使用OpenXML sdk调整DocX中的现有图像大小

时间:2016-01-16 14:28:11

标签: c# openxml docx openxml-sdk

获得模板docx,图像占位符替换为正确的图片。

private void SetImagePartData(ImagePart imagePart, byte[] data)
{
    if (imagePart != null)
    {
        using (var writer = new BinaryWriter(imagePart.GetStream()))
        {
            writer.Write(data);
        }
    }
}

但它保留了占位符大小。如何将其更改为实际图像大小?字节数组与服务器上的图像有关,因此大小已知。

1 个答案:

答案 0 :(得分:4)

如果您的意思是使用占位符进行内容控制,则可以使用以下代码:

//Get SdtElement (can be a block, run... so I use the base class) with corresponding Tag
SdtElement block = doc.MainDocumentPart.Document.Body.Descendants<SdtElement>()
  .FirstOrDefault(sdt => sdt.SdtProperties.GetFirstChild<Tag>()?.Val == contentControlTag);

//Get First drawing Element and get the original sizes of placeholder SDT
//I use SDT placeholder size as maximum size to calculate picture size with correct ratios
Drawing sdtImage = block.Descendants<Drawing>().First();
double sdtWidth = sdtImage.Inline.Extent.Cx;
double sdtHeight = sdtImage.Inline.Extent.Cy;
double sdtRatio = sdtWidth / sdtHeight;

*Calculate final width/height of image*

//Resize picture placeholder
sdtImage.Inline.Extent.Cx = finalWidth;
sdtImage.Inline.Extent.Cy = finalHeight;

//Change width/height of picture shapeproperties Transform
//This will override above height/width until you manually drag image for example
sdtImage.Inline.Graphic.GraphicData
    .GetFirstChild<DocumentFormat.OpenXml.Drawing.Pictures.Picture>()
    .ShapeProperties.Transform2D.Extents.Cx = finalWidth;
sdtImage.Inline.Graphic.GraphicData
    .GetFirstChild<DocumentFormat.OpenXml.Drawing.Pictures.Picture>()
    .ShapeProperties.Transform2D.Extents.Cy = finalHeight;

但如果您只是在word文档中使用图像,则可以使用它。您只需找到包含对imagepart的引用的正确Drawing元素。然后,您可以使用代码的底部来调整图像大小。同样重要的是调整Transform2D x和y以及Inline x和y,或者图像尺寸不会被更改。