Re: Draw on screen outside application window - C / C++ / MFC Discussion Boards

Re: WM_NEXTDLGCTL one control too far

baerten24-Jun-08 0:54

baerten

24-Jun-08 0:54

Yes, but i doesn't work for me Sigh | :sigh:

A PostMessage(WM_KEYDOWN,(WPARAM)VK_TAB); sets the focus to the previous control
but with silly sideeffects (insertion bar is still in the initial textbox and the new taped characters are inserted in the new textbox D'Oh! | :doh:

)

Thanks anyway Smile | :)

Re: WM_NEXTDLGCTL one control too far

Rajesh R Subramanian24-Jun-08 1:08

Rajesh R Subramanian

24-Jun-08 1:08

baerten wrote:
A PostMessage(WM_KEYDOWN,(WPARAM)VK_TAB); sets the focus to the previous control

You told me that you read the documentation:

If wParam is zero, the next control receives the focus; otherwise, the previous control with the WS_TABSTOP style receives the focus.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: WM_NEXTDLGCTL one control too far

baerten24-Jun-08 1:23

baerten

24-Jun-08 1:23

Rajesh R Subramanian wrote:
baerten wrote:
A PostMessage(WM_KEYDOWN,(WPARAM)VK_TAB); sets the focus to the previous control

You told me that you read the documentation:

If wParam is zero, the next control receives the focus; otherwise, the previous control with the WS_TABSTOP style receives the focus.

That was just for testing (in this case i use a WM_KEYDOWN and not a WM_NEXTDLGCTL Smile | :)

)

Re: WM_NEXTDLGCTL one control too far

Nibu babu thomas24-Jun-08 0:21

Nibu babu thomas

24-Jun-08 0:21

baerten wrote:
is not set on the next
control but is set on the second next control.

Try GetNextDlgTabItem(PrevWnd)->SetFocus().

BTW read the docs carefully on WM_NEXTDLGCTL. It has some detail associated with it.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: WM_NEXTDLGCTL one control too far

baerten24-Jun-08 0:50

baerten

24-Jun-08 0:50

Yes, i already read the MSDN-Documentation.

I don't have a handle to the next control.
I call the WM_NEXTDLGCTL in a universal function, which sets only
the focus on the next control, wherever the control is placed.

In my case:

I hit the F2-Key on a certain textbox. A Dialog opens modal and shows a Grid.
The user selects a line and the Dialog places a string into the textbox (where the user hit's the F2-Key)
Then i post the WM_NEXTDLGCTL Message so that the next textbox is selected.

Thanks

Re: WM_NEXTDLGCTL one control too far [modified]

Nibu babu thomas24-Jun-08 1:36

Nibu babu thomas

24-Jun-08 1:36

baerten wrote:
WM_NEXTDLGCTL in a universal function, which sets only
the focus on the next control, wherever the control is placed.

Well for testing purpose, I put this event call in a timer

void OnTimer( UINT Id )
{
  PostMessage( WM_NEXTDLGCTL, FALSE, FALSE );
}

Works well for me, focus shifts properly around all controls in the dialog. Then I put it in a button event handler, after this the focus always moved to the Cancel button, guess why? Smile | :)

So you need to watch out for such issues.

A wild guess! Are you posting WM_NEXTDLGCTL twice, since it's a post message you wouldn't know, a suggestion would be replace PostMessage with SendMessage(MSDN says don't) for testing purpose to find out where if at all a duplicate one is being posted, since it blocks. Don't forget to revert back to PostMessage.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

modified on Tuesday, June 24, 2008 8:00 AM

Draw on screen outside application window

garyofcourse23-Jun-08 23:19

garyofcourse

23-Jun-08 23:19

Hi. I am programming c++ with MFC on VS2005. I was wondering how you can make your application draw outside its own window.

There are softwares out there that allow a user to scribble anything on the computer screen over any applications that are running or the desktop. A couple of them are
ActivePen (http://www.kongda.com/products/activepen/default.asp),
VBDoodle (http://www.hopkinsprogramming.net/software/vbdoodle/gallery/)
Draw-On-Screen (http://downloads.zdnet.com/abstract.aspx?docid=352162)

My question is how would I replicate this behavior? Im new to visual c++, and although i have experimented with making my own version of paint, I was only able to draw inside the screen of my MFC application which was made using Edit view class as base class. Did not see any way to draw just anywhere on the screen outside the window.

It would be great if you could maybe name a few built in classes/methods that can do this, or provide me with a link to a known resource on this topic. Thank you.

Re: Draw on screen outside application window

Naveen23-Jun-08 23:43

Naveen

23-Jun-08 23:43

If you are using MFC, you can use CWindowDC dc(0); to get a device conext to entire screen. Other wise use GetDC(0) to get the dc to entire screen.

Any drawing to the above dc's will come in screen at the specified locations.

nave

[OpenedFileFinder]

Re: Draw on screen outside application window

_AnsHUMAN_ 24-Jun-08 0:04

_AnsHUMAN_

24-Jun-08 0:04

On similar lines as the answer you received above you can get a dc for the desktop window HWND. The desktop window hwnd can be obtained by GetDesktopWindow API

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Draw on screen outside application window

Jijo.Raj24-Jun-08 1:22

Jijo.Raj

24-Jun-08 1:22

Such application are not drawing directly to desktop. They take snapshot of desktop and draw effects on it. So that on exit of you're application, you're desktop will be as clean as before.

Check this article - http://www.codeguru.com/cpp/g-m/multimedia/desktopeffects/article.php/c4719/[^]

Roll eyes | :rolleyes:

regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Draw on screen outside application window

garyofcourse24-Jun-08 3:54

garyofcourse

24-Jun-08 3:54

Thanks a lot jijo. The article you have linked me to is just what i needed.

Re: Draw on screen outside application window

Jijo.Raj24-Jun-08 7:45

Jijo.Raj

24-Jun-08 7:45

garyofcourse wrote:
Thanks a lot jijo.

Always Welcome! Wink | ;)

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Socket Ping vs Connect Performance

od@ananzi.co.za23-Jun-08 23:16

od@ananzi.co.za

23-Jun-08 23:16

Hi All,

We have quite about 30 clients connecting to about 200 servers on our WAN. Currently we are experiencing extremely slow connection establishment times, in the order of 15-20 seconds. However, a ping from a client to the same server responds in 1-2 seconds.

The client and server applications are based on WSASocket.

I have traced the client and server side applications to death and it seams that the delay is in the receiving of the FD_ACCEPT event. Once the event has been received and the connections established, all seems fine, but it takes an unusually long time for the event to be received (through WSAEnumNetworkEvents).

Are there any reasons for the connection establishment to take SOOOO long, while a ping goes through quite quickly ?

Thanks
OD

Re: Socket Ping vs Connect Performance

Moak6-Jul-08 4:51

Moak

6-Jul-08 4:51

Sounds strange, maybe your routers do some traffic shaping or you hit a bottleneck in your network infrastructure. I would try to send more dummy data with the connection handshake (to see if that has a negative or positive impact), plus try another listening port number.

/M

My Webchat in Europe Java | [Coffee]

file association question in MDI , about dde

followait23-Jun-08 22:56

followait

23-Jun-08 22:56

I can't start the MDI application by dbclick a data file.
It reports that the file can't be found, and crashes.
I check the registry, and found:

open
 |
 |---command
 |   Default d:\myapp.exe /dde
 |---ddeexec
     Default [open("%1")]

I tried to change it as below:

open
 |
 |---command
     Default d:\myapp.exe "%1"

the problem is solved, but when I open a data file the second time, the registry is restored automatically.

What's dde? How to make it correct?

About CreateProcessAsUser

hanlei000000000923-Jun-08 22:13

hanlei0000000009

23-Jun-08 22:13

HANDLE   hToken;  

	if(!GetTokenByName(hToken,"EXPLORER.EXE"))   
	{   
		return   FALSE;   
	}   

	STARTUPINFO   si;   
	PROCESS_INFORMATION   pi;   

	ZeroMemory(&si,   sizeof(STARTUPINFO));   
	si.cb=   sizeof(STARTUPINFO);   
	si.lpDesktop   =   TEXT("winsta0\\default");   


	BOOL   bResult   =   CreateProcessAsUser(hToken,"D:\\1.bat",NULL,NULL,NULL,   FALSE,NORMAL_PRIORITY_CLASS,NULL,lpCurrentDir,&si,&pi);

I use CreateProcessAsUser run 1.bat attach a database to sql server 2000.

1.bat:

OSQL -E -Q "sp_attach_db @dbname = 'YDJC2', @filename1 = '%CD%\database 08-6-5\YDJC2_Data.MDF', @filename2 = '%CD%\database 08-6-5\YDJC2_Log.LDF'"

But, this database is read only attribute in sql server 2000, why?

I double click mouse button to run 1.bat is OK, database is read/write attribute in sql server 2000.

How to use CreateProcessAsUser to solve this problem?

MFC DLL

bhanu_850923-Jun-08 21:14

bhanu_8509

23-Jun-08 21:14

Dear All,

I want to develop an application in VC++ as dll. Please tell me whether it is possible to access the dll from a C# GUI application. For example, I have 5 dll for five different application. In the C# GUI I have 5 buttons, clicking the button has to launch the application (dll) accordingly.

I dont know how to develop this kind of application and also dont know whether this is possible or not.

Re: MFC DLL

Cedric Moonen23-Jun-08 21:20

Cedric Moonen

23-Jun-08 21:20

bhanu_8509 wrote:
For example, I have 5 dll for five different application. In the C# GUI I have 5 buttons, clicking the button has to launch the application (dll) accordingly.

A dll is not an executable, so you can't "execute" a dll. Why don't you simply make 5 executables that you can start from C# ? I don't really understand why you want to use dll's. Or I misunderstood your question, and then some more information would be useful.

Cédric Moonen
Software developer

Charting control [v1.4]

Re: MFC DLL

bhanu_850923-Jun-08 23:13

bhanu_8509

23-Jun-08 23:13

Please kindly refer my reply.

Re: MFC DLL

Hamid_RT23-Jun-08 21:24

Hamid_RT

23-Jun-08 21:24

Do you wan to make your dlls on the c++ and use of them on the C#? yes

Re: MFC DLL

theCPkid23-Jun-08 22:26

theCPkid

23-Jun-08 22:26

>>For example, I have 5 dll for five different application?
What kind of applications are these??

You can export functions from a dll and then on every button click, you can call any function inside any dll. So, it is possible for you to make five dll and make each dlls export 1 function which you will call depending on which button is clicked.

the fruits of your success will be in direct ratio to the honesty and sincerity of your own efforts in keeping your own records, doing your own thinking and, reaching your own conclusions.
..surviving in autumn..in love with spring..

Re: MFC DLL [modified]

bhanu_850923-Jun-08 23:12

bhanu_8509

23-Jun-08 23:12

My application is for MPEG2 Transport Stream Analysis and Decoding of MPEG streams. I am developing this applications in vc++.

theCPkid wrote:
You can export functions from a dll and then on every button click, you can call any function inside any dll. So, it is possible for you to make five dll and make each dlls export 1 function which you will call depending on which button is clicked.

My dll has many functions with it, for example, I will develop the decoder as one dll. Please tell me is it possible to call the dll from the c# GUI application. Does it takes more memory during the init of the c# application ? Can we control all the functions in the dll from the c# app ?

Also advice whether to develop the decoder app as a executable and then call the exe from the c# app. Will this takes more memory while loading ?

Please kindly advice how to proceed (whether to use dll or exe).

Thank you very much. Expecting your kind reply

modified on Tuesday, June 24, 2008 7:18 AM

Re: MFC DLL

bhanu_850924-Jun-08 1:54

bhanu_8509

24-Jun-08 1:54

Can anyone help me for the above ?

Kindly,
Gaja

Re: MFC DLL

theCPkid24-Jun-08 2:19

theCPkid

24-Jun-08 2:19

DLLs are more efficient when it comes to memory usage.
See this link:
http://msdn.microsoft.com/en-us/library/dtba4t8b(VS.80).aspx

Your dll can export as many functions as it wants.
What do you mean by controlling a function? You call the function inside you dll and it will accept some input, transport stream, and gives back audio/video stream as output.

By the way, it does not matter right now whether you work on dll or exe as the decoding logic will remain same. So, you can start working on it till you get a better idea of it.

Good Luck.

Re: MFC DLL

bhanu_850925-Jun-08 1:53

bhanu_8509

25-Jun-08 1:53

Thank you very much for your reply. I have finished developing the application as MFC. Now I have MFC executable. But now I need to design a single GUI to control all the functions.

I dont develop the application as dll as of now it is available only as MFC executable. I also go through the VC++ windows application forms and found it is better for designing GUI.

Now my question is that, "Is it possible to migrate the VC++ MFC code into Windows application form". It will be very easy for me, if the above one is possible.

Please guide me. (I am only having little knowledge in Windows application forms. If I am not explaining you correctly means, please advice.)

Many thanks in advance.

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