Modified sample

Author: GOPINATH-SF4767

Images/Extract-EMF-Images-In-PPTX/.NET/Extract-EMF-Images/Data/Input.pptx

@@ -1,43 +1,105 @@
-using Syncfusion.Presentation;
-using Syncfusion.Drawing;
+using Syncfusion.Drawing;
+using Syncfusion.Presentation;
 
 public static class Program
 {
+    public static int imageIndex = 0;
+    public static string outputPath = @"Output";
+	
     public static void Main()
     {
         // Open the PowerPoint file as a stream.
-        using (FileStream inputStream = new FileStream(Path.GetFullPath(@"Data/Input.pptx", FileMode.Open, FileAccess.Read))
+        using (FileStream inputStream = new FileStream(Path.GetFullPath(@"Data/Input.pptx"), FileMode.Open, FileAccess.Read))
         {
             // Load the presentation from the stream.
             using (IPresentation presentation = Presentation.Open(inputStream))
             {
-                int imageIndex = 0;
-
-                // Iterate through each slide in the presentation.
-                foreach (ISlide slide in presentation.Slides)
+                // Extract EMF images from Masters and their Layout slides
+                foreach (IMasterSlide master in presentation.Masters)
                 {
-                    // Iterate through each shape in the slide.
-                    foreach (IShape shape in slide.Shapes)
+                    // Process shapes placed on the master slide
+                    foreach (IShape shape in master.Shapes)
+                    {
+                        ProcessShape(shape);
+                    }
+                    // Process shapes placed on each layout slide under this master
+                    foreach (ILayoutSlide layoutSlide in master.LayoutSlides)
                     {
-                        // Check if the shape is an image.
-                        if (shape is IPicture picture && picture.ImageFormat== ImageFormat.Emf)
+                        foreach (IShape shape in layoutSlide.Shapes)
                         {
-                            // Retrieve the raw image data.
-                            byte[] imageData = picture.ImageData;
-
-                            // Proceed only if image data is valid.
-                            if (imageData != null && imageData.Length > 0)
-                            {
-                                // Determine the image format extension.
-                                string extension = picture.ImageFormat.ToString();
-                                string outputPath = Path.Combine($"Output/Slide{slide.SlideNumber}_Image{++imageIndex}.{extension}");
-                                // Save the image data to the specified path.
-                                File.WriteAllBytes(outputPath, imageData);
-                            }
+                            ProcessShape(shape);
                         }
                     }
                 }
+                // Extract EMF images from Normal slides
+                foreach (ISlide slide in presentation.Slides)
+                {
+                    foreach (IShape shape in slide.Shapes)
+                    {
+                        ProcessShape(shape);
+                    }
+                }
             }
         }
     }
-}
+
+    /// <summary>
+    /// Processes a shape: saves EMF images and recurses through group shapes.
+    /// </summary>
+    private static void ProcessShape(IShape shape)
+    {
+        // If the shape is a picture with EMF format
+        if (shape is IPicture picture && picture.ImageFormat == ImageFormat.Emf)
+        {
+            SaveEMFImage(picture);
+        }
+        // Shape is not a picture object, but its FILL contains a picture(Picture Fill)
+        if (shape.Fill != null && shape.Fill.FillType == FillType.Picture)
+        {
+            // Validate bytes exist and check if those bytes represent an EMF file
+            var bytes = shape.Fill.PictureFill.ImageBytes;
+            if (bytes != null && bytes.Length > 0 && IsEmf(bytes))
+            {
+                string filePath = Path.Combine(outputPath, $"Slide_Image_{++imageIndex}.emf");
+                File.WriteAllBytes(filePath, bytes);
+            }
+        }
+
+        // If the shape is a group, process child shapes
+        if (shape is IGroupShape group)
+        {
+            foreach (IShape child in group.Shapes)
+            {
+                ProcessShape(child);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Saves EMF image from the picture shape.
+    /// </summary>
+    private static void SaveEMFImage(IPicture picture)
+    {
+        byte[] imageData = picture.ImageData;
+
+        if (imageData != null && imageData.Length > 0)
+        {
+            string extension = picture.ImageFormat.ToString().ToLower();
+            string filePath = Path.Combine(outputPath, $"Slide_Image_{++imageIndex}.{extension}");
+            File.WriteAllBytes(filePath, imageData);
+        }
+    }
+	
+    /// <summary>
+    /// Checks whether the given byte[] looks like an EMF file.
+    /// </summary>
+    private static bool IsEmf(byte[] bytes)
+    {
+        if (bytes == null || bytes.Length < 44) return false;
+
+        // EMF signature " EMF" = 0x20 0x45 0x4D 0x46 (little endian uint32 => 0x464D4520)
+        // At offset 40..43
+        uint signature = BitConverter.ToUInt32(bytes, 40);
+        return signature == 0x464D4520;
+    }
+}