I am trying to follow the example on:

http://msdn2.microsoft.com/en-us/library/aa480684.aspx

And have created a simple control -

1 InkPicture
1 TextBox
3 Buttons

The code for the buttons are:

private void button2_Click(object sender, EventArgs e)
{
inkPicture1.Ink.DeleteStrokes();
inkPicture1.Refresh();
}

private void button1_Click(object sender, EventArgs e)
{
byte[] inkBytes =
inkPicture1.Ink.Save(PersistenceFormat.Gif);
textBox1.Text = Convert.ToBase64String(inkBytes);
}

private void button3_Click(object sender, EventArgs e)
{
byte[] inkBytes = Convert.FromBase64String(textBox1.Text);
inkPicture1.Ink.Load(inkBytes);
inkPicture1.Invalidate();
}

So what I am trying to acheive is

1) Draw some ink on the inkpicture
2) Click on button1 and store the ink as a Base64String somewhere
(textBox1.Text)
3) Click on button2 to clear the page
4) Click on button3 to restore the ink back ot the ink control

Stage 2 seems to work - populates the textbox with a string
Stage 3 is fine - clears the picture
Stage 4 when I try to load the ink fails ("Value does not fall within
the specified range")

What am I doing wrong?

I got it -

private void button3_Click(object sender, EventArgs e)
{
byte[] inkBytes = Convert.FromBase64String(textBox1.Text);
inkPicture1.InkEnabled = false;
inkPicture1.Ink = new Microsoft.Ink.Ink();
inkPicture1.Ink.Load(inkBytes);
inkPicture1.InkEnabled = true;
inkPicture1.Invalidate();
}

Don;t worry!

Ok, now I have another problem. The control works as I would like it,
but I want to be able to interact with it using Javascript (to read
the Base64String from the inkPicture, save to a html field, and vice-
versa).

The saving from the control works fine - the string enters a textbox
on the html page. But if I try and put the data back into the control
it behaves strangely:

1) If I don't clear the ink from the control first, then no error
occurs. It seems to work normally.
2) If I clear the ink first, then I get : "Catastrophic failure
(Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED) "

To test what was going on, I added a textbox inside the control. I
then got the control to try to reload the ink from this textbox. Once
I had the Base64String in the html textbox, I pasted it into the new
control based textbox, and everything worked fine. Could there be
some problem with Javascript which is not loading the data back
correctly?



Anyway, my code is:

public string Value
{
get
{return (GetBase64ISF()); }
set

{
try
{
byte[] inkBytes = Convert.FromBase64String(Value);
inkPicture1.InkEnabled = false;
inkPicture1.Ink = new Microsoft.Ink.Ink();
inkPicture1.Ink.Load(inkBytes);
inkPicture1.InkEnabled = true;
inkPicture1.Invalidate();
}
catch (Exception e)
{ TextBox1.Text = e.Message + "\r\n" ; };
}
}

private string GetBase64ISF()
{
byte[] inkBytes =
inkPicture1.Ink.Save(PersistenceFormat.Gif);
return Convert.ToBase64String(inkBytes);
}

public void clear()
{
inkPicture1.Ink.DeleteStrokes();
inkPicture1.Refresh();
}



and the html / javascript is:

<script>
function getValue()
{document.frmCheckMe.elements["thetext"].value =
document.frmCheckMe.elements["PICTURE"].value;}

function setValue()
{document.frmCheckMe.elements["PICTURE"].value =
document.frmCheckMe.elements["thetext"].value;}
</script>

<form name='frmCheckMe' id='frmCheckMe'>
<object id='PICTURE' name='PICTURE'
classid="PC1.dll#PC1.UserControl1">
</object>

<input type="button" value="Save" onClick="getValue();"/>
<input type="button" value="Load" onClick="setValue();"/>
<input type="button" value="Wipe"
onClick="document.frmCheckMe.elements["PICTURE"].clear();"/>
<textarea style='width:835px;font-size:18px;' id = 'thetext'
name='thetext' cols='70'></textarea>
</form>

You need to construct a new Ink object. You can't load ink into an ink
object that has been populated before.

Ink newInk = new Ink();
newInk.Load(...);
inkPicture.Ink = newInk;

Josh

<njhartley******.com> wrote in message
news:1174497182.309749.159490@e1g2000hsg.googlegro ups.com...
>
> I am trying to follow the example on:
>
> http://msdn2.microsoft.com/en-us/library/aa480684.aspx
>
> And have created a simple control -
>
> 1 InkPicture
> 1 TextBox
> 3 Buttons
>
> The code for the buttons are:
>
> private void button2_Click(object sender, EventArgs e)
> {
> inkPicture1.Ink.DeleteStrokes();
> inkPicture1.Refresh();
> }
>
> private void button1_Click(object sender, EventArgs e)
> {
> byte[] inkBytes =
> inkPicture1.Ink.Save(PersistenceFormat.Gif);
> textBox1.Text = Convert.ToBase64String(inkBytes);
> }
>
> private void button3_Click(object sender, EventArgs e)
> {
> byte[] inkBytes = Convert.FromBase64String(textBox1.Text);
> inkPicture1.Ink.Load(inkBytes);
> inkPicture1.Invalidate();
> }
>
> So what I am trying to acheive is
>
> 1) Draw some ink on the inkpicture
> 2) Click on button1 and store the ink as a Base64String somewhere
> (textBox1.Text)
> 3) Click on button2 to clear the page
> 4) Click on button3 to restore the ink back ot the ink control
>
> Stage 2 seems to work - populates the textbox with a string
> Stage 3 is fine - clears the picture
> Stage 4 when I try to load the ink fails ("Value does not fall within
> the specified range")
>
> What am I doing wrong?
>