C / C++ / MFC Discussion Boards

Shailesh Namjoshi1-May-07 20:16

1-May-07 20:16

am using CMyBclass(for eg) derived from CButton Class from MFC and using DrawItem method for drawing own child controls.Except radiobuttons everthing is perfect till the time....but the thing is i am getting the controls drawn on a window perfectly....now i am getting the problem in handling that....i.e.I need to handle the radio button events ....CHECKED and UNCHECKED.....

....for that i need a Handle of Parent window...

I have options of GetParent() method...I am using like this....

CWnd *p =GetParent(); from where i am getting the handle of that....i want the functionality of radiobuttons to be in my derived class so i am doingn that....

Can Any one find the solution of controlling the radio button in derived class so that event handling can be done in that only....

This is what i am trying to get that handle//....

CWnd *pChild = NULL;

for (pChild=GetWindow(GW_CHILD); pChild; pChild=GetWindow(GW_HWNDNEXT))

{

if (pChild == pBtn)

{

((CRadioButtonEx *)pChild)->SetCheckStatus(false);

((CRadioButtonEx *)pChild)->Invalidate(TRUE);

}

}
Basically m derived class should able to handle the Events associated with the radio buttons....

Can any one know the solution....

How to set a focus to a window which has controls?

eli150219791-May-07 20:05

eli15021979

1-May-07 20:05

Hi,

In my project I have a dialog(let say CMyDialog) which contains
several controls(buttons,edit boxs etc...).
My problem is that I need to catch the WM_KEYDOWN message in my dialog,but
when the dialog becomes active and receives focus,the first control in the dialog receives the focus,and therefor,the dialog doesn't receives the WM_KEYDOWN messages.

Is there any way to set the focus to the dialog only,without passing
the focus to the First control in the dialog?

Thanks,
With best regards,
Eli

Re: How to set a focus to a window which has controls?

Rajesh R Subramanian1-May-07 20:28

Rajesh R Subramanian

1-May-07 20:28

You need to handle PreTranslateMessage() instead.

Re: How to set a focus to a window which has controls? [modified]

Joan M1-May-07 20:39

Joan M

1-May-07 20:39

two ways (that I know):

1. subclass the first control and handle the WM_SETFOCUS.

2. PreTranslateMessage in the dialog and handle the WM_SETFOCUS...

Hope this helps.

-- modified at 3:02 Wednesday 2nd May, 2007

Oooops! I've made a mistake... SEND WM_SetFocus (if needed) and HANDLE WM_KEYDOWN... in the pretranslatemessage.

Re: How to set a focus to a window which has controls?

Rajesh R Subramanian1-May-07 20:54

Rajesh R Subramanian

1-May-07 20:54

Joan Murt wrote:
1. subclass the first control and handle the WM_SETFOCUS.

But what if there are plenty of controls? And the user may click on anything, any time; thus setting the focus on a random control.

Joan Murt wrote:
2. PreTranslateMessage in the dialog and handle the WM_SETFOCUS...

Why to handle WM_SETFOCUS within the PreTranslateMessage()? Confused | :confused:

Won't you rather be handling the key strokes within PreTranslateMessage()? I know the OP asked how to set focus to the dialog. If you were to suggest him something for that reason, fine. Otherwise I think handling the key strokes directly is straight forward.

Re: How to set a focus to a window which has controls?

Joan M1-May-07 21:02

Joan M

1-May-07 21:02

Oooops! my mistake... SEND WM_SetFocus and HANDLE WM_KEYDOWN...

thank you I'll modify it immediately...

Re: How to set a focus to a window which has controls?

Rajesh R Subramanian1-May-07 21:09

Rajesh R Subramanian

1-May-07 21:09

Handling WM_KEYDOWN in PreTranslateMessage() will suffice. No need to do anything with WM_SETFOCUS Smile | :)

Re: How to set a focus to a window which has controls?

Mark Salsbery2-May-07 9:05

Mark Salsbery

2-May-07 9:05

PreTranslateMessage() in the dialog will catch keystroke messages that go to a control??

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: How to set a focus to a window which has controls?

Rajesh R Subramanian2-May-07 21:18

Rajesh R Subramanian

2-May-07 21:18

Mark Salsbery wrote:
keystroke messages that go to a control

That message has to go through PreTranslateMessage() and so, the answer is yes. Just give it a try. Smile | :)

Re: How to set a focus to a window which has controls?

Mark Salsbery5-May-07 5:56

Mark Salsbery

5-May-07 5:56

Cool! I did try it.

Do you know off hand if it is MFC that forwards them to the parent or is it the system?

I dug a bit in MFC but didn't find where it was occurring - I didn't spend too much time on it Smile | :)

Just 'cuz I like to know these things! Smile | :)

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: How to set a focus to a window which has controls?

Rajesh R Subramanian5-May-07 8:27

Rajesh R Subramanian

5-May-07 8:27

Mark Salsbery wrote:
Do you know off hand if it is MFC that forwards them to the parent or is it the system?

I don't get that question. By stating "System", do you mean the OS? Can you please rephrase that? If you have to really dig this stuff out, check out "thrdcore.cpp".

Shog on learning VB6: Ah, that would have been VB6. Kicked my ass anyway.
So easy to learn, just like falling down a flight of stairs...

Re: How to set a focus to a window which has controls?

Mark Salsbery5-May-07 8:49

Mark Salsbery

5-May-07 8:49

Yes I meant the OS. Smile | :)

So, I looked again and found it right away LOL.

I had no idea PreTranslateMessage calls walked up the window heirarchy to the main window (not
that I ever came across a situation where it mattered until this discussion thread Smile | :)

).
Apparently it's for keyboard accelerator handling.

Ya learn something new everyday!

I wonder if this adds a danger to the misuse of PreTranslateMessage I see often on the message
boards...

Thank you so much!
Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: How to set a focus to a window which has controls?

Rajesh R Subramanian5-May-07 9:04

Rajesh R Subramanian

5-May-07 9:04

Mark Salsbery wrote:
Apparently it's for keyboard accelerator handling.

Read this[^] Smile | :)

Mark Salsbery wrote:
I wonder if this adds a danger to the misuse of PreTranslateMessage I see often on the message
boards...

PreTranslateMessage is one thing that is excessively misused. Smile | :)

Shog on learning VB6: Ah, that would have been VB6. Kicked my ass anyway.
So easy to learn, just like falling down a flight of stairs...

Re: How to set a focus to a window which has controls?

Mark Salsbery5-May-07 9:15

Mark Salsbery

5-May-07 9:15

brahmma wrote:
PreTranslateMessage is one thing that is excessively misused.

Indeed!

Thanks for the link...bookmarked for future reference!
Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: How to set a focus to a window which has controls?

Rajesh R Subramanian5-May-07 9:18

Rajesh R Subramanian

5-May-07 9:18

Mark Salsbery wrote:
Thanks for the link...bookmarked for future reference!

Glad that I could be of some help. Cool | :cool:

Shog on learning VB6: Ah, that would have been VB6. Kicked my ass anyway.
So easy to learn, just like falling down a flight of stairs...

Re: How to set a focus to a window which has controls?

eli150219791-May-07 21:17

eli15021979

1-May-07 21:17

Hi,

First,Thanks for your (very) quick reply. Big Grin | :-D

My problem is that I've overrided the PreTranslateMessage method,
and put a breakpoint in that function but I never get to that breakpoint.

However , when I move the focus to one of the controls(for example editbox),
the focused control gets the keyboard events... D'Oh! | :doh:

Is it possible that the controls receives keyboard events but the parent window does'nt????

Thanks again,
With best regards,
Eli

Re: How to set a focus to a window which has controls?

Rajesh R Subramanian1-May-07 21:22

Rajesh R Subramanian

1-May-07 21:22

eli15021979 wrote:
I've overrided the PreTranslateMessage method,
and put a breakpoint in that function but I never get to that breakpoint.

Can you please post that code here?

Re: How to set a focus to a window which has controls?

BarnaKol1-May-07 21:19

BarnaKol

1-May-07 21:19

You may try this...
BOOL CXDlg::PreTranslateMessage(MSG* pMsg)
{
// TODO: Add your specialized code here and/or call the base class
if(pMsg->message==WM_KEYDOWN)
AfxMessageBox("ll");
return CDialog::PreTranslateMessage(pMsg);
}

Barna

download a file from folder

p_1-May-07 18:20

1-May-07 18:20

hi all of u Rose | [Rose]

i need help so please help me
i am preparing a web mail application in which i add a option to download a
file so that when i click on button it will open a folder and we choose file to download
and then it will attach to that
now i want code for this
please help me
thanks a lot Rose | [Rose]

Re: download a file from folder

eugene.genis1-May-07 22:24

eugene.genis

1-May-07 22:24

send me your mobile number then I'll text message the code to you!

Re: download a file from folder

Christian Graus1-May-07 22:28

Christian Graus

1-May-07 22:28

paras_s12 wrote:
now i want code for this

You're obviously thinking of rent-a-coder.

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 )

Re: download a file from folder

Mark Salsbery2-May-07 9:07

Mark Salsbery

2-May-07 9:07

Since nobody was nice enough to provide a link:

RentACoder How Software Gets Done[^]

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

LCD with VC++ [modified]

deeps_cute1-May-07 17:48

deeps_cute

1-May-07 17:48

hi i have to get the data displayed in LCD when i clicked a button in mfc. how to do this.

-- modified at 23:58 Tuesday 1st May, 2007

Arise Awake Stop Not Till ur Goal is Reached.

Re: LCD with VC++

Rajesh R Subramanian1-May-07 20:26

Rajesh R Subramanian

1-May-07 20:26

deeps_cute wrote:
hi i have to get the data displayed in LCD when i clicked a button in mfc. how to do this.

Re: LCD with VC++

Muammar©

1-May-07 21:18

Sorry but you need to read an article to do this not post here.. start with controlling input ports from lpt and learn about lpt addresses and low/high values

Smile: A curve that can set a lot of things straight!
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