Programmatically manipulate an Image imbedded inside a DocX document

This example uses DocX to write the text “Hello World” into an Image embedded inside a .docx document.

Note: Make sure the document Input.docx exists and that it contains an Image.

Below is an example Input.docx and Output.docx

Code Snippet

1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Text;
5. using System.Text.RegularExpressions;
6. using Novacode;
7. using System.Drawing;
8. using System.Threading.Tasks;
9. using System.IO;
10. using System.Diagnostics;
11. using System.Drawing.Imaging;
12. namespace testDocX
13. {
14.     class Program
15.     {
16.         static void Main(string[] args)
17.         {
18.             // Open the document Input.docx.
19.             using (DocX document = DocX.Load("Input.docx"))
20.             {
21.                 // Make sure this document has at least one Image.
22.                 if (document.Images.Count() > 0)
23.                 {
24.                     Novacode.Image img = document.Images[0];
25.                     CoolExample(img, "Hello World");
26.                 }
27.  
28.                 else
29.                     Console.WriteLine("The provided document contains no Images.");
30.  
31.                 // Save this document as Output.docx.
32.                 document.SaveAs("Output.docx");
33.             }
34.         }
35.  
36.         // Write the given string into this Image.
37.         private static void CoolExample(Novacode.Image img, string str)
38.         {
39.             // Write "Hello World" into this Image.
40.             Bitmap b = new Bitmap(img.GetStream(FileMode.Open, FileAccess.ReadWrite));
41.  
42.             /*
43.              * Get the Graphics object for this Bitmap.
44.              * The Graphics object provides functions for drawing.
45.              */
46.             Graphics g = Graphics.FromImage(b);
47.  
48.             // Draw the string "Hello World".
49.             g.DrawString
50.             (
51.                 str,
52.                 new Font("Tahoma", 20),
53.                 Brushes.Blue,
54.                 new PointF(0, 0)
55.             );
56.  
57.             // Save this Bitmap back into the document using a Create\Write stream.
58.             b.Save(img.GetStream(FileMode.Create, FileAccess.Write), ImageFormat.Png);
59.         }
60.     }
61. }