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


#include "ltdic.h"

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


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 with the information to use when creating.


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


Calling this function generates a call to LDicomNet::OnReceiveNCreateRequest on the SCP. The SCP should respond by calling LDicomNet::SendNCreateResponse which will generate a call to LDicomNet::OnReceiveNCreateResponse.

This function creates a new SOP Instance on the specified peer connection. The data set with the new information must be created and filled before calling this function.

Required DLLs and Libraries


Win32, x64

See Also




This example sends an N-Create Request to a server
In this example:

  1. LMyDicomNet is a class derived from LDicomNet
  2. LMyDicomNet has the following member variables:
    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
  3. m_pDicomNet points to a valid LMyDicomNet object
    LMyDicomNet *m_pDicomNet

  4. A connection exists between client and server

  5. An association exists between the client and server
    L_INT LDicomNet__SendNCreateRequestExample(LMyDicomNet *m_pDicomNet) 
       L_INT nRet; 
       CString strMsg = TEXT("N-Create\n"); 
       //Get the associate object 
       LDicomAssociate *pDicomAssociate = m_pDicomNet->GetAssociate(); 
      //Choose an SOP Class to create--in this example, choose UID_SC_IMAGE_STORAGE 
       CString strClassUID = UID_SC_IMAGE_STORAGE; 
       //Choose an SOP Instance to create 
       CString strInstanceUID = TEXT("1.2.840.113619."); 
       //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; 
          //Here you would normally construct a data set containing the attributes, values for the new SOP instance 
          //For this sample, pick a dicom file to send as the data set 
          LDicomDS DicomDS; 
          L_UINT16 uUniqueID = 99; 
          nRet =DicomDS.LoadDS(MAKE_IMAGE_PATH(TEXT("IMAGE1.dcm")),0); 
          if(nRet > 0) 
             return nRet; 
          nRet =m_pDicomNet->SendNCreateRequest( nPresentationID,  
                                           (L_TCHAR *)(LPCTSTR)strClassUID,  
                                           (L_TCHAR *)(LPCTSTR)strInstanceUID, 
          if(nRet > 0) 
             return nRet; 
       return DICOM_SUCCESS; 
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LEADTOOLS DICOM C++ Class Library Help

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.