ReadGeoKeysAsync Method

public IAsyncOperation<IVector<RasterTagMetadata>> ReadGeoKeysAsync( 
   ILeadStream stream,
   int pageNumber
)

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

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

public IAsyncOperation<IVector<RasterTagMetadata>> ReadGeoKeysAsync( 
   ILeadStream stream,
   int pageNumber
)

 function Leadtools.Codecs.RasterCodecs.ReadGeoKeysAsync( 
   stream ,
   pageNumber 
)

public:
IAsyncOperation<IVector<RasterTagMetadata^>^>^ ReadGeoKeysAsync( 
   ILeadStream^ stream,
   int pageNumber
) 

Parameters

stream

A Leadtools.ILeadStream containing the input TIFF image data.

pageNumber

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

Return Value

To read a specific geo key stored in a file, use ReadGeoKey(String,Int32,Int32) and to enumerate all the GeoKeys stored in a file use EnumGeoKeys(String,Int32).

This method will throw an exception if the file format does not support GeoKeys. To determine whether a file format supports GeoKeys, use GeoKeysSupported. You can also automatically load all the GeoKeys stored in a file during a load operation by setting the CodecsLoadOptions.GeoKeys property to true. The GeoKeys data will be stored in the resulting image RasterImage.GeoKeys collection.

To load all the GeoKeys stored in a disk file, use ReadGeoKeys(String,Int32).

Target Platforms

Reference

RasterCodecs Class
RasterCodecs Members
GeoKeysSupported Method
ReadGeoKeys(String,Int32) Method
EnumGeoKeys(String,Int32) Method
CommentsSupported Method
GeoKeysSupported Method
GeoKeys Property
RasterImage.GeoKeys
Working with Markers
Implementing TIFF Comments and Tags
TIFF File Comments
Implementing GeoKeys (GeoTIFF tags)
Leadtools.RasterCommentMetadataType