DicomAssociate Constructor

Summary

Initializes a new instance of the DicomAssociate class.

Syntax

C++

public DicomAssociate( 
   bool request 
)

Public Function New( _ 
   ByVal request As Boolean _ 
)

public: 
DicomAssociate(  
   bool request 
)

Parameters

request
true to create an Associate Request; false to create an Associate Accept.

Remarks

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. The characteristics of the DICOM Associate Connection may be set using Default or by using the following properties and methods:

ApplicationContextName

SetPresentationContextID

SetAsynchronousOperations

SetRoleSelect

ImplementationVersionName

SetUserInformation

SetExtendedData

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

Example

This is a comprehensive sample that shows how to use DICOM associates both on the SCP (server) and the SCU (client) sides.

using Leadtools; 
using Leadtools.Dicom; 
 
 
[StructLayout(LayoutKind.Sequential)] 
public struct MSG 
{ 
   public IntPtr hwnd; 
   public uint message; 
   public IntPtr wParam; 
   public IntPtr lParam; 
   public uint time; 
   public System.Drawing.Point p; 
} 
 
public enum WaitReturn 
{ 
   Complete, 
   Timeout, 
} 
 
class Utils 
{ 
   [DllImport("user32.dll")] 
   [return: MarshalAs(UnmanagedType.Bool)] 
   static extern bool PeekMessage(out MSG lpMsg, IntPtr hWnd, 
                                  uint wMsgFilterMin, uint wMsgFilterMax, 
                                  uint wRemoveMsg); 
 
   [DllImport("user32.dll")] 
   static extern bool TranslateMessage([In] ref MSG lpMsg); 
   [DllImport("user32.dll")] 
   static extern IntPtr DispatchMessage([In] ref MSG lpmsg); 
 
   const uint PM_REMOVE = 1; 
 
   public static WaitReturn WaitForComplete(double mill, WaitHandle wh) 
   { 
      TimeSpan goal = new TimeSpan(DateTime.Now.AddMilliseconds(mill).Ticks); 
 
      do 
      { 
         MSG msg = new MSG(); 
 
         if (PeekMessage(out msg, IntPtr.Zero, 0, 0, PM_REMOVE)) 
         { 
            TranslateMessage(ref msg); 
            DispatchMessage(ref msg); 
         } 
 
         if (wh.WaitOne(new TimeSpan(0, 0, 0), false)) 
         { 
            return WaitReturn.Complete; 
         } 
 
         if (goal.CompareTo(new TimeSpan(DateTime.Now.Ticks)) < 0) 
         { 
            return WaitReturn.Timeout; 
         } 
 
      } while (true); 
   } 
} 
 
class Client : DicomNet 
{ 
   DicomExceptionCode _LastError = DicomExceptionCode.Success; 
   AutoResetEvent waitEvent = new AutoResetEvent(false); 
 
   public Client() 
       : base(null, DicomNetSecurityMode.None) 
   { 
   } 
 
   public DicomExceptionCode LastError 
   { 
      get 
      { 
         return _LastError; 
      } 
   } 
 
   public bool Wait() 
   { 
      WaitReturn ret; 
 
      _LastError = DicomExceptionCode.Success; 
      ret = Utils.WaitForComplete((5 * 60) * 1000, waitEvent); 
 
      return (ret == WaitReturn.Complete); 
   } 
 
   protected override void OnConnect(DicomExceptionCode error) 
   { 
      _LastError = error; 
      waitEvent.Set(); 
   } 
 
   protected override void OnReceiveAssociateAccept(DicomAssociate association) 
   { 
      waitEvent.Set(); 
   } 
 
   protected override void OnReceiveAssociateReject(DicomAssociateRejectResultType result, 
                                                    DicomAssociateRejectSourceType source, 
                                                    DicomAssociateRejectReasonType reason) 
   { 
      Debug.Assert(result == DicomAssociateRejectResultType.Permanent, "Result should be: " + DicomAssociateRejectResultType.Permanent.ToString()); 
      Debug.Assert(source == DicomAssociateRejectSourceType.User, "Source should be: " + DicomAssociateRejectSourceType.User.ToString()); 
      Debug.Assert(reason == DicomAssociateRejectReasonType.Limit, " Reason should be: " + DicomAssociateRejectReasonType.Limit.ToString()); 
      waitEvent.Set(); 
   } 
 
   protected override void OnReceiveReleaseResponse() 
   { 
      waitEvent.Set(); 
   } 
} 
 
class ServerConnection : DicomNet 
{ 
   public bool Fail = false; 
 
   public ServerConnection() 
       : base(null, DicomNetSecurityMode.None) 
   { 
   } 
 
   protected override void OnReceiveAssociateRequest(DicomAssociate association) 
   { 
      DicomAssociate retAssociation = new DicomAssociate(false); 
 
      if (Fail) 
      { 
         SendAssociateReject(DicomAssociateRejectResultType.Permanent, 
                             DicomAssociateRejectSourceType.User, 
                             DicomAssociateRejectReasonType.Limit); 
         return; 
      } 
 
      Debug.Assert(association.Called == "ServerTest", "Called AETitle should be ServerTest"); 
      Debug.Assert(association.Calling == "ClientTest", "Calling AETitle should be ClientTest"); 
      Debug.Assert(association.ImplementClass == "1.2.840.114257.1", "Implementation class should be 1.2.840.114257.1"); 
      Debug.Assert(association.ImplementationVersionName == "1", "Implementation version should be 1"); 
      Debug.Assert(association.MaxLength == 0x100000, "Max length should be 0x100000"); 
      Debug.Assert(association.GetAbstract(1) == DicomUidType.VerificationClass, "Presentation index 1 should be " + DicomUidType.VerificationClass); 
      Debug.Assert(association.GetTransfer(1, 0) == DicomUidType.ImplicitVRLittleEndian, "Abstract Syntax (1,0) should be " + DicomUidType.ImplicitVRLittleEndian); 
 
      // 
      // Build our Association Accept 
      // 
      retAssociation.Called = association.Called; 
      retAssociation.Calling = association.Calling; 
      retAssociation.ImplementClass = association.ImplementClass; 
      retAssociation.ImplementationVersionName = association.ImplementationVersionName; 
      for (int x = 0; x < association.PresentationContextCount; x++) 
      { 
         byte id = association.GetPresentationContextID(x); 
         string abSyntax = association.GetAbstract(id); 
         string trSyntax = DicomUidType.ImplicitVRLittleEndian; 
 
         retAssociation.AddPresentationContext(id, 0, abSyntax); 
         if (association.GetTransferCount(id) > 0) 
         { 
            trSyntax = association.GetTransfer(id, 0); 
         } 
         //Over here we can call retAssociation.SetAbstract to update the abstract 
         //syntax for any of the sresentation contexts 
         retAssociation.AddTransfer(id, trSyntax); 
         if (retAssociation.GetTransferCount(id) == 0) 
         { 
            // 
            // Presentation id doesn't have any abstract 
            //  syntaxes therefore we will reject it. 
            // 
            retAssociation.SetResult(id, DicomAssociateAcceptResultType.AbstractSyntax); 
            Debug.Assert(retAssociation.GetResult(id) == DicomAssociateAcceptResultType.AbstractSyntax, "Result should be: " + DicomAssociateAcceptResultType.AbstractSyntax.ToString()); 
         } 
 
 
         //  We can also call in here SetPresentationContextID if we would like  
         //  to change some of the presentation IDs 
         //  And SetTransfer to update the Transfer Syntax for a certian 
         //  presentation context. 
 
      } 
      SendAssociateAccept(retAssociation); 
   } 
 
   protected override void OnReceiveReleaseRequest() 
   { 
      SendReleaseResponse(); 
   } 
}; 
 
class Server : DicomNet 
{ 
   ServerConnection client; 
 
   public Server() 
       : base(null, DicomNetSecurityMode.None) 
   { 
   } 
 
   public bool Fail 
   { 
      get 
      { 
         if (client == null) 
            return false; 
 
         return client.Fail; 
      } 
 
      set 
      { 
         if (client != null) 
         { 
            client.Fail = value; 
         } 
      } 
   } 
 
   protected override void OnAccept(DicomExceptionCode error) 
   { 
      client = new ServerConnection(); 
 
      Accept(client); 
   } 
} 
 
public void SendAssociateRequestSample() 
{ 
   DicomEngine.Startup(); 
   DicomNet.Startup(); 
 
   using (Server server = new Server()) 
   { 
      using (Client client = new Client()) 
      { 
         // 
         // Connect to server 
         // 
         server.Listen("127.0.0.1", 104, 1); // start server 
         client.Connect(null, 1000, "127.0.0.1", 104); // connect to server 
         if (!client.Wait()) // wait for connection to finish 
         { 
            Debug.Fail("Connection timed out"); 
         } 
         Debug.Assert(client.LastError == DicomExceptionCode.Success, "Connection failed"); 
         Debug.Assert(client.IsConnected(), "Client not connected"); 
 
         // 
         // Send associate request 
         // 
         DicomAssociate associate = new DicomAssociate(true); 
 
         associate.Called = "ServerTest"; 
         associate.Calling = "ClientTest"; 
         associate.ImplementClass = "1.2.840.114257.1"; 
         associate.ImplementationVersionName = "1"; 
         associate.MaxLength = 0x100000; 
         //We can also call in here associate.Default() to initialize  
         //the association with default values. 
         associate.AddPresentationContext(1, 0, DicomUidType.VerificationClass); 
         associate.AddTransfer(1, DicomUidType.ImplicitVRLittleEndian); 
         client.SendAssociateRequest(associate); 
         if (!client.Wait()) // wait for connection to finish 
         { 
            Debug.Fail("SendAssociateRequest timed out"); 
         } 
 
         // 
         // SendReleaseRequest 
         // 
         client.SendReleaseRequest(); 
         if (!client.Wait()) // wait for connection to finish 
         { 
            Debug.Fail("SendAssociateRequest timed out"); 
         } 
 
         // 
         // Force association to send SendAssociateReject. This is for 
         // testing purposes only.  Only one association should be sent 
         // per connection. 
         // 
         server.Fail = true; 
         client.SendAssociateRequest(associate); 
         if (!client.Wait()) // wait for connection to finish 
         { 
            Debug.Fail("SendAssociateRequest timed out"); 
         } 
         server.Fail = false; 
 
         // 
         // SendReleaseRequest 
         // 
         client.SendReleaseRequest(); 
         if (!client.Wait()) // wait for connection to finish 
         { 
            Debug.Fail("SendAssociateRequest timed out"); 
         } 
 
         client.CloseForced(true); 
      } 
      server.CloseForced(true); 
   } 
 
   DicomEngine.Shutdown(); 
   DicomNet.Shutdown(); 
}

Imports Leadtools 
Imports Leadtools.Dicom 
 
<StructLayout(LayoutKind.Sequential)> 
Public Structure MSG 
   Public hwnd As IntPtr 
   Public message As UInteger 
   Public wParam As IntPtr 
   Public lParam As IntPtr 
   Public time As UInteger 
   Public p As System.Drawing.Point 
End Structure 
 
Public Enum WaitReturn 
   Complete 
   Timeout 
End Enum 
 
Private Class Utils 
   <DllImport("user32.dll")> 
   Shared Function PeekMessage(<System.Runtime.InteropServices.Out()> ByRef lpMsg As MSG, ByVal hWnd As IntPtr, ByVal wMsgFilterMin As UInteger, 
                                  ByVal wMsgFilterMax As UInteger, ByVal wRemoveMsg As UInteger) As <MarshalAs(UnmanagedType.Bool)> Boolean 
   End Function 
 
   <DllImport("user32.dll")> 
   Shared Function TranslateMessage(ByRef lpMsg As MSG) As Boolean 
   End Function 
   <DllImport("user32.dll")> 
   Shared Function DispatchMessage(ByRef lpmsg As MSG) As IntPtr 
   End Function 
 
   Private Const PM_REMOVE As UInteger = 1 
 
   Public Shared Function WaitForComplete(ByVal mill As Double, ByVal wh As WaitHandle) As WaitReturn 
      Dim goal As TimeSpan = New TimeSpan(DateTime.Now.AddMilliseconds(mill).Ticks) 
 
      Do 
         Dim msg As MSG = New MSG() 
 
         If PeekMessage(msg, IntPtr.Zero, 0, 0, PM_REMOVE) Then 
            TranslateMessage(msg) 
            DispatchMessage(msg) 
         End If 
 
         If wh.WaitOne(New TimeSpan(0, 0, 0), False) Then 
            Return WaitReturn.Complete 
         End If 
 
         If goal.CompareTo(New TimeSpan(DateTime.Now.Ticks)) < 0 Then 
            Return WaitReturn.Timeout 
         End If 
 
      Loop While True 
   End Function 
End Class 
 
Private Class Client : Inherits DicomNet 
   Private _LastError As DicomExceptionCode = DicomExceptionCode.Success 
   Private waitEvent As AutoResetEvent = New AutoResetEvent(False) 
 
   Public Sub New() 
      MyBase.New(Nothing, DicomNetSecurityMode.None) 
   End Sub 
 
   Public ReadOnly Property LastError() As DicomExceptionCode 
      Get 
         Return _LastError 
      End Get 
   End Property 
 
   Public Function Wait() As Boolean 
      Dim ret As WaitReturn 
 
      _LastError = DicomExceptionCode.Success 
      ret = Utils.WaitForComplete((5 * 60) * 1000, waitEvent) 
 
      Return (ret = WaitReturn.Complete) 
   End Function 
 
   Protected Overrides Sub OnConnect(ByVal [error] As DicomExceptionCode) 
      _LastError = [error] 
      waitEvent.Set() 
   End Sub 
 
   Protected Overrides Sub OnReceiveAssociateAccept(ByVal association As DicomAssociate) 
      waitEvent.Set() 
   End Sub 
 
   Protected Overrides Sub OnReceiveAssociateReject(ByVal result As DicomAssociateRejectResultType, ByVal source As DicomAssociateRejectSourceType, 
                                                    ByVal reason As DicomAssociateRejectReasonType) 
      Debug.Assert(result = DicomAssociateRejectResultType.Permanent, "Result should be: " & DicomAssociateRejectResultType.Permanent.ToString()) 
      Debug.Assert(source = DicomAssociateRejectSourceType.User, "Source should be: " & DicomAssociateRejectSourceType.User.ToString()) 
      Debug.Assert(reason = DicomAssociateRejectReasonType.Limit, " Reason should be: " & DicomAssociateRejectReasonType.Limit.ToString()) 
      waitEvent.Set() 
   End Sub 
 
   Protected Overrides Sub OnReceiveReleaseResponse() 
      waitEvent.Set() 
   End Sub 
End Class 
 
Private Class ServerConnection : Inherits DicomNet 
   Public Fail As Boolean = False 
 
   Public Sub New() 
      MyBase.New(Nothing, DicomNetSecurityMode.None) 
   End Sub 
 
   Protected Overrides Sub OnReceiveAssociateRequest(ByVal association As DicomAssociate) 
      Dim retAssociation As DicomAssociate = New DicomAssociate(False) 
 
      If Fail Then 
         SendAssociateReject(DicomAssociateRejectResultType.Permanent, DicomAssociateRejectSourceType.User, DicomAssociateRejectReasonType.Limit) 
         Return 
      End If 
 
      Debug.Assert(association.Called = "ServerTest", "Called AETitle should be ServerTest") 
      Debug.Assert(association.Calling = "ClientTest", "Calling AETitle should be ClientTest") 
      Debug.Assert(association.ImplementClass = "1.2.840.114257.1", "Implementation class should be 1.2.840.114257.1") 
      Debug.Assert(association.ImplementationVersionName = "1", "Implementation version should be 1") 
      Debug.Assert(association.MaxLength = &H100000, "Max length should be 0x100000") 
      Debug.Assert(association.GetAbstract(1) = DicomUidType.VerificationClass, "Presentation index 1 should be " & DicomUidType.VerificationClass) 
      Debug.Assert(association.GetTransfer(1, 0) = DicomUidType.ImplicitVRLittleEndian, "Abstract Syntax (1,0) should be " & DicomUidType.ImplicitVRLittleEndian) 
 
      ' 
      ' Build our Association Accept 
      ' 
      retAssociation.Called = association.Called 
      retAssociation.Calling = association.Calling 
      retAssociation.ImplementClass = association.ImplementClass 
      retAssociation.ImplementationVersionName = association.ImplementationVersionName 
      Dim x As Integer = 0 
      Do While x < association.PresentationContextCount 
         Dim id As Byte = association.GetPresentationContextID(x) 
         Dim abSyntax As String = association.GetAbstract(id) 
         Dim trSyntax As String = DicomUidType.ImplicitVRLittleEndian 
 
         retAssociation.AddPresentationContext(id, 0, abSyntax) 
         If association.GetTransferCount(id) > 0 Then 
            trSyntax = association.GetTransfer(id, 0) 
         End If 
         'Over here we can call retAssociation.SetAbstract to update the abstract 
         'syntax for any of the sresentation contexts 
 
         retAssociation.AddTransfer(id, trSyntax) 
 
         If retAssociation.GetTransferCount(id) = 0 Then 
            'Presentation id doesn't have any abstract 
            'syntaxes therefore we will reject it. 
            retAssociation.SetResult(id, DicomAssociateAcceptResultType.AbstractSyntax) 
            Debug.Assert(retAssociation.GetResult(id) = DicomAssociateAcceptResultType.AbstractSyntax, 
                         "Result should be: " + DicomAssociateAcceptResultType.AbstractSyntax.ToString()) 
         End If 
 
 
         '  We can also call in here SetPresentationContextID if we would like  
         '  to change some of the presentation IDs 
         '  And SetTransfer to update the Transfer Syntax for a certian 
         '  presentation context. 
 
         x += 1 
      Loop 
      SendAssociateAccept(retAssociation) 
   End Sub 
 
   Protected Overrides Sub OnReceiveReleaseRequest() 
      SendReleaseResponse() 
   End Sub 
End Class 
 
Private Class Server : Inherits DicomNet 
   Private client As ServerConnection 
 
   Public Sub New() 
      MyBase.New(Nothing, DicomNetSecurityMode.None) 
   End Sub 
 
   Public Property Fail() As Boolean 
      Get 
         If client Is Nothing Then 
            Return False 
         End If 
 
         Return client.Fail 
      End Get 
 
      Set(ByVal value As Boolean) 
         If Not client Is Nothing Then 
            client.Fail = value 
         End If 
      End Set 
   End Property 
 
   Protected Overrides Sub OnAccept(ByVal [error] As DicomExceptionCode) 
      client = New ServerConnection() 
 
      Accept(client) 
   End Sub 
End Class 
 
Public Sub SendAssociateRequestSample() 
   DicomEngine.Startup() 
   DicomNet.Startup() 
 
   Using server As Server = New Server() 
      Using client As Client = New Client() 
         ' 
         ' Connect to server 
         ' 
         server.Listen("127.0.0.1", 104, 1) ' start server 
         client.Connect(Nothing, 1000, "127.0.0.1", 104) ' connect to server 
         If (Not client.Wait()) Then ' wait for connection to finish 
            Debug.Fail("Connection timed out") 
         End If 
         Debug.Assert(client.LastError = DicomExceptionCode.Success, "Connection failed") 
         Debug.Assert(client.IsConnected(), "Client not connected") 
 
         ' 
         ' Send associate request 
         ' 
         Dim associate As DicomAssociate = New DicomAssociate(True) 
 
         associate.Called = "ServerTest" 
         associate.Calling = "ClientTest" 
         associate.ImplementClass = "1.2.840.114257.1" 
         associate.ImplementationVersionName = "1" 
         associate.MaxLength = &H100000 
         'We can also call in here associate.Default() to initialize  
         'the association with default values. 
         associate.AddPresentationContext(1, 0, DicomUidType.VerificationClass) 
         associate.AddTransfer(1, DicomUidType.ImplicitVRLittleEndian) 
         client.SendAssociateRequest(associate) 
         If (Not client.Wait()) Then ' wait for connection to finish 
            Debug.Fail("SendAssociateRequest timed out") 
         End If 
 
         ' 
         ' SendReleaseRequest 
         ' 
         client.SendReleaseRequest() 
         If (Not client.Wait()) Then ' wait for connection to finish 
            Debug.Fail("SendAssociateRequest timed out") 
         End If 
 
         ' 
         ' Force association to send SendAssociateReject. This is for 
         ' testing purposes only.  Only one association should be sent 
         ' per connection. 
         ' 
         server.Fail = True 
         client.SendAssociateRequest(associate) 
         If (Not client.Wait()) Then ' wait for connection to finish 
            Debug.Fail("SendAssociateRequest timed out") 
         End If 
         server.Fail = False 
 
         ' 
         ' SendReleaseRequest 
         ' 
         client.SendReleaseRequest() 
         If (Not client.Wait()) Then ' wait for connection to finish 
            Debug.Fail("SendAssociateRequest timed out") 
         End If 
 
         client.CloseForced(True) 
      End Using 
      server.CloseForced(True) 
   End Using 
 
   DicomEngine.Shutdown() 
   DicomNet.Shutdown() 
End Sub

Requirements

Target Platforms

Reference

DicomAssociate Class

DicomAssociate Members

Download our FREE evaluation

Help Version 21.0.2021.6.30

Leadtools.Dicom Assembly

Introduction

Getting Started

Namespaces

Leadtools.Dicom Namespace

Assemblies