C / C++ / MFC Discussion Boards

Never mind..

RobJones19-Feb-04 6:10

RobJones

19-Feb-04 6:10

Never mind, I figured it out.

Whoever said nothing's impossible never tried slamming a revolving door!

Database Design Question

Nitron19-Feb-04 3:38

Nitron

19-Feb-04 3:38

Ok, so I'm writing a multi-user database app. The downside is that I am interfacing with Access databases. Now it's not like hundreds of users, but maybe tens of users, so here is my design dilemma...

Should I:

A. Create a connection to the database and keep that connection open during the application lifetime.

B. Create a connection to the database, buffer the data, close the connection, and then only reconnect to commit changes.

C. Open and close the connection each time data is updated WITHOUT buffering the data.

D. Some other idea?

~Nitron.

ññòòïðïðB A start

Re: Database Design Question

RChin19-Feb-04 4:21

RChin

19-Feb-04 4:21

I guess the methods of keeping your "connetion pool" will differ, depending on your software circumstances.

I would never by default consider C., because it can eat up considerable amount of time each time you connect. But this may be necessary on a stateless Client/Server program.

Personnally, I tend to keep a db connection, disconnecting after a specified amount of inactivity, then reconnect when required.

I Dream of Absolute Zero

Re: Database Design Question

basementman19-Feb-04 8:05

basementman

19-Feb-04 8:05

The answer really depends upon the frequency that the user will hit the database. Remember, connecting to a database is very expensive, so if the users will be accessing the database more than every couple of minutes, it makes sense to connect and keep the connection open.

onwards and upwards...

time synchronisation

styve19-Feb-04 3:36

styve

19-Feb-04 3:36

I have some problem. I'm not sure how to do a program that synchronize the time for five computers.
One computer will be a Master and get the time with ntp. And then sent a signal to the other four computer for example every 10 second.

Is there someone that can help me get started and give me some hints how I should do?

/stefan

Re: time synchronisation

David Crow19-Feb-04 5:50

David Crow

19-Feb-04 5:50

Rather than implement a push design, why not go for a pull design? You could create a scheduled task on each of the computers that periodically started a .BAT file that contained the appropriate net time command.

A rich person is not the one who has the most, but the one that needs the least.

Make Edit Control un-editable

J.B.19-Feb-04 3:27

J.B.

19-Feb-04 3:27

Hi guys,

I have stumped through something that I think should be easy to do, but yet to make it work. Basically, I have a plan edit control (CEdit) which I want to make it un-editable, no text, space etc can be put it. The content will only be changeable by the app internally, using SetWindowText().

I can't make it Read-Only as it will grey out the content area, I still want the text inside the edit control selectable. Disabling the control greys out the whole box too. I had a thought to override OnKeyDown and OnKeyUp messages for this particular control but maybe I had them written wrong.

in the class declaration, .h file,
afx_msg void OnKeyDownEdit1();

in the .cpp file

BEGIN_MESSAGE_MAP(MyMainDlg, CDialog)<br />
ON_WM_KEYDOWN(IDC_EDIT1, OnKeyDownEdit1)<br />
END_MESSAGE_MAP()

void MyMainDlg::OnKeyDownEdit1<br />
{<br />
    // nothing to ignore all the keystrokes into the edit control<br />
}

It'd be great if someone could point me out where I did wrong here. Or if completely wrong, what shoudl I do instead.
Thanks alot

Re: Make Edit Control un-editable

Maximilien19-Feb-04 3:37

Maximilien

19-Feb-04 3:37

you need to derive your own edit class from CEdit , and in which you handle the keystrokes.

or if it's always a read-only control, maybe a CStatic derived class can be used.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Make Edit Control un-editable

dabs19-Feb-04 3:50

dabs

19-Feb-04 3:50

CEdit includes a SetReadOnly( )[^] function.

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

Re: Make Edit Control un-editable

David Crow19-Feb-04 5:54

David Crow

19-Feb-04 5:54

J.B. wrote:
I have stumped through something that I think should be easy to do, but yet to make it work. Basically, I have a plan edit control (CEdit) which I want to make it un-editable, no text, space etc can be put it. The content will only be changeable by the app internally, using SetWindowText().

Then why not just use a static control? It satisfies all of your requirements.

A rich person is not the one who has the most, but the one that needs the least.

Re: Make Edit Control un-editable

Prakash Nadar19-Feb-04 6:17

Prakash Nadar

19-Feb-04 6:17

Mr.Crow if you dont me mind saying that you shuold give a proper ans or nothing at all. Do you know that you cant have scrolling effect with the static control, Or horizontal scrolling with the static control. What if he just wants to display some long text that can only be viewed and not edited?? Did you consider this? or were you giving with some unwanted suggestion?

Any ways the solution to the problem is checking the Read-only in Styles of the edit box.

"When death smiles at you, only thing you can do is smile back at it" - Russel Crowe (Gladiator)

Re: Make Edit Control un-editable

David Crow19-Feb-04 6:46

David Crow

19-Feb-04 6:46

Goodness gracious, someone woke up on the wrong side of the bed this morning! Are you always so tact~~ful~~less on Thursdays?

Did you know that using the ES_READONLY style also has the side effect of graying the edit control? I suppose that's just as incorrect as my answer. Yes?

A rich person is not the one who has the most, but the one that needs the least.

Re: Make Edit Control un-editable

Steve S19-Feb-04 7:30

Steve S

19-Feb-04 7:30

Now, now, chaps. Let's have some decorum in here. Anyone would think you were all Java developers*

One possible solution is to use ES_READONLY, but handle the WM_CTLCOLORSTATIC message in the dialog, (or the reflection of it, in the control). The edit control sends this message, rather than WM_CTLCOLOREDIT, if it is either disabled, or read-only.

You could then return an appropriate HBRUSH value to change the grey/gray background accordingly.

Steve S
*Please, no flames about Java. I've just been told who my new line manager is, and he's an anti-MS pro-Java pro-linux man. Given that I work mainly in C++ using ATL on COM+ components, life is about to get more interesting, unless I find an alternative form of employment Big Grin | :-D

Re: Make Edit Control un-editable

Prakash Nadar19-Feb-04 14:07

Prakash Nadar

19-Feb-04 14:07

ok what ever you think.

"When death smiles at you, only thing you can do is smile back at it" - Russel Crowe (Gladiator)

Re: Make Edit Control un-editable

Ravi Bhavnani19-Feb-04 7:26

Ravi Bhavnani

19-Feb-04 7:26

I think you'll find it much easier to make the control read-only and handle the drawing of the edit control to make it look like it's a non-read-only control. Handle WM_CTLCOLORSTATIC and do something like this:

LRESULT CMyDlg::OnCtlColorStatic
  (WPARAM wParam, LPARAM lParam)
{
  // Override this method to impart a normal background to the edit
  // control
  HDC hDC = (HDC)wParam;
  HWND hwndCtl = (HWND) lParam;
  UINT uCtrlId = ::GetDlgCtrlID (hwndCtl);
  if (uCtrlId == IDC_MY_EDIT) {
      CDC *pDC = CDC::FromHandle (hDC);
      pDC->SetBkColor (RGB (255, 255, 255));
      return (LRESULT) (HBRUSH) m_brushBkg.GetSafeHandle();
  }
  return Default();
}

Of course, you should use GetSysColor() instead of the hardcoded constant RGB (255,255,255). You'll also need to create/destroy the background CBrush within your dialog.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Re: Make Edit Control un-editable

J.B.19-Feb-04 15:38

J.B.

19-Feb-04 15:38

Thanks Ravi, and the other guys who have posted to help,
really appreciate it.

Ravi's suggested method seems to work for my needs for now. In addition to the original codes, I also have to re-initialise the brush. Without doing that, the area that is outside the text rectangle area (depends on the font size that is set) will be all in black.

LRESULT MyDlg::OnCtlColorStatic(WPARAM wParam, LPARAM lParam)
{
    // Override this method to impart a normal background to the edit
    // control
    HDC hDC = (HDC)wParam;
    HWND hwndCtl = (HWND) lParam;
    UINT uCtrlId = ::GetDlgCtrlID (hwndCtl);

    // Delete the old brush
    m_brushBkg.DeleteObject();
    // Create a new brush in the specified color (white)
    m_brushBkg.CreateSolidBrush(RGB (255, 255, 255));

    if (uCtrlId == IDC_LABEL_DISPLAY) {
    CDC *pDC = CDC::FromHandle (hDC);
    pDC->SetBkColor (RGB (255, 255, 255));
        return (LRESULT) (HBRUSH) m_brushBkg.GetSafeHandle();
    }
    return Default();
}

Re: Make Edit Control un-editable

Ravi Bhavnani20-Feb-04 4:09

Ravi Bhavnani

20-Feb-04 4:09

I think you're better off creating/deleting m_brushBkg just once (outside the handler). That would be more efficient.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Re: Make Edit Control un-editable

J.B.20-Feb-04 5:12

J.B.

20-Feb-04 5:12

Thank you Ravi,

for this further suggestion.

Cheers

How do I create AVI animation from series of BMPs?

johannks19-Feb-04 3:23

johannks

19-Feb-04 3:23

Hello

I want to create a small and simple AVI animation to be used by the CAnimateCtrl in a dialog. I have created the series of bitmaps that I want to use, but I can't find a small and simple tool (preferrably free since this is a one time problem) that does the job.

Since the dawn of DivX the web is bloated with information on AVIs that is useless for this simple job, and all the old postings I have found is from the mid-90's and I can't find the tools.

I have tried the CAVI32 program, but it changes the pink background to white, which makes all my whites transparent (with the effect ov having gray papers floating through the air).

Does anybody have a suggestion?

Re: How do I create AVI animation from series of BMPs?

Admiral Quality19-Feb-04 11:15

Admiral Quality

19-Feb-04 11:15

If you're using XP there's the included "Windows Movie Maker" which seems to let me put BMPs into the video timeline. Tried that?

Soundcards - advanced interfaces

peterchen19-Feb-04 3:14

peterchen

19-Feb-04 3:14

The standard interfaces for soundcards (waveIO, DirectSound) only offer limited functionality (e.g. enumerating capabilities - sampling frequencies only enumerated up to 44k, or enabling the digital loopback that most cards offer)

Are there any other general/quasi-standard API's, or stuff for individual soundcards? Am I missing any?

Peter

Flirt harder, I'm a Coder

mlog || Agile Programming | doxygen

Re: Soundcards - advanced interfaces

Prakash Nadar19-Feb-04 5:18

Prakash Nadar

19-Feb-04 5:18

Well if you want to further down then i guess Createfile, writefile, and apis related to that is ur answer, For this i believe you need to know the specification of the Sound card that you intend to program.

Regards.

"When death smiles at you, only thing you can do is smile back at it" - Russel Crowe (Gladiator)

Overriding HyperLink in CHtmlEditCtrl

panzerdivisionmarkus19-Feb-04 2:43

panzerdivisionmarkus

19-Feb-04 2:43

Hi.
I'm having some troble overriding the HyperLink function in CHtmlEditCtrl.

In what format am I supposed to have my URL that I send into the Hyperlink function?
I've tried with http://www.bla.com
and some variations but it won't accept them, and I don't want to use the auto dialog for adding a link, I wan't to make my own. But then I have to know how to format the LPCTSTR correct.

Anyone who can help me?

Thanks in advance...

/Markus

Executing an exe file without using shell commands like execv or ShellExecute etc

Member 48989819-Feb-04 1:05

Member 489898

19-Feb-04 1:05

I have developing over microsoft platform from the past 3 years. I am quiet a bit stucked in a task, which I would like to discusss with you.

Problem:

1)Read any .exe created on the microsoft platform using File IO operation
2)Store in in a buffer
3)Execute it from the bufffer
4) We donot have the option of writing this buffer to a file and then
execute it. The requirement is to run the executable in the buffer. i.e we cannot use shell commands like ShellExecute, Execv etc.

How do we go about it...? ) It appears to me that asking this question is like runnign a program
for which you may not have the valid permissions or for which you dont
want to leave any trace in the system logs about the file creation. but .. thats just my guess

Hope to see reply soon from forum people

Sincerest Regard's

Imran A. Baset

Imran A. Baset

Re: Executing an exe file without using shell commands like execv or ShellExecute etc

David Crow19-Feb-04 3:02

David Crow

19-Feb-04 3:02

Imran Abdul Baset wrote:
How do we go about it...?

You can't.

If the data already exists as a file, why bother reading it into a buffer? It's an EXE, so run it!

A rich person is not the one who has the most, but the one that needs the least.

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