C / C++ / MFC Discussion Boards

5-Oct-01 3:33

How can make my window as "Always on top"?
I mean My Window is always on top of other applications, If other application is activated.
This type of thing happens in the Help also.

I hope you can understand. What my Question (I HOPE)
I know my english is bad.
Thanks in Advance - Smile | :)

Re: Advance

Chaos Lawful5-Oct-01 4:20

Chaos Lawful

5-Oct-01 4:20

You can create a windows use CreateWindowEx() function and use WS_EX_TOPMOST style. For example:

HWND hWnd;
hWnd=CreateWindowEx(
WS_EX_TOPMOST,
...,// class name
...,// window name
WS_OVERLAPPEDWINDOW,
...); Smile | :)

Law is meaningless without chaos.
Chaos without Law is equal to destruction.
Chaos and Law create our rich and colorful world.

Re: Advance

Michael Dunn5-Oct-01 8:34

Michael Dunn

5-Oct-01 8:34

See the VC forum FAQ.

--Mike--
http://home.inreach.com/mdunn/
"Listen you footwarriors, can you hold down a bit with the firing? I've just got three impromptu weddings breaking out behind me!" -- Arthur Dent
Heart | [heart]

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Reading data from Ethernet port

5-Oct-01 3:28

I need some help ... actually just to be pointed in the right direction, since I haven't dealt with this before.

I have a device that sends data out an RS-232 serial port, but it also sends data to an Ethernet port. The serial port data is handled by a separate device, but now I want the "controller" PC to read the data from the Ethernet port. Both the data-sending device and the PC have been set up with IP addresses in the same domain, and other 3rd party software reads and displays the data, so I know the PC is connected properly. Only these 2 devices are connected, so there is no other network connectivity.

So, a few questions: Confused | :confused:

- What kind of functions do I use to read data from the Ethernet Port?
- Does the data come as a serial byte stream, or is it in packets? Do I have to do my own message parsing and header-byte syncing, and then extract message data of interest?
- How do I need to "open," or "initialize" the port?
- How does all this work?

CodeProject articles, a web site, the name of a couple of functions that I can track down in the documentation, etc, is all I'm looking for right now. I haven't had much luck so far in tracking down just what I need.

Thanks,
Dave

Re: Reading data from Ethernet port

Michael P Butler6-Oct-01 9:32

Michael P Butler

6-Oct-01 9:32

I think you need to look at Sockets. Try searching MSDN for Socket API.

Hope this helps,

Michael Smile | :)

OpenGL and black border

Kristian Nilssen5-Oct-01 0:52

Kristian Nilssen

5-Oct-01 0:52

When I stretch the OpenGL MFC window past a certain point, my OpenGL rendered scene gets a black border. The border tends to grow as I increase the client area of the window. The bug happens most of the time, not always. Any ideas?

Re: OpenGL and black border

5-Oct-01 2:44

This is happaned only if you use combination of MS software render and Windows 2000. This can be fixed with some tricky changes of Windows's size.

Converting back from CWnd::Message to SendMessage

James Spibey4-Oct-01 23:56

James Spibey

4-Oct-01 23:56

Can anyone give me some pointers on how I would send the data I receive in a CWnd Overloaded function to another window using SendMessage.

For example

void CMyWnd::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
        CWnd::OnKeyUp(nChar, nRepCnt, nFlags);
	
        ::SendMessage(m_hWndTarget, WM_KEYUP, ...)
}

How is this done

James Spibey

Re: Converting back from CWnd::Message to SendMessage

Christian Graus5-Oct-01 0:12

Christian Graus

5-Oct-01 0:12

It depends on the message. In this case WM_KEYUP looks like this:

LRESULT CALLBACK WindowProc(
HWND hwnd, // handle to window
UINT uMsg, // WM_KEYUP
WPARAM wParam, // virtual-key code
LPARAM lParam // key data
);

So you would send it as ::SendMessage(m_hWndTarget, WM_KEYUP, (WPARAM)nChar, (LPARAM) nRepCnt | nFlags);

I *think* that is right, basically you need to make sure you send on the data in the format expected by the message, the info you want will always have come into the message handler at the top.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: Converting back from CWnd::Message to SendMessage

Jon Hulatt5-Oct-01 0:13

Jon Hulatt

5-Oct-01 0:13

void CMyWnd::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags)
{
        CWnd::OnKeyUp(nChar, nRepCnt, nFlags);
        ::SendMessage(m_hWndTarget, WM_KEYUP, (WPARAM) nChar, (LPARAM) ((nFlags * 256) + 1))
}

the lparam for this messages consists on nFlags in bits 31-16, and repeat count in bits 15-0. But the repeat count it always 1 in this message.

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: Converting back from CWnd::Message to SendMessage

Christian Graus5-Oct-01 0:28

Christian Graus

5-Oct-01 0:28

Jon is right and I am wrong - I didn't look at the MSDN properly when I wrote my answer.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: Converting back from CWnd::Message to SendMessage

James Spibey6-Oct-01 11:24

James Spibey

6-Oct-01 11:24

Actually, I have found an easier way. All I have to do is override the DefWindowProc for my window and filter out the messages which I wish to forward:-

LRESULT CMyWnd::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam) 
{
	// Pass key presses to other window
	switch(message)	
	{
	case WM_KEYUP:
	case WM_KEYDOWN:
	case WM_SYSKEYUP:
	case WM_SYSKEYDOWN:
		::SendMessage(m_hWndTarget, message, wParam, lParam);
		break;
	}
	return CWnd::DefWindowProc(message, wParam, lParam);
}

James Spibey

Re: Converting back from CWnd::Message to SendMessage

Paolo Messina5-Oct-01 11:26

Paolo Messina

5-Oct-01 11:26

Maybe you can use CWnd::GetCurrentMessage() and use the returned MSG structure.

Paolo

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)

CListCtrl and Selection...

Bernhard4-Oct-01 23:50

Bernhard

4-Oct-01 23:50

In my program i use a CListCtrl..
Selecting multiple Items.. everything is ok..
but after processing the selection i would like to destroy the selection the user made..
visually it is simple, using SetSelectionMark(-1)...
but msdn says:
"This macro does not affect the selection state of the item"
and this is the problem.. the user clicks "process" once again.. and the same selection gets processed... but i want to delete the section..
the only solution i found would be setting the "ItemState" to NonSelected.. but i had to do this for the whole selection..
is there any other / easier way??

thanks in advance
bernhard

stolen sig#19:
"Just looking for loopholes." W. C. Fields [American actor, 1880-1946, explaining why he was reading the Bible on his deathbed.]

Re: CListCtrl and Selection...

Bret Faller5-Oct-01 6:42

Bret Faller

5-Oct-01 6:42

Well if you are doing the processing in a loop then you could just set the ItemState to Nonselected as soon as you are done processing that item and then when all processing is done set the selection mark to -1.

Bret Faller
Odyssey Computing, Inc.

Re: CListCtrl and Selection...

Michael Dunn5-Oct-01 8:36

Michael Dunn

5-Oct-01 8:36

ListView_SetItemState ( hwndYourList, -1, LVIS_SELECTED, 0 );

turns off the selected state for all items in the list.

--Mike--
http://home.inreach.com/mdunn/
"Listen you footwarriors, can you hold down a bit with the firing? I've just got three impromptu weddings breaking out behind me!" -- Arthur Dent
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WIN CE Setup

Kumar saurabh4-Oct-01 21:53

Kumar saurabh

4-Oct-01 21:53

How can i create setup foe win ce application? Confused | :confused:

Kumar Saurabh
Software Engneer
Syndew Pvt Ltd
New Delhi
India

Directdraw interface

erhemas4-Oct-01 21:47

erhemas

4-Oct-01 21:47

Is it possible to change screen resolution which is not supported by the device driver(for eg. 700x400) by calling IDirectDraw::setdisplaymode?
I want to call this api as setdisplaymode(700,400,16)or
setdisplaymode(200,400,8)

Re: Directdraw interface

Christian Graus4-Oct-01 22:57

Christian Graus

4-Oct-01 22:57

No, no, no. Look up EnumDisplayModes - they are ALL you can set it to, the ones the card supports.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

I need advice about which component to select for specific purpose . Please help !

4-Oct-01 19:57

I need to create a dll component that shows dialog form that performs some things. Smile | :)

This component have to match to work in client program of Delphi.

So Which type of dll I need create for it ? (ATL/ ACTIVE X or another )
Confused | :confused:

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

I maked it as MFC Extention DLL but it works only in client program of VC (not in Delphi !) Cry | :((

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

Please help ! It is very urgent !!!

Re: I need advice about which component to select for specific purpose . Please help !

Bernhard4-Oct-01 21:46

Bernhard

4-Oct-01 21:46

I maked it as MFC Extention DLL but it works only in client program of VC (not in Delphi !)

extension dll's work just in mfc... so you can't use em in delphi, visual basic or whatever..
i am not expert.. but if you want to use the component everywhere you have to use
ActiveX or COM..

to decrease size of the component it is better if you implement it using ATL and not MFC... that makes the whole dll smaller and you don't have to link with the MFC (static or dynamic linking)...

if you need tutorials building a component see the sections in codeproject...

hope this helps a little bit

bernhard

stolen sig #18
"Pseudocode is code to demonstrate a concept, not designed to be run. Like certain Microsoft software. "

Re: I need advice about which component to select for specific purpose . Please help !

5-Oct-01 1:16

Thank you. Rose | [Rose]

So you suggest me to use in ATL.

But I understood that there are problem in ATL if I want to use in class CDialog of MFC and I need use Dialog form as basis to my implementation.

What do you say about it ?

Re: I need advice about which component to select for specific purpose . Please help !

Aaron Schaefer5-Oct-01 6:13

Aaron Schaefer

5-Oct-01 6:13

You can use a dialog resource to make an ATL dialog, but you won't use any MFC classes, like CDialog. There are ATL equivalents of these. In the ATL object wizrd thingy, under the miscellaneous tab, there is a "dialog" option. Chose that. You'll have an ATL dialog. The resulting dialog is NOT a COM object yet, though. Go back into the new object wizrd thingy, and select new Simple object, and make a COM object that contains an instance of the dialog class as a member, and expose functionality of the dialog through the COM objects interface. Then you can use the dialog in VB, or wherever COM objects may be used.

Manny thanks !!! :rose:

6-Oct-01 10:46

Re: I need advice about which component to select for specific purpose . Please help !

Rashid Thadha6-Oct-01 10:50

Rashid Thadha

6-Oct-01 10:50

or you can use WTL (Windows Template Library) for your dialogs

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