public RasterTagMetadata ReadGeoKey(
Stream stream,
int pageNumber,
int id
)
- (nullable LTRasterTagMetadata *)readGeoKey:(NSUInteger)tagId
fromStream:(LTLeadStream *)stream
pageNumber:(NSInteger)pageNumber
error:(NSError **)error
public RasterTagMetadata readGeoKey(ILeadStream stream, int pageNumber, int id)
public:
RasterTagMetadata^ ReadGeoKey(
Stream^ stream,
int pageNumber,
int id
)
def ReadGeoKey(self,stream,pageNumber,id):
stream
A Stream 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. |
The GeoKey data.
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.
The most efficient way of reading the GeoKeys in a file is to enumerate them with EnumGeoKeys and then read each GeoKey with ReadGeoKey.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
IList<RasterTagMetadata> myGeoKeys;
void EnumGeoKeysExample(string srcFileName, string destFileName)
{
RasterCodecs codecs = new RasterCodecs();
geoKeySrcFileName = srcFileName;
myGeoKeys = new List<RasterTagMetadata>();
codecs.GeoKeyFound += new EventHandler<CodecsEnumGeoKeysEventArgs>(codecs_GeyKeyFound);
codecs.EnumGeoKeys(srcFileName, 1);
codecs.GeoKeyFound -= new EventHandler<CodecsEnumGeoKeysEventArgs>(codecs_GeyKeyFound);
// We read all the tags now, save them to the file
Debug.WriteLine("{0} GeoKeys read, saving them to the destination file", myGeoKeys.Count);
codecs.WriteGeoKeys(destFileName, 1, myGeoKeys);
// Clean up
codecs.Dispose();
}
void codecs_GeyKeyFound(object sender, CodecsEnumGeoKeysEventArgs e)
{
Debug.WriteLine("GeoKey: Id={0}, Count={1}, Type={2}, Data Length={3}, Data=, Cancel={4}", e.Id, e.Count, e.MetadataType, e.Buffer.Length, e.Cancel);
// Load this GeoKey
RasterCodecs codecs = sender as RasterCodecs;
RasterTagMetadata geoKey = codecs.ReadGeoKey(geoKeySrcFileName, 1, e.Id);
byte[] data = geoKey.GetData();
for (int i = 0; i < data.Length; i++)
Debug.WriteLine("{0:X} ", data[i].ToString());
// Add it to our collection
myGeoKeys.Add(geoKey);
e.ToRasterTagMetadata();
}
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