Windows Forms Discussion Boards

jadothebest15-Oct-07 9:58

15-Oct-07 9:58

hi, can i click a button in a child window once i get the button's Handle?
i don't want to use SetCursorPos() combined with mouse_event() to click on a button cause i don't want the Mouse cursor to move/change position.
thanks

Re: click A button Upon giving its handle ?

TJoe15-Oct-07 10:32

TJoe

15-Oct-07 10:32

If you only have the handle to the button, you would have to use SendMessage[^] to send a BM_CLICK[^] message. This[^] describes how to use SendMessage in C#.

If you have the actual .Net Button object, you can use the PerformClick[^] method.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Re: click A button Upon giving its handle ?

jadothebest15-Oct-07 11:58

jadothebest

15-Oct-07 11:58

Thanks for help buddy,
it really helped Smile | :)

your reply was quick too.
thanks again Tom.

After a keyboard hook, GetTopWindow returns the window for ctfmon.exe

alex_bol15-Oct-07 8:35

alex_bol

15-Oct-07 8:35

I am working on an application that must respond to a combination of keys, no matter which application the user is currently using, and that must know what is the application where the user was. I am using for this a keyboard hook, like in the article http://www.codeproject.com/csharp/globalhook.asp

The problem is that after responding to the hook, the only way I can think of to find out which application the user was using is to call GetTopWindow() and then find out the process to which the window belongs. The code returns always "ctfmon.exe". I don't know if this happens because the hook is triggered by ctfmon; in this case, how can I find out which application the user was in?

Can anybody help me?

See the code below:

<br />
        [DllImport("user32.dll")]<br />
        static extern IntPtr GetTopWindow(IntPtr hWnd);<br />
        [DllImport("user32.dll", SetLastError = true)]<br />
        public static extern uint GetWindowThreadProcessId(IntPtr hwnd, out uint lpdwProcessId);<br />
<br />
void FindWindow()<br />
{<br />
        string processName = "Unknown";<br />
<br />
        IntPtr pTopWindow = GetTopWindow(IntPtr.Zero);<br />
<br />
        uint processId;<br />
        if (GetWindowThreadProcessId(pTopWindow, out processId) != 0)<br />
        {<br />
            Process runningProc = Process.GetProcessById((int)processId);<br />
            processName = runningProc.ProcessName;<br />
        }<br />
<br />
        processNameLabel.Text = processName;<br />
}<br />

Thanks a lot,
Alex

Re: After a keyboard hook, GetTopWindow returns the window for ctfmon.exe

Dave Kreskowiak15-Oct-07 10:05

Dave Kreskowiak

15-Oct-07 10:05

Try calling GetForegroundWindow instead.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

How can i intercept Escape button in dialog form?

wolfgangpuelm15-Oct-07 3:10

wolfgangpuelm

15-Oct-07 3:10

Hi,

I'm just moving from MFC to .NET. In MFC, I can easily intercept any message with PreTranslateMessage and do whatever i want with a particular msg. This is especially useful if a user presses the Escape button in a dialog. before all input is gone, i can ask the user if he/she really wants to proceed and discard all input. Should be no problem in .NET neither, i thought. But either it'S so obvious i just can't see it or it's not so easy after all(which would be a surprise since this is a frequently occurring scenario). What i do in respect to the Escape Button: it's assigned the DialogResult.Cancel value and the containing form sets this button's variable name as CancelButton.

Any suggestions from someone?

Thank's in advance!

Wolfgang Puelm

Re: How can i intercept Escape button in dialog form?

Giorgi Dalakishvili15-Oct-07 3:42

Giorgi Dalakishvili

15-Oct-07 3:42

When you drop a button on the form, you can then set the CancelButton property of your form to that button. It means that when escape is pressed the event handler of that button will be invoked. The dialogresult for that button will be set to Cancel.

#region signature
my articles
#endregion

Re: How can i intercept Escape button in dialog form?

wolfgangpuelm15-Oct-07 4:12

wolfgangpuelm

15-Oct-07 4:12

Hi,

thank you very much for your propmpt answer!

But I'm afraid that's not my problem since the default event handler gives me no chance to remove this event (ESC pressed) from the form's message processing queue. That means the dialog will be inevitably be closed and that's what i'm trying to prevent if desired by user input. If this handler had a KeyEventArgs parameter instead of a EventArgs, the KeyEventArgs.Handled property could be set to true which might do the job (if it's passed by reference). Unfortunately, the event handler is implemented as it is.

Once again, thank you for your effort!

Regards

Wolfgang Puelm

Re: How can i intercept Escape button in dialog form?

Mike Dimmick15-Oct-07 4:14

Mike Dimmick

15-Oct-07 4:14

For this I would normally handle the FormClosing event. You'll then get the opportunity to find out why the form is closing by checking the DialogResult property. You should normally make the Cancel button, the Escape key, and the X button in the top-right corner all do the same thing.

If you really want to go down the PreTranslateMessage route, you can implement the IMessageFilter interface and use Application.AddMessageFilter to have the framework call your filter function for each message.

DoEvents: Generating unexpected recursion since 1991

Re: How can i intercept Escape button in dialog form?

wolfgangpuelm15-Oct-07 4:39

wolfgangpuelm

15-Oct-07 4:39

Hi,

Thanks a lot for your answer!
It took me on the right track - at last:
The xxx_FormClosing event has a FormClosingEventArgs parameter. From the MSDN i found out that there is a CancelEventArgs param also. Since it's possible to cast the FormClosingEventArgs into a CancelEventArgs, the latter's Cancel property can be used: if set true, the dialog stays alive, other it get's closed! Big Grin | :-D

Thank's again! Rose | [Rose]

Regards.

Wolfgang Puelm

creating new shell for windows

sresth14-Oct-07 17:52

sresth

14-Oct-07 17:52

can anyone tell me how I can create a new shell for windows xp embedded
I want complete detail regarding this i.e. how do we apporoach this problem, what are the basic skills required and which tools are helpful

Re: creating new shell for windows

Pete O'Hanlon15-Oct-07 1:13

Pete O'Hanlon

15-Oct-07 1:13

sresth wrote:
I want complete detail regarding this

So basically, you want somebody to code this up for you.

sresth wrote:
how do we apporoach this problem, what are the basic skills required and which tools are helpful

If you can't answer these questions then this project is much too ambitious for you.

Deja View - the feeling that you've seen this post before.

Re: creating new shell for windows

TyrionTheImp15-Oct-07 21:00

TyrionTheImp

15-Oct-07 21:00

u can set any windows form as the startup shell with gpedit.msc
take a look at this article :http://www.codeproject.com/useritems/CF_kiosk_mode.asp

How to highlight an item in the ListBox control

Mike Borozdin14-Oct-07 5:19

Mike Borozdin

14-Oct-07 5:19

I want to highlight an item in the ListBox, i.e. make its font bold or make its color green, no matter. I read about the DrawItem event, but unfortunately this item happens only when some action with ListBox is performed, but I want to highlight an item on checking a checkbox that is not in the ListBox.

Re: How to highlight an item in the ListBox control

Mike Borozdin14-Oct-07 7:20

Mike Borozdin

14-Oct-07 7:20

I figured it out, I just use the DrawItem event for manual painting of the control and invoke this event by using the Refresh() method of ListBox.

How to get HWND from System::Windows::Forms::Panel^ panel [modified]

Newbie0014-Oct-07 0:05

Newbie00

14-Oct-07 0:05

Hi
VC++ 2005 EE

I'm writing an app which is going to display some 3D figures on System::Windows::Forms::Panel^ panel

The problem:

I've written my own class which handles all OpenGL stuff. So all I have to do is:
Create new 3D figure object, and draw it with panel's Paint method.
Constructor needs panel's HWND, so i did something like this:

 TFigure *Figure; //pointer to my base class objects<br />
Figure = new TCuboid( (HWND)panel->Handle.ToPointer() , panel->Width, panel->Height, 3, 3, 7 );

But this solution doesn't work properly. When i'm trying to initialize OpenGl machine
with this code (inside TCuboid construcor):

m_gHDC = GetDC( hwnd ); //identifier (window HWND) <br />
  SetupPixelFormat();<br />
  m_hRC = wglCreateContext( m_gHDC ); //identifier (OpenGL graphic context) <br />

the variable: m_hRC is NULL and it shouldn't be.
I've tried my class code with other IDE and all was fine. So i think the problem is with getting panel's HWND.

Can somebody help me please?

-- modified at 9:52 Sunday 14th October, 2007

Text in label is mangled

sudhirkamath9-Oct-07 9:40

sudhirkamath

9-Oct-07 9:40

I have built a windows form using C#( .NET 2.0 ). The form has a label with text set to “:My label text.” When I build and run the form here everything looks fine.

When a person is running the form in UK he sees the label text as “.My label text:”

I am not able to figure out the reason for the colon to be moved to the end and the fullstop to be moved to the front.

I don’t think the UK locale(langauage and region) would be causing this.

Any pointers?

Thanks,
Sudhir

Re: Text in label is mangled

Paul Conrad27-Oct-07 13:37

Paul Conrad

27-Oct-07 13:37

sudhirkamath wrote:
I don’t think the UK locale(langauage and region) would be causing this.

Most likely could be the cause...

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Backup Database Using Threads

jikubhai9-Oct-07 4:25

jikubhai

9-Oct-07 4:25

hello techs,

I have a small project which enables database backups.
I have to to do backup's for multiple database @ a time.
For that i need to use Threading concepts.

the below code is for database backup :
-----------------------------------------------------------------------------------------------------
public void backUpDatabase(string DBname, string setBakUpPath)
{
SqlCommand sCom = new SqlCommand("BACKUP DATABASE " + DBname + " TO DISK = '" + setBakUpPath + "' WITH NOFORMAT, NOINIT, NAME = 'Full Database1 Backup', SKIP, NOREWIND, NOUNLOAD,STATS = 10", sCon);
sCom.CommandType = CommandType.Text;
try
{
sCom.ExecuteNonQuery();
MessageBox.Show("Database " + DBname + " : BackUp Done!", DBname + " BackUp", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (System.Exception ex)
{
MessageBox.Show(ex.ToString(), "Backup ", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
sCom.Dispose();
}
-----------------------------------------------------------------------------------------------------

all the databases will be loaded to a list box and i will select a database and clicks on button "Backup Database" and it will starts backup.... I need to do the backup in a thread. Now on the datagrid ... it will show the "db name", "Status : backup going on/backup done" and finally % of percentage of backup in the third colum of grid (u can avoid if this a bit time consuming... )

Please help me to solve it, if any clarifications needed... please ask ... thanks ...

A123-B321

Re: Backup Database Using Threads

Koltz11-Oct-07 20:57

Koltz

11-Oct-07 20:57

I think db "backup time" depends on db size.
You can check your db backup thread status via standart c# event technick (read msdn for it)

Lock Menus/Toolbars on Window Scroll

Elizma9-Oct-07 0:57

Elizma

9-Oct-07 0:57

Hi Guys and Gals.

I have a window form that has the autoscroll property set to true. This form needs the scroll bars. Now the problem is that I have a menu and a toolbar control. I want it to stay at the top even though I am scrolling to the bottom so that when someone is at the bottom of the screen they can still for instance click the save button without having to scroll all the way to the top.

Can someone please assist me to a solution?

Your help will be greatly appreciated.

Regards,

Elizma

Re: Lock Menus/Toolbars on Window Scroll

Dave Kreskowiak9-Oct-07 6:41

Dave Kreskowiak

9-Oct-07 6:41

Easy. Put your form's contents, except for the toolbars in a Panel control docked to the form and turn on it's autoscroll property.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

AppBars & the ShowDesktop command

TyrionTheImp8-Oct-07 19:33

TyrionTheImp

8-Oct-07 19:33

Hi ,

I`ve implemented AppBars with help from the C# Does Shell-Part 3[^] article , but am having issues with the "Show Desktop" command .

What happens is that the AppBar itself gets minimized but upon restoration , its width becomes half of the earlier value. While debugging , i saw that the AppBar WndProc receives a FullScreenApp OS notification.
I`m handling this as :

if(lParam ==1 & appbar is topmost)
{ send it to bottom of z-order}
else if (lParam ==0 & appbar is bottom)
{ bring appbar to top of the z-order}

I need this logic so that my appbar is hidden when Word or IE enters full-screen mode & also to allow the user to see the start menu window.
Is there any other unique message that the OS sends to all active windows upon "Show Desktop" (other than WM_MINIMIZE) that i can handle ?

Any help or pointers are most appreciated.

Thanks in Advance

Pass handle to form

mjanssen6-Oct-07 9:02

mjanssen

6-Oct-07 9:02

Hi,

I'm quite new to using VC++ and Windows forms. Although forms work well so far, I have an issue passing a handle from my main function to my form.

In main() I open a handle to a device. This handle must be available to my form so that when I click a button, it can use this handle to access my device and perform the intended action.

What is a good way to deal with this ?

regards
Marcel

recursive:
See "recursive"

Re: Pass handle to form

Kristian Sixhøj6-Oct-07 9:13

Kristian Sixhøj

6-Oct-07 9:13

I don't code C++, but as far as I know, the handle (or any other object) can only be accessed from inside the method they were defined in.

If you define the handle outside a method, it should be possible to access it everywhere.

Virtual1ty

"Any fool can learn from his own mistakes, but a wise man learns from mistakes of others"

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.