C / C++ / MFC

see me5-Jul-06 17:33

see me

5-Jul-06 17:33

handle ON_WM_KEYDOWN.
You can get information about which key is pressed by user.
Smile | :)

"Dream bigger...Do bigger...Expect smaller"
aji

Ram Murali5-Jul-06 17:39

5-Jul-06 17:39

Can u plz explain with some code. I tried to use ON_WM_KEYDOWN. But i douldnt get it.

Thanx.

Regards,
Ram

ThatsAlok5-Jul-06 18:45

ThatsAlok

5-Jul-06 18:45

Ram Murali wrote:
Can u plz explain with some code. I tried to use ON_WM_KEYDOWN. But i douldnt get it.

have you added that between BEGIN_MESSAGE_MAP and END_MESSAGE_MAP

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Ram Murali5-Jul-06 18:49

5-Jul-06 18:49

Ya i have added that in between BEGIN_MESSAGE_MAP and END_MESSAGE_MAP.

Regards,
Ram

ThatsAlok5-Jul-06 19:20

ThatsAlok

5-Jul-06 19:20

Ram Murali wrote:
Ya i have added that in between BEGIN_MESSAGE_MAP and END_MESSAGE_MAP.

Sorry if my question look childish, Have you added OnKeyDown function plus What is your base class for your window program

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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VC Forum Q&A :- I/ IV
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Ram Murali5-Jul-06 19:26

5-Jul-06 19:26

:(Yes i did that too.

Regards,
Ram

Naveen5-Jul-06 19:33

5-Jul-06 19:33

ThatsAlok wrote:
OnKeyDown

r u saying that u can get the key down event in the combobox just by doing like this. the WM_KEYDOWN message goes to the edit control inside the combobox. It cannot be mapped like this from the dialog class, nor from a class drived from CCcomboBox

nave

ThatsAlok5-Jul-06 19:46

ThatsAlok

5-Jul-06 19:46

Naveen R wrote:
u saying that u can get the key down event in the combobox just by doing like this. the WM_KEYDOWN message goes to the edit control inside the combobox.

I believe you havn't read my question carefully!, after reading your discussion with the PP(Problem Poster), i come to know he need to implement that for Combo Box!

Naveen R wrote:
t cannot be mapped like this from the dialog class, nor from a class drived from CCcomboBox

Really do you need my comment on this?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Naveen5-Jul-06 19:51

5-Jul-06 19:51

ThatsAlok wrote:
i come to know he need to implement that for Combo Box!

its in the first question it self. Cool | :cool:

nave

ThatsAlok5-Jul-06 20:00

ThatsAlok

5-Jul-06 20:00

Naveen R wrote:
its in the first question it self.

then thats my mistake Smile | :)

.... Sorry Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
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VC Forum Q&A :- I/ IV
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Naveen5-Jul-06 20:12

5-Jul-06 20:12

hei,

I found u too fro India. ur from which part of India?

I am from kerala...

nave

Re: keyboard key event [modified]

ThatsAlok5-Jul-06 21:11

ThatsAlok

5-Jul-06 21:11

Naveen R wrote:

I found u too fro India. ur from which part of India?

Haridwar

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Naveen5-Jul-06 18:01

5-Jul-06 18:01

When u press a key in the combobox the message actually goes to the edit control inside the combo box. To trap that event u can do like this.

1 Create a member variable for the combobox say m_ComboBox;
2. Now overide the PreTranslateMessage function of the dialog;
3. in that funtion write like this

BOOL CTest::PreTranslateMessage(MSG* pMsg) <br />
{<br />
    if( WM_KEYDOWN == pMsg->message )<br />
    {<br />
        if( ::GetParent( pMsg->hwnd ) == m_combo.m_hWnd )<br />
        {<br />
            TCHAR tcChar[2] = {0};<br />
            tcChar[0] = pMsg->wParam;<br />
            AfxMessageBox( tcChar );<br />
        }<br />
    }<br />
	<br />
	return CDialog::PreTranslateMessage(pMsg);<br />
}

nave

Ram Murali5-Jul-06 18:15

5-Jul-06 18:15

if i do this, i couldnt able to get the output. the project is comiled and exectued, but there is no output and comeback to the project workspace again.

Y is it like this?

Thanks.

Regards,
Ram

Naveen5-Jul-06 18:24

5-Jul-06 18:24

what type of application did u created? Dialog based?

nave

Ram Murali5-Jul-06 18:42

5-Jul-06 18:42

yes,My application is dialog based. it has only one combobox, nothing more than that. Jus i need to display the characters which has been key-in by the user into the combobox.

Regards,
Ram

Naveen5-Jul-06 18:48

5-Jul-06 18:48

i hope u have created the m_combo variable and mapped the PreTranslateMessage message using the class wizard. isn't it?

did u tried puting breakpoint in the PreTranslateMessage fnuction?

nave

Ram Murali5-Jul-06 18:55

5-Jul-06 18:55

Ya u r correct. I used breakpoint also. Still i couldnt get the output window. I put breakpoint in OnInitDialog and PreTranslateMessage. once i press debug button, it directly goes to pretanslatemessage function and then goes to the end of the program. since i dun input any char

if( WM_KEYDOWN == pMsg->message ) becomes false. so it goes to the end of the pretanslate function. in this case i can see the minimized window in the taskbar. but i couldnt maximize it. eventually i couldnt see the output window. Frown | :(

Regards,
Ram

Naveen5-Jul-06 19:29

5-Jul-06 19:29

will u plz paste the PreTranslateMessage funtion here.

nave

Ram Murali5-Jul-06 19:33

5-Jul-06 19:33

BOOL CTest::PreTranslateMessage(MSG* pMsg)
{
if( WM_KEYDOWN == pMsg->message )
{
if( ::GetParent( pMsg->hwnd ) == m_combo.m_hWnd )
{
TCHAR tcChar[2] = {0};
tcChar[0] = pMsg->wParam;
AfxMessageBox( tcChar );
}
}

return CTest::PreTranslateMessage(pMsg);
}

Regards,
Ram

Naveen5-Jul-06 19:35

5-Jul-06 19:35

Ram Murali wrote:
return CTest::PreTranslateMessage(pMsg);

here lies the problem it should be like this

CDialog::PreTranslateMessage(pMsg);

nave

Ram Murali5-Jul-06 19:40

5-Jul-06 19:40

wow. thats gr8. But now i can able to key-in only one character. cannot key-in more than one char. Frown | :(

Thanx for spending ur time for me. Thanx a lot.

Regards,
Ram

Naveen5-Jul-06 19:41

5-Jul-06 19:41

Ram Murali wrote:
now i can able to key-in only one character.

what do u mean?

nave

Ram Murali5-Jul-06 19:50

5-Jul-06 19:50

Let me explain my objective briefly.

I need to desing combobox in such a way tat user can only enter the character "D", "I" and "0-9", in the combobox. If a user enters other character than the above specified, it should not be displayed in the Combobox. and the maximum no of character user can enter is only 5. this is my objective.

with the current code, i can only enter one character. if i press the other character, the new one replaces the old character in the combobox. lets say i wannu enter "HELLO" if i press "H" message box shows H. then if i enter I, this I replace the H in the combobox. Frown | :(

^)

again thanx a lot for ur spending ur valuable time for me.

Regards,
Ram

Naveen5-Jul-06 19:54