public IList<RasterTagMetadata> ReadTagsWithOffsets(
string fileName,
int pageNumber,
out long[] offsets
)
- (nullable NSArray<LTRasterTagMetadata *> *)readTagsFromFile:(NSString *)file
pageNumber:(NSInteger)pageNumber
offsets:(NSMutableArray<NSNumber *> *)offsets
error:(NSError **)error
public:
IList<RasterTagMetadata^>^ ReadTagsWithOffsets(
String^ fileName,
int pageNumber,
[Out] array<int64> offsets
)
def ReadTagsWithOffsets(self,fileName,pageNumber,offsets):
fileName
A String containing the input file name.
pageNumber
1-based index of the page from which to read the tags.
offsets
An array that contains the offsets for each tag.
A collection of RasterTagMetadata containing all the tags found in the file. If the file does not contain any tags, an empty collection will be returned. If the file format does not support tags, an exception will be thrown.
To read a specific tag stored in a file, use ReadTag and to enumerate all the tag ids (but not the data) stored in a file use EnumTags.
This method will throw an exception if the file format does not support tags. To determine whether a file format supports tags, use TagsSupported. You can also automatically load all the tags stored in a file during a load operation by setting the CodecsLoadOptions.Tags property to true. The tags data will be stored in the resulting image RasterImage.Tags collection.
To load all the tags stored in a stream containing the image data, use ReadTags.
This example will load all the tags, with their offsets, from a file.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
public void ReadTagsWithOffsetsExample()
{
// Prompt the user for an image file
string imageFileName = PromptForFileName();
// Initialize LEADTOOLS
using (RasterCodecs codecs = new RasterCodecs())
{
// Get the file format
RasterImageFormat format;
using (CodecsImageInfo info = codecs.GetInformation(imageFileName, false))
{
format = info.Format;
}
// Load the tags, with their offsets
IList<RasterTagMetadata> tags = null;
long[] offsets = null;
if (RasterCodecs.TagsSupported(format))
tags = codecs.ReadTagsWithOffsets(imageFileName, 1, out offsets);
string txtFileName = Path.Combine(
Path.GetDirectoryName(imageFileName),
Path.GetFileNameWithoutExtension(imageFileName) + "_metadata.txt");
using (StreamWriter writer = File.CreateText(txtFileName))
{
// Write the tags
WriteTags(writer, "Tags", tags, offsets);
}
// Show the text file we created
System.Diagnostics.Process.Start(txtFileName);
}
}
private static void WriteTags(StreamWriter writer, string name, IList<RasterTagMetadata> tags, long[] offsets)
{
writer.WriteLine("{0}:", name);
if (tags != null)
{
int x = 0;
foreach (RasterTagMetadata tag in tags)
{
writer.WriteLine("Id: 0x{0}, offset: {1}", tag.Id.ToString("X"), offsets[x]);
x++;
}
}
else
{
writer.WriteLine("Not supported");
}
writer.WriteLine();
}
import java.io.*;
import java.net.*;
import java.nio.file.Paths;
import java.util.*;
import java.time.Instant;
import java.time.Duration;
import org.junit.*;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
import static org.junit.Assert.*;
import leadtools.*;
import leadtools.codecs.*;
import leadtools.codecs.RasterCodecs.FeedCallbackThunk;
import leadtools.drawing.internal.*;
import leadtools.imageprocessing.*;
import leadtools.imageprocessing.color.ChangeIntensityCommand;
import leadtools.svg.*;
public void readTagsWithOffsetsExample() throws IOException {
final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images";
String imageFileName = combine(LEAD_VARS_IMAGES_DIR, "ocr1-4.tif");
RasterCodecs codecs = new RasterCodecs();
// Get the file format
RasterImageFormat format;
CodecsImageInfo info = codecs.getInformation(imageFileName, false);
format = info.getFormat();
// Load the tags, with their offsets
List<RasterTagMetadata> tags = null;
long[][] offsets = new long[1000][1000];
if (RasterCodecs.tagsSupported(format)) {
ILeadStream imageFileStream = LeadStreamFactory.create(imageFileName);
tags = codecs.readTagsWithOffsets(imageFileStream, 1, offsets);
}
File imageFile = new File(imageFileName);
String imageFileWithoutExtension = imageFileName.substring(0, imageFileName.indexOf("."));
String txtFileName = imageFileWithoutExtension + "_metadata.txt";
FileWriter writer = new FileWriter(txtFileName);
// Write the tags
writeTags(writer, "Tags", tags, offsets);
assertTrue("File unsuccessfully created", imageFile.exists());
}
private static void writeTags(FileWriter writer, String name, List<RasterTagMetadata> tags, long[][] offsets)
throws IOException {
writer.write(name + ":\n");
if (tags != null) {
int x = 0;
for (RasterTagMetadata tag : tags) {
writer.write(String.format("Id: 0x%s, offset: %s%n", tag.getId(), offsets[x]));
x++;
}
} else {
writer.write("Not supported\n");
}
writer.write("\n");
}
ReadTag(String,Int32,Int32) Method
Implementing TIFF Comments and Tags
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