DispatchSource.WriteMonitor Class

Reference

Definition

Namespace:: CoreFoundation

Assembly:: Xamarin.iOS.dll

Assembly:: Xamarin.Mac.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Sources of this type monitor file descriptors for available write buffer space.

public class DispatchSource.WriteMonitor : CoreFoundation.DispatchSource

type DispatchSource.WriteMonitor = class
    inherit DispatchSource

Inheritance: Object

DispatchObject

DispatchSource
DispatchSource.WriteMonitor

Inheritance: Object

NativeObject

DispatchObject

DispatchSource
DispatchSource.WriteMonitor

Remarks

Users of this source type are strongly encouraged to perform non-blocking I/O and handle any truncated reads or error conditions that may occur.

var stream = File.Create ("Demo.txt");

// The the unix file handle
var safeHandle = stream.SafeFileHandle;
IntPtr descriptor = safeHandle.DangerousGetHandle ();
int fileDescriptor = descriptor.ToInt32 ();

dispatchSource = new DispatchSource.WriteMonitor (fileDescriptor, DispatchQueue.MainQueue);

dispatchSource.SetRegistrationHandler (() => {
    Console.WriteLine ("Write monitor registered");
});

dispatchSource.SetEventHandler (() => {
    Console.WriteLine ("Write monitor: was opened in write mode")
    dispatchSource.Cancel ();
    stream.Close ();
});

dispatchSource.SetCancelHandler (() => {
    Console.WriteLine ("Write monitor cancelled");
});

dispatchSource.Resume ();

Constructors

DispatchSource.WriteMonitor(Int32, DispatchQueue)	Creates a file descriptor monitor that invokes the event handler when writing to the file descriptor wont block.
DispatchSource.WriteMonitor(IntPtr, Boolean)
DispatchSource.WriteMonitor(IntPtr)

Properties

BufferSpaceAvailable	Buffer space available to write on the file descriptor being monitored.
FileDescriptor	The file descriptor being monitored.
Handle	(Inherited from DispatchObject)
IsCanceled	Determine whether the specified source has been canceled. (Inherited from DispatchSource)

Methods

Activate()	(Inherited from DispatchObject)
Cancel()	Asynchronously cancels the dispatch source. (Inherited from DispatchSource)
Check()	Obsolete. (Inherited from DispatchObject)
Dispose()	(Inherited from DispatchObject)
Dispose(Boolean)	Releases the resources used by the DispatchSource object. (Inherited from DispatchSource)
Equals(Object)	(Inherited from DispatchObject)
GetHashCode()	Returns the hashcode for this object (Inherited from DispatchObject)
InitializeHandle(IntPtr)	(Inherited from NativeObject)
Release()	(Inherited from DispatchObject)
Resume()	Resumes the dispatch source. (Inherited from DispatchSource)
Retain()	(Inherited from DispatchObject)
SetCancelHandler(Action)	Provides a cancellation handler (Inherited from DispatchSource)
SetEventHandler(Action)	Specified a handler to execute when events are received on the dispatch source. (Inherited from DispatchSource)
SetRegistrationHandler(Action)	Provides a registration handler (Inherited from DispatchSource)
SetTargetQueue(DispatchQueue)	(Inherited from DispatchObject)
Suspend()	Suspends the dispatch source. (Inherited from DispatchSource)

Applies to

通过