//your code here...// Code Snippet for Exporting Presentations to HTML with Externally Linked Images //[C# Code Sample] /// <summary> /// This class is responsible for making decisions about the resources saved externally. /// It must implement the Aspose.Slides.Export.ILinkEmbedController interface. /// </summary> class LinkController : ILinkEmbedController { static LinkController() { s_templates.Add("image/jpeg", "image-{0}.jpg"); s_templates.Add("image/png", "image-{0}.png"); } /// <summary> /// Default parameterless constructor /// </summary> public LinkController() { m_externalImages = new Dictionary<int, string>(); } /// <summary> /// Creates a class instance and sets the path where generated resource files will be saved to. /// </summary> /// <param name="savePath">Path to the location where generated resource files will be stored.</param> public LinkController(string savePath) :this() { SavePath = savePath; } /// <summary> /// A ILinkEmbedController member /// </summary> public LinkEmbedDecision GetObjectStoringLocation(int id, byte[] entityData, string semanticName, string contentType, string recomendedExtension) { // Here we make the decision about storing images externally. // The id is unique identifier of each object during the whole export operation. string template; // The s_templates dictionary contains content types we are going to store externally and the corresponding file name template. if (s_templates.TryGetValue(contentType, out template)) { // Storing this resource to the export list m_externalImages.Add(id, template); return LinkEmbedDecision.Link; } // All other resources, if any, will be embedded return LinkEmbedDecision.Embed; } /// <summary> /// A ILinkEmbedController member /// </summary> public string GetUrl(int id, int referrer) { // Here we construct the resource reference string to form the tag: <img src="%result%"> // We need to check the dictionary to filter out unnecessary resources. // Along with checking we extract the corresponding file name template. string template; if (m_externalImages.TryGetValue(id, out template)) { // Assuming we are going to store resource files just near the HTML file. // The image tag will look like <img src="image-1.png"> with the appropriate resource Id and extension. var fileUrl = String.Format(template, id); return fileUrl; } // null must be returned for the resources remaining embedded return null; } /// <summary> /// A ILinkEmbedController member /// </summary> public void SaveExternal(int id, byte[] entityData) { // Here we actually save the resource files to disk. // Once again, checking the dictionary. If the id is not found here it is a sign of an error in GetObjectStoringLocation or GetUrl methods. if (m_externalImages.ContainsKey(id)) { // Now we use the file name stored in the dictionary and combine it with a path as required. // Constructing the file name using the stored template and the Id. var fileName = String.Format(m_externalImages[id], id); // Combining with the location directory var filePath = Path.Combine(SavePath ?? String.Empty, fileName); using (var fs = new FileStream(filePath, FileMode.Create)) fs.Write(entityData, 0, entityData.Length); } else throw new Exception("Something is wrong"); } /// <summary> /// Gets or sets the path where generated resource files will be saved to. /// </summary> public string SavePath { get; set; } /// <summary> /// A dictionary to store associations between resource ids and corresponding file names. /// </summary> private readonly Dictionary<int, string> m_externalImages; /// <summary> /// A dictionary to store associations between content types of resources we are going to store externally /// and corresponding file name templates. /// </summary> private static readonly Dictionary<string, string> s_templates = new Dictionary<string, string>(); } //[VB.NET Code Sample] ''' <summary> ''' This class is responsible for making decisions about the resources saved externally. ''' It must implement the Aspose.Slides.Export.ILinkEmbedController interface. ''' </summary> Public Class LinkController Implements ILinkEmbedController Shared Sub New() s_templates.Add("image/jpeg", "image-{0}.jpg") s_templates.Add("image/png", "image-{0}.png") End Sub ''' <summary> ''' Default parameterless constructor ''' </summary> Public Sub New() m_externalImages = New Dictionary(Of Integer, String)() End Sub ''' <summary> ''' Creates a class instance and sets the path where generated resource files will be saved to. ''' </summary> ''' <param name="savePath">Path to the location where generated resource files will be stored.</param> Public Sub New(ByVal savePath As String) Me.New() Me.SavePath = savePath End Sub ''' <summary> ''' A ILinkEmbedController member ''' </summary> Public Function GetObjectStoringLocation(ByVal id As Integer, ByVal entityData() As Byte, ByVal semanticName As String, ByVal contentType As String, ByVal recomendedExtension As String) As LinkEmbedDecision ' Here we make the decision about storing images externally. ' The id is unique identifier of each object during the whole export operation. Dim template As String ' The s_templates dictionary contains content types we are going to store externally and the corresponding file name template. If s_templates.TryGetValue(contentType, template) Then ' Storing this resource to the export list m_externalImages.Add(id, template) Return LinkEmbedDecision.Link End If ' All other resources, if any, will be embedded Return LinkEmbedDecision.Embed End Function ''' <summary> ''' A ILinkEmbedController member ''' </summary> Public Function GetUrl(ByVal id As Integer, ByVal referrer As Integer) As String ' Here we construct the resource reference string to form the tag: <img src="%result%"> ' We need to check the dictionary to filter out unnecessary resources. ' Along with checking we extract the corresponding file name template. Dim template As String If m_externalImages.TryGetValue(id, template) Then ' Assuming we are going to store resource files just near the HTML file. ' The image tag will look like <img src="image-1.png"> with the appropriate resource Id and extension. Dim fileUrl = String.Format(template, id) Return fileUrl End If ' null must be returned for the resources remaining embedded Return Nothing End Function ''' <summary> ''' A ILinkEmbedController member ''' </summary> Public Sub SaveExternal(ByVal id As Integer, ByVal entityData() As Byte) ' Here we actually save the resource files to disk. ' Once again, checking the dictionary. If the id is not found here it is a sign of an error in GetObjectStoringLocation or GetUrl methods. If m_externalImages.ContainsKey(id) Then ' Now we use the file name stored in the dictionary and combine it with a path as required. ' Constructing the file name using the stored template and the Id. Dim fileName = String.Format(m_externalImages(id), id) ' Combining with the location directory Dim filePath = Path.Combine(If((SavePath <> Nothing), SavePath, String.Empty), fileName) Using fs = New FileStream(filePath, FileMode.Create) fs.Write(entityData, 0, entityData.Length) End Using Else Throw New Exception("Something is wrong") End If End Sub ''' <summary> ''' Gets or sets the path where generated resource files will be saved to. ''' </summary> Private privateSavePath As String Public Property SavePath() As String Get Return privateSavePath End Get Set(ByVal value As String) privateSavePath = value End Set End Property ''' <summary> ''' A dictionary to store associations between resource ids and corresponding file names. ''' </summary> Private ReadOnly m_externalImages As Dictionary(Of Integer, String) ''' <summary> ''' A dictionary to store associations between content types of resources we are going to store externally ''' and corresponding file name templates. ''' </summary> Private Shared ReadOnly s_templates As Dictionary(Of String, String) = New Dictionary(Of String, String)() End Class //After writing the LinkController class, now we will use it with HTMLOptions class to export the presentation to HTML having externally linked images using the following code. //[C# Code Sample] using (var pres = new Presentation(@"C:\data\input.pptx")) { var htmlOptions = new HtmlOptions(new LinkController(@"C:\data\out\")); htmlOptions.SlideImageFormat = SlideImageFormat.Svg(new SVGOptions()); // This line is needed to remove the slide title display in HTML. // Comment it out if your prefer slide title displayed. htmlOptions.HtmlFormatter = HtmlFormatter.CreateDocumentFormatter(String.Empty, false); Console.WriteLine("Starting export"); pres.Save(@"C:\data\out\output.html, SaveFormat.Html, htmlOptions); } //[VB.NET Code Sample] Using pres = New Presentation("C:\data\input.pptx") Dim htmlOptions = New HtmlOptions(New LinkController("C:\data\out\")) htmlOptions.SlideImageFormat = SlideImageFormat.Svg(New SVGOptions()) ' This line is needed to remove the slide title display in HTML. ' Comment it out if your prefer slide title displayed. htmlOptions.HtmlFormatter = HtmlFormatter.CreateDocumentFormatter(String.Empty, False) Console.WriteLine("Starting export") pres.Save("C:\data\out\output.html, SaveFormat.Html, htmlOptions);" & ControlChars.CrLf & "}