In This Topic ▼

LDicomNet::SendNSetRequest

Summary

Sends an N-GET-RSP message to a peer member of a connection. This function is available in the PACS Imaging Toolkit.

Syntax

#include "ltdic.h"

L_INT LDicomNet::SendNSetRequest(nPresentationID, nMessageID, pszClass, pszInstance, pDS)

Parameters

L_UCHAR nPresentationID

Presentation ID. The presentation ID provides information about both the class type of the data and the transfer syntax to use when transferring the data.

L_UINT16 nMessageID

Message ID. Each message sent by a member of a connection should have a unique ID. Since a member of a connection may send several messages, this ID allows that member to identify when a specific request has been completed.

L_TCHAR * pszClass

Class affected by the request. This will be an SOP Class or an SOP MetaClass.

L_TCHAR * pszInstance

The instance of the class. A server may, for example, have three instances of the Nuclear Medicine Class. This value identifies the data with a specific instance.

LDicomDS *pDS

Data set that contains the new information to set.

Returns

Value	Meaning
0	SUCCESS
>0	An error occurred. Refer to Return Codes.

Comments

Calling this function generates a call to LDicomNet::OnReceiveNSetRequest on the SCP. The SCP should respond by calling LDicomNet::SendNSetResponse which will generate a call to LDicomNet::OnReceiveNSetResponse.

Required DLLs and Libraries

LTDIC
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application

Platforms

Win32, x64

Example

This example sends an N-Set request to the server that changes the patient id of an SOP Instance
In this example:

LMyDicomNet is a class derived from LDicomNet
LMyDicomNet has the following member variables:
m_nClientOrServer: can be (STATUS_NONE, STATUS_SERVER, STATUS_CLIENT)
identifies the LMyDicomNet object as a server or a client
m_nDataCommand: can be (COMMAND_C_MOVE,COMMAND_C_GET)
set so the server knows how a C-Store Response was generated
m_pDicomNet points to a valid LMyDicomNet object
LMyDicomNet *m_pDicomNet
A connection exists between client and server

An association exists between the client and server

L_INT LDicomNet__SendNSetRequestExample(LMyDicomNet *m_pDicomNet) 
{ 
   L_INT nRet; 
   CString strMsg = TEXT("N-Set\n"); 
    
   //Choose an SOP Class to find 
   CString strClassUID = UID_SC_IMAGE_STORAGE; 
    
   //Choose an SOP Instance to modify 
   CString strInstanceUID = TEXT("1.1.1.1"); 
    
   //create the data set that encodes the changed element(s) 
   LDicomDS DicomDS; 
   DicomDS.InitDS(CLASS_UNKNOWN, 0); 
    
   pDICOMTAG pDicomTag = LDicomTag::Find(TAG_PATIENT_ID); 
    
   pDICOMELEMENT pElement = DicomDS.InsertElement(  
      NULL,                      //pDICOMELEMENT pNeighbor 
      FALSE,                     //L_BOOL bChild 
      TAG_PATIENT_ID,            //L_UINT32 nTag 
      pDicomTag->nVR,            //L_UINT16 nVR 
      FALSE,                     //L_BOOL bSequence, 
      0                        //L_UINT32 nIndex 
      ); 
    
   //Choose new patient ID 
   CString strNewPatientID = TEXT("123-45-6789"); 
   DicomDS.SetStringValue(pElement, (L_TCHAR *)(LPCTSTR)strNewPatientID, 1, 
    DICOM_CHARACTER_SET_DEFAULT); 
    
   //Get the associate object 
   LDicomAssociate *pDicomAssociate = m_pDicomNet->GetAssociate(); 
    
   //Is class supported in the assocation? 
   L_UCHAR nPresentationID = pDicomAssociate->FindAbstract((L_TCHAR *)(LPCTSTR)strClassUID); 
    
   //nPresentationID must be odd--0 indicates failure 
   if (nPresentationID==0) 
   { 
      CString strTmp; 
      strTmp.Format(TEXT("Abstract Syntax[%s] Not Included in the Association"), strClassUID); 
      strMsg = strMsg + strTmp; 
   } 
   else //success 
   {       
      //send a request 
      L_UINT16 uUniqueID = 99; 
      nRet =m_pDicomNet->SendNSetRequest( nPresentationID,  
                                    uUniqueID,  
                                   (L_TCHAR *)(LPCTSTR)strClassUID,  
                                   (L_TCHAR *)(LPCTSTR)strInstanceUID,  
                                    &DicomDS 
                                  ); 
      if(nRet > 0) 
         return nRet; 
   } 
   AfxMessageBox(strMsg); 
 
   return DICOM_SUCCESS; 
}