L_DicomSendNGetResponse

#include "ltdic.h"

L_LTDIC_API L_INT L_DicomSendNGetResponse(hNet, nPresentationID, nMessageID, pszClass, pszInstance, nStatus, hDS)

HDICOMNET hNet;	/* a DICOM Network handle */
L_UCHAR nPresentationID;	/* presentation ID */
L_UINT16 nMessageID;	/* message ID */
L_TCHAR * pszClass;	/* class type */
L_TCHAR * pszInstance;	/* instance */
L_UINT16 nStatus;	/* status */
HDICOMDS hDS;	/* data set */

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

Parameter	Description
hNet	A DICOM Network handle to the peer member of the connection.
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.
nStatus	The status of the original request. For a list of possible values, refer to Status Constants.
hDS	Data set that contains the retrieved elements.

Returns

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

Comments

L_DicomSendNGetResponse is sent by the SCP in response to an L_DicomSendNGetRequest call placed by an SCU. This generates a call to RECEIVENGETRESPONSECALLBACK on the SCU.

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

See Also

Functions:	L_DicomSendNGetRequest, RECEIVENGETREQUESTCALLBACK, RECEIVENGETRESPONSECALLBACK
Topics:	Working with DICOM Network Connections

Example

#include <windowsx.h>
static HWND hList;      /* handle to list box */

L_INT16 PerformNGETCommand(
   L_TCHAR* pszClass,
   L_TCHAR* pszInstance,
   HDICOMDS hDS,
   L_UINT32* pnAttribute,
   L_UINT32 nCount)
{
   UNREFERENCED_PARAMETER(pszInstance);
   UNREFERENCED_PARAMETER(pszClass);
   L_INT16 nRet;
   L_UINT32 x;
   HDICOMDS hDSTemp=NULL;
   pDICOMELEMENT pElement=NULL;
   pDICOMELEMENT pNewElement=NULL;
   pDICOMTAG pTag=NULL;
   L_TCHAR  *pVal=NULL;
   L_UINT32 uSize;
   L_UINT32 uCount;
   
   /* 
       this sample simply loads a fixed data set
       here, a server should check the class and instance against
       all SOP classes it manages, and then fill out hDS from the
       correctly matching instance, if one is found
   */
       
   hDSTemp = L_DicomCreateDS(NULL);
   nRet = L_DicomLoadDS(hDSTemp, TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\Test3.dcm"), 0);
   L_DicomInitDS(hDS, CLASS_UNKNOWN, 0);
   L_DicomResetDS(hDS);
           
   if(nRet != DICOM_SUCCESS)
   {
      L_DicomFreeDS(hDSTemp);
      return nRet;
   }
   
   for(x=0; x<nCount; x++)
   {
      /* get each element */
      pTag = L_DicomFindTag(pnAttribute[x]);
      pElement = L_DicomFindFirstElement(hDSTemp, NULL, pnAttribute[x], FALSE);
      /* in this sample, if we don't find the requested tag, we */
      /* do not return an empty element! */
      if(pElement)
      {
         /* copy the element value */
         uCount = L_DicomGetCountValue(hDSTemp, pElement);
         uSize = L_DicomGetConvertValue(hDSTemp, pElement, NULL, 0);
         pVal = (L_TCHAR *)GlobalAllocPtr(GMEM_MOVEABLE, uSize * sizeof(L_TCHAR));
         L_DicomGetConvertValue(hDSTemp, pElement, pVal, uSize);

         pNewElement = L_DicomInsertElement(hDS, NULL, FALSE, pnAttribute[x], pTag->nVR, FALSE, 0);
         if (pElement == NULL)
         {
            L_DicomFreeDS(hDS);
            return DICOM_ERROR_MEMORY;
         }

         L_DicomSetConvertValue(hDS, pNewElement, pVal, uCount);
         GlobalFreePtr(pVal);
      }
   }
   L_DicomFreeDS(hDSTemp);
   return(DICOM_SUCCESS);
}

L_VOID EXT_CALLBACK OnReceiveNGetRequest(HDICOMNET hNet, L_UCHAR nPresentationID, L_UINT16 nMessageID, L_TCHAR *pszClass, L_TCHAR *pszInstance, L_UINT32 *pnAttribute, L_UINT32 nCount, L_VOID *pUserData)
{
   UNREFERENCED_PARAMETER(pUserData);
   UNREFERENCED_PARAMETER(pszInstance);
   UNREFERENCED_PARAMETER(pszClass);
   L_TCHAR szMsg[800];
   HDICOMDS hDS=NULL;
   L_INT nRet;

   ListBox_AddString(hList, TEXT("Command Set - N-GET-REQUEST"));
   wsprintf(szMsg, TEXT("     Presentation ID: %d"), nPresentationID);
   ListBox_AddString(hList, szMsg);
   wsprintf(szMsg, TEXT("     Message ID: %d"), nMessageID);
   ListBox_AddString(hList, szMsg);
   wsprintf(szMsg, TEXT("     Affected SOP Class: %s"), pszClass);
   ListBox_AddString(hList, szMsg);
   wsprintf(szMsg, TEXT("     Affected SOP Instance: %s"), pszInstance);
   ListBox_AddString(hList, szMsg);
   
   /* this function will fill the values the data set elements in LEADDICOM2.hDicomDS */
   hDS = L_DicomCreateDS(NULL);
   
   nRet = PerformNGETCommand(pszClass, pszInstance, hDS, pnAttribute, nCount);
   if(nRet != DICOM_SUCCESS)
      nRet = COMMAND_STATUS_NO_SUCH_OBJECT_INSTANCE;

   /* send a response */
   L_DicomSendNGetResponse(hNet, nPresentationID, nMessageID, pszClass, pszInstance, (L_UINT16) nRet, (nRet==DICOM_SUCCESS)?hDS:0);
   L_DicomFreeDS(hDS);
}