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...