public static void Main()
{
// Register the extender callback
// It's a good idea to keep track of the previous tag extender (if any) so that we can call it
// from our extender allowing a chain of customizations to take effect.
m_parentExtender = Tiff.SetTagExtender(TagExtender);
File.Copy(@"Sample Data\dummy.tif", @"Sample Data\ToBeModifed.tif", true);
string existingTiffName = @"Sample Data\ToBeModifed.tif";
using (Tiff image = Tiff.Open(existingTiffName, "a"))
{
// we should rewind to first directory (first image) because of append mode
image.SetDirectory(0);
// set the custom tag
string value = "<GDALMetadata>\n<Item name=\"IMG_GUID\">" +
"817C0168-0688-45CD-B799-CF8C4DE9AB2B</Item>\n<Item" +
" name=\"LAYER_TYPE\" sample=\"0\">athematic</Item>\n</GDALMetadata>";
image.SetField(TIFFTAG_GDAL_METADATA, value);
// rewrites directory saving new tag
image.CheckpointDirectory();
}
// restore previous tag extender
Tiff.SetTagExtender(m_parentExtender);
}
public static void Main()
{
string fileName = "random.tif";
int totalPages = 3;
int width = 100;
int height = 150;
using (Tiff output = Tiff.Open(fileName, "w"))
{
for (short page = 0; page <= totalPages - 1; page++)
{
if (page != 0)
{
// save previous directory data
output.WriteDirectory();
// create new directory and make it current
output.CreateDirectory();
output.SetDirectory(page);
}
// setup image properties
output.SetField(TiffTag.IMAGEWIDTH, width);
output.SetField(TiffTag.IMAGELENGTH, height);
output.SetField(TiffTag.SAMPLESPERPIXEL, 1);
output.SetField(TiffTag.BITSPERSAMPLE, 16);
output.SetField(TiffTag.ORIENTATION, Orientation.TOPLEFT);
output.SetField(TiffTag.ROWSPERSTRIP, height);
output.SetField(TiffTag.XRESOLUTION, 88.0);
output.SetField(TiffTag.YRESOLUTION, 88.0);
output.SetField(TiffTag.RESOLUTIONUNIT, ResUnit.CENTIMETER);
output.SetField(TiffTag.PLANARCONFIG, PlanarConfig.CONTIG);
output.SetField(TiffTag.PHOTOMETRIC, Photometric.MINISBLACK);
output.SetField(TiffTag.COMPRESSION, Compression.NONE);
output.SetField(TiffTag.FILLORDER, FillOrder.MSB2LSB);
// cause tags data to be put in an image
output.CheckpointDirectory();
// create image data
Random random = new Random();
for (int i = 0; i <= height - 1; i++)
{
short[] samples = new short[width];
for (int j = 0; j <= width - 1; j++)
{
samples[j] = Convert.ToInt16(random.Next(0, short.MaxValue));
}
byte[] buf = new byte[samples.Length * 2];
Buffer.BlockCopy(samples, 0, buf, 0, buf.Length);
output.WriteScanline(buf, i);
}
}
}
System.Diagnostics.Process.Start(fileName);
}
private static void SetTags(Tiff sourceTiff, string name, double north, double west, int width, int height, Tiff geoTiff)
{
//LibTiff.net doesn't seem to be thread safe
lock (sourceTiff)
{
CopyTags(sourceTiff, geoTiff);
geoTiff.SetField(TiffTag.DOCUMENTNAME, name + ".tif");
geoTiff.SetField(TiffTag.IMAGEWIDTH, width);
geoTiff.SetField(TiffTag.IMAGELENGTH, height);
SetGeoTiffTags(sourceTiff, north, west, geoTiff);
}
geoTiff.CheckpointDirectory();
}
private static void AddTag(string dir, string value)
{
// Register the extender callback
m_parentExtender = Tiff.SetTagExtender(TagExtender);
using (Tiff image = Tiff.Open(dir, "a"))
{
image.SetDirectory((short)(image.NumberOfDirectories() - 1));
// we should rewind to first directory (first image) because of append mode
// set the custom tag
image.SetField(TIFFTAG_CellTool_METADATA, value);
// rewrites directory saving new tag
image.CheckpointDirectory();
}
// restore previous tag extender
Tiff.SetTagExtender(m_parentExtender);
}
public void TestAppendedNulls()
{
// A test to see if nulls get appended to custom ascii tags
// when they don't have a valid FieldInfo object registered.
// Contributed by Alex J. Kennedy
int freetag = 42117;
int freetag2 = 42118;
string value = "abc";
string value2 = "def";
byte[] expectedReadValue = new byte[] { (byte)'a', (byte)'b', (byte)'c', (byte)'\0' };
string filename = "testAppendedNulls.tif";
// Clean
if (File.Exists(filename))
{
File.Delete(filename);
}
// Create a basic tiff image
CreateBasicTif(filename);
// Register the new tag
TagToWrite = freetag;
Tiff.SetTagExtender(TagExtender);
using (Tiff image = Tiff.Open(filename, "a"))
{
image.SetDirectory(0);
// write "abc" to directory 0, tag 42117
image.SetField((TiffTag)freetag, value);
// save
image.CheckpointDirectory();
}
// Reset TagExtender
Tiff.SetTagExtender(null);
// Try to read it back in
using (Tiff image = Tiff.Open(filename, "r"))
{
image.SetDirectory(0);
FieldValue[] fv = image.GetField((TiffTag)freetag);
Assert.AreEqual(2, fv.Length);
// Ensure that a null was appended.
byte[] readValue = (byte[])(fv[1].Value);
Assert.AreEqual(4, (int)fv[0].Value);
Assert.AreEqual(4, readValue.Length);
Assert.AreEqual('a', readValue[0]);
Assert.AreEqual('b', readValue[1]);
Assert.AreEqual('c', readValue[2]);
Assert.AreEqual('\0', readValue[3]);
}
// Now write a different tag to see if it appends a null char to 42117
TagToWrite = freetag2;
Tiff.SetTagExtender(TagExtender);
using (Tiff image = Tiff.Open(filename, "a"))
{
image.SetDirectory(0);
// write "def" to directory 0, tag 42118
image.SetField((TiffTag)freetag2, value2);
// save
image.CheckpointDirectory();
}
Tiff.SetTagExtender(null);
// Read in tag 42117 to make sure it doesn't have an extra null appended
using (Tiff image = Tiff.Open(filename, "r"))
{
image.SetDirectory(0);
TiffFieldInfo tfi = image.FindFieldInfo((TiffTag)freetag, TiffType.ANY);
TiffFieldInfo tfi2 = image.FindFieldInfo((TiffTag)freetag2, TiffType.ANY);
FieldValue[] fv = image.GetField((TiffTag)freetag);
Assert.AreEqual(2, fv.Length);
// Ensure that only one null was appended.
byte[] readValue = (byte[])(fv[1].Value);
Assert.AreEqual(4, (int)fv[0].Value);
Assert.AreEqual(4, readValue.Length);
Assert.AreEqual('a', readValue[0]);
Assert.AreEqual('b', readValue[1]);
Assert.AreEqual('c', readValue[2]);
Assert.AreEqual('\0', readValue[3]);
}
}