C / C++ / MFC

Re: How to capture KeyDown event in Dialogue based MFC Application ?

28-Aug-05 21:07

You'll have to handle the WM_KEYDOWN message in PreTranslateMessage member function.

<br />
BOOL CYourDlg::PreTranslateMessage(MSG* pMsg) <br />
{<br />
	// TODO: Add your specialized code here and/or call the base class<br />
	if(pMsg->message == WM_KEYDOWN)<br />
        {<br />
          ... // put your stuff here <br />
        }<br />
	return CDialog::PreTranslateMessage(pMsg);<br />
}<br />

I hope it helps,
Marc Soleda.

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

Eytukan28-Aug-05 22:49

Eytukan

28-Aug-05 22:49

Modifing the above code can we find which particular key is pressed?

Thanx
V

Re: How to capture KeyDown event in Dialogue based MFC Application ?

Eytukan28-Aug-05 22:57

Eytukan

28-Aug-05 22:57

pMsg->wParam right? GOT IT!! Big Grin | :-D

Thanx
V

Re: How to capture KeyDown event in Dialogue based MFC Application ?

Marc Soleda28-Aug-05 23:05

Re: How to capture KeyDown event in Dialogue based MFC Application ?

28-Aug-05 23:05

You're right !! Big Grin | :-D

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

Eytukan28-Aug-05 23:55

Eytukan

28-Aug-05 23:55

is it possible to capture other windows' events (without using Hooks?)

Thanx
V

Re: How to capture KeyDown event in Dialogue based MFC Application ?

Amarelia29-Aug-05 0:15

Amarelia

29-Aug-05 0:15

Thank you very much for spending your time to read my question.

Still to apply what you have said....but I'll definitely try this one as well

Regards

Amarelia Maehsh
Gujarat
India

Kill Win32 Application

MadhukarG28-Aug-05 20:35

MadhukarG

28-Aug-05 20:35

Hello All,

I have implemented a simple "hello world" WIN 32 Application which displays a tray icon when application is running and removes tray icon when application is closed.

My problem is when i kill the applcation process from task manager, the tray icon still remains in system tray. When I move the mouse cursor over the tray icon then the tray icon is removed.

Will it be possible to remove the tray icon when application is killed from task manager.

Any help is truly appreciated?

Thanks and Regards,
Madhu

Zdeslav Vojkovic28-Aug-05 21:18

Zdeslav Vojkovic

28-Aug-05 21:18

you need to call something like this before exiting your app:

Shell_NotifyIcon(NIM_DELETE, &nidIconData);

Zdeslav Vojkovic28-Aug-05 21:19

Zdeslav Vojkovic

28-Aug-05 21:19

ooops, sorry, i guess i am still sleepy, i missed that "when killed from task manager" part

Cedric Moonen28-Aug-05 21:18

Cedric Moonen

28-Aug-05 21:18

One important thing: killing an application is a really bad thing to do Smile | :)

. When you kill an application, the clean-up code is not executed and that's why your icon still remains. The best solution to this problem: quit your application normally Smile | :)

. Your application isn't supposed to be finished with the task manager killing it.

Marc Soleda28-Aug-05 21:23

28-Aug-05 21:23

If you kill it by your task manager you can't predict what will happen and ensure that the icon is removed ... Unsure | :~

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

MadhukarG28-Aug-05 21:45

MadhukarG

28-Aug-05 21:45

Thanks for the reply.

My application is launched from installation. The applcation runs similiar to daemon or service. So, i need to terminate the process during uninstallation. I am using TerminateProcess() to kill the applcation.

Is there any alternative solution?

Thanks & Regards,
Madhu

Marc Soleda28-Aug-05 22:25

28-Aug-05 22:25

You have 2 options after TerminateProcess() has killed it:

- Try Shell_NotifyIcon[^]with NIM_DELETE.
- Or force a repaint if you have the handle of the system tray:

<br />
CWnd *tray=FindWindow("Shell_TrayWnd", NULL);<br />
tray->SendMessage(WM_PAINT,0,0);<br />

Marc Soleda.

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

-- modified at 4:30 Monday 29th August, 2005

conversion of ascii to char in vc++

ThatsAlok28-Aug-05 23:33

ThatsAlok

28-Aug-05 23:33

MadhukarG wrote:
I am using TerminateProcess() to kill the applcation.

Why are you using TerminateProcess to Kill the process(Even MSDN caution you tp use that in extreme case), why don't you WM_QUIT/WM_CLOSE or similiar function to close the application

"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

Member 158774128-Aug-05 20:18

Member 1587741

28-Aug-05 20:18

11:46 am IST Monday Aug 29, 2005
Good Morning,
How can I convert ascii code to char in vc++ for ascii codes between 128 - 255.

Christian Graus28-Aug-05 20:20

Christian Graus

28-Aug-05 20:20

converting int to char is implicit, it happens by itself.

Christian Graus - Microsoft MVP - C++

toxcct28-Aug-05 20:24

toxcct

28-Aug-05 20:24

a char in C/C++ is only an integer which contain the ascii code (1 byte so) of the character it stores.

so, writing the two following lines is equal :

char c = 57;
 
char c = 0x39;
 
char c  = '9';

TOXCCT >>> GEII power
[toxcct][VisualCalc]

[Message Deleted]

kakan28-Aug-05 21:20

kakan

28-Aug-05 21:20

[Message Deleted]

normanS28-Aug-05 21:50

normanS

28-Aug-05 21:50

Since you mention codes 128 - 255, it is probably better to use unsigned char, since char will be negative in that range.

As other replies have said, char and ASCII codes are the same thing. You can see either a character or a numeric value when using printf (or whatever other output).

To see the difference, try the following:

<br />
char cMyChar;<br />
unsigned char ucMyUnsignChar;<br />
uMyChar = 77; // ASCII for "M"<br />
ucMyUnsignChar = 77;<br />
printf ("Character is %c, value is %i, unsigned is %c, unsign value is %i.\n",uMyChar,uMyChar,ucMyUnsignChar,ucMyUnsignChar);<br />
ucMyChar = 220; // Some "upper ASCII" character<br />
ucMyUnsignChar = 220;<br />
printf ("Character is %c, value is %i, unsigned is %c, unsign value is %i.\n",uMyChar,uMyChar,ucMyUnsignChar,ucMyUnsignChar);<br />

NOTE: I'm not sure if this is correct - I don't have access to a C compiler on my office PC. I'm sure others will help!