Error Restoring Signature (Hexadecimal format)

[den 2005]

Hi everybody,
I am problem with restoring data of byte[] type to be loaded on an Ink
object. The data
was earlier converted to byte[] then finally to hexadecimal data and store
on a text file.
Is there anyone who can help me solve this problem. Thanks.

Note: The Ink object is from Microsoft.Ink namespace.

Code:

private void LoadXML()
{
try
{
// This object will encode our byte data to a UTF8 string
UTF8Encoding utf8 = new UTF8Encoding();

Ink loadedInk = new Ink();

string filePath = Application.Sta rtupPath + "\\siganture.tx t" +

StreamReader sreader = new StreamReader(fi lePath);

string Signature = sreader.ReadToE nd();

// load the ink into a new ink object
// once an ink object has been "dirtied" it can never load ink again

loadedInk.Load( utf8.GetBytes(s trSignature)); <- Error Occurs here
// temporarily disable the ink collector and swap ink objects
ic.Enabled = false;
ic.Ink = loadedInk;
ic.Enabled = true;

// Repaint the inkable region

this.pictureBox .Invalidate();
}
catch (Exception ex)
{
//error handling processes
}
}

Error Message:

"System.Runtime .InteropService s.COMException (0x8000FFFF): Catastrophic
failure\r\n at Microsoft.Ink.I nkDispClass.Loa d(Object Data)\r\n at
Microsoft.Ink.I nk.Load(Byte[] inkdata)\r\n at SignatureForm.L oadSiganture()
in c:\\....\\signa tureform.cs:lin e 2163\r\n at
signatureForm.b tnCancel_Click( Object sender, EventArgs e) in
c:\\...\\signat ureform.cs:line 705\r\n at
System.Windows. Forms.Control.O nClick(EventArg s e)\r\n at
System.Windows. Forms.Button.On Click(EventArgs e)\r\n at
System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)\r\n at
System.Windows. Forms.Control.W mMouseUp(Messag e& m, MouseButtons button,
Int32 clicks)\r\n at System.Windows. Forms.Control.W ndProc(Message& m)\r\n
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)\r\n at
System.Windows. Forms.Button.Wn dProc(Message& m)\r\n at
System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)\r\n
at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)\r\n at
System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)\r\n at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)\r\n at
System.Windows. Forms.Component Manager.System. Windows.Forms.U nsafeNativeMeth ods+IMsoCompone ntManager.FPush MessageLoop(Int 32
dwComponentID, Int32 reason, Int32 pvLoopData)\r\n at
System.Windows. Forms.ThreadCon text.RunMessage LoopInner(Int32 reason,
ApplicationCont ext context)\r\n at
System.Windows. Forms.ThreadCon text.RunMessage Loop(Int32 reason,
ApplicationCont ext context)\r\n at
System.Windows. Forms.Applicati on.Run(Form mainForm)\r\n at MainForm.Main()
in c:\\....\\mainf orm.cs:line 557"

den2005
--
MCP Year 2005, Philippines

[Jon Skeet [C# MVP]]

den 2005 <de*****@discus sions.microsoft .com> wrote:

Hi everybody,
I am problem with restoring data of byte[] type to be loaded on an Ink
object. The data
was earlier converted to byte[] then finally to hexadecimal data and store
on a text file.
Is there anyone who can help me solve this problem. Thanks.

Okay, your problem has nothing to do with ink. It's just converting
between text data and binary data.

You've got binary data which has been hex-encoded. So to get back to
the binary data, you need to *decode* it from hex - currently you're
just getting the string encoded in UTF-8. See
http://www.pobox.com/~skeet/csharp/unicode.html for information about
encodings to understand what's going on.

Now, there's nothing built into the framework (as far as I know) to
decode a whole hex string. If you can change the format of the file, it
would be easier to use Base64 - then you can use Convert.ToBase6 4String
and Convert.FromBas e64String.

Otherwise, just loop through pairs of characters, converting each to a
byte. I'm sure I had some code somewhere on a newsgroup to do this, but
I can't find it right now...

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too