingDocument wordDoc, string relationshipId, string fileName)
{

    var img = new BitmapImage(new Uri(fileName, UriKind.RelativeOrAbsolute));
    var widthPx = img.PixelWidth;
    var heightPx = img.PixelHeight;
    var horzRezDpi = img.DpiX;
    var vertRezDpi = img.DpiY;
    const int emusPerInch = 914400;
    const int emusPerCm = 360000;
    var maxWidthCm = 16.51;
    var widthEmus = (long)(widthPx / horzRezDpi * emusPerInch);
    var heightEmus = (long)(heightPx / vertRezDpi * emusPerInch);
    var maxWidthEmus = (long)(maxWidthCm * emusPerCm);
    if (widthEmus > maxWidthEmus)
    {
        var ratio = (heightEmus * 1.0m) / widthEmus;
        widthEmus = maxWidthEmus;
        heightEmus = (long)(widthEmus * ratio);
    }

    // Define the reference of the image.
    var element =
         new Drawing(
             new DW.Inline(
                 new DW.Extent() { Cx = 990000L, Cy = 792000L },
                 new DW.EffectExtent()
                 {
                     LeftEdge = 0L,
                     TopEdge = 0L,
                     RightEdge = 0L,
                     BottomEdge = 0L
                 },
                 new DW.DocProperties()
                 {
                     Id = (UInt32Value)1U,
                     Name = "Picture 1"
                 },
                 new DW.NonVisualGraphicFrameDrawingProperties(
                     new A.GraphicFrameLocks() { NoChangeAspect = true }),
                 new A.Graphic(
                     new A.GraphicData(
                         new PIC.Picture(
                             new PIC.NonVisualPictureProperties(
                                 new PIC.NonVisualDrawingProperties()
                                 {
                                     Id = (UInt32Value)0U,
                                     Name = "New Bitmap Image.jpg"
                                 },
                                 new PIC.NonVisualPictureDrawingProperties()),
                             new PIC.BlipFill(
                                 new A.Blip(
                                     new A.BlipExtensionList(
                                         new A.BlipExtension()
                                         {
                                             Uri =
                                               "{28A0092B-C50C-407E-A947-70E740481C1C}"
                                         })
                                 )
                                 {
                                     Embed = relationshipId,
                                     CompressionState = A.BlipCompressionValues.Print
                                 },
                                 new A.Stretch(
                                     new A.FillRectangle())),
                             new PIC.ShapeProperties(
                                 new A.Transform2D(
                                     new A.Offset() { X = 0L, Y = 0L },
                                     new A.Extents() { Cx = widthEmus, Cy = heightEmus }),
                                 new A.PresetGeometry(
                                     new A.AdjustValueList()
                                 ) { Preset = A.ShapeTypeValues.Rectangle }))
                     ) { Uri = "http://schemas.openxmlformats.org/drawingml/2006/picture" })
             )
             {
                 DistanceFromTop = (UInt32Value)0U,
                 DistanceFromBottom = (UInt32Value)0U,
                 DistanceFromLeft = (UInt32Value)0U,
                 DistanceFromRight = (UInt32Value)0U,
                 EditId = "50D07946"
             });

    // Append the reference to body, the element should be in a Run.
    wordDoc.MainDocumentPart.Document.Body.AppendChild(new Paragraph(new Run(element)));
}

Answer 1

EMU 中的大小 (English Metric Unit -- read this for a good explanation) 在范围(Cx 和 Cy)中设置。为了将图片放入 DocX，我通常这样做:

1. 获取图片的尺寸和分辨率
2. 计算 EMU 中的图像宽度:wEmu = imgWidthPixels/imgHorizo​​ntalDpi * emuPerInch
3. 计算 EMU 中的图像高度:hEmu = imgHeightPixels/imgVerticalDpi * emuPerInch
4. 计算 EMU 中的最大页面宽度(我发现如果图像太宽，则不会显示)

5. 如果 EMU 中的图像宽度大于最大页面宽度，我会缩放图像的宽度和高度，使图像的宽度等于页面的宽度(当我说页面时，我指的是到“可用”页面，即减去边距):

   var ratio = hEmu/wEmu;
wEmu = maxPageWidthEmu;
hEmu = wEmu * 比率;

6. 然后我将宽度用作 Cx 的值，将高度用作 Cy 的值，两者 在 DW.Extent 和 中A.Extents(PIC.ShapeProperties 的 A.Transform2D)。

请注意，emuPerInch 值为 914400。
我有这个运行(在服务中)，但我现在没有代码。

更新

这是我使用的代码:

var img = new BitmapImage(new Uri(fileName, UriKind.RelativeOrAbsolute));
var widthPx = img.PixelWidth;
var heightPx = img.PixelHeight;
var horzRezDpi = img.DpiX;
var vertRezDpi = img.DpiY;
const int emusPerInch = 914400;
const int emusPerCm = 360000;
var widthEmus = (long)(widthPx / horzRezDpi * emusPerInch);
var heightEmus = (long)(heightPx / vertRezDpi * emusPerInch);
var maxWidthEmus = (long)(maxWidthCm * emusPerCm);
if (widthEmus > maxWidthEmus) {
  var ratio = (heightEmus * 1.0m) / widthEmus;
  widthEmus = maxWidthEmus;
  heightEmus = (long)(widthEmus * ratio);
}

在我的例子中，我的页面尺寸以厘米为单位，因此您在上面看到的是 emusPerCm。

更新 2(回答@andw)

要在尽可能短的时间内锁定文件，请使用 FileStream 打开它，并将生成的流传递给 BitmapImage StreamSource 属性:

var img = new BitmapImage();
using (var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read)) {
    img.BeginInit();
    img.StreamSource = fs;
    img.EndInit();
}
// The file is now unlocked
var widthPx = img.PixelWidth;
...