C / C++ / MFC Discussion Boards

Re: How to get a dynamic created control's dc

paraGOD13-Nov-05 16:25

paraGOD

13-Nov-05 16:25

Thank u , but this method can't draw the text in the edit contol.

Re: How to get a dynamic created control's dc

jhwurmbach13-Nov-05 21:58

jhwurmbach

13-Nov-05 21:58

paraGOD wrote:
Thank u , but this method can't draw the text in the edit contol.

SetWindowText() *can* draw the text in the edit-ctrl.
In fact, its the only way to do it this side from owner-drawing the whole control.

Your way paints the text at the exact place where the Edit-ctrl is located, triggering the edit-ctrls redraw.
Your text gets overwritten.
If what you want to acomplish is putting your Text into the Edit-ctrl, then SetWindowText() is the way to tell the Edit-ctrl what text it has to draw.
If you want something different, you should subclass CEdit and do it yourself, possibly delegating routine tasks to your baseclass CEdit.

"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."

-- Caius Petronius, Roman Consul, 66 A.D.

Bad Loop help please

B.F.13-Nov-05 1:51

B.F.

13-Nov-05 1:51

Hi, I was trying to make a dice app in VC++ 98 for me and my friends to play DnD.
I want the ability to throw the same dice multiple times on a push of the button.
This is what I have come up with:

<br />
void CZmurfDICEDlg::OnD20() <br />
{<br />
 int ret;<br />
 for(int k=0; k < m_E20; k++) //edit box, integer, where I want to set the # of throws<br />
  {<br />
	UpdateData(TRUE);<br />
	m_strET=""; //edit box that get each value at a turn (visible-false)<br />
	srand((unsigned)clock());<br />
	ret=rand()%20+1;<br />
	m_strET.Format("%d  ",ret);<br />
	m_strMessage=m_strMessage+m_strET; //edit box ,the dice throw result can be seen<br />
  }<br />
 UpdateData(FALSE);<br />
}<br />

If I set 20 into m_E20 and push the button for D20, I only get one result, not 20 as I want to.
Any help is more that welcomed
Thanks, Bogdan

Re: Bad Loop help please

Gary R. Wheeler13-Nov-05 1:55

Gary R. Wheeler

13-Nov-05 1:55

You're appending the m_strET value to m_strMessage. Is this the member variable displayed in the dialog, or is it m_strET? If it's the latter, that would explain why you only see one value.

Software Zen: delete this;

Re: Bad Loop help please

B.F.13-Nov-05 2:17

B.F.

13-Nov-05 2:17

m_strMessage is the editbox that the user can see. m_strET is not visible, I use it as a temp.
I have found out by updating m_E20, so I can see what happens, and adding this to the code right bedore the "}" of my for: m_E20--;
I set the value in m_E20 to 10, as to have 10 throws, but when I push the button the value in m_E20 becomes 9; so it throws the dice only 1 time, not 10 times Frown | :(

Thanks, BF

Re: Bad Loop help please

Gary R. Wheeler13-Nov-05 2:44

Gary R. Wheeler

13-Nov-05 2:44

I think I've figured it out. Here's your original code:

void CZmurfDICEDlg::OnD20() 
{
  int ret;
  for(int k=0; k < m_E20; k++) //edit box, integer, where I want to set the # of throws
  {
    UpdateData(TRUE);
    m_strET=""; //edit box that get each value at a turn (visible-false)
    srand((unsigned)clock());
    ret=rand()%20+1;
    m_strET.Format("%d ",ret);
    m_strMessage=m_strMessage+m_strET; //edit box ,the dice throw result can be seen
  }
  UpdateData(FALSE);
}

Calling UpdateData(TRUE) inside the loop resets all of the member values to whatever is on the screen, which clears out what you've been calculating in the loop. Also, you don't need to seed the random number generator each iteration of the loop. Try this instead:

void CZmurfDICEDlg::OnD20() 
{
  int ret;
  UpdateData(TRUE);
  srand((unsigned)clock());
  m_strMessage="";
  for(int k=0; k < m_E20; k++) //edit box, integer, where I want to set the # of throws
  {
    m_strET=""; //edit box that get each value at a turn (visible-false)
    ret=rand()%20+1;
    m_strET.Format("%d ",ret);
    m_strMessage=m_strMessage+m_strET; //edit box ,the dice throw result can be seen
  }
  UpdateData(FALSE);
}

Using this logic, m_strET will display the last value calculated, and m_strMessage should display the list.

Software Zen: delete this;

Re: Bad Loop help please (side note)

Gary R. Wheeler13-Nov-05 2:47

Gary R. Wheeler

13-Nov-05 2:47

Just as a side note: When you are posting more than one line of code, you can use the <pre>...</pre> tags to format it. It makes the code a lot easier to read. I think that's why I didn't notice the UpdateData(TRUE) call inside the loop before.

Software Zen: delete this;

Re: Bad Loop help please (side note)

B.F.13-Nov-05 4:37

B.F.

13-Nov-05 4:37

Thanks a lot, that was it Smile | :)

Cheers, BF

Re: Bad Loop help please

lklf13-Nov-05 16:51

lklf

13-Nov-05 16:51

Test

Test

Re: Bad Loop help please

chamilkab13-Nov-05 18:00

chamilkab

13-Nov-05 18:00

You have to move the statement UpdateData(TRUE); outside the for loop. The value of the variable m_E20 is not updated when you come to the for loop. So the loop does not get executed.

So the correct way is

UpdateData(TRUE); //This will read the value in the edit box into m_E20<br />
for(int k=0; k < m_E20; k++) //edit box, integer, where I want to set the # of throws<br />
{<br />
m_strET=""; //edit box that get each value at a turn (visible-false)<br />
-----<br />
}<br />
UpdateData(FALSE);

problems with ST_SplitterWnd and CFrameWnd

#937013-Nov-05 1:34

#9370

13-Nov-05 1:34

Hi,

I want to use ST_SplitterWnd (http://www.codeproject.com/splitter/st_splitterwnd.asp). The right pane should be a CFrameWnd with a DialogBar and some views. Attached to the Dialog Bar is a CTabCtrl for switching between the views in the CFrameWnd. The problem now is, that a small part of one of the views is visible within the first view at the left upper corner.
When showing the other views (by clicking at the appropriate tab) and then going to the first view again, the problem is gone.
When I use a standard CSplitterWnd I don't have this effect.

What's wrong?

Thank's
#9370

-- modified at 7:41 Sunday 13th November, 2005

Re: problems with ST_SplitterWnd and CFrameWnd

Gary R. Wheeler13-Nov-05 2:01

Gary R. Wheeler

13-Nov-05 2:01

Off-hand, it sounds like an initial background painting problem.

You would probably be better off posting a message in the article's forum, since it sounds like a problem related to the article code.

Software Zen: delete this;

Re: problems with ST_SplitterWnd and CFrameWnd

#937013-Nov-05 4:18

#9370

13-Nov-05 4:18

Hi Gary,

thank you for your reply but I already tried it in the article's forum - I got no answer yet.

#9370

OPC XML DA Client - Managed C++ Implementation

exetera13-Nov-05 0:38

exetera

13-Nov-05 0:38

Hi!!!
I'm an italian studentand I'm implementing an OPC XML DA Client using managed C++.

In the Write primitive, for each item I have to set the ItemValue as an istance of the Object class, like the OPC specification requires.

By Client interface I obtain a String. I have tried to obtain an Object by casting, but the response of the OPCserver was "E_BADTYPE", cause the OPCServer see a String*, not an Object*.

What can I do to obtain an Object (acceptable by OPCServer) from a String?

Maybe this is a stupid question, but I'm a beginner in the OPC World.

Thanks a lot.

Ninni Crisafi

Double Buffering

Akilez12-Nov-05 22:17

Akilez

12-Nov-05 22:17

I am new to using Bitmaps in my programs... As tutorial/practice I want to create a simple game, the graphics of which will be supplied by bitmaps, however loading and blitting the individual bitmaps to the window DC provides much flicker. I realize I need to implement some double buffering strategy, however, I am, as yet unable to do so.

The way I see it:

1. Create two compatible DCs. (intermediate and final)
2. Load and select the individual bitmaps to the intermediate DC.
3. BitBlt() then ecah to their proper position in the "final" DC
4. Load and select the "final" bitmap (the final DC) into the window DC
5. BitBlt() this resultant image to the screen.

I am assuming there is something I do not understand about the process, or step four above, specifically. I am unsure what.

The code:
BITMAP bm;
PAINTSTRUCT ps;

HDC hdc = BeginPaint(hwnd, &ps);
HBITMAP hbmOld;
HDC hdcMem = CreateCompatibleDC(hdc);
HDC hdcFinal = CreateCompatibleDC(hdcMem);
int loopX, loopY;
for (loopX = 0; loopX < 20; loopX++) {
for (loopY =0; loopY < 20; loopY++) {

hbmOld = (HBITMAP)SelectObject(hdcMem, LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(map.getMap(loopX, loopY))));

GetObject(LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(map.getMap(loopX, loopY))), sizeof(bm), &bm);

BitBlt(hdcFinal, loopX * 32, loopY * 32, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
}
}
hbmOld = (HBITMAP)SelectObject(hdcFinal, CreateCompatibleBitmap(hdcMem, 640, 640));
GetObject(CreateCompatibleBitmap(hdcMem, 640, 640), sizeof(bm), &bm);

BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcFinal, 0, 0, SRCCOPY);

SelectObject(hdcFinal, hbmOld);
SelectObject(hdcMem, hbmOld);

ReleaseDC(hwnd, hdcFinal);
ReleaseDC(hwnd, hdcMem);

EndPaint(hwnd, &ps);

Re: Double Buffering

Jack Puppy13-Nov-05 1:37

Jack Puppy

13-Nov-05 1:37

Here's an old example that talks about eliminating flicker:

Flicker-Free Displays Using an Off-Screen DC

I would just try to get a flicker free example working using a simple color fill first. (use FillRect) Once you've got that down, replace the FillRect code with the code that draws your bitmaps.

"When you know you're going to eat crow, it's best to eat it while it's still warm." - Reader's Digest

Re: Double Buffering

Michael Dunn13-Nov-05 12:31

Michael Dunn

13-Nov-05 12:31

Akilez wrote:
HDC hdcFinal = CreateCompatibleDC(hdcMem);

Change hdcMem to hdc there - both mem DCs have to be compatible with the DC that's connected to the screen.

--Mike--
Visual C++ MVP Cool | :cool:

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How to use _inp and _outp in VC++

vikas amin12-Nov-05 21:43

vikas amin

12-Nov-05 21:43

I want to access the basic port by using this
simple functions _inp and _outp which are used
in the TurboC compilers or say compilers for DOS.

In windows i tried to use them in my MFC programe
but there are Runtime errrors stating Unprivilaged
instruction .
I also tried to use the assmebly code for the same
but the same error is disaplayed .

can anyone suggest me any other option for this

thankin you
vikas

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Re: How to use _inp and _outp in VC++

Gary R. Wheeler13-Nov-05 2:17

Gary R. Wheeler

13-Nov-05 2:17

I am afraid you are out of luck in the Windows world. Input and output instructions are privileged, which means that only device drivers are allowed to use them. The purpose of this is to protect system integrity and to let the operating system arbitrate access to the hardware, which is considered a shared resource.

If you are trying to control a specific piece of hardware, you should contact the manufacturer to see if they provide a Windows driver and interface software that you can use.

Software Zen: delete this;

Re: How to use _inp and _outp in VC++

douglasjordan13-Nov-05 15:32

douglasjordan

13-Nov-05 15:32

You will need to create a miniport driver (.sys) that can map that memory and access that I/O. After that you can create a macro that uses the inp/outp syntax to call the miniport. See MSDN for more info on miniports.

Re: How to use _inp and _outp in VC++

ThatsAlok13-Nov-05 17:32

ThatsAlok

13-Nov-05 17:32

vikas amin wrote:
I want to access the basic port by using this
simple functions _inp and _outp which are used
in the TurboC compilers or say compilers for DOS.

What about simple Api like ReadFile and WriteFile

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: How to use _inp and _outp in VC++

normanS13-Nov-05 19:07

normanS

13-Nov-05 19:07

I have used the IO library you can find at http://www.logix4u.net/inpout32.htm[^]

This allows your code to run on Windows 9x or XP. Works nicely!

As I recall, the documentation is a bit poor, for example, it is not clear that the input and output calls are 8-bit. (This may have been fixed by now.)

How to manage the code in VC++

vikas amin12-Nov-05 19:12

vikas amin

12-Nov-05 19:12