ReadTagAsync Method

public IAsyncOperation<RasterTagMetadata> ReadTagAsync( 
   ILeadStream stream,
   int pageNumber,
   int id
)

'Declaration
 
Public Function ReadTagAsync( _
   ByVal stream As ILeadStream, _
   ByVal pageNumber As Integer, _
   ByVal id As Integer _
) As IAsyncOperation(Of RasterTagMetadata)

'Usage
 
Dim instance As RasterCodecs
Dim stream As ILeadStream
Dim pageNumber As Integer
Dim id As Integer
Dim value As IAsyncOperation(Of RasterTagMetadata)
 
value = instance.ReadTagAsync(stream, pageNumber, id)

public IAsyncOperation<RasterTagMetadata> ReadTagAsync( 
   ILeadStream stream,
   int pageNumber,
   int id
)

 function Leadtools.Codecs.RasterCodecs.ReadTagAsync( 
   stream ,
   pageNumber ,
   id 
)

public:
IAsyncOperation<RasterTagMetadata^>^ ReadTagAsync( 
   ILeadStream^ stream,
   int pageNumber,
   int id
) 

Parameters

stream

A Leadtools.ILeadStream containing the input file image data.

pageNumber

1-based index of the page from which to read the tag.

id

Tag to identify the data in the TIFF file. Use the same tag that you specified in the WriteTag(String,Int32,RasterTagMetadata). Examples of registered tags are:

Value	Meaning
0x8298	Copyright comment
0x8769	General Exif comments
0x8825	Exif GPS comments
0x80A4	Annotation TIFF tag

Return Value

This method is provided to support TIFF tags that you define. If no such tag exists in the image, this method will return a null reference (Nothing in Visual Basic).

To read all the tags stored in a file, use ReadTags(String,Int32)

You can use TagsSupported to determine whether a certain file format supports tags.

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
Implementing TIFF Comments and Tags
EnumTags(string, int) Method
EnumTags(Stream, int) Method