// This function will load ISF into the ink object.
// It will also pull the data stored in the object's extended properties and
// repopulate the text boxes.
private void LoadISF(Stream s)
{
Microsoft.Ink.Ink loadedInk = new Microsoft.Ink.Ink();
byte[] isfBytes = new byte[s.Length];
// read in the ISF
s.Read(isfBytes, 0, (int)s.Length);
// load the ink into a new ink object
// once an ink object has been "dirtied" it can never load ink again
loadedInk.Load(isfBytes);
// temporarily disable the ink collector and swap ink objects
// We checked the InkCollector.CollectingInk property to verify
// the user has stopped inking. Otherwise, Enabled will throw
// InvalidOperationException.
ic.Enabled = false;
ic.Ink = loadedInk;
ic.Enabled = true;
// Repaint the inkable region
Signature.Invalidate();
ExtendedProperties inkProperties = ic.Ink.ExtendedProperties;
// Get the raw data out of this stroke's extended
// properties list, using our previously defined
// Guid as a key to the extended property we want.
// Since the save method stored the first and last
// name information as extended properties, we can
// remove this information now that the load is complete.
if (inkProperties.DoesPropertyExist(FirstName))
{
FirstNameBox.Text = (String)inkProperties[FirstName].Data;
inkProperties.Remove(FirstName);
}
else
{
FirstNameBox.Text = String.Empty;
}
if (inkProperties.DoesPropertyExist(LastName))
{
LastNameBox.Text = (String)inkProperties[LastName].Data;
inkProperties.Remove(LastName);
}
else
{
LastNameBox.Text = String.Empty;
}
}
// This function saves the form in ISF format.
// It uses ExtendedProperties to preserve the first and last names.
// ExtendedProperties are an easy way to store non-ink data within an
// ink object. In this case, there is no outer format which contains the
// ink, so the only place to store the names is within the ink object itself.
private void SaveISF(Stream s)
{
byte[] isf;
// This is the ink object which will be serialized
ExtendedProperties inkProperties = ic.Ink.ExtendedProperties;
// Store the name fields in the ink object
// These fields will roundtrip through the ISF format
// Ignore empty fields since strictly empty strings
// cannot be stored in ExtendedProperties.
if (FirstNameBox.Text.Length > 0)
{
inkProperties.Add(FirstName, FirstNameBox.Text);
}
if (LastNameBox.Text.Length > 0)
{
inkProperties.Add(LastName, LastNameBox.Text);
}
// Perform the serialization
isf = ic.Ink.Save(PersistenceFormat.InkSerializedFormat);
// If the first and last names were added as extended
// properties to the ink, remove them - these properties
// are only used for the save and there is no need to
// keep them around on the ink object.
if (inkProperties.DoesPropertyExist(FirstName))
{
inkProperties.Remove(FirstName);
}
if (inkProperties.DoesPropertyExist(LastName))
{
inkProperties.Remove(LastName);
}
// Write the ISF to the stream
s.Write(isf, 0, isf.Length);
}