LDicomNet::OnReceiveNGetRequest

#include "ltdic.h"

virtual L_VOID LDicomNet::OnReceiveNGetRequest(nPresentationID, nMessageID, pszClass, pszInstance, pnAttribute, nCount)

L_UCHAR nPresentationID;	/* presentation ID */
L_UINT16 nMessageID;	/* message ID */
L_CHAR * pszClass;	/* class type */
L_CHAR * pszInstance;	/* instance */
L_UINT16 * pnAttribute;	/* array of attributes */
L_UINT32 nCount;	/* number of attributes */

Notifies a connection that an N-GET-REQ command was received. This function is available in the Medical Suite Toolkit.

Parameter	Description
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.
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.
pszClass	Class affected by the request. This will be an SOP Class or an SOP MetaClass.
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.
pnAttribute	An array of the attributes to get. The attributes must be specified using the Data Element Tags. For a list of available Data Element Tags, refer to Data Element Tag Constants.
nCount	Number of attributes being requested.

Returns

None.

Comments

A call to this function is generated on a peer member of a connection when LDicomNet::SendNGetRequest is called locally.

To customize this function, you must derive a class from LDicomNet and override this function.

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

See Also

Functions:	LDicomNet::SendNGetRequest, LDicomNet::SendNGetResponse, LDicomNet::OnReceiveNGetResponse
Topics:	Receiving Messages

Example

//In this example:
//
//1. LMyDicomNet is a class derived from LDicomNet
//2. LMyDicomNet has the following member variables:
//       m_nClientOrServer:  can be (STATUS_NONE, STATUS_SERVER, STATUS_CLIENT)
//                           identifieds 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_VOID LMyDicomNet::OnReceiveNGetRequest(L_UCHAR nPresentationID, L_UINT16 nMessageID, L_CHAR *pszClass, L_CHAR *pszInstance, L_UINT32 *pnAttribute, L_UINT16 nCount)
{
   CString strMsg;
   L_UINT lPeerPort;
   L_CHAR  szPeerAddress[100];

   GetPeerInfo(szPeerAddress, &lPeerPort);

   strMsg.Format("*** OnReceiveNGetRequest ***\nPeer[%s]\nnPresentationID[%d]\nnMessageID[%d]\npszClass[%s]\npszInstance[%s]\npnAttribute[%x]\nnCount[%d]",
                  szPeerAddress,
                  nPresentationID,
                  nMessageID,
                  pszClass,
                  pszInstance,
                  pnAttribute,
                  nCount);

   //An actual server should check the class and instance against all SOP classes
   //it manages, and then fill out hDS from the correctly matching instance
   //This sample loads a fixed data set

   LDicomDS DicomDS1, DicomDS2;

   //Load DS1
   DicomDS1.LoadDS("d:\\work\\images\\dicom16.dic", 0);

   //Initialize DS2 to send
   DicomDS2.InitDS(CLASS_UNKNOWN, 0);

   pDICOMELEMENT pFirstElement = DicomDS1.GetFirstElement(NULL, FALSE, FALSE);
   for (int i = 0; i< nCount; i++)
   {
      //get each element
      pDICOMTAG pDicomTag = LDicomTag::Find(pnAttribute[i]);
      pDICOMELEMENT pElement = DicomDS1.FindFirstElement(NULL, pDicomTag->nCode, FALSE);

      //If requested tag not found, do not return an empty element
      if (pElement != NULL)
      {
         //copy the element value
         L_CHAR szText[100];
         DicomDS1.GetConvertValue(pElement, szText);
         DicomDS2.InsertElement(pFirstElement, FALSE, pDicomTag->nCode, pDicomTag->nVR, FALSE, 0);
         DicomDS2.SetConvertValue(pElement, szText, 1);
      }
   }

   //send a response
   L_UINT16 nStatus = COMMAND_STATUS_SUCCESS;
   SendNGetResponse(nPresentationID, nMessageID, pszClass, pszInstance, nStatus, &DicomDS2);
   strMsg = strMsg + "SendNGetResponse\n";
   AfxMessageBox(strMsg);
}