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LoadJsonBeforeElementData Class

Summary

Data for the LoadJsonBeforeElementCallback delegate.

Syntax

C++/CLI

public class LoadJsonBeforeElementData

public ref class LoadJsonBeforeElementData

Remarks

A LoadJsonBeforeElementData object is passed to the LoadJsonBeforeElementCallback delegate for each DICOM element is about to be written to the DicomDataSet. The members of LoadJsonBeforeElementData give information about the DICOM element, and can be modified to change the elements and data that are added to the DicomDataSet. The following table identifies which members are information only, and which elements can be changed.

Member	Use
Tag	can be changed
Vr	can be changed
Encoding	can be changed
ElementValue	can be changed
HasChildElements	information only

Example

using Leadtools.Dicom; 
using Leadtools.Dicom.Common; 
using Leadtools.Dicom.Common.Extensions; 
using Leadtools; 
using Leadtools.Dicom.Common.Linq.BasicDirectory; 
using Leadtools.Dicom.Common.DataTypes; 
 
using Leadtools.Codecs; 
 
public void LoadJsonCallbackExample() 
{ 
   string dicomFileNameIn = Path.Combine(LEAD_VARS.ImagesDir,"DICOM", "image2.dcm"); 
   string jsonFileNameOut = Path.Combine(LEAD_VARS.ImagesDir, "test.json"); 
   string dicomFileNameOut = Path.Combine(LEAD_VARS.ImagesDir, "test.dcm"); 
 
   // Initialize DICOM engine 
   DicomEngine.Startup(); 
 
   DicomDataSet ds = new DicomDataSet(); 
 
   // Load an existing DICOM file 
   ds.Load(dicomFileNameIn, DicomDataSetLoadFlags.None); 
 
   // Save as JSON to a file with no binary data 
   // For the demo, keep the json output file size small by skipping the pixel data 
   // Use the SaveJsonCallback delegate to customize the json file 
   DicomDataSetSaveJsonFlags jsonFlags = 
      DicomDataSetSaveJsonFlags.IgnoreBinaryData | 
      DicomDataSetSaveJsonFlags.TrimWhiteSpace; 
 
   ds.SaveJson(jsonFileNameOut, jsonFlags); 
 
   // Use a LoadmlCallback to read the customized json file 
   ds.LoadJson(jsonFileNameOut, DicomDataSetLoadJsonFlags.None, MyLoadJsonBeforeElementCallback, MyLoadJsonAfterElementCallback); 
 
   // Save the result -- there will be no pixel data 
   ds.Save(dicomFileNameOut, DicomDataSetSaveFlags.None); 
 
   DicomEngine.Shutdown(); 
} 
 
private static bool MyLoadJsonBeforeElementCallback(LoadJsonBeforeElementData data) 
{ 
   // Remove Patient Birth Date 
   if (data.Tag == DicomTag.PatientBirthDate) 
   { 
      return false; 
   } 
 
   // Change the patient name 
   if (data.Tag == DicomTag.PatientName) 
   { 
      data.ElementValue = "NewLast^NewFirst"; 
   } 
 
   // Write the elements to the consolee that have child elements 
   if (data.HasChildElements) 
   { 
      Console.WriteLine("Element {0} has child elements.", data.Tag); 
   } 
   return true; 
} 
 
private static void MyLoadJsonAfterElementCallback(LoadJsonAfterElementData data) 
{ 
   if (data.DicomElement.Tag == DicomTag.PixelData) 
   { 
      // here you could call one of the following to set the pixel data 
      //    data.DicomDataSet.SetBinaryValue  
      //    data.DicomDataSet.SetImage() 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}