GtkSharp/doc/en/Gnome.Vfs/Async.xml

<Type Name="Async" FullName="Gnome.Vfs.Async">
  <TypeSignature Language="C#" Value="public class Async" Maintainer="auto" />
  <AssemblyInfo>
    <AssemblyName>gnome-vfs-sharp</AssemblyName>
    <AssemblyPublicKey>[00 24 00 00 04 80 00 00 94 00 00 00 06 02 00 00 00 24 00 00 52 53 41 31 00 04 00 00 01 00 01 00 71 EB 6C 55 75 52 9C BF 72 44 F7 A6 EA 05 62 84 F9 EA E0 3B CF F2 CC 13 2C 9C 49 0A B3 09 EA B0 B5 6B CE 44 9D F5 03 D9 C0 A8 1E 52 05 85 CD BE 70 E2 FB 90 43 4B AC 04 FA 62 22 A8 00 98 B7 A1 A7 B3 AF 99 1A 41 23 24 BB 43 25 F6 B8 65 BB 64 EB F6 D1 C2 06 D5 73 2D DF BC 70 A7 38 9E E5 3E 0C 24 6E 32 79 74 1A D0 05 03 E4 98 42 E1 9B F3 7B 19 8B 40 21 26 CB 36 89 C2 EA 64 96 A4 7C B4]</AssemblyPublicKey>
    <AssemblyVersion>2.20.0.0</AssemblyVersion>
  </AssemblyInfo>
  <ThreadSafetyStatement>Gtk# is thread aware, but not thread safe; See the <link location="node:gtk-sharp/programming/threads">Gtk# Thread Programming</link> for details.</ThreadSafetyStatement>
  <Docs>
    <summary>Asynchronous File Operations; POSIX-style file operations that run outside your main loop.</summary>
    <remarks>The members of this class are all static methods and use the <see cref="T:Gnome.Vfs.Handle" /> class to reference asynchronous operations in progress.
<example><code lang="C#">
using GLib;
using Gnome.Vfs;
using System;
using System.Text;
using System.Threading;

namespace Test.Gnome.Vfs {
	public class TestAsync {
		private static MainLoop loop;
		private static Handle handle;
	
		static void Main (string[] args)
		{
			if (args.Length != 1) {
				Console.WriteLine ("Usage: TestAsync &lt;uri&gt;");
				return;
			}
		
			Gnome.Vfs.Vfs.Initialize ();

			Gnome.Vfs.Uri uri = new Gnome.Vfs.Uri (args[0]);
			handle = Async.Open (uri, OpenMode.Read,
					     (int)Async.Priority.Default,
					     new Gnome.Vfs.AsyncCallback (OnOpen));
			
			loop = new MainLoop ();
			loop.Run ();
			
			Gnome.Vfs.Vfs.Shutdown ();
		}


		private static void OnOpen (Handle handle, Result result)
		{
			Console.WriteLine ("Uri opened: {0}", result);
			if (result != Result.Ok) {
				loop.Quit ();
				return;
			}
			
			byte[] buffer = new byte[1024];
			Async.Read (handle, out buffer[0], (uint)buffer.Length,
				    new AsyncReadCallback (OnRead));
		}
		
		private static void OnRead (Handle handle, Result result, byte[] buffer,
					    ulong bytes_requested, ulong bytes_read)
		{
			Console.WriteLine ("Read: {0}", result);
			if (result != Result.Ok &amp;&amp; result != Result.ErrorEof) {
				loop.Quit ();
				return;
			}

			UTF8Encoding utf8 = new UTF8Encoding ();
			Console.WriteLine ("read ({0} bytes) : '{1}'", bytes_read,
					   utf8.GetString (buffer, 0, (int)bytes_read));

			if (bytes_read != 0)
				Async.Read (handle, out buffer[0], (uint)buffer.Length,
					    new AsyncReadCallback (OnRead));
			else
				Async.Close (handle, new Gnome.Vfs.AsyncCallback (OnClose));
		}
		
		private static void OnClose (Handle handle, Result result)
		{
			Console.WriteLine ("Close: {0}", result);
			loop.Quit ();
		}
	}
}
</code></example></remarks>
  </Docs>
  <Base>
    <BaseTypeName>System.Object</BaseTypeName>
  </Base>
  <Interfaces />
  <Members>
    <Member MemberName="Cancel">
      <MemberSignature Language="C#" Value="public static void Cancel (Gnome.Vfs.Handle handle);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="handle" Type="Gnome.Vfs.Handle" />
      </Parameters>
      <Docs>
        <summary>Cancel an asynchronous operation and close all its callbacks. Its possible to still receive another call or two on the callback.</summary>
        <param name="handle">
          <see cref="T:Gnome.Vfs.Handle" /> of the async operation to be cancelled</param>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
    <Member MemberName="Close">
      <MemberSignature Language="C#" Value="public static void Close (Gnome.Vfs.Handle handle, Gnome.Vfs.AsyncCallback callback);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="handle" Type="Gnome.Vfs.Handle" />
        <Parameter Name="callback" Type="Gnome.Vfs.AsyncCallback" />
      </Parameters>
      <Docs>
        <summary>Close a handle opened with <see cref="M:Gnome.Vfs.Async.Open" />. When the close has completed, <see cref="T:Gnome.Vfs.AsyncCallback" /> will be called with the <see cref="T:Gnome.Vfs.Result" /> of the operation.</summary>
        <param name="handle">a <see cref="T:Gnome.Vfs.Handle" /> to close</param>
        <param name="callback">a <see cref="T:Gnome.Vfs.AsyncCallback" /> to be called when the operation is complete</param>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
    <Member MemberName="Create">
      <MemberSignature Language="C#" Value="public static Gnome.Vfs.Handle Create (string uri, Gnome.Vfs.OpenMode mode, bool exclusive, Gnome.Vfs.FilePermissions perm, int priority, Gnome.Vfs.AsyncCallback callback);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>Gnome.Vfs.Handle</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="uri" Type="System.String" />
        <Parameter Name="mode" Type="Gnome.Vfs.OpenMode" />
        <Parameter Name="exclusive" Type="System.Boolean" />
        <Parameter Name="perm" Type="Gnome.Vfs.FilePermissions" />
        <Parameter Name="priority" Type="System.Int32" />
        <Parameter Name="callback" Type="Gnome.Vfs.AsyncCallback" />
      </Parameters>
      <Docs>
        <summary>Create a file at uri according to mode <see cref="T:Gnome.Vfs.OpenMode" />, with permissions <see cref="T:Gnome.Vfs.FilePermissions" />. When the create has been completed <see cref="T:Gnome.Vfs.AsyncCallback" /> will be called with the <see cref="T:Gnome.Vfs.Result" />.</summary>
        <param name="uri">the URI to create a file at.</param>
        <param name="mode">mode to leave the file opened in after creation (or <see cref="M:Gnome.Vfs.OpenMode.None" /> to leave the file closed after creation).</param>
        <param name="exclusive">Whether the file should be created in "exclusive" mode: i.e. if this flag is nonzero, operation will fail if a file with the same name already exists.</param>
        <param name="perm">Bitmap representing the permissions for the newly created file (Unix style).</param>
        <param name="priority">a value from <see cref="M:Gnome.Vfs.Async+Priority.Min" /> to <see cref="T:Gnome.Vfs.Async+Priority.Max" /> (normally should be <see cref="T:Gnome.Vfs.Async+Priority.Default" />) indicating the priority to assign this job in allocating threads from the thread pool.</param>
        <param name="callback">a <see cref="T:Gnome.Vfs.AsyncCallback" /> to be called when the operation is complete.</param>
        <returns>a <see cref="T:Gnome.Vfs.Handle" /></returns>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
    <Member MemberName="Create">
      <MemberSignature Language="C#" Value="public static Gnome.Vfs.Handle Create (Gnome.Vfs.Uri uri, Gnome.Vfs.OpenMode mode, bool exclusive, Gnome.Vfs.FilePermissions perm, int priority, Gnome.Vfs.AsyncCallback callback);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>Gnome.Vfs.Handle</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="uri" Type="Gnome.Vfs.Uri" />
        <Parameter Name="mode" Type="Gnome.Vfs.OpenMode" />
        <Parameter Name="exclusive" Type="System.Boolean" />
        <Parameter Name="perm" Type="Gnome.Vfs.FilePermissions" />
        <Parameter Name="priority" Type="System.Int32" />
        <Parameter Name="callback" Type="Gnome.Vfs.AsyncCallback" />
      </Parameters>
      <Docs>
        <summary>Create a file at <see cref="T:Gnome.Vfs.Uri" /> according to mode <see cref="T:Gnome.Vfs.OpenMode" />, with permissions <see cref="T:Gnome.Vfs.FilePermissions" />. When the create has been completed <see cref="T:Gnome.Vfs.AsyncCallback" /> will be called with the <see cref="T:Gnome.Vfs.Result" />.</summary>
        <param name="uri">the <see cref="T:Gnome.Vfs.Uri" /> to create a file at.</param>
        <param name="mode">mode to leave the file opened in after creation (or <see cref="M:Gnome.Vfs.OpenMode.None" /> to leave the file closed after creation).</param>
        <param name="exclusive">Whether the file should be created in "exclusive" mode: i.e. if this flag is nonzero, operation will fail if a file with the same name already exists.</param>
        <param name="perm">Bitmap representing the permissions for the newly created file (Unix style).</param>
        <param name="priority">a value from <see cref="M:Gnome.Vfs.Async+Priority.Min" /> to <see cref="T:Gnome.Vfs.Async+Priority.Max" /> (normally should be <see cref="T:Gnome.Vfs.Async+Priority.Default" />) indicating the priority to assign this job in allocating threads from the thread pool.</param>
        <param name="callback">a <see cref="T:Gnome.Vfs.AsyncCallback" /> to be called when the operation is complete.</param>
        <returns>a <see cref="T:Gnome.Vfs.Handle" /></returns>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
    <Member MemberName="Open">
      <MemberSignature Language="C#" Value="public static Gnome.Vfs.Handle Open (string uri, Gnome.Vfs.OpenMode mode, int priority, Gnome.Vfs.AsyncCallback callback);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>Gnome.Vfs.Handle</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="uri" Type="System.String" />
        <Parameter Name="mode" Type="Gnome.Vfs.OpenMode" />
        <Parameter Name="priority" Type="System.Int32" />
        <Parameter Name="callback" Type="Gnome.Vfs.AsyncCallback" />
      </Parameters>
      <Docs>
        <summary>Open uri according to mode <see cref="T:Gnome.Vfs.OpenMode" />. Once the file has been successfully opened, <see cref="T:Gnome.Vfs.AsyncCallback" /> will be called with the <see cref="T:Gnome.Vfs.Result" />.</summary>
        <param name="uri">
          <see cref="T:System.String" /> of the URI to open.</param>
        <param name="mode">
          <see cref="T:Gnome.Vfs.OpenMode" />.</param>
        <param name="priority">a value from <see cref="M:Gnome.Vfs.Async+Priority.Min" /> to <see cref="T:Gnome.Vfs.Async+Priority.Max" /> (normally should be <see cref="T:Gnome.Vfs.Async+Priority.Default" />) indicating the priority to assign this job in allocating threads from the thread pool.</param>
        <param name="callback">a <see cref="T:Gnome.Vfs.AsyncCallback" /> to be called when the operation is complete.</param>
        <returns>a <see cref="T:Gnome.Vfs.Handle" /></returns>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
    <Member MemberName="Open">
      <MemberSignature Language="C#" Value="public static Gnome.Vfs.Handle Open (Gnome.Vfs.Uri uri, Gnome.Vfs.OpenMode mode, int priority, Gnome.Vfs.AsyncCallback callback);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>Gnome.Vfs.Handle</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="uri" Type="Gnome.Vfs.Uri" />
        <Parameter Name="mode" Type="Gnome.Vfs.OpenMode" />
        <Parameter Name="priority" Type="System.Int32" />
        <Parameter Name="callback" Type="Gnome.Vfs.AsyncCallback" />
      </Parameters>
      <Docs>
        <summary>Open <see cref="T:Gnome.Vfs.Uri" /> according to mode <see cref="T:Gnome.Vfs.OpenMode" />. Once the file has been successfully opened, <see cref="T:Gnome.Vfs.AsyncCallback" /> will be called with the <see cref="T:Gnome.Vfs.Result" />.</summary>
        <param name="uri">
          <see cref="T:Gnome.Vfs.Uri" /> to open.</param>
        <param name="mode">
          <see cref="T:Gnome.Vfs.OpenMode" />.</param>
        <param name="priority">a value from <see cref="M:Gnome.Vfs.Async+Priority.Min" /> to <see cref="T:Gnome.Vfs.Async+Priority.Max" /> (normally should be <see cref="T:Gnome.Vfs.Async+Priority.Default" />) indicating the priority to assign this job in allocating threads from the thread pool.</param>
        <param name="callback">a <see cref="T:Gnome.Vfs.AsyncCallback" /> to be called when the operation is complete.</param>
        <returns>a <see cref="T:Gnome.Vfs.Handle" /></returns>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
    <Member MemberName="Read">
      <MemberSignature Language="C#" Value="public static void Read (Gnome.Vfs.Handle handle, out byte buffer, uint bytes, Gnome.Vfs.AsyncReadCallback callback);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="handle" Type="Gnome.Vfs.Handle" />
        <Parameter Name="buffer" Type="System.Byte&amp;" RefType="out" />
        <Parameter Name="bytes" Type="System.UInt32" />
        <Parameter Name="callback" Type="Gnome.Vfs.AsyncReadCallback" />
      </Parameters>
      <Docs>
        <summary>Read number of bytes from the file pointed to by <see cref="T:Gnome.Vfs.Handle" /> into byte array buffer. When the operation is complete, <see cref="T:Gnome.Vfs.AsyncReadCallback" /> will be called with the <see cref="T:Gnome.Vfs.Result" /> of the operation.</summary>
        <param name="handle">
          <see cref="T:Gnome.Vfs.Handle" /> for the file to be read.</param>
        <param name="buffer">allocated array of <see cref="T:System.Byte" /> to read into. Needs to be passed as "out buffer[0]".</param>
        <param name="bytes">number of bytes to read.</param>
        <param name="callback">a <see cref="T:Gnome.Vfs.AsyncReadCallback" /> to be called when the operation is complete.</param>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
    <Member MemberName="Seek">
      <MemberSignature Language="C#" Value="public static void Seek (Gnome.Vfs.Handle handle, Gnome.Vfs.SeekPosition whence, long offset, Gnome.Vfs.AsyncCallback callback);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="handle" Type="Gnome.Vfs.Handle" />
        <Parameter Name="whence" Type="Gnome.Vfs.SeekPosition" />
        <Parameter Name="offset" Type="System.Int64" />
        <Parameter Name="callback" Type="Gnome.Vfs.AsyncCallback" />
      </Parameters>
      <Docs>
        <summary>Set the current position for reading/writing through <see cref="T:Gnome.Vfs.Handle" />. When the operation is complete, <see cref="T:Gnome.Vfs.AsyncCallback" /> will be called with the <see cref="T:Gnome.Vfs.Result" /> of the operation.</summary>
        <param name="handle">
          <see cref="T:Gnome.Vfs.Handle" /> for which the current position must be changed.</param>
        <param name="whence">
          <see cref="T:Gnome.Vfs.SeekPosition" /> value representing the starting position.</param>
        <param name="offset">number of bytes to skip from the position specified by <see cref="T:Gnome.Vfs.SeekPosition" /> (a positive value means to move forward; a negative one to move backwards).</param>
        <param name="callback">a <see cref="T:Gnome.Vfs.AsyncCallback" /> to be called when the operation is complete.</param>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
    <Member MemberName="Write">
      <MemberSignature Language="C#" Value="public static void Write (Gnome.Vfs.Handle handle, out byte buffer, uint bytes, Gnome.Vfs.AsyncWriteCallback callback);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="handle" Type="Gnome.Vfs.Handle" />
        <Parameter Name="buffer" Type="System.Byte&amp;" RefType="out" />
        <Parameter Name="bytes" Type="System.UInt32" />
        <Parameter Name="callback" Type="Gnome.Vfs.AsyncWriteCallback" />
      </Parameters>
      <Docs>
        <summary>Write number of bytes from buffer byte array into the file pointed to be <see cref="T:Gnome.Vfs.Handle" />. When the operation is complete, <see cref="T:Gnome.Vfs.AsyncWriteCallback" /> will be called with the <see cref="T:Gnome.Vfs.Result" /> of the operation.</summary>
        <param name="handle">
          <see cref="T:Gnome.Vfs.Handle" /> for the file to be written.</param>
        <param name="buffer">
          <see cref="T:System.Byte" /> array containing data to be written. Needs to be passed as "out buffer[0]".</param>
        <param name="bytes">number of bytes to write.</param>
        <param name="callback">a <see cref="T:Gnome.Vfs.AsyncWriteCallback" /> to be called when the operation is complete.</param>
        <remarks>To be added</remarks>
      </Docs>
    </Member>
  </Members>
</Type>