992103-How to extract an .EMF images from the PPTX file

Images/Extract-EMF-Images-In-PPTX/.NET/Extract-EMF-Images.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.35327.3
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Extract-EMF-Images", "Extract-EMF-Images\Extract-EMF-Images.csproj", "{82E919F2-6EA6-4E54-BF73-9D3133B56F4A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{82E919F2-6EA6-4E54-BF73-9D3133B56F4A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{82E919F2-6EA6-4E54-BF73-9D3133B56F4A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{82E919F2-6EA6-4E54-BF73-9D3133B56F4A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{82E919F2-6EA6-4E54-BF73-9D3133B56F4A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {446047E7-FDD0-4F0E-A910-B67785529857}
+	EndGlobalSection
+EndGlobal

Images/Extract-EMF-Images-In-PPTX/.NET/Extract-EMF-Images/Extract-EMF-Images.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Extract_EMF_Images</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.PresentationRenderer.Net.Core" Version="*" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Update="Data\Input.pptx">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Output\.gitkeep">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+</Project>

Images/Extract-EMF-Images-In-PPTX/.NET/Extract-EMF-Images/Output/gitkeep.txt

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+

Images/Extract-EMF-Images-In-PPTX/.NET/Extract-EMF-Images/Program.cs

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+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))
+        {
+            // Load the presentation from the stream.
+            using (IPresentation presentation = Presentation.Open(inputStream))
+            {
+                // Extract EMF images from Masters and their Layout slides
+                foreach (IMasterSlide master in presentation.Masters)
+                {
+                    // 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)
+                    {
+                        foreach (IShape shape in layoutSlide.Shapes)
+                        {
+                            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;
+    }
+}