LDicomNet::SendNGetRequest

#include "ltdic.h"

L_INT LDicomNet::SendNGetRequest(nPresentationID, nMessageID, pszClass, pszInstance, pnAttribute, nCount)

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

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

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

Comments

Calling this function generates a call to LDicomNet::OnReceiveNGetRequest on the SCP. The SCP should respond by calling LDicomNet::SendNGetResponse which will generate a call to LDicomNet::OnReceiveNGetResponse.

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::SendNGetResponse, LDicomNet::OnReceiveNGetRequest, LDicomNet::OnReceiveNGetResponse
Topics:	Working with DICOM Network Connections

Example

L_INT LDicomNet__SendNGetRequestExample(LMyDicomNet *m_pDicomNet)
{
   //This example sends an N-Get Request to a server
   //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_INT nRet;
   CString strMsg = TEXT("N-Get\n");
   
   //Get the associate object
   LDicomAssociate *pDicomAssociate = m_pDicomNet->GetAssociate();
   
   //Choose an SOP Class to find
   CString strClassUID = UID_SC_IMAGE_STORAGE;
   
   //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
   {      
      //Create a list of the identifiers that you wish to get from the server
      CString  strGetFile = TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\temp\\nGet.dic");
      CString strInstanceUID = TEXT("1.1.1.1");
      
      L_UINT16 uUniqueID = 99;
      L_UINT32 Attributes[] = {  TAG_PATIENT_NAME, 
                                 TAG_PATIENT_ID, 
                                 TAG_PATIENT_SEX,
                                 TAG_NUMBER_OF_STUDY_RELATED_INSTANCES };
      
      L_UINT16 uNumAttributes = sizeof(Attributes) / sizeof(L_UINT32);
      //global variable to count results
      m_pDicomNet->m_FileCount = 0;
      nRet =m_pDicomNet->SendNGetRequest( nPresentationID, 
                                    uUniqueID, 
                                    (L_TCHAR *)(LPCTSTR)strClassUID, 
                                    (L_TCHAR *)(LPCTSTR)strInstanceUID,  
                                    Attributes, 
                                    uNumAttributes);
      if(nRet > 0)
         return nRet;
      
      strMsg += TEXT("SendNGetRequest\n");
   }
   AfxMessageBox(strMsg);
   return DICOM_SUCCESS;
}