LDicomNet::GetAssociate

#include "ltdic.h"

LDicomAssociate * LDicomNet::GetAssociate(L_VOID)

Returns the DICOM Associate for the DICOM Network object. This function is available in the PACS Imaging Toolkit.

Returns

The DICOM Associate associated with the DICOM Network object.

Comments

A DICOM Association must be established between an SCU and an SCP before any DICOM messages or data can be transmitted between them. For more information on creating a DICOM Association, refer to Creating a DICOM Associate Connection.

When the DICOM Association is no longer needed, it should be closed. For more information, refer to Closing a DICOM Associate Connection.

Required DLLs and Libraries

Platforms

Win32, x64

See Also

Topics

Example

namespace LDicomNet_GetAssociate_Namespace 
{ 
   // Logs a message 
   // This implementation logs to the console, and the debug window 
   L_VOID LogMessage(TCHAR *szMsg) 
   { 
      wprintf(TEXT("\n")); 
      wprintf(szMsg); 
 
      OutputDebugStringW(TEXT("\n")); 
      OutputDebugStringW(szMsg); 
   } 
 
 
     // ******************************************************************************************* 
   // Client Class  
   // 
   // Class that is used to connect to the server  
   // ******************************************************************************************* 
   class CMyClient : public LDicomNet 
   { 
   public: 
      CMyClient(L_INT32 nMode): LDicomNet(NULL, nMode) 
      { 
         m_waitEvent = CreateEvent( NULL, TRUE, TRUE, TEXT("ClientEvent")); 
         ResetEvent(m_waitEvent); 
      } 
 
      ~CMyClient(void) 
      { 
         CloseHandle(m_waitEvent); 
      } 
 
      // Client 
      L_VOID   OnConnect                  (L_INT nError); 
      L_VOID   OnReceiveAssociateAccept  (LDicomAssociate *pPDU); 
      L_VOID   OnReceiveReleaseResponse(); 
 
      L_BOOL Wait(DWORD timeout = 5000); 
 
   private: 
      HANDLE m_waitEvent; 
   }; 
 
   // Continues dispatching messages until hEvent is signalled, our timeout 
   // Returns TRUE if hEvent is signalled 
   // Returns FALSE if timeout 
   L_BOOL MessageLoop ( 
      HANDLE hEvent, // handles that need to be waited on 
      DWORD timeout  // timeout in milliseconds 
      ) 
   { 
      DWORD dwStart = GetTickCount(); 
      MSG msg = {0}; 
 
      volatile L_BOOL bRunForever = TRUE; 
      while (bRunForever) 
      { 
         if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))  
         { 
            TranslateMessage(&msg); 
            DispatchMessage(&msg); 
         } 
 
         if (WaitForSingleObject(hEvent, 0) == WAIT_OBJECT_0) 
         { 
            ResetEvent(hEvent); 
            return TRUE; 
         } 
 
         DWORD dwCurrent = GetTickCount(); 
         if ((dwCurrent - dwStart) > timeout) 
         { 
            return FALSE; 
         } 
      } 
      return TRUE; 
   } 
 
   L_VOID CMyClient::OnConnect(L_INT nError) 
   { 
      L_TCHAR szMsg[200] = {0}; 
 
      wsprintf(szMsg, TEXT("CMyClient::OnConnect: nError[%d]"), nError);  
      LogMessage(szMsg); 
   } 
 
   L_VOID CMyClient::OnReceiveAssociateAccept  (LDicomAssociate *pPDU) 
   { 
      UNREFERENCED_PARAMETER(pPDU); 
      SetEvent(m_waitEvent); 
      LogMessage(TEXT("CMyClient::OnReceiveAssociateAccept")); 
   } 
 
   L_VOID CMyClient::OnReceiveReleaseResponse() 
   { 
      SetEvent(m_waitEvent); 
      LogMessage(TEXT("CMyClient::OnReceiveReleaseResponse")); 
   } 
 
   L_BOOL CMyClient::Wait(DWORD timeout) 
   { 
      L_BOOL bRet = MessageLoop(m_waitEvent,  timeout);   
      return bRet; 
   } 
 
   // ******************************************************************************************* 
   // Server Connection Class  
   // 
   // When a client connects, CMyServer creates a new instance of the CMyServerConnection class  
   // and accepts the connection.   
   // ******************************************************************************************* 
   class CMyServerConnection : public LDicomNet 
   { 
   public: 
      CMyServerConnection(L_INT32 nMode): LDicomNet(NULL, nMode) 
      { 
      } 
      ~CMyServerConnection(void) 
      { 
      } 
 
      // Server 
      L_VOID OnReceiveAssociateRequest(LDicomAssociate *pPDU); 
      L_VOID OnReceiveReleaseRequest(); 
   }; 
 
   #define SIZEINWORD(p) sizeof(p)/sizeof(L_TCHAR) 
   L_VOID CMyServerConnection::OnReceiveAssociateRequest(LDicomAssociate *pPDU) 
   { 
      LogMessage(TEXT("\tCMyServerConnection::OnReceiveAssociateRequest")); 
 
      //check the version, if not 1, reject it 
      if (pPDU->GetVersion() != 1) 
      { 
         LogMessage(TEXT("\tCMyServerConnection::SendAssociateReject")); 
         SendAssociateReject( 
            PDU_REJECT_RESULT_PERMANENT,  
            PDU_REJECT_SOURCE_USER,  
            PDU_REJECT_REASON_UNKNOWN 
            ); 
      } 
      else 
      {         
         LDicomAssociate DicomAssociate(FALSE); 
 
         //Copy presentation objects from received 
         //Reply that we only support the first Transfer Syntax from the received hPDU 
         L_TCHAR szTransfer[PDU_MAX_UID_SIZE+1] = {0}; 
         L_TCHAR szAbstract[PDU_MAX_UID_SIZE+1] = {0}; 
         L_INT iPresentationCount = pPDU->GetPresentationCount(); 
         for (L_UCHAR i = 0; i<iPresentationCount; i++) 
         { 
            L_UCHAR nId = pPDU->GetPresentation(i); 
            pPDU->GetTransfer(nId, 0, szTransfer, PDU_MAX_UID_SIZE+1); 
            L_UCHAR nResult = PDU_ACCEPT_RESULT_SUCCESS; 
            pPDU->GetAbstract(nId, szAbstract, PDU_MAX_UID_SIZE+1); 
            DicomAssociate.AddPresentation( nId, nResult, szAbstract); 
            DicomAssociate.AddTransfer( nId, szTransfer); 
         } 
 
         LogMessage(TEXT("\tCMyServerConnection::SendAssociateAccept")); 
         SendAssociateAccept(&DicomAssociate); 
      } 
   } 
 
   L_VOID CMyServerConnection::OnReceiveReleaseRequest() 
   { 
      LogMessage(TEXT("\tCMyServerConnection::OnReceiveReleaseRequest")); 
      LogMessage(TEXT("\tCMyServerConnection::SendReleaseResponse")); 
      SendReleaseResponse(); 
   } 
 
   // ******************************************************************************************* 
   // Server Class  
   // 
   // Listens for connections 
   // When a client connects, this class creates a CMyServerConnection and accepts the connection 
   // ******************************************************************************************* 
   class CMyServer : public LDicomNet 
   { 
   public: 
      CMyServer(L_INT32 nMode): LDicomNet(NULL, nMode) 
      { 
         m_pServerConnection = NULL; 
      } 
 
      ~CMyServer(void) 
      { 
         if (m_pServerConnection != NULL) 
         { 
            delete m_pServerConnection; 
         } 
      } 
 
      L_VOID OnAccept       (L_INT nError); 
      L_VOID OnClose        (L_INT nError, LDicomNet *pServerConnection); 
 
      CMyServerConnection *m_pServerConnection; 
   }; 
 
   L_VOID CMyServer::OnAccept(L_INT nError) 
   { 
      LogMessage(TEXT("\tCMyServer::OnAccept")); 
      if (nError != DICOM_SUCCESS) 
      { 
         return; 
      } 
 
      if (m_pServerConnection != NULL) 
      { 
         delete m_pServerConnection; 
         m_pServerConnection = NULL; 
      } 
 
      m_pServerConnection = new CMyServerConnection(DICOM_SECURE_NONE); 
      if (m_pServerConnection == NULL) 
      { 
         return; 
      } 
 
      nError = LDicomNet::Accept(m_pServerConnection); 
      if (nError != DICOM_SUCCESS) 
      { 
         delete m_pServerConnection; 
         return; 
      } 
   } 
 
   L_VOID CMyServer::OnClose(L_INT nError, LDicomNet *pServerConnection) 
   { 
      UNREFERENCED_PARAMETER(nError); 
      LogMessage(TEXT("\tCMyServer::OnClose")); 
      if (m_pServerConnection == pServerConnection) 
      { 
         m_pServerConnection = NULL; 
      } 
      delete (CMyServerConnection *)pServerConnection; 
   } 
 
   // ******************************************************************************************* 
   // Sample starts here  
   // ******************************************************************************************* 
   #define WaitForProcessing() \ 
   { \ 
      if (!client.Wait()) \ 
      { \ 
         LogMessage(TEXT("Timeout: client.Connect")); \ 
         nRet = DICOM_ERROR_NET_TIME_OUT; \ 
         goto Cleanup; \ 
      } \ 
   }  
 
 L_VOID GetAssociateExample(CMyClient* pDicomNet) 
 { 
   L_TCHAR szTemp[100] = {0}; 
   L_UCHAR nID = 0; 
 
   //get the associate object for this client computer's connection 
   LDicomAssociate *pDicomAssociate  = pDicomNet->GetAssociate(); 
 
   //find the id for UID_VERIFICATION_CLASS within this association 
   //if it is supported by the association 
   nID = pDicomAssociate->FindAbstract(UID_VERIFICATION_CLASS); 
   if (nID == 0) 
   { 
      LogMessage(TEXT("Not Supported by this association!")); 
   } 
   else 
   { 
      wsprintf(szTemp, TEXT("Found in the following presentation IDs: \n %d"), nID); 
      LogMessage(szTemp); 
 
      nID = pDicomAssociate->FindNextAbstract(nID, UID_VERIFICATION_CLASS); 
      while (nID != 0) 
      { 
         wsprintf(szTemp, TEXT("%d\n"), nID); 
         LogMessage(szTemp); 
      } 
   } 
} 
 
 L_INT LDicomNet_GetAssociateExample() 
   { 
      L_INT nRet = DICOM_SUCCESS; 
      LogMessage(TEXT("\n\n *** LDicomNet_GetAssociateExample ***")); 
 
      L_TCHAR *pszServerAddress = TEXT("127.0.0.1"); 
      L_UINT uServerPort = 104; 
 
      LDicomNet::StartUp(); 
 
      CMyClient client(DICOM_SECURE_NONE); 
      CMyServer server(DICOM_SECURE_NONE); 
 
      LogMessage(TEXT("\tCMyServer::Listen")); 
      nRet = server.Listen(pszServerAddress, uServerPort, 5); 
 
      LogMessage(TEXT("CMyClient::Connect")); 
      client.Connect(NULL, 0, pszServerAddress, uServerPort); 
      if (!client.Wait(2000)) 
      { 
         if (!client.IsConnected()) 
         { 
            LogMessage(TEXT("Timeout: client.Connect"));  
            nRet = DICOM_ERROR_NET_TIME_OUT; 
            goto Cleanup; 
         } 
      } 
 
      if (nRet == DICOM_SUCCESS) 
      { 
         //create the Associate Class as Request 
         LDicomAssociate dicomAssociateRequest(TRUE); 
         dicomAssociateRequest.Default(); 
 
         // Send A-Associate-RQ message 
         dicomAssociateRequest.SetCalled(TEXT("LEAD_SERVER")); 
         dicomAssociateRequest.SetCalling(TEXT("LEAD_CLIENT")); 
 
         LogMessage(TEXT("CMyClient::SendAssociateRequest")); 
         nRet = client.SendAssociateRequest(&dicomAssociateRequest); 
         if (!client.Wait(5000)) 
         { 
            LogMessage(TEXT("Timeout: client.Connect"));  
            nRet = DICOM_ERROR_NET_TIME_OUT; 
            goto Cleanup; 
         } 
 
         GetAssociateExample(&client); 
 
         LogMessage(TEXT("CMyClient::SendReleaseRequest")); 
         client.SendReleaseRequest(); 
         WaitForProcessing(); 
      } 
 
Cleanup: 
      LogMessage(TEXT("CMyClient::Close")); 
      client.Close(); 
      client.Wait(1000); 
 
      LogMessage(TEXT("\tCMyServer::Close")); 
      server.Close(); 
 
      LDicomNet::ShutDown(); 
 
      return nRet; 
   } 
 
} 
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