public void TestUserCommentDescription_BlankAscii()
{
var commentBytes = Encoding.UTF8.GetBytes("ASCII\x0\x0\x0 ");
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal(string.Empty, descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUserCommentDescription_AsciiHeaderAsciiEncoding()
{
var commentBytes = Encoding.UTF8.GetBytes("ASCII\x0\x0This is a comment");
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal("This is a comment", descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUnicodeComment_Ascii()
{
var commentBytes = new byte[] { 65, 83, 67, 73, 73, 0, 0, 0, 73, 32, 97, 109, 32, 97, 32, 99, 111, 109, 109, 101, 110, 116, 46, 32, 89, 101, 121, 46, 0 };
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal("I am a comment. Yey.", descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUserCommentDescription_ZeroLengthAscii1()
{
// the 10-byte encoding region is only partially full
var commentBytes = Encoding.UTF8.GetBytes("ASCII\x0\x0\x0");
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal("ASCII", descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUserCommentDescription_BlankAscii()
{
var commentBytes = Encoding.UTF8.GetBytes("ASCII\x0\x0\x0 ");
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal(string.Empty, descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUserCommentDescription_AsciiHeaderAsciiEncoding()
{
var commentBytes = Encoding.UTF8.GetBytes("ASCII\x0\x0This is a comment");
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal("This is a comment", descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUnicodeComment_Ascii()
{
var commentBytes = new byte[] { 65, 83, 67, 73, 73, 0, 0, 0, 73, 32, 97, 109, 32, 97, 32, 99, 111, 109, 109, 101, 110, 116, 46, 32, 89, 101, 121, 46, 0 };
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal("I am a comment. Yey.", descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUserCommentDescription_ZeroLengthAscii2()
{
// fill the 10-byte encoding region
var commentBytes = Encoding.UTF8.GetBytes("ASCII\x0\x0\x0\x0\x0");
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal(string.Empty, descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUserCommentDescription_ZeroLengthAscii1()
{
// the 10-byte encoding region is only partially full
var commentBytes = Encoding.UTF8.GetBytes("ASCII\x0\x0\x0");
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal("ASCII", descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUnicodeComment_ActualBytes()
{
var commentBytes = new byte[] { 85, 78, 73, 67, 79, 68, 69, 0, 84, 0, 104, 0, 105, 0, 115, 0, 32, 0, 109, 0, 97, 0, 114, 0, 109, 0, 111, 0, 116, 0, 32, 0, 105, 0, 115, 0, 32, 0, 103, 0, 101, 0, 116, 0, 116, 0, 105, 0, 110, 0, 103, 0, 32
, 0, 99, 0, 108, 0, 111, 0, 115, 0, 101, 0, 46, 0, 46, 0, 46, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0,
32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32
, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32,
0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0 };
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal("This marmot is getting close...", descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
public void TestUnicodeComment_ActualBytes()
{
var commentBytes = new byte[] { 85, 78, 73, 67, 79, 68, 69, 0, 84, 0, 104, 0, 105, 0, 115, 0, 32, 0, 109, 0, 97, 0, 114, 0, 109, 0, 111, 0, 116, 0, 32, 0, 105, 0, 115, 0, 32, 0, 103, 0, 101, 0, 116, 0, 116, 0, 105, 0, 110, 0, 103, 0, 32
, 0, 99, 0, 108, 0, 111, 0, 115, 0, 101, 0, 46, 0, 46, 0, 46, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0,
32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32
, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32,
0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0 };
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal("This marmot is getting close...", descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
static string?GetExposureProgramDescription(IEnumerable <Directory> directories)
{
// obtain a specific directory
var directory = directories.OfType <ExifSubIfdDirectory>().FirstOrDefault();
if (directory == null)
{
return(null);
}
// create a descriptor
var descriptor = new ExifSubIfdDescriptor(directory);
// get tag description
return(descriptor.GetExposureProgramDescription());
}
public PhotoMetadata GetMetadata(IFormFile file)
{
if (file == null)
{
throw new ArgumentException("Input file cannot be null!");
}
var metadata = new PhotoMetadata();
using (var ms = new MemoryStream())
{
file.CopyTo(ms);
ms.Seek(0, SeekOrigin.Begin);
var result = ImageMetadataReader.ReadMetadata(ms);
// obtain the Exif directories
var exifIdDirectory = result.OfType <ExifIfd0Directory>().FirstOrDefault();
var exifSubIfDirectory = result.OfType <ExifSubIfdDirectory>().FirstOrDefault();
if (exifIdDirectory != null)
{
var camera = exifIdDirectory.GetDescription(ExifIfd0Directory.TagMake) ?? "Unknown";
var model = exifIdDirectory.GetDescription(ExifIfd0Directory.TagModel) ?? "Unknown";
metadata.Camera = $"{camera} - {model}";
var takenDate = exifIdDirectory.GetDescription(ExifIfd0Directory.TagDateTime);
DateTime dateTime;
if (DateTime.TryParse(takenDate, out dateTime))
{
metadata.DateTaken = dateTime;
}
}
if (exifSubIfDirectory != null)
{
var subIfdDescriptor = new ExifSubIfdDescriptor(exifSubIfDirectory);
metadata.ExposureTime = subIfdDescriptor.GetExposureTimeDescription();
metadata.Aperture = subIfdDescriptor.GetApertureValueDescription();
metadata.Flash = subIfdDescriptor.GetFlashDescription();
metadata.Iso = subIfdDescriptor.GetIsoEquivalentDescription();
}
}
return(metadata);
}
private static void Main()
{
const string filePath = "../MetadataExtractor.Tests/Data/withIptcExifGps.jpg";
Console.WriteLine($"Processing file: {filePath}");
// There are multiple ways to get a Metadata object for a file
//
// SCENARIO 1: UNKNOWN FILE TYPE
//
// This is the most generic approach. It will transparently determine the file type and invoke the appropriate
// readers. In most cases, this is the most appropriate usage. This will handle JPEG, TIFF, GIF, BMP and RAW
// (CRW/CR2/NEF/RW2/ORF) files and extract whatever metadata is available and understood.
//
try
{
var directories = ImageMetadataReader.ReadMetadata(filePath);
Print(directories, "Using ImageMetadataReader");
}
catch (ImageProcessingException e)
{
PrintError(e);
}
catch (IOException e)
{
PrintError(e);
}
//
// SCENARIO 2: SPECIFIC FILE TYPE
//
// If you know the file to be a JPEG, you may invoke the JpegMetadataReader, rather than the generic reader
// used in approach 1. Similarly, if you knew the file to be a TIFF/RAW image you might use TiffMetadataReader,
// PngMetadataReader for PNG files, BmpMetadataReader for BMP files, or GifMetadataReader for GIF files.
//
// Using the specific reader offers a very, very slight performance improvement.
//
try
{
var directories = JpegMetadataReader.ReadMetadata(filePath);
Print(directories, "Using JpegMetadataReader");
}
catch (JpegProcessingException e)
{
PrintError(e);
}
catch (IOException e)
{
PrintError(e);
}
//
// APPROACH 3: SPECIFIC METADATA TYPE
//
// If you only wish to read a subset of the supported metadata types, you can do this by
// passing the set of readers to use.
//
// This currently only applies to JPEG file processing.
//
try
{
// Handle only Exif and IPTC from JPEG
var readers = new IJpegSegmentMetadataReader[] { new ExifReader(), new IptcReader() };
var directories = JpegMetadataReader.ReadMetadata(filePath, readers);
Print(directories, "Using JpegMetadataReader for Exif and IPTC only");
}
catch (JpegProcessingException e)
{
PrintError(e);
}
catch (IOException e)
{
PrintError(e);
}
// Write all extracted values to stdout
void Print(IEnumerable <Directory> directories, string method)
{
Console.WriteLine();
Console.WriteLine("-------------------------------------------------");
Console.Write(' '); Console.WriteLine(method);
Console.WriteLine("-------------------------------------------------");
Console.WriteLine();
// Extraction gives us potentially many directories
foreach (var directory in directories)
{
// Each directory stores values in tags
foreach (var tag in directory.Tags)
{
Console.WriteLine(tag);
}
// Each directory may also contain error messages
foreach (var error in directory.Errors)
{
Console.Error.WriteLine("ERROR: " + error);
}
}
}
DateTime?GetTakenDateTime(IEnumerable <Directory> directories)
{
// obtain the Exif SubIFD directory
var directory = directories.OfType <ExifSubIfdDirectory>().FirstOrDefault();
if (directory == null)
{
return(null);
}
// query the tag's value
if (directory.TryGetDateTime(ExifDirectoryBase.TagDateTimeOriginal, out var dateTime))
{
return(dateTime);
}
return(null);
}
string GetExposureProgramDescription(IEnumerable <Directory> directories)
{
// obtain a specific directory
var directory = directories.OfType <ExifSubIfdDirectory>().FirstOrDefault();
if (directory == null)
{
return(null);
}
// create a descriptor
var descriptor = new ExifSubIfdDescriptor(directory);
// get tag description
return(descriptor.GetExposureProgramDescription());
}
void PrintError(Exception exception) => Console.Error.WriteLine($"EXCEPTION: {exception}");
}
public void TestUserCommentDescription_ZeroLengthAscii2()
{
// fill the 10-byte encoding region
var commentBytes = Encoding.UTF8.GetBytes("ASCII\x0\x0\x0\x0\x0");
var directory = new ExifSubIfdDirectory();
directory.Set(ExifDirectoryBase.TagUserComment, commentBytes);
var descriptor = new ExifSubIfdDescriptor(directory);
Assert.Equal(string.Empty, descriptor.GetDescription(ExifDirectoryBase.TagUserComment));
}
