Word 互操作 - 将嵌入的形状另存为图像

Question

我正在尝试使用 C# 将嵌入的 shape 保存为图像。

如果对象嵌入为实际图像 (WMF/JPEG)，我可以毫无问题地检索图像，但是当对象是嵌入形状或在 Word 中显示为图像的 OLE 对象时，我似乎无法提取或检索然后将所述对象复制到剪贴板或保存所述图像。

这是我当前的代码示例；要么对象为空，要么出现以下错误：

System.Runtime.InteropServices.ExternalException: 'A generic error occurred in GDI+.'

感谢任何帮助。谢谢

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace ImageMagickSandboxWinForms
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }

        public static BitmapSource ConvertBitmap(Bitmap source)
        {
            return System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                          source.GetHbitmap(),
                          IntPtr.Zero,
                          Int32Rect.Empty,
                          BitmapSizeOptions.FromEmptyOptions());
        }

        public static Bitmap BitmapFromSource(BitmapSource bitmapsource)
        {
            Bitmap bitmap;
            using (var outStream = new MemoryStream())
            {
                BitmapEncoder enc = new BmpBitmapEncoder();
                enc.Frames.Add(BitmapFrame.Create(bitmapsource));
                enc.Save(outStream);
                bitmap = new Bitmap(outStream);
            }
            return bitmap;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string physicsDocLocation = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop));
            physicsDocLocation += @"\[Doc path Here].docx";
            var wordApp = new Microsoft.Office.Interop.Word.Application();

            var wordDoc = wordApp.Documents.Open(physicsDocLocation);
            int iCount = wordDoc.InlineShapes.Count;
            for (int i = 1; i < (wordDoc.InlineShapes.Count + 1); i++)
            {
                var currentInlineShape = wordDoc.InlineShapes[i];
                currentInlineShape.Range.Select();
                wordDoc.ActiveWindow.Selection.Range.Copy();
                BitmapSource clipBoardImage = System.Windows.Clipboard.GetImage();
                Bitmap bmpClipImage = BitmapFromSource(clipBoardImage);
                string finalPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), @"TestConversions");
                finalPath += @"\" + Guid.NewGuid().ToString() + ".jpg";
                using (MemoryStream memory = new MemoryStream())
                {
                    using (FileStream fs = new FileStream(finalPath, FileMode.Create, FileAccess.ReadWrite))
                    {
                        bmpClipImage.Save(memory, ImageFormat.Jpeg); <<<---- Error happens here.
                        byte[] bytes = memory.ToArray();
                        fs.Write(bytes, 0, bytes.Length);
                    }
                }
            }
            wordDoc.Close();
            wordApp.Quit();
        }
    }
}

Answer 1

我的库中有这些代码，不知道我在哪里找到的，但希望你为你完成这项工作：我正在使用剪贴板来捕获不同的图像，只是不要忘记，访问剪贴板需要线程

       for (var i = 1; i <= wordApplication.ActiveDocument.InlineShapes.Count; i++)
        {

            var inlineShapeId = i; 


            var thread = new Thread(() => SaveInlineShapeToFile(inlineShapeId, wordApplication));

            // STA is needed in order to access the clipboard
            // https://stackoverflow.com/a/518724/700926
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();
            thread.Join();
        }

   // General idea is based on: https://stackoverflow.com/a/7937590/700926
    protected static void SaveInlineShapeToFile(int inlineShapeId, Application wordApplication)
    {
        // Get the shape, select, and copy it to the clipboard
        var inlineShape = wordApplication.ActiveDocument.InlineShapes[inlineShapeId];
        inlineShape.Select();
        wordApplication.Selection.Copy();

        // Check data is in the clipboard
        if (Clipboard.GetDataObject() != null)
        {
            var data = Clipboard.GetDataObject();

            // Check if the data conforms to a bitmap format
            if (data != null && data.GetDataPresent(DataFormats.Bitmap))
            {
                // Fetch the image and convert it to a Bitmap
                var image = (Image) data.GetData(DataFormats.Bitmap, true);
                var currentBitmap = new Bitmap(image);

                // Save the bitmap to a file
                currentBitmap.Save(@"C:\Users\Username\Documents\" + String.Format("img_{0}.png", inlineShapeId));
            }
        }
    }

如果您使用的是 Winform 或 WPF，则剪贴板对图像的作用会有所不同：

if (Clipboard.ContainsImage())
{
// ImageUIElement.Source = Clipboard.GetImage(); // does not work
    System.Windows.Forms.IDataObject clipboardData = System.Windows.Forms.Clipboard.GetDataObject();
  if (clipboardData != null)
  {
    if (clipboardData.GetDataPresent(System.Windows.Forms.DataFormats.Bitmap))
    {
        System.Drawing.Bitmap bitmap = (System.Drawing.Bitmap)clipboardData.GetData(System.Windows.Forms.DataFormats.Bitmap);
        ImageUIElement.Source =  System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(bitmap.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,BitmapSizeOptions.FromEmptyOptions());
        Console.WriteLine("Clipboard copied to UIElement");
    }
  }
}

如果由于格式转换中的错误而无法正常工作，则有此 solution 。所以它很简单，但很容易理解“DeviceIndependentBitmap”的使用逻辑