About the WM_ENABLE? - C / C++ / MFC Discussion Boards

Re: IE web browser plugins

Prakash Nadar29-Jan-04 23:09

Prakash Nadar

29-Jan-04 23:09

Sorry i dont have much info about that, but there are ie plugin samples using wtl here on cp.

Toughest Steel Comes From Hottest Furnance

how to convert text into image using VC++6.0

emmatty29-Jan-04 18:39

emmatty

29-Jan-04 18:39

hello firends,

how can i convert text into image programmitically. Cry | :((

Re: how to convert text into image using VC++6.0

basementman30-Jan-04 10:04

basementman

30-Jan-04 10:04

Draw the text into a device context using TextOut or DrawText, then get the bitmap from the device context.

onwards and upwards...

Fill Color in a static control at runtime

swarnamanoo29-Jan-04 18:15

swarnamanoo

29-Jan-04 18:15

I want to fill a chosen color from the color palette in a static control at runtime.How can i do it?

Re: Fill Color in a static control at runtime

amit sebiz29-Jan-04 19:28

amit sebiz

29-Jan-04 19:28

Create a custom derived class of any control and handle the WM_ERASEBACKGROUND in that class.create a solid brush of required color and paint the background(Note do it after calling base classes OnEraseBachGrnd).

how to disable Shift key

wow999929-Jan-04 18:14

wow9999

29-Jan-04 18:14

hi there

1.How to disable Shift key?
2.How to change Shift key function to let it become as same as Ctrl key?

Re: how to disable Shift key

Anonymous30-Jan-04 2:52

Anonymous

30-Jan-04 2:52

You can use GetKeyState() in you WM_KEYDOWN processing to check the state of the shift key; or you can simply process the WM_KEYDOWN message and check the wParam parameter for VK_SHIFT and then use SendMessage() to post a new message with VK_CONTROL.

About the WM_ENABLE?

zhaopzhi29-Jan-04 18:13

zhaopzhi

29-Jan-04 18:13

To make the control of IDC_RADIO1 to be enabled state,I tried SendDlgItemMessage and EnableWindow respectively.The result is the statement "EnableWindow(GetDlgItem(hDlg,IDC_RADIO1),TRUE);" succeeds, but the "
SendDlgItemMessage( hDlg, IDC_RADIO1, WM_ENABLE, (WPARAM)0L, (LPARAM)0L );" is failing! Why???

The following is my codes:

// Mesage handler for about box.<br />
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)<br />
{<br />
  switch (message)<br />
  {<br />
   case WM_INITDIALOG:<br />
        return TRUE;<br />
   case WM_COMMAND:<br />
        switch(LOWORD(wParam))<br />
        { <br />
         case IDOK:<br />
	case IDCANCEL:<br />
	     EndDialog(hDlg, LOWORD(wParam));<br />
	     return TRUE;<br />
	case IDC_BUTTON1:<br />
	    //SendDlgItemMessage( hDlg, IDC_RADIO1, WM_ENABLE, (WPARAM)TRUE, (LPARAM)0L );//fail!<br />
	    EnableWindow(GetDlgItem(hDlg,IDC_RADIO1),TRUE);//succeed.<br />
	   //SendDlgItemMessage( hDlg, (int)IDC_BUTTON2, WM_ENABLE, (WPARAM)0L, (LPARAM)0L );//fail!		 		<br />
	   //SendMessage(GetDlgItem(hDlg,IDC_RADIO1), WM_ENABLE, (WPARAM)0L, (LPARAM)0L );//fail!<br />
	   break;<br />
	}<br />
	break;<br />
   }<br />
   return FALSE;<br />
}

Rap off for you,for me,for our human.

Re: About the WM_ENABLE?

Weiye Chen29-Jan-04 20:26

Weiye Chen

29-Jan-04 20:26

From msdn:
The WM_ENABLE message is sent when an application changes the enabled state of a window. It is sent to the window whose enabled state is changing. This message is sent before the EnableWindow function returns, but after the enabled state (WS_DISABLED style bit) of the window has changed.

So i think WM_ENABLE is like a notification message and its handler isn't really responsible for changing the state of the control.

<font=arial>Weiye Chen
When pursuing your dreams, don't forget to enjoy your life...

Need a SDK Cool Button

Cael29-Jan-04 18:08

Cael

29-Jan-04 18:08

Hello!

I need a cool Button (with MouseOver, MouseLeave and all other cool stuff), but I don't wann use any MFC Class. I need a pure SDK Cool Button.

Some ideas?

Thanxs.

Blush | :O

Re: Need a SDK Cool Button

alex.barylski29-Jan-04 18:12

alex.barylski

29-Jan-04 18:12

The hover buttons here on CP would be easy enough to port.

The word of the day is legs, let's go back to my house and spread the word Poke tongue | ;-P

Re: Need a SDK Cool Button

Cael30-Jan-04 3:48

Cael

30-Jan-04 3:48

All the hover buttons on CodeProject use MFC classes, and I need it pure SDK.

Thanks anyway! Frown | :(

Re: Need a SDK Cool Button

Michael Dunn29-Jan-04 19:43

Michael Dunn

29-Jan-04 19:43

Check out WTL::CBitmapButton, which should be easy to port to straight APIs since WTL's GDI wrappers are pretty thin.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber | RightClick-Encrypt
You cannot stop me with paramecium alone!

Detecting that a window has closed

Ryan Binns29-Jan-04 18:07

Ryan Binns

29-Jan-04 18:07

What would be the "best" way to detect if a window in another process has closed (either been destroyed or received a WM_CLOSE)? I can think of 2 solutions:

Sit in a busy loop calling IsWindow() on the HWND of the window
Install a WH_CBT hook and look for the HCBT_DESTROYWND notification code

The first option is the easiest, but not good in terms of efficieny. The second is slightly more complex (though it's not too difficult) and would involve interprocess communication. It also has a performance hit on the system, although its processing would not be complex.

Does anyone have any other solutions?

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: Detecting that a window has closed

basementman30-Jan-04 10:16

basementman

30-Jan-04 10:16

Many more options if you control the source of the app that you need to monitor. If so, then you can broadcast a message, or set an Event, etc. in the OnDestroy of the window in question

onwards and upwards...

detecting logoff vs shutdown. WM_Endsession ??

rohit.dhamija29-Jan-04 18:07

rohit.dhamija

29-Jan-04 18:07

Dear All,

I am developing an dialog based application using MFC VC++ Version 6.0 for Windows 2000.

The application needs to perform certain tasks immediately before logging off /shutdown of the

system respectively.

For detecting logoff/shutdown i have handled WM_ENDSESSION event. OnEndSession call informs the

CWnd object whether the session is actually ending and this event is fired for both logoff as

well as for shutdown.

I need to detect the difference between log off event and shutdown event because I need to

perform seperate functions on logoff and shutdown.

Am I capturing the right event for handling this issue ? Also if possible please suggest any

alternate way to perform the same.

Waiting for your reply.

Regards,
Rohit

Re: detecting logoff vs shutdown. WM_Endsession ??

pankaj hedau17-Sep-10 21:43

pankaj hedau

17-Sep-10 21:43

Hi Rohit,
When Logoff or Shutdown events occur it goes in WM_QUERYENDSESSION which in turn sends WM_ENDSESSION.
So as per your need you can distinguish using the lparam value.
If it is ENDSESSION_LOGOFF it is LogOff event and if EWX_LOGOFF it is ShutDown Event as per my observation and Testing.

Pankaj

0x8000??????

wow999929-Jan-04 18:06

wow9999

29-Jan-04 18:06

Hi there

SHORT nState = GetAsyncKeyState(VK_CONTROL);
BOOL bDown = (nState & 0x8000);

what does 0x8000 mean and where can i find the infomation?

By the way,
What does (nState & 0x8000) mean?

Thanks

Re: 0x8000??????

Ryan Binns29-Jan-04 18:11

Ryan Binns

29-Jan-04 18:11

0x8000 is a hexadecimal number equal to 32768 in decimal or 1000000000000000 in binary. The value returned by GetAsyncKeyState() has bit 15 set if the key is down. However, since the value is a 16-bit SIGNED integer, a more intuitive way would be to code it like this:

SHORT nState = GetAsyncKeyState(VK_CONROL);
BOOL bDown = (nState < 0);

If the state is less than 0, the key is pressed, otherwise it is released.

Hope this helps,

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: 0x8000??????

Steve S30-Jan-04 1:35

Steve S

30-Jan-04 1:35

Intuitive?? Big Grin | :-D

The bitmask is better, since it doesn't rely on SHORT being typedef-ed to a signed quantity. I know it should be, but hey, I've still got code from Win3.1 that works, and one day when I have a 64 bit processor, I might port it... Laugh | :laugh:

Steve S

Re: 0x8000??????

Ryan Binns30-Jan-04 1:56

Ryan Binns

30-Jan-04 1:56

Ok, ok. So I find it more intuitive Roll eyes | :rolleyes:

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: 0x8000??????

Steve S30-Jan-04 2:44

Steve S

30-Jan-04 2:44

and I for one, will defend your right to say so.
In my day, of course, one would have done a shift operation (or was that a rotate left? Ah, that's why I've stopped writing assembly code Blush | :O

) and tested the carry flag... Sigh | :sigh:

Steve S

Re: 0x8000??????

Ryan Binns30-Jan-04 3:00

Ryan Binns

30-Jan-04 3:00

Steve S wrote:
In my day, of course, one would have done a shift operation (or was that a rotate left?

Either one would work, as long as you used a 16-bit shift Wink | ;)

BTW, what do you mean your day?? I'm 23, and still write assembler :P

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: 0x8000??????

Tim Smith30-Jan-04 4:22

Tim Smith

30-Jan-04 4:22

But you are young and think it is cool to do ASM.

Back in OUR day we had to. Wink | ;)

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: 0x8000??????

Ryan Binns30-Jan-04 13:25

Ryan Binns

30-Jan-04 13:25

Tim Smith wrote:
you are young and think it is cool to do ASM.

Wrong. I do VC++ mainly, but I also do a lot of embedded programming - not much choice there... Wink | ;)

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

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