C / C++ / MFC

4-Mar-01 5:21

<<< In the name of GOD >>>
Hi all.
Please explain to me about this pointer,
I read MSDN help, but i didn't understand.
Please help me ...
Confused | :confused:

Hadi Rezaie

l a u r e n4-Mar-01 6:19

4-Mar-01 6:19

its a pointer to the current object that is used for all sorts of hidden and some overt things ... its kinda fundamental to the c++ language

for instance, in a dialog class you could set the window title by calling either:

SetWindowText(blah blah blah)

or

this->SetWindowText(blah blah blah)

it mostly gets passed as a hidden parameter in various calls between objects and can be used as a return value if you want to pass the address of the current object to another object

hmmmmmm ... is actually a very deep subject if you examine the full uses of it

Suspicious | :suss:

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"every year we invent better idiot proof systems and every year they invent better idiots"

Hadi Rezaee4-Mar-01 18:20

4-Mar-01 18:20

Good,
Now, What mean ::SetWindowText ???

Hadi Rezaie

l a u r e n4-Mar-01 20:17

4-Mar-01 20:17

you're kidding right?

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"every year we invent better idiot proof systems and every year they invent better idiots"

markkuk4-Mar-01 22:24

markkuk

4-Mar-01 22:24

It means calling the global function SetWindowText() instead of a member function of the current class.

Erik Funkenbusch5-Mar-01 9:25

Erik Funkenbusch

5-Mar-01 9:25

This is really a basic question that any C++ book would cover in the first or second chapter.

While I have no problem helping people learn, I think that you should at least meet me halfway and have at least read some basic material covering C++.

Any decent book can do a much better job of teaching you the basics than we can in a few sentances on a board.

Status Bar ...

Hadi Rezaee3-Mar-01 18:12

3-Mar-01 18:12

<<< In the name of GOD >>>
Hi,
I want to use Status Bar in my Dialog.
So, please write all code by CStatusBar class
for use StatusBar in dialog.
Thanks.
Smile | :)

Hadi Rezaie

Wolfram Steinke3-Mar-01 19:11

Wolfram Steinke

3-Mar-01 19:11

Have a look at
http://codeguru.earthweb.com/dialog/toolbars.shtml

Happy programming!!

Hadi Rezaee4-Mar-01 5:16

4-Mar-01 5:16

Thanks for reply.
That is useful reply.
I have other question,
Now i want to indicate status about NUM, CAPS, ...
Please help me ...
Big Grin | :-D

Hadi Rezaie

Wolfram Steinke4-Mar-01 10:18

Wolfram Steinke

4-Mar-01 10:18

Ok here goes.
1. Add to dialog header
CStatusBar m_wndStatusBar;
2. Define indicators array as you would in MainFrame of and SDI or MDI application

static UINT indicators[] =
{
ID_SEPARATOR, // status line indicator
ID_INDICATOR_NUM,
ID_INDICATOR_CAPS,
};

3. Create the status bar in InitDialog

if (!m_wndStatusBar.Create(this) ||
!m_wndStatusBar.SetIndicators(indicators,
sizeof(indicators)/sizeof(UINT)))
{
TRACE0("Failed to create status bar\n");
return -1; // fail to create
}

4. Add OnKickIdle function and Message Map entry
Message Map
ON_MESSAGE_VOID(WM_KICKIDLE, OnKickIdle)

Header
afx_msg void OnKickIdle();

Function
void CMyDlg::OnKickIdle()
{
m_wndStatusBar.OnUpdateCmdUI(reinterpret_cast<cframewnd*>(this), FALSE); // must cast
}

5. And finally the Handler entries

Message Map
ON_UPDATE_COMMAND_UI(ID_INDICATOR_CAPS, OnUpdateKeyIndicator)

Header
afx_msg void OnUpdateKeyIndicator(CCmdUI* pCmdUI);

Function
void CLittleBlackBookDlg::OnUpdateKeyIndicator(CCmdUI* pCmdUI)
{
UINT nVK;
UINT flag = 0x0001;

switch (pCmdUI->m_nID)
{
case ID_INDICATOR_CAPS:
nVK = VK_CAPITAL;
break;

case ID_INDICATOR_NUM:
nVK = VK_NUMLOCK;
break;

default:
TRACE1("Warning: OnUpdateKeyIndicator - unknown indicator 0x%04X.\n",
pCmdUI->m_nID);
pCmdUI->ContinueRouting();
return; // not for us
}

pCmdUI->Enable(::GetKeyState(nVK) & flag);
// enable static text based on toggled key state
ASSERT(pCmdUI->m_bEnableChanged);
}

Similarly if you want a toolar.

Happy programming!!

Hadi Rezaee4-Mar-01 18:08

4-Mar-01 18:08

Ohhh, Yes.
Thanks a looooooooot.
Blush | :O

Hadi Rezaie

l a u r e n3-Mar-01 20:36

3-Mar-01 20:36

if its a non-resizable dialog box why dont you just plonk some statc controls along the bottom and fake the status bar?

---
"every year we invent better idiot proof systems and every year they invent better idiots"

and now a question...

l a u r e n3-Mar-01 10:46

3-Mar-01 10:46

i have most of my projects on my main development machine but occasionally transfer them to my laptop to work elsewhere or as a temp backup ... if i load a project on my laptop under the exact same version of vc++ (ent ed 6 sp4) it takes literally 20 minutes to process the files in the project explorer view ... on my main machine it takes a few seconds

both machines are p2 350's with 128Mb ram ... anybody have a clue why this is?

Confused | :confused:

---
"every year we invent better idiot proof systems and every year they invent better idiots"

C^hris L^osinger3-Mar-01 11:04

C^hris L^osinger

3-Mar-01 11:04

NT, 2K or 95/98 ?

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

l a u r e n3-Mar-01 11:15

3-Mar-01 11:15

ahhhh
the main machine is nt ws 4 sp6a ... laptop is w2k
what could be different as far as a vc project goes between os's?
duhhh

---
"every year we invent better idiot proof systems and every year they invent better idiots"

Tim Deveaux3-Mar-01 11:53

Tim Deveaux

3-Mar-01 11:53

I know this is kind of a non-answer, but I have the same setup - an nt4 box and w2k lt, and I haven't seen this problem.

Mostly i don't bother to network the laptop, so when I move a project its zipped on a floppy - one big one zipped just fits, but I have to delete the big fat .ncb and ususally the .opt, aps etc.

Does it make any difference if you don't move these over? I guess if it did, the problem would only occur on the first load... hmmm... the only other wild idea I have is to see if VC is doing something over the network - that could muddy things.

l a u r e n3-Mar-01 19:41

3-Mar-01 19:41

i deleted the .opt and .ncb files and it loads in under 30 seconds ... wonder why those files make things slower if they're included ... i would have thought they'd make things quicker as vc wouldn't have to create them from the source files again

thanks for the pointer Smile | :)

---
"every year we invent better idiot proof systems and every year they invent better idiots"

Tim Deveaux4-Mar-01 1:59

Tim Deveaux

4-Mar-01 1:59

Cool. I haven't yet figured out what all those files do - the NCB is a 'no compile browser' file - apparently used by class wiz and component gallery.

The OPT (options) file holds, according to the docs, all your workspace options - what build's on deck, where your toolbars are, etc. I find it also holds a lot of text from open files, (remove it and all the windows you left open last session are gone). Not sure if it has something to do with undo/redo in the editor, but just updating these screens as you type might be a chore. When I find the keyboard really sluggish after a long session, I take a look and see if the opt file is flirting with 70k. If so, it helps to delete it.

Just theories...

Erik Funkenbusch5-Mar-01 9:54

Erik Funkenbusch

5-Mar-01 9:54

These files can easily become corrupted, and when they do, VC acts in unpredictable ways. Some of those files contain machine specific information, and if the environment isn't exactly the same, it gets confused.

the .ncb is the no-compile browser, used for the ClassView primarily, but also for IntelliSense.

the .opt file stores local options, such as which windows you have have open, breakpoints, etc.. Not quite so intuitively, it also stores folder hierchy if you create new folders in your FileView (this should really be stored in the project IMO, but sadly that's not the way the IDE developers saw it).