ReadGeoKeyAsync Method

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

'Declaration
 
Public Function ReadGeoKeyAsync( _
   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.ReadGeoKeyAsync(stream, pageNumber, id)

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

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

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

Parameters

stream

A Leadtools.ILeadStream containing the input file data.

pageNumber

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

id

GeoKey ID. Values of the GeoKey ID range between 0 and 65535. Possible ranges are:

Range	Meaning
0..1023	Do not use; reserved for future use.
1024..2047	GeoTIFF Configuration Keys.
2048..3071	Geographic/Geocentric CS Parameter Keys.
3072..4095	Projected CS Parameter Keys.
4096..5119	Vertical CS Parameter Keys.
5120..32767	Reserved.
32768..65535	Private use - use to store your own data.

Return Value

You can use this method to obtain the GeoKey data from a particular file.

If no such GeoKey exists in the image, this method will return a null reference (Nothing in Visual Basic).

The most efficient way of reading the GeoKeys in a file is to enumerate them with EnumGeoKeys(String,Int32) and then read each GeoKey with ReadGeoKey(String,Int32,Int32).

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 GeoKeys (GeoTIFF tags)
Implementing TIFF Comments and Tags