Re: Component Class Problem - C# Discussion Boards

Re: Need for a Grid in C#

22-Aug-02 8:14

Read my post again Luis. I have never said a datagrid must be attached to a IDataSet,

And I swallow a small raisin.

Luis Alonso Ramos22-Aug-02 8:30

Luis Alonso Ramos

22-Aug-02 8:30

I had that idea from the docs... I briefly tried using it the other day and it caused exceptions when I modified the data (I think, I don't quite well remember)

-- LuisR

──────────────
  Luis Alonso Ramos
  Chihuahua, Mexico
  www.luisalonsoramos.com

"Do not worry about your difficulties in mathematics, I assure you that mine are greater." -- Albert Einstein

Control, or UserControl?

Nnamdi Onyeyiri22-Aug-02 3:24

Re: Control, or UserControl?

22-Aug-02 3:24

i was looking through the new file dialog on vs.net, and noticed a userconol class, so i onpened one, and found the base class was userControl, so i was wondering what the difference was, and if it was best to derive from Control or userControl.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

leppie22-Aug-02 3:46

Re: Control, or UserControl?

22-Aug-02 3:46

I think usercontrol provides extra designer support and acts like a form really (without borders), but i could be wrong...

From MSDN:
By extending ContainerControl, UserControl inherits all the standard positioning and mnemonic-handling code that is necessary in a user control.

AND...I was meant to say Form also extends ContainerControl. Thus the similarity Smile | :)

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

James T. Johnson22-Aug-02 6:24

James T. Johnson

22-Aug-02 6:24

Typically you use Control for controls made from scratch and you use UserControl to create composite controls (a control that contains other controls).

James
"And we are all men; apart from the females." - Colin Davies

Component Class Problem

Chris Richner22-Aug-02 1:28

Chris Richner

22-Aug-02 1:28

Hi NG,
I've got a Class derived from component.

[Browsable(true)]
public Form Parent
{
get
set
{
this.parent = value;
this.parent.Load += new EventHandler(......
}
}

the desinger generates now this code if i drag my component on a form

void InitalizeComponents()

{<br />
mYCom = new MyComp();<br />
mYCom.Parent = this;<br />
}

Now the designer does not show any form derived from this form, the error is "Object is ....", there's only a white blank page.

Now if i remove the add eventhandler code in my set property, everything works fine.

How do i have to code this, i would like to set the parent of the component, attach a event.

.:Greets from Jerry Maguire:.

Re: Component Class Problem

James T. Johnson22-Aug-02 6:23

James T. Johnson

22-Aug-02 6:23

Try wrapping the addition of the event handler with a check to see if you are in design mode.

if( !DesignMode )<br />
  this.parent.Load += new EventHandler(......);

James
"And we are all men; apart from the females." - Colin Davies

Re: Component Class Problem

Chris Richner25-Aug-02 22:15

Chris Richner

25-Aug-02 22:15

The Problem is that this property is set while the Form is in InitializeComponent Method, now the Flag DesignMode is always false. It seems to be to early for this flag, i guess this flag is set after this Method is passed, in Form.Load Event we can use this flag.

.:Greets from Jerry Maguire:.

help me

imran_rafique22-Aug-02 0:26

imran_rafique

22-Aug-02 0:26

if i have hwndle (Intptr)of parent window and hwndle of child window then how to get the point and rectangle of child window with respect to its parent window ?

how to convert HWND into intptr?

r00d0034@yahoo.com

Re: help me

Stephane Rodriguez.22-Aug-02 1:43

22-Aug-02 1:43

Question 1 :

In C++, that was,

POINT pt;
::ClientToScreen(hwndchild,pt);
::ScreenToClient(hwndparent,pt);

In C# it is,

Point pt;
Control.FromHandle(hWndchild).PointToScreen(pt);
Control.FromHandle(hWndparent).ScreenToClient(pt);

Question 2 : IntPtr hWnd = (IntPtr) h; // where h is a HWND

And I swallow a small raisin.

Re: help me

imran_rafique22-Aug-02 9:16

imran_rafique

22-Aug-02 9:16

thanks for your help
i have one more problem and that is
please read that code and solve mine problem

tmpProcess = new Process();
tmpProcess.WaitForInputIdle();
tmpProcess.StartInfo.FileName="f:\\mirc59t";
try{
tmpProcess.Start();
while(! tmpProcess.Responding)System.Windows.Forms.Application.DoEvents();
}catch{}

tmpProcess.WaitForInputIdle();
IntPtr hWnd=tmpProcess.MainWindowHandle;
///////////////////////////////////////////////////////////
Control parent = Control.FromHandle(hWnd);
//////////////////////////////////////////////////////////
//Control parent = Control.FromChildHandle(hWnd);
if(parent!=null)
MessageBox.Show("parant not null");

/*foreach(Control child in parent.Controls)
{
IntPtr childHandle = child.Handle;

}*/
///////////////////////////////////////////////////////////
parent variable recive null that's why remaining code could not run.

it should not recive null because the process main window
contain two button and four Static members.

can any body tell why it recive null?
and what i have to do that it should not recive null?
i will be very thank full to u.

r00d0034@yahoo.com

Re: help me

Stephane Rodriguez.22-Aug-02 10:19

Invoking Edit Label in ListView from Code

22-Aug-02 10:19

Looks obvious to me, you are starting a process and assume that you get the handle of the main window of the attached process, first error, and then you assume you can get your hands on the main Form instance of a process, second error.

First error : do not assume a process has a window attached it. A process is anything like a .exe, and does not necessarily have a window attached. You must do something like if (!hWnd.Equals(IntPtr.zero)) { ... }

Second error : window handles can be manipulated by any process running on the OS, there is no security problem here because a window handle is nothing. But the instance of the control attached to it is something which lives in the address space of the process, something you don't have your hands on. You have to do some form of messaging (such like the typical WIN32 ::SendMessage, or the more .Net-like Windows.Messaging) to get it between your process, and the one you have started.

And I swallow a small raisin.

Rüpel21-Aug-02 22:20

Rüpel

21-Aug-02 22:20

hi there,

subject says it all. i have a listview with LabelEdit set to True - so clicking a label when it is already selected lets the user edit the label's text within the listview.

now i want to start the labeledit-thing by a key (F2) - so i wrote a KeyUp-handler, made the usual switch (e.KeyCode) and now i'm stuck. how should i tell the listview that the user wants to edit the currently selected label? maybe i raise a BeginLabelEdit-event by hand, but how is that done? other ideas?

Confused | :confused:

thx in advance. Rose | [Rose]

:wq

i can'T move my form...

Atilla Selem21-Aug-02 21:05

Atilla Selem

21-Aug-02 21:05

i have a form app and i put a background image on my form. then set the TransparencyKey to white and select 'None' for FormBorderStyle in order to see a transparent view when app starts.
Everything seems Ok, But my problem is that i can't move my transparent form anywhere. What should i do to move my form without a border?

Any help will be appreciated...
Thanks,

Atilla Selem

just listening to you...

Stephane Rodriguez.21-Aug-02 21:30

21-Aug-02 21:30

I am afraid you have to provide the same feature than the one from a standard full-fledged windows app : in the system menu in the caption, there is a "move" command for this purpose,

And I swallow a small raisin.

leppie21-Aug-02 21:58

21-Aug-02 21:58

Alternatively, capture the MouseDown event when clicked on the whole surface of the form (a picture in your case), then capture the MouseMove event to relocate and finally the MouseUp event to set the new position.

Hope this helps Smile | :)

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

Nnamdi Onyeyiri22-Aug-02 3:21

22-Aug-02 3:21

hows leppielib coming? Big Grin | :-D

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

leppie22-Aug-02 3:35

22-Aug-02 3:35

You know what, just as I finish my nice Winamp 2.xx Control class, they go and release Winamp 3 which works totally different Frown | :(

other than that and the still uncompleted Download class, its still pretty much the same.... Dead | X|

BUT, to solve the Winamp (sound really) , I have started working on a managed sound library wrapper for an existing multipurpose soundlib dll. It supports various sound formats including mp3, wav, mod, xm, s3m and CD and more! The existing soundlib is actually more orientated for game development (and includes 3D sound positioning as well as 3D listener positioning) than just a player, so it has many possibilities. In fact it is the same sound library used in EA's F1 2002 Smile | :)

. It is based on the DirectSound interface.

At the moment it is about 80% complete and all the C++ is driving me nuts Smile | :)

.
I will up it as soon as I'm done as it shows (well, according to me anyways) how to wrap an unmanaged dll in a managed assembly. My goal is though to implement it fully and not just what I need.

BTW, did u sort out your problem?

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

Nnamdi Onyeyiri22-Aug-02 3:42

Access To Registry of Remote System

22-Aug-02 3:42

leppie wrote:
BTW, did u sort out your problem?

no - ill get back to it though - its on my TODO list.

i just thought of another thing to have a crack at, so im gonna do that now.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

Sarith Sutha21-Aug-02 17:47

Sarith Sutha

21-Aug-02 17:47

Hi Guys,
How to Access the Registry of Remote System? Code snippets or links would be of great help.

Thanks in advance,

sarith sutha

openning Word in MDI form as child with limited functionalities

cloudno921-Aug-02 10:30

cloudno9

21-Aug-02 10:30

is it possible to open MS Word in MDI form as a child with limited functionalities (probably no menus and toolbar)and C# controls all file opening, printing, editing and close option in word?

any help will be appriciated.

thanks

Pixel Color

marnicola21-Aug-02 9:58

marnicola

21-Aug-02 9:58

How can i get the Pixel color in a Graphic ?
Thanks Poke tongue | ;-P

Re: Pixel Color

Philip Fitzsimons22-Aug-02 0:31

Philip Fitzsimons

22-Aug-02 0:31

Bitmap myPicture;
.
.
.
System.Drawing.Color pixelColor = myPicture.GetPixel(x, y);

"When the only tool you have is a hammer, a sore thumb you will have."

Sizing of controls in a status bar

Nnamdi Onyeyiri21-Aug-02 6:36

Re: Sizing of controls in a status bar

21-Aug-02 6:36

hi all,

im making a status bar that can host any type on control inside it. i wanted to make the status bar class itself handle the sizing of the controls to fit in the panels, but am having a little difficulty, as the actual visible size of the control will vary, depending on whether or not it has a border, but i cannt check this, because not all controls allow to change the border style.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

leppie21-Aug-02 8:20