Class Lnk3Resource

Lnk3Resource class

Defines the class which contains information about an embedded file in the PSD format 32 bit per channel image. The link resource may contain several LiFdDataSource instances which can be accessed by indexer.

public class Lnk3Resource : Lnk2Resource

Constructors

Name	Description
Lnk3Resource()	Initializes a new instance of the `Lnk3Resource` class.

Properties

Name	Description
DataSourceCount { get; }	Gets the count of link data sources which can be accessed by the indexer.
IsEmpty { get; }	Gets a value indicating whether this link resource instance is empty.
Item { get; }	Gets the `LiFdDataSource` at the specified index. (2 indexers)
override Key { get; }	Gets the layer resource key.
override Length { get; }	Gets the PSD global link resource length in bytes.
override PsdVersion { get; }	Gets the PSD format version.
override Signature { get; }	Gets the PSD global link resource signature.

Methods

Name	Description
override Save(StreamContainer, int)	Saves the resource block data.
override ToString()	Returns a String that represents this instance.

Fields

Name	Description
const TypeToolKey	The type tool info key.

Examples

This example demonstrates how to get and set properties of the Lnk2Resource and Lnk3Resource.

[C#]

void AssertAreEqual(object expected, object actual)
{
    if (!object.Equals(actual, expected))
    {
        throw new FormatException(string.Format("Actual value {0} are not equal to expected {1}.", actual, expected));
    }
}

object[] Lnk2ResourceSupportCases = new object[]
{
new object[]
{
    "00af34a0-a90b-674d-a821-73ee508c5479",
    "rgb8_2x2.png",
    "png",
    string.Empty,
    0x53,
    0d,
    string.Empty,
    7,
    true,
    0x124L,
    0x74cL
}
};

object[] LayeredLnk2ResourceSupportCases = new object[]
{
new object[]
{
    "69ac1c0d-1b74-fd49-9c7e-34a7aa6299ef",
    "huset.jpg",
    "JPEG",
    string.Empty,
    0x9d46,
    0d,
    "xmp.did:0F94B342065B11E395B1FD506DED6B07",
    7,
    true,
    0x9E60L,
    0xc60cL
},
new object[]
{
    "5a7d1965-0eae-b24e-a82f-98c7646424c2",
    "panama-papers.jpg",
    "JPEG",
    string.Empty,
    0xF56B,
    0d,
    "xmp.did:BDE940CBF51B11E59D759CDA690663E3",
    7,
    true,
    0xF694L,
    0x10dd4L
},
};

object[] LayeredLnk3ResourceSupportCases = new object[]
{
new object[]
{
    "2fd7ba52-0221-de4c-bdc4-1210580c6caa",
    "panama-papers.jpg",
    "JPEG",
    string.Empty,
    0xF56B,
    0d,
    "xmp.did:BDE940CBF51B11E59D759CDA690663E3",
    7,
    true,
    0xF694l,
    0x10dd4L
},
new object[]
{
    "372d52eb-5825-8743-81a7-b6f32d51323d",
    "huset.jpg",
    "JPEG",
    string.Empty,
    0x9d46,
    0d,
    "xmp.did:0F94B342065B11E395B1FD506DED6B07",
    7,
    true,
    0x9E60L,
    0xc60cL
},
};

var basePath = "" + Path.DirectorySeparatorChar;
string Output = "output" + Path.DirectorySeparatorChar;

// Saves the data of a smart object in PSD file to a file.
void SaveSmartObjectData(string prefix, string fileName, byte[] data)
{
    var filePath = basePath + prefix + "_" + fileName;

    using (var container = FileStreamContainer.CreateFileStream(filePath, false))
    {
        container.Write(data);
    }
}

// Loads the new data for a smart object in PSD file.
byte[] LoadNewData(string fileName)
{
    using (var container = FileStreamContainer.OpenFileStream(basePath + fileName))
    {
        return container.ToBytes();
    }
}

// Gets and sets properties of the PSD Lnk2 / Lnk3 Resource and its liFD data sources in PSD image
void ExampleOfLnk2ResourceSupport(
    string fileName,
    int dataSourceCount,
    int length,
    int newLength,
    object[] dataSourceExpectedValues)
{
    using (PsdImage image = (PsdImage)Image.Load(basePath + fileName))
    {
        Lnk2Resource lnk2Resource = null;
        foreach (var resource in image.GlobalLayerResources)
        {
            lnk2Resource = resource as Lnk2Resource;
            if (lnk2Resource != null)
            {
                AssertAreEqual(lnk2Resource.DataSourceCount, dataSourceCount);
                AssertAreEqual(lnk2Resource.Length, length);
                AssertAreEqual(lnk2Resource.IsEmpty, false);

                for (int i = 0; i < lnk2Resource.DataSourceCount; i++)
                {
                    LiFdDataSource lifdSource = lnk2Resource[i];
                    object[] expected = (object[])dataSourceExpectedValues[i];
                    AssertAreEqual(LinkDataSourceType.liFD, lifdSource.Type);
                    AssertAreEqual(new Guid((string)expected[0]), lifdSource.UniqueId);
                    AssertAreEqual(expected[1], lifdSource.OriginalFileName);
                    AssertAreEqual(expected[2], lifdSource.FileType.TrimEnd(' '));
                    AssertAreEqual(expected[3], lifdSource.FileCreator.TrimEnd(' '));
                    AssertAreEqual(expected[4], lifdSource.Data.Length);
                    AssertAreEqual(expected[5], lifdSource.AssetModTime);
                    AssertAreEqual(expected[6], lifdSource.ChildDocId);
                    AssertAreEqual(expected[7], lifdSource.Version);
                    AssertAreEqual((bool)expected[8], lifdSource.HasFileOpenDescriptor);
                    AssertAreEqual(expected[9], lifdSource.Length);

                    if (lifdSource.HasFileOpenDescriptor)
                    {
                        AssertAreEqual(-1, lifdSource.CompId);
                        AssertAreEqual(-1, lifdSource.OriginalCompId);
                        lifdSource.CompId = int.MaxValue;
                    }

                    SaveSmartObjectData(
                        Output + fileName,
                        lifdSource.OriginalFileName,
                        lifdSource.Data);
                    lifdSource.Data = LoadNewData("new_" + lifdSource.OriginalFileName);
                    AssertAreEqual(expected[10], lifdSource.Length);

                    lifdSource.ChildDocId = Guid.NewGuid().ToString();
                    lifdSource.AssetModTime = double.MaxValue;
                    lifdSource.FileType = "test";
                    lifdSource.FileCreator = "me";
                }

                AssertAreEqual(newLength, lnk2Resource.Length);
                break;
            }
        }

        AssertAreEqual(true, lnk2Resource != null);
        if (image.BitsPerChannel < 32) // 32 bit per channel saving is not supported yet
        {
            image.Save(basePath + Output + fileName, new PsdOptions(image));
        }
    }
}

// This example demonstrates how to get and set properties of the PSD Lnk2 Resource and its liFD data sources for 8 bit per channel.
ExampleOfLnk2ResourceSupport("rgb8_2x2_embedded_png.psd", 1, 0x12C, 0x0000079c, Lnk2ResourceSupportCases);

// This example demonstrates how to get and set properties of the PSD Lnk3 Resource and its liFD data sources for 32 bit per channel.
ExampleOfLnk2ResourceSupport("Layered PSD file smart objects.psd", 2, 0x19504, 0x0001d3e0, LayeredLnk3ResourceSupportCases);

// This example demonstrates how to get and set properties of the PSD Lnk2 Resource and its liFD data sources for 16 bit per channel.
ExampleOfLnk2ResourceSupport("LayeredSmartObjects16bit.psd", 2, 0x19504, 0x0001d3e0, LayeredLnk2ResourceSupportCases);