Re: GetOverlapedresult - C / C++ / MFC Discussion Boards

valikac2-May-02 21:09

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

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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

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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

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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

console cursor question

Ryan28452-May-02 17:01

Ryan2845

2-May-02 17:01

hey im pretty new to c++ and need some help.

is there any way to turn off the little blinking white cursor in the c++ console?
i need to turn it off for a game
thx

Re: console cursor question

Nish Nishant2-May-02 17:15

Nish Nishant

2-May-02 17:15

SetConsoleCursorInfo
Set the bVisible member of CONSOLE_CURSOR_INFO to false

Nish

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Re: console cursor question

Ryan28452-May-02 17:53

Ryan2845

2-May-02 17:53

alright thx for the reply, but do u think u can give me a little help on how to use it? i get a buncha errors, im probably putting it all in wrong

Re: console cursor question

Nish Nishant2-May-02 18:30

Nish Nishant

2-May-02 18:30

Ryan2845 wrote:
alright thx for the reply, but do u think u can give me a little help on how to use it? i get a buncha errors, im probably putting it all in wrong

Okay. I just put together a small program. The cursor did vanish Smile | :)

char abc[128];

int main(int argc, char* argv[])
{
	HANDLE h;
	h= CreateConsoleScreenBuffer(GENERIC_WRITE|GENERIC_READ,
		FILE_SHARE_READ|FILE_SHARE_WRITE,
		NULL,CONSOLE_TEXTMODE_BUFFER,NULL);
	SetConsoleActiveScreenBuffer(h);
	CONSOLE_CURSOR_INFO cci;
	cci.dwSize = 90; //don't make this 0. it won't vanish then. - nish
	cci.bVisible=false;
	SetConsoleCursorInfo(h,&cci);
	cin >> abc; //no cursor at this point. cool eh?
	return 0;
}

Hope this helps you,
Nish

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Re: console cursor question

Ryan28452-May-02 18:45

Ryan2845

2-May-02 18:45

hmm thats what im goin for but how can i get it to work in this sort of program:
i'm making sort of a space invaders style game, i have a loop that outputs a ship made from text <-0-> in an array, when i put that code u gave me in it doesn't show the ship, is there any way to get the ship to show and still have no cursor?

Is there maybe a way to just make the cursors color be black?

thx agian

Re: console cursor question

Nish Nishant2-May-02 19:18

Nish Nishant

2-May-02 19:18

Ryan2845 wrote:
when i put that code u gave me in it doesn't show the ship, is there any way to get the ship to show and still have no cursor?

I really don't think that hiding the cursor will rsult in the hiding of the ship too. I think the problem must be elsewhere.

Ryan2845 wrote:
Is there maybe a way to just make the cursors color be black?

The cursor is usually the same color as the forground text. I am not sure whether it's color can be changed.

Nish

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Re: console cursor question

Ryan28452-May-02 19:23

Ryan2845

2-May-02 19:23

alright, ill keep messin with it, thx a million!
if u have the time/desire, i can email u the code.

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