Freigeben über


AsyncBase Class

 

The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at AsyncBase Class.

Implements the Windows Runtime asynchronous state machine.

Syntax

  
template <  
   typename TComplete,  
   typename TProgress = Details::Nil,  
   AsyncResultType resultType = SingleResult  
>  
class AsyncBase : public AsyncBase< TComplete, Details::Nil, resultType >;  
  
template <  
   typename TComplete,  
   AsyncResultType resultType  
>  
class AsyncBase< TComplete, Details::Nil, resultType > : public Microsoft::WRL::Implements< IAsyncInfo >;  

Parameters

TComplete
An event handler that is called when an asynchronous operation completes.

TProgress
An event handler that is called when a running asynchronous operation reports the current progress of the operation.

resultType
One of the AsyncResultType enumeration values. By default, SingleResult.

Members

Public Constructors

Name Description
AsyncBase::AsyncBase Constructor Initializes an instance of the AsyncBase class.

Public Methods

Name Description
AsyncBase::Cancel Method Cancels an asynchronous operation.
AsyncBase::Close Method Closes the asynchronous operation.
AsyncBase::FireCompletion Method Invokes the completion event handler, or resets the internal progress delegate.
AsyncBase::FireProgress Method Invokes the current progress event handler.
AsyncBase::get_ErrorCode Method Retrieves the error code for the current asynchronous operation.
AsyncBase::get_Id Method Retrieves the handle of the asynchronous operation.
AsyncBase::get_Status Method Retrieves a value that indicates the status of the asynchronous operation.
AsyncBase::GetOnComplete Method Copies the address of the current completion event handler to the specified variable.
AsyncBase::GetOnProgress Method Copies the address of the current progress event handler to the specified variable.
AsyncBase::put_Id Method Sets the handle of the asynchronous operation.
AsyncBase::PutOnComplete Method Sets the address of the completion event handler to the specified value.
AsyncBase::PutOnProgress Method Sets the address of the progress event handler to the specified value.
AsyncBase::Start Method Starts the asynchronous operation.

Protected Methods

Name Description
AsyncBase::CheckValidStateForDelegateCall Method Tests whether delegate properties can be modified in the current asynchronous state.
AsyncBase::CheckValidStateForResultsCall Method Tests whether the results of an asynchronous operation can be collected in the current asynchronous state.
AsyncBase::ContinueAsyncOperation Method Determines whether the asynchronous operation should continue processing or should halt.
AsyncBase::CurrentStatus Method Retrieves the status of the current asynchronous operation.
AsyncBase::ErrorCode Method Retrieves the error code for the current asynchronous operation.
AsyncBase::OnCancel Method When overridden in a derived class, cancels an asynchronous operation.
AsyncBase::OnClose Method When overridden in a derived class, closes an asynchronous operation.
AsyncBase::OnStart Method When overridden in a derived class, starts an asynchronous operation.
AsyncBase::TryTransitionToCompleted Method Indicates whether the current asynchronous operation has completed.
AsyncBase::TryTransitionToError Method Indicates whether the specified error code can modify the internal error state.

Inheritance Hierarchy

AsyncBase

AsyncBase

Requirements

Header: async.h

Namespace: Microsoft::WRL

See Also

Microsoft::WRL Namespace