CodecsFilterHeartbeatEventArgs Class

Summary

Data for the RasterCodecs.FilterHeartbeat event.

Syntax

C++/CLI

Python

public class CodecsFilterHeartbeatEventArgs : EventArgs

public: 
   ref class CodecsFilterHeartbeatEventArgs : EventArgs

class CodecsFilterHeartbeatEventArgs(EventArgs):

Remarks

Refer to RasterCodecs.FilterHeartbeat for more information.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
 
 
// Call this method with a very large and complex XLSX document and a timeout in seconds value 
// Returns true on success and false if aborted 
// For each page, the image is loaded and passed to the processImage action 
public bool FilterHeartbeatExample(string inputFileName, int timeoutSeconds, Action<RasterImage, int> processImage) 
{ 
   using (var rasterCodecs = new RasterCodecs()) 
   { 
      // This is the start time, we will reset this value 
      // anytime we start an operation 
      DateTime startOperationTime = DateTime.Now; 
 
      // Create a heartbeat handler 
      EventHandler<CodecsFilterHeartbeatEventArgs> heartbeatHandler = (sender, e) => 
      { 
         // Abort if it has been more than timeoutSeconds since last operation 
         TimeSpan timeSpan = DateTime.Now - startOperationTime; 
         if (timeSpan.TotalSeconds > timeoutSeconds) 
         { 
            e.Abort = true; 
         } 
      }; 
 
      // Install the heartbeat handler 
      rasterCodecs.FilterHeartbeat += heartbeatHandler; 
 
      // First, get information on the file to get the number of pages 
      RasterImageFormat format; 
      int pageCount = 0; 
 
      // Reset the start time 
      startOperationTime = DateTime.Now; 
      using (CodecsImageInfo imageInfo = rasterCodecs.GetInformation(inputFileName, true)) 
      { 
         // If GetInformationt took more than timeoutSeconds then we aborted the operation 
         // inside heartbeatHandler and GetInformation will return RasterImageFormat.Unknown 
         format = imageInfo.Format; 
         if (format != RasterImageFormat.Unknown) 
            pageCount = imageInfo.TotalPages; 
      } 
 
      // Did we abort? 
      if (format == RasterImageFormat.Unknown) 
      { 
         // Yes, fail 
         rasterCodecs.FilterHeartbeat -= heartbeatHandler; 
         return false; 
      } 
 
      // Now load all the pages 
 
      for (int pageNumber = 1; pageNumber <= pageCount; pageNumber++) 
      { 
         // Reset the start time 
         startOperationTime = DateTime.Now; 
         RasterImage image = rasterCodecs.Load(inputFileName, pageNumber); 
         // If Load took more than timeoutSeconds then we aborted the operation 
         // inside heartbeatHandler and Load will return null 
 
         // Did we abort? 
         if (image == null) 
         { 
            // Yes, fail 
            rasterCodecs.FilterHeartbeat -= heartbeatHandler; 
            return false; 
         } 
 
         // Process the image and then delete it 
         processImage(image, pageNumber); 
         image.Dispose(); 
      } 
 
      rasterCodecs.FilterHeartbeat -= heartbeatHandler; 
 
      // We successfully loaded and processed all the pages from the file 
      return true; 
   } 
}

Requirements

Target Platforms

Reference

CodecsFilterHeartbeatEventArgs Members

Leadtools.Codecs Namespace

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Help Version 22.0.2023.5.5

Leadtools.Codecs Assembly

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Leadtools.Codecs Namespace

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