LDicomNet::SendNGetRequest

Summary

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

Syntax

L_INT LDicomNet::SendNGetRequest(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

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

Platforms

Win32, x64

See Also

Functions

• LDicomNet::SendNGetResponse
• LDicomNet::OnReceiveNGetRequest
• LDicomNet::OnReceiveNGetResponse

Topics

• Working with DICOM Network Connections

Example

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)
   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__SendNGetRequestExample(LMyDicomNet *m_pDicomNet) 
   { 
      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 = MAKE_IMAGE_PATH(TEXT("IMAGE1.dcm")); 
         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; 
   }