GetFirst Method

Summary

Returns the first item in the Data Element Tag Table.

Syntax

Objective-C

C++/CLI

Java

public DicomTag GetFirst()

@property (nonatomic, strong, readonly, nullable) LTDicomTag *first;

public DicomTag getFirst()

public: 
DicomTag^ GetFirst();

Return Value

DicomTag class that contains the first item in the Data Element Tag Table.

Remarks

The following methods will also help you navigate the Data Element Tag Table:
To determine the number of entries in the Data Element Tag Table, use GetCount.

Example

using Leadtools; 
using Leadtools.Dicom; 
 
 
public void TestTagTable() 
{ 
 
   //Make sure to initialize the DICOM engine, this needs to be done only once  
   //In the whole application 
   DicomEngine.Startup(); 
 
   //We don't need to call this since the DicomEngine.Startup already does that for us 
   //These calls are for demonstration purposes only 
   DicomTagTable.Instance.Reset(); 
   DicomTagTable.Instance.Default(); 
 
   //We can also call FindByIndex if we know the index of this Tag 
   DicomTag tag = DicomTagTable.Instance.Find(DicomTag.PatientName); 
   DicomTagTable.Instance.Delete(tag); 
 
   DicomTag tag1 = DicomTagTable.Instance.Insert(DicomTag.PatientName, 0xFFFFFFFF, "Patient's Name", DicomVRType.PN, 1, 1, 1); 
 
   Console.WriteLine("Tag Information:"); 
   Console.WriteLine("code is:         {0}", tag1.ToHexString()); 
   Console.WriteLine("VR is :          {0}", tag1.VR); 
   Console.WriteLine("MinVM is :       {0}", tag1.MinVM); 
   Console.WriteLine("MaxVM is :       {0}", tag1.MaxVM); 
   Console.WriteLine("VMDivider is :   {0}", tag1.VMDivider); 
 
   Debug.Assert(DicomTagTable.Instance.Exists(tag1) == true); 
   DicomTagTable.Instance.SetName(tag1, "Patient's Name 1"); 
 
   int count = 0; 
   //If we want to loop through all the Tags in the table we can do this: 
   tag = DicomTagTable.Instance.GetFirst(); 
   while (tag != null) 
   { 
      // We can also access the rest of the properties of DicomTag in here, 
      // such as DicomTagType.Code, DicomTagType.Name, DicomTagType.Mask 
 
      if (tag.Code == DicomTag.PatientName) 
      { 
         Console.WriteLine(tag.Name); 
      } 
      count++; 
      tag = DicomTagTable.Instance.GetNext(tag); 
   } 
   //We can use GetLast and GetPrevious to achieve the same thing 
 
   Debug.Assert(count == DicomTagTable.Instance.GetCount()); 
 
   DicomEngine.Shutdown(); 
}