C / C++ / MFC

2-Jun-02 19:34

Which win32 API should I use to find out which external window has focus?

Thanks

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Paul M Watt2-Jun-02 19:46

2-Jun-02 19:46

GetFocus will return the handle to the window if that window belongs to the calling threads message queue. If a window in that thread does not have the focus, then the result will be NULL.

If you want to find out the focus window that belongs to a different thread or even a different application, you can call GetForegroundWindow to get a handle to the window with which the user is currently working then associate your threads message queue with that window by calling AttachThreadInput. THen you will be able to successfully call GetFocus on that window and get the handle of the control with the focus.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Mazdak2-Jun-02 21:24

2-Jun-02 21:24

Thank for reply kilowatt.

kilowatt wrote:
, you can call GetForegroundWindow to get a handle to the window with which the user is currently working then associate your threads message queue with that window by calling AttachThreadInput. THen you will be able to successfully call GetFocus on that window and get the handle of the control with the focus.

I can't understand one thing,when I use GetForegroundWindow to get the handle to the window that user is currently working then whats the need for GetFocus?

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Paul M Watt2-Jun-02 21:45

2-Jun-02 21:45

GetForegroundWindow will tell you which is the top-level window that the user is working in. If you wanted to find the actual control that had the keyboard focus you would need to do that other stuff that I described.

I hope that helps.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Mazdak2-Jun-02 22:05

2-Jun-02 22:05

kilowatt wrote:
I hope that helps.

Yes,I got the point now.Thank you. Smile | :)

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Mazdak2-Jun-02 22:32

Changing fonts of my controls at once but how?

2-Jun-02 22:32

Hi again kilo

Do you mean something like this?

HWND hwnd;
DWORD dword;
hwnd = (HWND)GetForegroundWindow();
GetWindowThreadProcessId( hwnd , &dword);
AttachThreadInput( dword , GetCurrentThreadId()  ,true);
hwnd = GetFocus();

Thanks

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Atilla Selem2-Jun-02 19:23

Atilla Selem

2-Jun-02 19:23

i have a dialog based app and too many CMyRichEdit controls used in it.
i wanted to change fonts of my CMyRichEdit objects in MyRichEdit.cpp but i could not succeed.
Where should i start from?
When i do it in my OnInitDialog in CMyDialog class i achieved to change fonts of my individual CMyRichEdit controls
but i want to change all controls at once.

Is there anyone who can help me?

Thanks for ur help,
Atilla Selem

just listening to you...

Re: Changing fonts of my controls at once but how?

Ed Gadziemski3-Jun-02 11:32

Ed Gadziemski

3-Jun-02 11:32

It might help if you explain why you could not succeed in changing fonts in MyRichEdit.cpp. You would normally set the font in the CMyRichEdit class.

Basic GDI question

Nish Nishant2-Jun-02 19:10

2-Jun-02 19:10

How do I draw a pixel into a CView?
What's the API call to draw a pixel?

I guess I put all the code in the OnDraw of the CView derived class!

Regards
Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Nish Nishant2-Jun-02 19:15

2-Jun-02 19:15

CDC::SetPixel

Thanks

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Paul M Watt2-Jun-02 19:42

2-Jun-02 19:42

How many SetPixel operations will you be performing?
If you are doing a lot, you may want to consider creating a bitmap and accessing the bits directly becuase set pixel will slow your program down by orders of magnitude.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Nish Nishant2-Jun-02 19:56

2-Jun-02 19:56

kilowatt wrote:
How many SetPixel operations will you be performing?
If you are doing a lot, you may want to consider creating a bitmap and accessing the bits directly becuase set pixel will slow your program down by orders of magnitude.

I am trying to decrypt an unknown image format! I wanted to try out different combinations and reproduce the image. We have a hard copy of the image and the image file [some kinda custom format from the mid 80s]

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Paul M Watt2-Jun-02 20:16

2-Jun-02 20:16

Sounds interesting?

Are you doing that for fun, or have you tried to find the decoder and it is not available?

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Nish Nishant2-Jun-02 20:23

2-Jun-02 20:23

kilowatt wrote:
Are you doing that for fun, or have you tried to find the decoder and it is not available?

Part fun, part serious. We have a client who's been using this image format for almost 20 years. The main program is in GWBASIC and they have this external program [written with assembler]. Partial sources available. Long assembler listings Frown | :-(

I understand that the first 32 bytes is some kinda header. The rest of it has a lot of 0xFFs in them. I am assuming the 0xFFs are the black spaces and am making guessed at what the other bytes mean.

One problem is I don't know the width of the image in pixels!!!

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Re: Basic GDI question

Mike Nordell3-Jun-02 23:04

Mike Nordell

3-Jun-02 23:04

Nish wrote:
How do I draw a pixel into a CView?

Don't, it will be dog slow. Create a DIB section instead and get direct access to the bits, then blit that bitmap to the view. It will be both much faster and easier to handle.

Re: Basic GDI question

Nish Nishant3-Jun-02 23:18

How telling Windows I'm idle in message loop?

3-Jun-02 23:18

Mike Nordell wrote:
Don't, it will be dog slow

Yeah it sure was slow Frown | :-(

So slow it looked like some kinda animation where I could see it drawing it on screen Frown | :-(

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

2-Jun-02 18:38

Hi,
I have pure Win32 based project with own message loop, something like:

CreateWindow();
for (;; )
{
	EngineMain();		//render stuff
	if(!PumpMessage()) break;	//handle all window messages
				//...until OpenGL window should be closed
}
DestroyWindow();

When there is nothing todo (e.g. dialog is miminized) I would like to tell Windows that I'm idle. Currently the CPU consumption is allways 100%, because the message loop is running like crazy, hehe. Well, I'd like to avoid that.

thx, Moak Smile | :)

Michael Dunn2-Jun-02 18:39

Michael Dunn

2-Jun-02 18:39

You code never blocks, like GetMessage() normally does. You need some mechanism to make your thread block (and thus receive no CPU time) when the queue is empty, then unblock when a message arrives in the queue.

--Mike--
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2-Jun-02 18:46

thx, i did without PeekMessage and it blocks + CPU consumption is low!

Paul M Watt2-Jun-02 19:49

2-Jun-02 19:49

I am just curious, how did you end up doing it?

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

3-Jun-02 5:34

kilowatt wrote:
I am just curious, how did you end up doing it?

I'll block with WaitMessage() when there is no window visible. Member variable m_data.bVisible is set in my WindowProc callback handler (have a look on WM_SIZE).

BOOL CBlueSharkEngineWindow::PumpMessage()
{
	assert(m_data.bCreated);
	assert(m_pInterface);

	MSG msg;
	while (::PeekMessage (&msg,NULL,0,0,PM_NOREMOVE))	
	{
		if (!::GetMessage (&msg, NULL, 0, 0)) 
		{
			m_pInterface->pConsole->Logfile(SHARKENGINE_LOG_DEBUG3, "Quit message received");
			return FALSE;			
		}

		::TranslateMessage (&msg);
		::DispatchMessage (&msg);
	}

	if(!m_data.bVisible) WaitMessage();
	
	return TRUE;
}

Greets, Moak

redirecting mouse button ??

Alexandru Savescu2-Jun-02 21:47

Alexandru Savescu

2-Jun-02 21:47

I think you should create a worker thread that does whatever your EngineMain funtion is doing. Thus, you can still handle all other Windows messages

Best regards,
Alexandru Savescu

Alek2-Jun-02 18:01

Alek

2-Jun-02 18:01

I used SetWindowsHookEx(WH_MOUSE,....) to get mouse message.
After get mouse message(like WM_RBUTTONUP...)I need to redirect it.
For example, when user clicks right button, I want call 'Run...' dialog.
I know that I need to disable popup menu and then to do what I want it to do.

Below is my code:

HHOOK glhHook = NULL;
HINSTANCE glhInstance = NULL;
glhook = SetWindowsHookEx(WH_MOUSE, MouseProc, glhInstance, 0);
.
.
.
LRESULT WINAPI CALLBACK MouseProc(int nCode, WPARAM wp, LPARAM lp)
{
if(wp == WM_RBUTTONUP)
{
// do something....

((MOUSEHOOKSTRUCT*)lp->hwnd = NULL;
((MOUSEHOOKSTRUCT*)lp->wHitTestCode = NULL;
((MOUSEHOOKSTRUCT*)lp->dwExtraInfo = NULL;
return false;
}
}

but it still show the popup menu and ignore the action I want to do
why???
Is anybody can give me some suggestion?

Re: redirecting mouse button ??

Paul M Watt2-Jun-02 18:29