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

Reference

RasterCodecs Class
RasterCodecs Members
Implementing GeoKeys (GeoTIFF tags)
Implementing TIFF Comments and Tags