ReadMarkersAsync Method

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public IAsyncOperation<IVector<RasterMarkerMetadata>> ReadMarkersAsync( 
   ILeadStream stream
)

'Declaration
 
Public Function ReadMarkersAsync( _
   ByVal stream As ILeadStream _
) As IAsyncOperation(Of IVector(Of RasterMarkerMetadata))

'Usage
 
Dim instance As RasterCodecs
Dim stream As ILeadStream
Dim value As IAsyncOperation(Of IVector(Of RasterMarkerMetadata))
 
value = instance.ReadMarkersAsync(stream)

public IAsyncOperation<IVector<RasterMarkerMetadata>> ReadMarkersAsync( 
   ILeadStream stream
)

 function Leadtools.Codecs.RasterCodecs.ReadMarkersAsync( 
   stream 
)

public:
IAsyncOperation<IVector<RasterMarkerMetadata^>^>^ ReadMarkersAsync( 
   ILeadStream^ stream
)

Parameters

stream: A Leadtools.ILeadStream containing the input file image data.

Return Value

When this method completes, it returns a collection of Leadtools.RasterMarkerMetadata objects containing the metadata marker data.

This method reads all the metadata markers from a file, and returns a collection of the markers.

For Exif files, this metadata collection will contain all the Exif and GPS comments, stored in APP1. It will also contain the audio information stored in APP2.

If the file contains no marker, then this method will return an empty collection.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Private Sub ReadMarkersFromStreamExample(ByVal theStream As Stream)
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim markers As RasterCollection(Of RasterMarkerMetadata) = codecs.ReadMarkers(theStream)
   Console.WriteLine("{0} markers found with the following ID's:", markers.Count)
   For Each marker As RasterMarkerMetadata In markers
      Console.WriteLine(marker.Id)
   Next marker

   codecs.Dispose()
End Sub

void ReadMarkersFromStreamExample(Stream theStream)
{
    RasterCodecs codecs = new RasterCodecs();
    RasterCollection<RasterMarkerMetadata> markers = codecs.ReadMarkers(theStream);
    Console.WriteLine("{0} markers found with the following ID's:", markers.Count);
    foreach (RasterMarkerMetadata marker in markers)
        Console.WriteLine(marker.Id);

    codecs.Dispose();
}

public void ReadMarkersFromStreamExample(Stream inStreamExif)
{
   RasterCodecs codecs = new RasterCodecs();
   RasterCollection<RasterMarkerMetadata> markers = codecs.ReadMarkers(inStreamExif);
   Debug.WriteLine("{0} markers found with the following ID's:", markers.Count);
   foreach(RasterMarkerMetadata marker in markers)
      Debug.WriteLine(marker.Id);
}

Public Sub ReadMarkersFromStreamExample(ByVal inStreamExif As Stream)
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim markers As RasterCollection(Of RasterMarkerMetadata) = codecs.ReadMarkers(inStreamExif)
   Debug.WriteLine("{0} markers found with the following ID's:", markers.Count)
   For Each marker As RasterMarkerMetadata In markers
      Debug.WriteLine(marker.Id)
   Next marker
End Sub

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

RasterCodecs Class
RasterCodecs Members
Working with Markers