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Listen(string,int,int) Method

Summary

Establishes a connection to listen for incoming connection requests.

Syntax
C#
VB
C++
public void Listen( 
   string hostAddress, 
   int hostPort, 
   int maxNumberOfPeers 
) 
Public Overloads Sub Listen( _ 
   ByVal hostAddress As String, _ 
   ByVal hostPort As Integer, _ 
   ByVal maxNumberOfPeers As Integer _ 
)  
public: 
void Listen(  
   String^ hostAddress, 
   int hostPort, 
   int maxNumberOfPeers 
)  

Parameters

hostAddress
The IP address of the host computer (the SCP's address).

hostPort
The port number of the host computer (the SCP's port).

maxNumberOfPeers
Backlog parameter.

Remarks

If hostAddress is an empty string or a null reference (Nothing in VB), the IP address will be the local computer's address.

If hostAddress is "*", the IP address will be all of the local computer's addresses. This is useful if the local computer has more than one network interface and address.

If hostPort is 0, the port number will be the number of the first available port.

The maxNumberOfPeers parameter is the value passed to the WinSock listen() function for the backlog parameter that limits the size of the queue for waiting connections. As an example, suppose that the value is set to 3 and that 4 people try to connect at exactly the same time. In such a case, all 4 will be rejected because the connection backlog queue is full. But if one of the connections has been accepted by the time the 4th is made, then all will work.

To determine how many clients are connected and impose a limit on the number of connections, perform the following steps:

  1. Use the DicomNet.GetClientCount function in the "OnReceiveAssociateRequest" handler.
  2. Compare that value with the maximum number of connections allowed.
  3. If the number of clients connected is greater than the maximum number of connections allowed, send a "SendAssociateReject" command to the client trying to connect.

To connect to a server as a client, you must first create and initialize a DicomNet object. Then call Connect to establish the connection.

To use your computer as an SCP, you must first create a DicomNet object. Then call Listen to listen for incoming connection requests.

Example

For an example, refer to SendAssociateRequest.

Requirements

Target Platforms

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