/// <summary>
/// Handle exception from docManager_SaveEvent function
/// </summary>
/// <param name="ex"></param>
/// <param name="fileName"></param>
private void HandleSaveException(Exception ex, SerializationEventArgs e)
{
MessageBox.Show(this,
"Save File operation failed. File name: " + e.FileName + "\n" +
"Reason: " + ex.Message,
Application.ProductName);
e.Error = true;
}
/// <summary>
/// Save document to stream supplied by DocManager
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void docManager_SaveEvent(object sender, SerializationEventArgs e)
{
// DocManager asks to save document to supplied stream
try
{
e.Formatter.Serialize(e.SerializationStream, drawArea.GraphicsList);
}
catch (ArgumentNullException ex)
{
HandleSaveException(ex, e);
}
catch (SerializationException ex)
{
HandleSaveException(ex, e);
}
catch (SecurityException ex)
{
HandleSaveException(ex, e);
}
}
/// <summary>
/// Save file.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public bool SaveDocument(SaveType type)
{
// Get the file name
string newFileName = this.fileName;
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.Filter = fileDlgFilter;
if ((type == SaveType.SaveAs) ||
Empty(newFileName))
{
if (!Empty(newFileName))
{
saveFileDialog1.InitialDirectory = Path.GetDirectoryName(newFileName);
saveFileDialog1.FileName = Path.GetFileName(newFileName);
}
else
{
saveFileDialog1.InitialDirectory = fileDlgInitDir;
saveFileDialog1.FileName = newDocName;
}
DialogResult res = saveFileDialog1.ShowDialog(frmOwner);
if (res != DialogResult.OK)
return false;
newFileName = saveFileDialog1.FileName;
fileDlgInitDir = new FileInfo(newFileName).DirectoryName;
}
// Write the data
try
{
using (Stream stream = new FileStream(
newFileName, FileMode.Create, FileAccess.Write))
{
// Serialize object to text format
IFormatter formatter = new BinaryFormatter();
if (SaveEvent != null) // if caller subscribed to this event
{
SerializationEventArgs args = new SerializationEventArgs(
formatter, stream, newFileName);
// raise event
SaveEvent(this, args);
if (args.Error)
return false;
}
}
}
catch (ArgumentNullException ex) { return HandleSaveException(ex, newFileName); }
catch (ArgumentOutOfRangeException ex) { return HandleSaveException(ex, newFileName); }
catch (ArgumentException ex) { return HandleSaveException(ex, newFileName); }
catch (SecurityException ex) { return HandleSaveException(ex, newFileName); }
catch (FileNotFoundException ex) { return HandleSaveException(ex, newFileName); }
catch (DirectoryNotFoundException ex) { return HandleSaveException(ex, newFileName); }
catch (PathTooLongException ex) { return HandleSaveException(ex, newFileName); }
catch (IOException ex) { return HandleSaveException(ex, newFileName); }
// Clear the dirty bit, cache the new file name
// and the caption is set automatically
Dirty = false;
SetFileName(newFileName);
// Success
return true;
}
/// <summary>
/// Load document from the stream supplied by DocManager
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void docManager_LoadEvent(object sender, SerializationEventArgs e)
{
// DocManager asks to load document from supplied stream
try
{
drawArea.GraphicsList = (GraphicsList)e.Formatter.Deserialize(e.SerializationStream);
}
catch (ArgumentNullException ex)
{
HandleLoadException(ex, e);
}
catch (SerializationException ex)
{
HandleLoadException(ex, e);
}
catch (SecurityException ex)
{
HandleLoadException(ex, e);
}
}
/// <summary>
/// Open document
/// </summary>
/// <param name="newFileName">
/// Document file name. Empty - function shows Open File dialog.
/// </param>
/// <returns></returns>
public bool OpenDocument(string newFileName)
{
// Check if we can close current file
if (!CloseDocument())
return false;
// Get the file to open
if (Empty(newFileName))
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = fileDlgFilter;
openFileDialog1.InitialDirectory = fileDlgInitDir;
DialogResult res = openFileDialog1.ShowDialog(frmOwner);
if (res != DialogResult.OK)
return false;
newFileName = openFileDialog1.FileName;
fileDlgInitDir = new FileInfo(newFileName).DirectoryName;
}
// Read the data
try
{
using (Stream stream = new FileStream(
newFileName, FileMode.Open, FileAccess.Read))
{
// Deserialize object from text format
IFormatter formatter = new BinaryFormatter();
if (LoadEvent != null) // if caller subscribed to this event
{
SerializationEventArgs args = new SerializationEventArgs(
formatter, stream, newFileName);
// raise event to load document from file
LoadEvent(this, args);
if (args.Error)
{
// report failure
if (OpenEvent != null)
{
OpenEvent(this,
new OpenFileEventArgs(newFileName, false));
}
return false;
}
// raise event to show document in the window
if (DocChangedEvent != null)
{
DocChangedEvent(this, new EventArgs());
}
}
}
}
// Catch all exceptions which may be raised from this code.
// Caller is responsible to handle all other exceptions
// in the functions invoked by LoadEvent and DocChangedEvent.
catch (ArgumentNullException ex) { return HandleOpenException(ex, newFileName); }
catch (ArgumentOutOfRangeException ex) { return HandleOpenException(ex, newFileName); }
catch (ArgumentException ex) { return HandleOpenException(ex, newFileName); }
catch (SecurityException ex) { return HandleOpenException(ex, newFileName); }
catch (FileNotFoundException ex) { return HandleOpenException(ex, newFileName); }
catch (DirectoryNotFoundException ex) { return HandleOpenException(ex, newFileName); }
catch (PathTooLongException ex) { return HandleOpenException(ex, newFileName); }
catch (IOException ex) { return HandleOpenException(ex, newFileName); }
// Clear dirty bit, cache the file name and set the caption
Dirty = false;
SetFileName(newFileName);
if (OpenEvent != null)
{
// report success
OpenEvent(this, new OpenFileEventArgs(newFileName, true));
}
// Success
return true;
}