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LoadXmlAfterElementData Class

Summary

Data for the LoadXmlAfterElementCallback delegate.

Syntax

C++/CLI

public class LoadXmlAfterElementData

public ref class LoadXmlAfterElementData

Remarks

A LoadXmlAfterElementData object is passed to the LoadXmlAfterElementCallback delegate once for each DICOM element after it has been added to the DicomDataSet. The members of LoadXmlAfterElementData provide information about the DICOM element, and can be modified to change the elements and data that are added to the DicomDataSet so you can change the value of the element. This is useful if you want to load a DicomDataSet from an input DICOM XML file that does not contain image data. After adding the PixelData element, pixel data can be loaded from another location.

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 SaveXmlCallbackExample() 
{ 
   string dicomFileNameIn = Path.Combine(LEAD_VARS.ImagesDir, "DICOM", "image3.dcm"); 
   string xmlFileNameOut = Path.Combine(LEAD_VARS.ImagesDir, "test.xml"); 
   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 XML to a file with no binary data 
   // For the demo, keep the XML output file size small by skipping the pixel data 
   // Use the SaveXmlCallback delegate to customize the XML file 
   DicomDataSetSaveXmlFlags xmlFlags = 
      DicomDataSetSaveXmlFlags.IgnoreBinaryData | 
      DicomDataSetSaveXmlFlags.TrimWhiteSpace | 
      DicomDataSetSaveXmlFlags.TagWithCommas; 
 
   ds.SaveXml(xmlFileNameOut, xmlFlags, new SaveXmlCallback(MySaveXmlCallback)); 
 
   // Use a LoadmlCallback to read the customized XML file 
   ds.LoadXml(xmlFileNameOut, DicomDataSetLoadXmlFlags.None, new LoadXmlBeforeElementCallback(MyLoadXmlBeforeElementCallback), new LoadXmlAfterElementCallback(MyLoadXmlAfterElementCallback)); 
 
   // Save the result -- there will be no pixel data 
   ds.Save(dicomFileNameOut, DicomDataSetSaveFlags.None); 
 
   DicomEngine.Shutdown(); 
} 
 
private static bool MySaveXmlCallback(SaveXmlData data) 
{ 
   //string sTag = data.attributes["tag"]; 
   //if (sTag.StartsWith("0008")) 
   //   return false; 
   if (data.NodeType == DicomXmlNodeType.Comment) 
   { 
      data.Comment = "COMMENT: customized xml file using the SaveXmlCallback"; 
      return false; 
   } 
 
   if (data.ElementName == "dataset") 
   { 
      data.Attributes.Add("new_attribute", "some_value"); 
   } 
   else if (data.ElementName == "element") 
   { 
      data.ElementName = "element_newname"; 
      string sTagValue = data.Attributes["tag"]; 
      data.Attributes.Remove("tag"); 
      data.Attributes.Add("tag_newname", sTagValue); 
   } 
   return true; 
} 
 
private static bool MyLoadXmlBeforeElementCallback(LoadXmlBeforeElementData data) 
{ 
   string sTagValue = data.Attributes["tag_newname"]; 
   long tag = 0; 
   sTagValue = sTagValue.Replace(",", string.Empty); 
   if (long.TryParse(sTagValue, System.Globalization.NumberStyles.HexNumber, null, out tag)) 
      data.Tag = tag; 
   return true; 
} 
 
private static void MyLoadXmlAfterElementCallback(LoadXmlAfterElementData 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"; 
}