Acquire a View HANDLE :: MFC - C / C++ / MFC Discussion Boards

Re: Toolbar buttons in Dialog Box

LittleYellowBird7-May-02 1:18

LittleYellowBird

7-May-02 1:18

Thanks, I gave this a go and got it working. Great. Smile | :)

ali p

Capture Problem - Directx

Sameer Maggon2-May-02 23:29

Sameer Maggon

2-May-02 23:29

Hi,
I've written a small code (the one given in
MSDN) for capturing video from a camera...

The problem is that i can capture it well..
but when i press the stop button.. the
Camera is not switched off..

Can anybody tell me why???

I am using DirectX (DirectShow)

Please help

Sameer

Button with Bitmap Image

John Clump2-May-02 23:12

John Clump

2-May-02 23:12

Hi everyone. I know this is a bit of a beginner question, but I never had to do this task before and am a bit confused as the best way to do it. I have a button on a dialog, which I want to place a bitmap on (specifically, the little printer bitmap under the graphics/bitmaps directory of VC++). I can either make a CButton object, and do it this way, or use CBitmapButton. I want the button to work like a toolbar button (that is, in the way it looks, and the fact only 1 bitmap is used for all button states, not the up to 4 that CBitmapButton uses).

I was going to use a CButton and place a bitmap on it, but I couldn't figure out how to get my bitmap (which is in the resource file as IDC_BMP_BITMAP) into an HBITMAP parameter, which CButton requires. I tried using CBitmap to get a HBITMAP handle back, but I couldn't quite figure out how to do this. I am sure this is a simple procedure, but it has me stumped tonight Roll eyes | :rolleyes:

Thanks in advance for any help!

Re: Button with Bitmap Image

Michael P Butler2-May-02 23:18

Michael P Butler

2-May-02 23:18

Have a look at the fantastic CButtonST

http://www.codeproject.com/buttonctrl/cbuttonst.asp

Michael Smile | :)

Communication is the first step towards enlightenment.

Re: Button with Bitmap Image

GUEJO4-Jun-02 0:47

GUEJO

4-Jun-02 0:47

I used a class very very useful : CxSkinButton
If you want to have button of every shape and bitmap, try this link and I think you'll be surprised...;)
http://www.codeproject.com/buttonctrl/CxSkinButton.asp

Maybe you could tell me something too ?...
Actually I'm trying to display more than one bmp at the same location but it doesn't work properly...
I use the SetWindowPos function to place the bitmap and stretch it (or shrink it) to the correct size. It works well for the position and the size but not for the Z-Order (the first is over the second and I want the contrary). Setting the first parameter of the SetWindowPos to '&wndTop' does not change anything.
If you could help me...

Should computing stay as a source of benefit or become like knowledge : free and opened to every one ?...

I am looking for cryptografic algorythm...

2-May-02 23:05

... that would work on two keys, public and private, but not like RSA, where message can be encrypted using public key and decrypted using private key. Public key should be able to decrypt message and only private key would be able to encrypt it. I could use RSA and distribute private key, but i think that it is possible to generate public key from private key. Am i wrong?

Re: I am looking for cryptografic algorythm...

markkuk3-May-02 0:06

markkuk

3-May-02 0:06

In RSA, messages encrypted with private key can be decrypted with the public key, that's how RSA is used for digital signatures.

Acquire a View HANDLE :: MFC

valikac2-May-02 21:09

valikac

2-May-02 21:09

Hi.

I often see function parameters requiring a handle to a window. I believe the handle to main fram is m_hWnd. In general, how do you get a handle to a window from main frame to any view including splitters?

Thanks,
Kuphryn

Re: Acquire a View HANDLE :: MFC

Nish Nishant2-May-02 21:19

Nish Nishant

2-May-02 21:19

kuphryn wrote:
how do you get a handle to a window from main frame to any view including splitters?

All CWnd objects will have an m_hWnd which is the underlying window HANDLE.
But to be safe call IsWindow on this handle before trying to do stuff with it, unless you are sure it is a handle to a valid window

Nish

Check out last week's Code Project posting stats presentation from :-
http://www.busterboy.org/codeproject/
Feel free to make your comments.

Re: Acquire a View HANDLE :: MFC

valikac3-May-02 3:52

valikac

3-May-02 3:52

Thanks.

You wrote "call IsWindow() on this handle." How do you go about calling IsWindow on a handle? IsWindow() take not parameters and returns a BOOL.

Kuphryn

Re: Acquire a View HANDLE :: MFC

Nish Nishant3-May-02 4:35

Nish Nishant

3-May-02 4:35

kuphryn wrote:
IsWindow() take not parameters

IsWindow

The IsWindow function determines whether the specified window handle identifies an existing window.

BOOL IsWindow(
  HWND> hWnd   // handle to window
);

Nish

Check out last week's Code Project posting stats presentation from :-
http://www.busterboy.org/codeproject/
Feel free to make your comments.

Re: Acquire a View HANDLE :: MFC

valikac3-May-02 8:59

valikac

3-May-02 8:59

Ahh. Thanks.

In other words, IsWindow() *internally* check m_hWnd to see if it matches that of the current view/window.

Kuphryn

Re: Acquire a View HANDLE :: MFC

Nish Nishant3-May-02 13:54

Nish Nishant

3-May-02 13:54

Actually what it does is to verify that the window handle we have points to a valid window. There might be a situation that a window has closed but we still have a handle to it. In such situations, we must use this function.

Nish

Check out last week's Code Project posting stats presentation from :-
http://www.busterboy.org/codeproject/
Feel free to make your comments.

GetOverlapedresult

meirav2-May-02 20:41

meirav

2-May-02 20:41

i would like to know how to use this function
i tried to do simultaniasly read/write from COM but it didnt work
thanks. Confused | :confused:

Re: GetOverlapedresult

.::RockNix::.3-May-02 1:29

.::RockNix::.

3-May-02 1:29

You have to do the following steps:

1) CreateFile() with FILE_FLAG_OVERLAPPED
2) Create 2 Events by using CreateEvent()
3) Create 2 OVERLAPPED STRUCT and put events (2) in here
4) now use WaitCommEvent(), ReadFile(), WriteFile() with STRUCTS (3) as calling-parameters

That`s it ...

So far ... RockNix///

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------------------------------------

Directx - DirectShow

Sameer Maggon2-May-02 18:11

Sameer Maggon

2-May-02 18:11

Hi,
Has somebody worked on DirectX.. I have a
problem regarding Video Capture..

I am able to capture video from the Camera but
its like i just want one shot and want to
save it in JPG or BMP.. has somebody worked on
it..

Please help

Sameer

Re: Directx - DirectShow

Hadi Rezaee2-May-02 20:11

Hadi Rezaee

2-May-02 20:11

Could you show your source ?
About capturing video from camera ?

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

GetGuiTHreadInfo

Stan the man2-May-02 17:46

Stan the man

2-May-02 17:46

I am not sure if many people uses this call. But I am having trouble with it. From MSDN it should work. But it doesn't for me.

I call this in my Pretranslate fucntion. I get the foregroundwindow for another window program. Now when I click on the other program, it should Get the GUIThreadInfo. I want to get at this message to get the actual CONTROL that has the focus in the active window.

But it is always failing. I can't figure out why. What I want to do is once I get the Control with the focus then I want to use AttachThreadInput and be able process messages in that program's message queue.

Any Ideas? Thanks.

sending mouse messages

vins2-May-02 17:36

vins

2-May-02 17:36

hi,
my application captures the mouse events of an application ,I want to send these events to another window,How do I send mouse events.
Jeremy suggested me Sendmessage,but it did not respond.

SendMessage (handle1,WM_MENUSELECT,MF_MOUSESELECT,0);

where handle1 is handle of the destination window
WM_MENUSELECT is wParam (mouse event)

Thankyou for spending time

Vineet Sharma

Re: sending mouse messages

Alexandru Savescu3-May-02 0:56

Alexandru Savescu

3-May-02 0:56

Is the other window part of the same application, or is it part of another process. Because if it is part of another process, then it is running in different address space and you cannot send or post a message.

Best regards,
Alexandru Savescu

Re: sending mouse messages

vins3-May-02 3:37

vins

3-May-02 3:37

I have two notepad windows,I want to replicate the behaviour of one window to another.Using hooks i trap the keyboard events of first notepad window and send these keystrokes to second window with keybd_event function,it is working fine.
Similarly I have trapped mouse events ,Probably you cannot use sendMessage or post but since hooks code is wriiten in Dll i can force second window to map the dll into its address space and then send messages.Please comment..

Second solution could probably be, as suggested by "argus" to use mouse_event and sendinput,I am working on it ,but currently unable to locate parameter for destination handle.

Thankyou for your concern

Vineet

Re: sending mouse messages

3-May-02 1:23

Check in MSDN:
mouse_event
SendInput

Argus

Linux question about serial ports

Albert Pascual2-May-02 17:14

Albert Pascual

2-May-02 17:14

I am opening a serial com port and writing huge packets. How do I know how many bytes can I write into the port when the other computer reading it?

is something like open()
write()
select()?

Anybody has a sample?

Thanks
Al

Re: Linux question about serial ports

Niklas L2-May-02 21:55

Niklas L

2-May-02 21:55

Do the select() before you write(). Something like

fdSerial = open(...);
fd_set wfds;
struct timeval tv;
memset(&tv, 0, sizeof(struct timeval));
FD_ZERO(&wfds);
FD_SET(fdSerial, &wfds);
int retval = select(1, NULL, &wfds, NULL, &tv); // Check if writable
if (retval) {
  // write is possible
  write(...);
}

Re: Linux question about serial ports

Albert Pascual3-May-02 5:52

Albert Pascual

3-May-02 5:52

Niklas,

Thanks, is any way to know how many characters can I write into the serial port without overwriting bytes?

Thanks again

Al

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