LDicomNet::OnReceiveNGetRequest

Summary

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

Syntax

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

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.

L_UINT32 *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.

L_UINT16 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

Platforms

Win32, x64

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)
   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_VOID LMyDicomNet::OnReceiveNGetRequest(L_UCHAR nPresentationID, L_UINT16 nMessageID, L_TCHAR *pszClass, L_TCHAR *pszInstance, L_UINT32 *pnAttribute, L_UINT16 nCount) 
   { 
      CString strMsg; 
      L_UINT lPeerPort; 
      L_TCHAR  szPeerAddress[100]; 
       
      GetPeerInfo(szPeerAddress, 100, 
       &lPeerPort); 
       
      strMsg.Format(TEXT("*** 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(MAKE_IMAGE_PATH(TEXT("IMAGE1.dcm")), 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_TCHAR szText[100]; 
            DicomDS1.GetConvertValue(pElement, szText,100); 
            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 += TEXT("SendNGetResponse\n"); 
      AfxMessageBox(strMsg); 
   }