MessageQueue.EndReceive メソッド
アセンブリ: System.Messaging (system.messaging.dll 内)

Dim instance As MessageQueue Dim asyncResult As IAsyncResult Dim returnValue As Message returnValue = instance.EndReceive(asyncResult)
戻り値
完了する非同期操作に関連付けられた Message。


ReceiveCompleted イベントが発生したときに、EndReceive は BeginReceive 呼び出しで開始された操作を完了します。操作を完了するために、EndReceive はメッセージを受信します。
BeginReceive はタイムアウトを指定できます。タイムアウトを指定すると、キューにメッセージが到達する前にタイムアウトが発生した場合に、ReceiveCompleted イベントが発生します。この場合、asyncResult パラメータの IsCompleted プロパティは true に設定されますが、メッセージは操作に関連付けられません。メッセージがキューに到達する前にタイムアウトが発生すると、後続の EndReceive 呼び出しは例外をスローします。
ReceiveCompleted イベントを発生させたメッセージを読み取る (キューから削除する) には、EndReceive を使用します。
メッセージを非同期に受信し続けるには、EndReceive を呼び出した後でもう一度 BeginReceive を呼び出します。
このメソッドが各種のワークグループ モードで使用できるかどうかを次の表に示します。

非同期要求をチェーンするコード例を次に示します。ローカル コンピュータに "myQueue" というキューがあることを前提にしています。Main 関数は、MyReceiveCompleted ルーチンで処理される非同期操作を開始します。MyReceiveCompleted は現在のメッセージを処理し、新しい非同期の受信操作を開始します。
Imports System Imports System.Messaging Imports System.Threading ' Provides a container class for the example. Public Class MyNewQueue ' Define static class members. Private Shared signal As New ManualResetEvent(False) Private Shared count As Integer = 0 ' Provides an entry point into the application. ' ' This example performs asynchronous receive ' operation processing. Public Shared Sub Main() ' Create an instance of MessageQueue. Set its formatter. Dim myQueue As New MessageQueue(".\myQueue") myQueue.Formatter = New XmlMessageFormatter(New Type() _ {GetType([String])}) ' Add an event handler for the ReceiveCompleted event. AddHandler myQueue.ReceiveCompleted, AddressOf _ MyReceiveCompleted ' Begin the asynchronous receive operation. myQueue.BeginReceive() signal.WaitOne() ' Do other work on the current thread. Return End Sub 'Main ' Provides an event handler for the ReceiveCompleted ' event. Private Shared Sub MyReceiveCompleted(ByVal [source] As _ [Object], ByVal asyncResult As ReceiveCompletedEventArgs) Try ' Connect to the queue. Dim mq As MessageQueue = CType([source], MessageQueue) ' End the asynchronous receive operation. Dim m As Message = _ mq.EndReceive(asyncResult.AsyncResult) count += 1 If count = 10 Then signal.Set() End If ' Restart the asynchronous receive operation. mq.BeginReceive() Catch ' Handle sources of MessageQueueException. ' Handle other exceptions. End Try Return End Sub 'MyReceiveCompleted End Class 'MyNewQueue
using System; using System.Messaging; using System.Threading; namespace MyProject { /// <summary> /// Provides a container class for the example. /// </summary> public class MyNewQueue { // Define static class members. static ManualResetEvent signal = new ManualResetEvent(false); static int count = 0; //************************************************** // Provides an entry point into the application. // // This example performs asynchronous receive // operation processing. //************************************************** public static void Main() { // Create an instance of MessageQueue. Set its formatter. MessageQueue myQueue = new MessageQueue(".\\myQueue"); myQueue.Formatter = new XmlMessageFormatter(new Type[] {typeof(String)}); // Add an event handler for the ReceiveCompleted event. myQueue.ReceiveCompleted += new ReceiveCompletedEventHandler(MyReceiveCompleted); // Begin the asynchronous receive operation. myQueue.BeginReceive(); signal.WaitOne(); // Do other work on the current thread. return; } //*************************************************** // Provides an event handler for the ReceiveCompleted // event. //*************************************************** private static void MyReceiveCompleted(Object source, ReceiveCompletedEventArgs asyncResult) { try { // Connect to the queue. MessageQueue mq = (MessageQueue)source; // End the asynchronous receive operation. Message m = mq.EndReceive(asyncResult.AsyncResult); count += 1; if (count == 10) { signal.Set(); } // Restart the asynchronous receive operation. mq.BeginReceive(); } catch(MessageQueueException) { // Handle sources of MessageQueueException. } // Handle other exceptions. return; } } }
#using <system.dll> #using <system.messaging.dll> using namespace System; using namespace System::Messaging; using namespace System::Threading; ref class MyNewQueue { public: // Define static class members. static ManualResetEvent^ signal = gcnew ManualResetEvent( false ); static int count = 0; // Provides an event handler for the ReceiveCompleted // event. static void MyReceiveCompleted( Object^ source, ReceiveCompletedEventArgs^ asyncResult ) { try { // Connect to the queue. MessageQueue^ mq = dynamic_cast<MessageQueue^>(source); // End the asynchronous receive operation. mq->EndReceive( asyncResult->AsyncResult ); count += 1; if ( count == 10 ) { signal->Set(); } // Restart the asynchronous receive operation. mq->BeginReceive(); } catch ( MessageQueueException^ ) { // Handle sources of MessageQueueException. } // Handle other exceptions. return; } }; // Provides an entry point into the application. // // This example performs asynchronous receive // operation processing. int main() { // Create an instance of MessageQueue. Set its formatter. MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" ); array<Type^>^p = gcnew array<Type^>(1); p[ 0 ] = String::typeid; myQueue->Formatter = gcnew XmlMessageFormatter( p ); // Add an event handler for the ReceiveCompleted event. myQueue->ReceiveCompleted += gcnew ReceiveCompletedEventHandler( MyNewQueue::MyReceiveCompleted ); // Begin the asynchronous receive operation. myQueue->BeginReceive(); MyNewQueue::signal->WaitOne(); // Do other work on the current thread. return 0; }
package MyProject; import System.*; import System.Messaging.*; import System.Threading.*; /// <summary> /// Provides a container class for the example. /// </summary> public class MyNewQueue { // Define static class members. private static ManualResetEvent signal = new ManualResetEvent(false); private static int count = 0; //************************************************** // Provides an entry point into the application. // // This example performs asynchronous receive // operation processing. //************************************************** public static void main(String[] args) { // Create an instance of MessageQueue. Set its formatter. MessageQueue myQueue = new MessageQueue(".\\myQueue"); myQueue.set_Formatter(new XmlMessageFormatter(new Type[] { String.class.ToType() })); // Add an event handler for the ReceiveCompleted event. myQueue.add_ReceiveCompleted(new ReceiveCompletedEventHandler( MyReceiveCompleted)); // Begin the asynchronous receive operation. myQueue.BeginReceive(); signal.WaitOne(); // Do other work on the current thread. return; } //main //*************************************************** // Provides an event handler for the ReceiveCompleted // event. //*************************************************** private static void MyReceiveCompleted(Object source, ReceiveCompletedEventArgs asyncResult) { try { // Connect to the queue. MessageQueue mq = (MessageQueue)source; // End the asynchronous receive operation. Message m = mq.EndReceive(asyncResult.get_AsyncResult()); count += 1; if (count == 10) { signal.Set(); } // Restart the asynchronous receive operation. mq.BeginReceive(); } catch (MessageQueueException exp) { // Handle sources of MessageQueueException. } // Handle other exceptions. return; } //MyReceiveCompleted } //MyNewQueue


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