Visual Basic

Re: Deleting/Clearing programmically created controls

28-Dec-05 13:14

It sounds as though you shouldn't be creating and deleting the panels. Rather just altering what they're displaying. Creating and killing controls at runtime is a very expensive operation.

Just keep track of the Panels in your own array and modify their properties. Instead of killing the panel, couldn't you just set it's Visible property to False?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Hmmkk28-Dec-05 14:58

Hmmkk

28-Dec-05 14:58

Well yeah I have thought about taking it to a more "stationary system"... but I don't really want to mess up the layout(in the designer), everthing will become stacked and impossible to find, that was one of the reason to do it at runtime.
Also as I said... it's about sequences and just using a timer to flash a panel at a time, but with this is also 3 different difficulties, which contains of more and more panels, at most 5 x 6 panels. That would be like 30 * 30 loops == 900 loops, which might not be very efficient no=/ But if I go for the stationary with allready placed panels... I guess I would have a limited amount of panels to handle and therefore could handle them all in one single handler. But isn't there away to handle all those created controls? ( I guess there is one for ALL controls, but I do have buttons and radio buttons that need special treatment, so what about a range of controls?)
Thanks alot for help so far.

Regards,
Hmmkk

Re: Deleting/Clearing programmically created controls

Dave Kreskowiak28-Dec-05 16:06

still excel remains in memory

28-Dec-05 16:06

Like I said, you'll have to track them yourself in your own collections. They'll also have to be added to the Form's Controls collection so you can actually see them.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

HowTo: HTML_2_Image

Dredy28-Dec-05 0:58

Dredy

28-Dec-05 0:58

Hi folks,

I need (a Tool or a Hint) to convert programmatically a webpage (URL) to a thumbnail,
even using Internet Explorer as a parsing unit.

There's many tools over the Internet, but i figure out that it can be possible
using the GDI+ API's in the .net Framework.

Nobody knows how to perform this task?

Thanks i.a. to all that read this topic.

Ennio Della Lucia
Italy

jith - iii27-Dec-05 22:54

jith - iii

27-Dec-05 22:54

This is done in VB6.0

I have closed the application, the workbook and quited the excel application but the excel is still in memory.
Actually i have some macros in my excel .It might be creating the problem,i guess now.

and from one site i have seen that i have to ensure whether the excel has been saved or not (I am giving book.save in the code)

for that i did

while (not workbook1.Saved)

DoEvents
wend

But it didnt work...then,
I closed each and every workbooks by putting it in a loop.

But still excel remains in memory .I could open only if i have closed the excel.exe from the taskbar.Please help...
Thanks

How to communicate with serial port in VB.NET

kusikue27-Dec-05 22:46

kusikue

27-Dec-05 22:46

can anybody tell me how i can communicate with the hardware through serial port in VB.NET.

Kusum

Re: How to communicate with serial port in VB.NET

Dave Kreskowiak28-Dec-05 4:34

Re: How to communicate with serial port in VB.NET

28-Dec-05 4:34

What you send over the serial port will be VERY device specific.

How you send it will depend on the version of the .NET Framework you're using.

For .NET 1.0 and 1.1, you'll have to find a 3rd party Serial Port library (unless you want to write your own). I suggest searching GotDotNet.com for "serial port" to find one.

For .NET 2.0, you can use the SerialPort[^] class.

I don't have any examples for either of them. You'll have to do some Googling yourself.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

WillemM28-Dec-05 8:55

WillemM

28-Dec-05 8:55

I made an article on the subject. http://www.codeproject.com/vb/net/Comport_made_simple.asp[^]

Hope that helps.

WM.

What about weapons of mass-construction?

Get previously active window??

matsnas27-Dec-05 22:29

matsnas

27-Dec-05 22:29

Hi!

Trying to get the handle of the window (actual app, not textbox or other window) that was active before I clicked in my own win form? I've tried GetActiveWindow and GetWindow with the GW_HWNDNEXT and GW_HWNDPREV paremeters but I'm no expert using Windows API's and can't seem to get it to work:

'Get the next window handle.
Dim vWndActive As IntPtr = GetActiveWindow
Dim vWndPrev As IntPtr = GetWindow(vWndActive, GW_HWNDPREV) 'this line doesn't work!!

'Activate previously active window
Dim vClassName As String = Space(256)
GetWindowText(vWndPrev, vClassName, vClassName.Length)
AppActivate(vClassName)

I know this code doesn't work and may not make much sense but it's the stripped version of what I'm trying to do and I think you get the point.

(Ps. Using vb.net)

Re: Get previously active window??

Dave Kreskowiak28-Dec-05 4:46

28-Dec-05 4:46

There is no function that will return the previously active window. AFAIK, the only reliable way would be to override your window's WndProc and look for the WM_ACTIVATE message. If the low order word of the wParam field of this message contains the WA_ACTIVE or WA_CLICKACTIVE message, the lParam of the message will contain the handle to the window that lost the focus.

Once this message is processed by your application, it's way too late to call any function to find out what the previous window was.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

WinForm LifeCycle..

HakunaMatada27-Dec-05 19:52

HakunaMatada

27-Dec-05 19:52

What are the list of events that get fired during the life cycle of a Win Form in .NET, I mean when it is created and destroyed.

---
With best regards,
A Manchester United Fan

The Genius of a true fool is that he can mess up a foolproof plan!

Dave Kreskowiak28-Dec-05 4:37

28-Dec-05 4:37

After a quick search on MSDN for "forms order of events", click[^].

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

HakunaMatada28-Dec-05 17:24

HakunaMatada

28-Dec-05 17:24

Thats for Visual Studio 2005. Is it the same for Winforms in Visual Studio 2003? Smile | :)

---
With best regards,
A Manchester United Fan

The Genius of a true fool is that he can mess up a foolproof plan!

Dave Kreskowiak29-Dec-05 5:18

29-Dec-05 5:18

No, that's for Windows Forms in .NET. VB.NET 2005 added the little note in the middle of the page, but the order of events has not changed in the Form class since .NET 1.0 was released.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

DataGridTextBoxColumn can hold the ComboBox ??

HakunaMatada29-Dec-05 17:11

HakunaMatada

29-Dec-05 17:11

Thanks...

---
With best regards,
A Manchester United Fan

The Genius of a true fool is that he can mess up a foolproof plan!

HemaRawat27-Dec-05 19:17

HemaRawat

27-Dec-05 19:17

Hey
I want to add a column in winforms datagrid
That will show the combo box with multi columns.
How we can create Multi Column Combo Box & embed that with datagrid

Is DataGrid's DataTextBoxColumn can hold the MultiCOlumnComboBox Control???????

Any Source Code,suggestion,link,guidence is highly appreciated

Thanks a bunch in advance.

Hema Chaudhry

Robert Rohde27-Dec-05 21:21

Robert Rohde

27-Dec-05 21:21

Hi,

there are many articles[^] here on CodeProject showing how to do this.

HemaRawat27-Dec-05 22:18

HemaRawat

27-Dec-05 22:18

Hey,

Thanks for the Prompt & precise reply.
But these all articles I have senn they are implementing the Single Column
Combo Box . WhichI have done already.

My problem is to embed the MultiCOlumn ComboBox inside datagrid

I have seen some multi Column Combobox User Controls Examples also
on CodeProject.com iteself.

But they all are not fully embedded with the wnforms datagrid.

your valuable suggestion are highly appreciated.

thanks a lot

Hema Chaudhry

Robert Rohde27-Dec-05 22:30

Robert Rohde

27-Dec-05 22:30

You will probably will have to make this yourself. I would suggest you look into one the the articles showing how to add a normal combobox into the grid and try to exchange the combobox with one of the multicolumn comboboxes[^] already available.