DatagramSocket.GetOutputStreamAsync(EndpointPair) | getOutputStreamAsync(EndpointPair) method

Applies to Windows and Windows Phone

Starts an operation to get an IOutputStream to a remote network destination specified by an EndpointPair object that can then be used to send network data.

Syntax


datagramSocket.getOutputStreamAsync(endpointPair).done( /* Your success and error handlers */ );

Parameters

endpointPair

Type: EndpointPair

An endpoint pair that represents the local hostname or local IP address, the local service name or local UDP port, the remote hostname or remote IP address, and the remote service name or remote UDP port.

Return value

Type: IAsyncOperation<IOutputStream>

An IOutputStream that represents the asynchronous operation.

Remarks

The GetOutputStreamAsync(EndpointPair) method on a DatagramSocket is used to start an operation to get an IOutputStream to a remote network destination specified by an EndpointPair object. The IOutputStream can then be used to send data to the remote destination.

The GetOutputStreamAsync(EndpointPair) method will return an IOutputStream when it completes successfully. Writing to that stream will send datagrams to the remote host and service name specified. The IOutputStream will always send to the remote hostname and remote service name specified in the ConnectAsync method.

The RemoteHostName property of the EndpointPair passed in the endpointPair parameter can contain either the hostname or IP address of the remote destination. The RemoteServiceName property of the EndpointPair passed in the endpointPair parameter can contain either the service name or a UDP port of the remote destination. If the RemoteHostName property contains a hostname, then the GetOutputStreamAsync(EndpointPair) method results in name resolution of the remote hostname. If the RemoteServiceName property contains a service name, then the GetOutputStreamAsync method results in resolution of the remote service name to a UDP port.

The RemoteHostName and RemoteServiceName properties must be provided on the EndpointPair object passed in the endpointPair parameter. If the RemoteHostName is null or the RemoteServiceName is null or an empty string, an error will occur.

If the EndpointPair object passed in the endpointPair parameter contains a null LocalHostName property, then the system will supply the local IP address that will be used. If the EndpointPair object passed in the endpointPair parameter contains an empty string for the LocalServiceName property, then the system will supply the local UDP port that will be used.

There are two ways of using a DatagramSocket to send UDP datagrams to a remote network destination:

The GetOutputStreamAsync methods allow an app to send UDP datagrams using a DatagramSocket object to multiple network destinations. Each time the GetOutputStreamAsync(EndpointPair) method is called, the app can set different values for the RemoteHostName and RemoteServiceName members in the endpointPair parameter.

To receive data from any remote endpoint on the DatagramSocket object, an app must assign the MessageReceived event to an event handler and then call either BindEndpointAsync or BindServiceNameAsync method to bind the DatagramSocket to a local service name or UDP port before calling the GetOutputStreamAsync method. The MessageReceived event handler must be set before any bind or connect operation, otherwise an error will occur.

The typical order of operations is as follows:

  1. Create the DatagramSocket.
  2. Use the Control property to retrieve a DatagramSocketControl object and set any advanced controls. This step is not normally needed by most apps.
  3. Assign the MessageReceived event to an event handler.
  4. Call the GetOutputStreamAsync(EndpointPair) method to get the OutputStream to send data to the remote endpoint. The GetOutputStreamAsync(EndpointPair) method will also bind the DatagramSocket to a local service name or UDP port and a local hostname or IP address using the endpointPair parameter.
  5. The MessageReceived event handler will be invoked whenever a message from the remote endpoint arrives.

The GetOutputStreamAsync methods also differ from the ConnectAsync methods when an app uses the BindEndpointAsync or BindServiceNameAsync method to bind a local service name or UDP port. With the GetOutputStreamAsync methods, the app will receive packets from any remote destination sent to the local service name or UDP port. With the ConnectAsync methods, the app will only receive packets from the remote destination passed as parameters to the ConnectAsync methods.

The BindServiceNameAsync(String, NetworkAdapter) method can be used to specify a network adapter before calling the GetOutputStreamAsync(EndpointPair) method. The specified adapter is used for the bind operation. If after calling BindServiceNameAsync(String, NetworkAdapter) and the endpointPair parameter passed to GetOutputStreamAsync(EndpointPair) specifies a LocalHostName, the GetOutputStreamAsync(EndpointPair) method will fail.

Requirements

Minimum supported client

Windows 8

Minimum supported server

Windows Server 2012

Minimum supported phone

Windows Phone 8

Namespace

Windows.Networking.Sockets
Windows::Networking::Sockets [C++]

Metadata

Windows.winmd

DLL

Windows.Networking.dll

Capabilities

ID_CAP_NETWORKING [Windows Phone]

See also

DatagramSocket
GetOutputStreamAsync(HostName, String)
EndpointPair
IOutputStream

 

 

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