MessageQueue.GetPublicQueuesByLabel(String) Method
Definition
Important
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Retrieves all the public queues on the network that carry the specified label.
public:
static cli::array <System::Messaging::MessageQueue ^> ^ GetPublicQueuesByLabel(System::String ^ label);public static System.Messaging.MessageQueue[] GetPublicQueuesByLabel (string label);static member GetPublicQueuesByLabel : string -> System.Messaging.MessageQueue[]Public Shared Function GetPublicQueuesByLabel (label As String) As MessageQueue()Parameters
- label
- String
A label that groups the set of queues to be retrieved.
Returns
An array of MessageQueue objects that reference the retrieved public queues.
Exceptions
An error occurred when accessing a Message Queuing method.
The label parameter is null.
Examples
The following code example retrieves lists of queues.
#using <system.dll>
#using <system.messaging.dll>
using namespace System;
using namespace System::Messaging;
using namespace System::Collections;
ref class MyNewQueue
{
public:
// Gets a list of queues with a specified category.
// Sends a broadcast message to all queues in that
// category.
void GetQueuesByCategory()
{
// Get a list of queues with the specified category.
array<MessageQueue^>^QueueList = MessageQueue::GetPublicQueuesByCategory( Guid(" {00000000-0000-0000-0000-000000000001}") );
// Send a broadcast message to each queue in the array.
IEnumerator^ myEnum = QueueList->GetEnumerator();
while ( myEnum->MoveNext() )
{
MessageQueue^ queueItem = safe_cast<MessageQueue^>(myEnum->Current);
queueItem->Send( "Broadcast message." );
}
return;
}
// Gets a list of queues with a specified label.
// Sends a broadcast message to all queues with that
// label.
void GetQueuesByLabel()
{
// Get a list of queues with the specified label.
array<MessageQueue^>^QueueList = MessageQueue::GetPublicQueuesByLabel( "My Label" );
// Send a broadcast message to each queue in the array.
IEnumerator^ myEnum = QueueList->GetEnumerator();
while ( myEnum->MoveNext() )
{
MessageQueue^ queueItem = safe_cast<MessageQueue^>(myEnum->Current);
queueItem->Send( "Broadcast message." );
}
return;
}
// Gets a list of queues on a specified computer.
// Displays the list on screen.
void GetQueuesByComputer()
{
// Get a list of queues on the specified computer.
array<MessageQueue^>^QueueList = MessageQueue::GetPublicQueuesByMachine( "MyComputer" );
// Display the paths of the queues in the list.
IEnumerator^ myEnum = QueueList->GetEnumerator();
while ( myEnum->MoveNext() )
{
MessageQueue^ queueItem = safe_cast<MessageQueue^>(myEnum->Current);
Console::WriteLine( queueItem->Path );
}
return;
}
// Gets a list of all public queues.
void GetAllPublicQueues()
{
// Get a list of public queues.
array<MessageQueue^>^QueueList = MessageQueue::GetPublicQueues();
return;
}
// Gets a list of all public queues that match
// specified criteria. Displays the list on
// screen.
void GetPublicQueuesByCriteria()
{
// Define criteria to filter the queues.
MessageQueueCriteria^ myCriteria = gcnew MessageQueueCriteria;
myCriteria->CreatedAfter = DateTime::Now.Subtract( TimeSpan(1,0,0,0) );
myCriteria->ModifiedBefore = DateTime::Now;
myCriteria->MachineName = ".";
myCriteria->Label = "My Queue";
// Get a list of queues with that criteria.
array<MessageQueue^>^QueueList = MessageQueue::GetPublicQueues( myCriteria );
// Display the paths of the queues in the list.
IEnumerator^ myEnum = QueueList->GetEnumerator();
while ( myEnum->MoveNext() )
{
MessageQueue^ queueItem = safe_cast<MessageQueue^>(myEnum->Current);
Console::WriteLine( queueItem->Path );
}
return;
}
// Gets a list of private queues on the local
// computer. Displays the list on screen.
void GetPrivateQueues()
{
// Get a list of queues with the specified category.
array<MessageQueue^>^QueueList = MessageQueue::GetPrivateQueuesByMachine( "." );
// Display the paths of the queues in the list.
IEnumerator^ myEnum = QueueList->GetEnumerator();
while ( myEnum->MoveNext() )
{
MessageQueue^ queueItem = safe_cast<MessageQueue^>(myEnum->Current);
Console::WriteLine( queueItem->Path );
}
return;
}
};
// Provides an entry point into the application.
// This example gets lists of queues by a variety
// of criteria.
int main()
{
// Create a new instance of the class.
MyNewQueue^ myNewQueue = gcnew MyNewQueue;
// Send normal and high priority messages.
myNewQueue->GetQueuesByCategory();
myNewQueue->GetQueuesByLabel();
myNewQueue->GetQueuesByComputer();
myNewQueue->GetAllPublicQueues();
myNewQueue->GetPublicQueuesByCriteria();
myNewQueue->GetPrivateQueues();
return 0;
}
using System;
using System.Messaging;
namespace MyProject
{
/// <summary>
/// Provides a container class for the example.
/// </summary>
public class MyNewQueue
{
//**************************************************
// Provides an entry point into the application.
//
// This example gets lists of queues by a variety
// of criteria.
//**************************************************
public static void Main()
{
// Create a new instance of the class.
MyNewQueue myNewQueue = new MyNewQueue();
// Send normal and high priority messages.
myNewQueue.GetQueuesByCategory();
myNewQueue.GetQueuesByLabel();
myNewQueue.GetQueuesByComputer();
myNewQueue.GetAllPublicQueues();
myNewQueue.GetPublicQueuesByCriteria();
myNewQueue.GetPrivateQueues();
return;
}
//**************************************************
// Gets a list of queues with a specified category.
// Sends a broadcast message to all queues in that
// category.
//**************************************************
public void GetQueuesByCategory()
{
// Get a list of queues with the specified category.
MessageQueue[] QueueList =
MessageQueue.GetPublicQueuesByCategory(new
Guid("{00000000-0000-0000-0000-000000000001}"));
// Send a broadcast message to each queue in the array.
foreach(MessageQueue queueItem in QueueList)
{
queueItem.Send("Broadcast message.");
}
return;
}
//**************************************************
// Gets a list of queues with a specified label.
// Sends a broadcast message to all queues with that
// label.
//**************************************************
public void GetQueuesByLabel()
{
// Get a list of queues with the specified label.
MessageQueue[] QueueList =
MessageQueue.GetPublicQueuesByLabel("My Label");
// Send a broadcast message to each queue in the array.
foreach(MessageQueue queueItem in QueueList)
{
queueItem.Send("Broadcast message.");
}
return;
}
//**************************************************
// Gets a list of queues on a specified computer.
// Displays the list on screen.
//**************************************************
public void GetQueuesByComputer()
{
// Get a list of queues on the specified computer.
MessageQueue[] QueueList =
MessageQueue.GetPublicQueuesByMachine("MyComputer");
// Display the paths of the queues in the list.
foreach(MessageQueue queueItem in QueueList)
{
Console.WriteLine(queueItem.Path);
}
return;
}
//**************************************************
// Gets a list of all public queues.
//**************************************************
public void GetAllPublicQueues()
{
// Get a list of public queues.
MessageQueue[] QueueList =
MessageQueue.GetPublicQueues();
return;
}
//**************************************************
// Gets a list of all public queues that match
// specified criteria. Displays the list on
// screen.
//**************************************************
public void GetPublicQueuesByCriteria()
{
// Define criteria to filter the queues.
MessageQueueCriteria myCriteria = new
MessageQueueCriteria();
myCriteria.CreatedAfter = DateTime.Now.Subtract(new
TimeSpan(1,0,0,0));
myCriteria.ModifiedBefore = DateTime.Now;
myCriteria.MachineName = ".";
myCriteria.Label = "My Queue";
// Get a list of queues with that criteria.
MessageQueue[] QueueList =
MessageQueue.GetPublicQueues(myCriteria);
// Display the paths of the queues in the list.
foreach(MessageQueue queueItem in QueueList)
{
Console.WriteLine(queueItem.Path);
}
return;
}
//**************************************************
// Gets a list of private queues on the local
// computer. Displays the list on screen.
//**************************************************
public void GetPrivateQueues()
{
// Get a list of queues with the specified category.
MessageQueue[] QueueList =
MessageQueue.GetPrivateQueuesByMachine(".");
// Display the paths of the queues in the list.
foreach(MessageQueue queueItem in QueueList)
{
Console.WriteLine(queueItem.Path);
}
return;
}
}
}
Imports System.Messaging
Public Class MyNewQueue
' Provides an entry point into the application.
'
' This example gets lists of queues by a variety
' of criteria.
Public Shared Sub Main()
' Create a new instance of the class.
Dim myNewQueue As New MyNewQueue()
' Send normal and high priority messages.
myNewQueue.GetQueuesByCategory()
myNewQueue.GetQueuesByLabel()
myNewQueue.GetQueuesByComputer()
myNewQueue.GetAllPublicQueues()
myNewQueue.GetPublicQueuesByCriteria()
myNewQueue.GetPrivateQueues()
Return
End Sub
' Gets a list of queues with a specified category.
' Sends a broadcast message to all queues in that
' category.
Public Sub GetQueuesByCategory()
' Get a list of queues with the specified category.
Dim QueueList As MessageQueue() = _
MessageQueue.GetPublicQueuesByCategory(New _
Guid("{00000000-0000-0000-0000-000000000001}"))
' Send a broadcast message to each queue in the array.
Dim queueItem As MessageQueue
For Each queueItem In QueueList
queueItem.Send("Broadcast message.")
Next queueItem
Return
End Sub
' Gets a list of queues with a specified label.
' Sends a broadcast message to all queues with that
' label.
Public Sub GetQueuesByLabel()
' Get a list of queues with the specified label.
Dim QueueList As MessageQueue() = _
MessageQueue.GetPublicQueuesByLabel("My Label")
' Send a broadcast message to each queue in the array.
Dim queueItem As MessageQueue
For Each queueItem In QueueList
queueItem.Send("Broadcast message.")
Next queueItem
Return
End Sub
' Gets a list of queues on a specified computer.
' Displays the list on screen.
Public Sub GetQueuesByComputer()
' Get a list of queues on the specified computer.
Dim QueueList As MessageQueue() = _
MessageQueue.GetPublicQueuesByMachine("MyComputer")
' Display the paths of the queues in the list.
Dim queueItem As MessageQueue
For Each queueItem In QueueList
Console.WriteLine(queueItem.Path)
Next queueItem
Return
End Sub
' Gets a list of all public queues.
Public Sub GetAllPublicQueues()
' Get a list of public queues.
Dim QueueList As MessageQueue() = _
MessageQueue.GetPublicQueues()
Return
End Sub
' Gets a list of all public queues that match
' specified criteria. Displays the list on
' screen.
Public Sub GetPublicQueuesByCriteria()
' Define criteria to filter the queues.
Dim myCriteria As New MessageQueueCriteria()
myCriteria.CreatedAfter = DateTime.Now.Subtract(New _
TimeSpan(1, 0, 0, 0))
myCriteria.ModifiedBefore = DateTime.Now
myCriteria.MachineName = "."
myCriteria.Label = "My Queue"
' Get a list of queues with that criteria.
Dim QueueList As MessageQueue() = _
MessageQueue.GetPublicQueues(myCriteria)
' Display the paths of the queues in the list.
Dim queueItem As MessageQueue
For Each queueItem In QueueList
Console.WriteLine(queueItem.Path)
Next queueItem
Return
End Sub
' Gets a list of private queues on the local
' computer. Displays the list on screen.
Public Sub GetPrivateQueues()
' Get a list of queues with the specified category.
Dim QueueList As MessageQueue() = _
MessageQueue.GetPrivateQueuesByMachine(".")
' Display the paths of the queues in the list.
Dim queueItem As MessageQueue
For Each queueItem In QueueList
Console.WriteLine(queueItem.Path)
Next queueItem
Return
End Sub
End Class
Remarks
Use this method to filter the public queues by label.
GetPublicQueuesByLabel(String) retrieves a static snapshot of the queues. To interact with a dynamic list of the queues, use GetMessageQueueEnumerator. You can specify the label as part of the MessageQueueCriteria you pass into the method.
The following table shows whether this method is available in various Workgroup modes.
| Workgroup mode | Available |
|---|---|
| Local computer | No |
| Local computer and direct format name | No |
| Remote computer | No |
| Remote computer and direct format name | No |
Applies to
See also
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