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Hi all.
I have found a really weird problem, and have given up trying to find how to answer this. MSDN and the windows forms programming book just don't explain this:
I have build a type converter that implements saving complex types through the InstanceDescriptor.
The class works without a problem generating code for the design mode until you run the program. Once run, the type converter is broken. It cannot convert and I get that darned stupid cryptic message "cannot convert [type a] to [type a]"
does anyone have any thoughts or suggestions on what is happening here?
Thanks,
Tom
-- modified at 21:54 Sunday 25th February, 2007
I messed around with a quick post i saw and found out that using casting in the type converters may cause crashes. I removed all of the casting and am now pulling the values from the object.
I also seem to be having trouble if i inherit from typeconverter, but have no problems from expandableobjectconverter
It works, but I'm really uncomfortable not being able to check a type prior to using it in the program. (granted it's only at design time) but still, I want to be able to do this.
Thanks.
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Is it possible within vb.net2005 to specify where a messagebox will be placed on screen, e.g. x=, 7= ???
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By default, a MessageBox is displayed in the center of the screen, and you can't change it's location. But, you could always create your own MessageBox via a Windows Form.
Trinity: Neo... nobody has ever done this before.
Neo: That's why it's going to work.
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I have a subroutine that creates new pictureboxes when a user clicks a button. Here is a condensed version:
ReDim Preserve Picbox(array_size)
For index As Integer = 0 To array_size
Picbox(index) = New PictureBox
Next
For index As Integer = 0 To array_size
Me.Controls.Add(Picbox(index))
Picbox(index).Image = blip
Next
Now, I need to know how to be able to remove a picturebox, or otherwise manipulate the new pictureboxes. When I modify/erase pictures in the array, nothing happens to the pictureboxes on the form. How can I manipulate these new pictureboxes?
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If you want to remove a specific picturebox according to your code, use dispose method as shown below.
Picbox(index).dispose
I think that should work! 
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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That does not work. The pictureboxes remain on the form.
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Try Me.Controls.remove(Picturebox name goes here)...
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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i have 1 labels, 1 text box and one check box
suppose label contains name,
in textbox user have to enter its age
and checkbox is checkd if he is married.
i have given conneection string using oledb in access sheet
and its storing the values of label, textbox and checkbox succesfully
but nw i have problem when i have many number of labels , correspondin textboxes and checkboxes.
when i enter all the values i want them to get store on one button click in my acccess sheet.
m uanble to implement any logic.
can smbody help..
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You can iterate over your controls collection and find these different controls. Otherwise, you need to write the code to deal with them, one by one.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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i think both not gonna work...
if i go for iteration
then i need to run the loops , i also thought abt same logic
but while writing into connection string u cant write label'i'.
it has to be no. only.
and i cant deal them individually
suppose i have to store for 200 hundred people..
i cant write code for individual case....
its nt feasable man....
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There are no other options, sorry. How does a control Id go into a connection string ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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common man there mst be some logic...
any other logic u suggest..
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You're right. There's a way to do this, and I'm keeping it a secret from you.
OR, if you have 200 labels and you want to data bind them, then you need to write the code to do it yourself, or come up with a solution that involves iterating over the controls collection. If you answered my question, I may be able to help more. How is a connection string going to take a control Id ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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If I understand what you're doing, you should not be using a bunch of labels, textboxs, and checkbox's. Your approach requires you to write lots more code than is necessary. This problem is more appropriately handled by a bound DataGridView.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi Again,
How do I get it so that when the caret is on a normal line the formatting buttons are false, if I place it on a bold piece of text the Bold button is true etc like word does?
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What control are you using ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Sorry, always forget to mention that 
VB2005 Express Edition
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No, what control are you using, that shows bold text and has a caret. Is it the rich text box ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Yes it's a RTB
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Here is one possible idea. What I did was stored the selection font of the richtextbox. In the selectionchanged event I compared the selectionfont with the last font. If they are different you could update your controls to reflect the new font. The same concept could be applied to color as well.
Dim lastFont As Font = Nothing
Private Sub RichTextBox1_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles RichTextBox1.SelectionChanged
If (lastFont Is Nothing) OrElse (Not lastFont.Equals(RichTextBox1.SelectionFont)) Then
'The font is different so reflect changes
'Update lastFont to current font
lastFont = RichTextBox1.SelectionFont
'Testing purposes
Console.WriteLine(RichTextBox1.SelectionFont.ToString)
End If
End Sub
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Thanks TF
Will have a go at this tomorrow and let you know how I get on.
BTW
Love that Console.Writeline idea, meant to say last time, it doesn't half go a long way to solving problems.
Cheers
Graham
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TF, I like the way that works but it's not quite what I'm after.
What I am trying for is, if I have two lines of text, the first is Bold/Italic the second is Regular.
If I place the caret on Line 1 then the Bold and Italic Toolbar items are Selected(True), if I then place it on Line 2 the Bold and Italic Toolbar items are Deselected(False)
Basically where ever the caret is it will tell me what fontstyle it is on by switching on or off the highlighting on the fontstyle buttons on the Toolbar.
I think this may be a tall order but it would be great if it can be done.
Thanks
Graham
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Not that tall of an order I am 99.99% sure I know what your after and the start I gave you will get you there. What I did was looked for a change in the selectionfont (aka. Where the caret is). If the caret goes from bold text to regular text the if statement will evaluate to true and the code inside will execute. All you need to do is look at the current font and update your controls as needed. Here is an example using your programs code
Dim m_LastFont As Font = Nothing
Private Sub rtbText_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles rtbText.SelectionChanged
'Has font changed since last position?
If m_LastFont Is Nothing OrElse Not m_LastFont.Equals(rtbText.SelectionFont) Then
'Yes. Update GUI to reflect it
'Set last font to new font
m_LastFont = rtbText.SelectionFont
'If Bold button doesn't reflect current state change it
If tlbBold.Checked <> m_LastFont.Bold Then
tlbBold.Checked = m_LastFont.Bold
Bold = m_LastFont.Bold
End If
'If Italic button doesn't reflect current state change it
If tlbItalic.Checked <> m_LastFont.Italic Then
tlbItalic.Checked = m_LastFont.Italic
Italic = m_LastFont.Italic
End If
End If
End Sub
The font object has everything you need to know, except color, but the same principles can be applied there as well. I hope that clears things up. Assuming I understand what you want, which I think I do, this is your solution. Or at least the only one I could come up with
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TF,
This is so close it's frustrating!
It works as you would expect, you place the caret over a section of Bold text and the tlbBold button Lights up, place it over Underline text and tlbBold is deselected and tlbUnderline is selected.
Sorted! Well not quite.
So what's not working? well try selecting some text, click one of the Fontstyle buttons, then move to another section of regular text and the Fontstyle is still selected.
Any Ideas?
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Nice find I hadn't noticed that bug. The problem was when the font style was changed by the user m_LastFont never got updated. So if you then move the caret to a location that matches the original text you changed, the code thinks the new locations font style still matches the last location. The simple fix is update m_LastFont in your 'style' method to reflect the selectionfont. I just added the code 'm_LastFont = rtbText.SelectionFont' to the very end of the method and it seems to have fixed that bug. Hopefully there are no more surprises.
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