C / C++ / MFC

Re: /Change the CEdit caret

9-Sep-02 1:17

Whether it is possible to change the caret in CEdit with a vertical line to another (for example: blinking or solid rectangle). If yes then how?

Best regards,

Best regards,
Eugene Pustovoyt

Tomasz Sowinski9-Sep-02 1:24

9-Sep-02 1:24

Check ::CreateCaret or CWnd::CreateCaret.

Tomasz Sowinski -- http://www.shooltz.com

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Eugene Pustovoyt9-Sep-02 1:29

9-Sep-02 1:29

Yes, but after first click into the CEdit, the caret stands to vertical line again.

Best regards,
Eugene Pustovoyt

Tomasz Sowinski9-Sep-02 1:41

9-Sep-02 1:41

Eugene Pustovoyt wrote:
after first click into the CEdit, the caret stands to vertical line again

You probably have to handle WM_SETFOCUS - call default implementation first and set your own caret next.

Tomasz Sowinski -- http://www.shooltz.com

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Eugene Pustovoyt9-Sep-02 1:58

9-Sep-02 1:58

I should not call CEdit::SetFocus() in OnSetFocus()?

There is one more question, various symbols have different width. As to me to adjust width of the caret for any symbol.

Best regards,
Eugene Pustovoyt

Tomasz Sowinski9-Sep-02 2:01

9-Sep-02 2:01

Eugene Pustovoyt wrote:
I should not call CEdit::SetFocus() in OnSetFocus()?

You should, but *before* setting your caret.

Eugene Pustovoyt wrote:
There is one more question, various symbols have different width

You'd probably have to monitor keyboard activity and create new caret whenever it moves to new symbol. Not easy task, IMHO.

Tomasz Sowinski -- http://www.shooltz.com

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Eugene Pustovoyt9-Sep-02 2:14

Memory Leaks in IMPLEMENT_DYNCREATE?!?!?!?

9-Sep-02 2:14

Probably, except for pressing the keyboard it is necessary to control the clicks of the mouse. Yes a task not easy.
I shall try, time is not present a way easier, it to realize.

Many thanks for the numerous help to me, including this.

Best regards,
Eugene Pustovoyt

Jawache9-Sep-02 1:12

9-Sep-02 1:12

I seem to have started to generate memory leaks,

really frustrating ones. I think something very strange is going on.

For Example:
in my Splitter class i declare a sub splitter,

m_pwndSplitter = new CJEXSplitter;

it says this is the source of the memory leak but i definately delete it in the destructor:

CJEXSplitter::~CJEXSplitter()<br />
{<br />
	// Get Window Sizes and Store in Registry<br />
	int iTemp = 0;<br />
	GetColumnInfo(0,m_szFromLeft,iTemp);<br />
	m_pwndSplitter->GetRowInfo(0,m_szFromTop,iTemp);<br />
	CWinApp * pApp = AfxGetApp();<br />
	pApp->WriteProfileInt(_T("SPLITTER"),_T("FROMLEFT"),m_szFromLeft);<br />
	pApp->WriteProfileInt(_T("SPLITTER"),_T("FROMTOP"),m_szFromTop);<br />
<br />
<br />
<br />
	if (m_pwndSplitter) <br />
		delete m_pwndSplitter;<br />
<br />
}

but then it starts saying i have other memory leaks in places I haven't touched like
in my CMainFrame class at
IMPLEMENT_DYNCREATE(CMainFrame, CUIMainFrame)
and in my document class
IMPLEMENT_DYNCREATE(CExplorerDoc, CDocument)

the killer for me is that it says theres a memory leak here to:-

pDocTemplate = new CSingleDocTemplate(<br />
    IDR_MAINFRAME,<br />
    RUNTIME_CLASS(CExplorerDoc),<br />
    RUNTIME_CLASS(CMainFrame),       // main SDI frame window<br />
    RUNTIME_CLASS(CExplorerView));

whats going on have i gone mad?!?

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 1:25

9-Sep-02 1:25

Looks like your program is terminated prematurely. Can you put the breakpoint in CYourApp destructor and check if it's actually executed?

Tomasz Sowinski -- http://www.shooltz.com

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Jawache9-Sep-02 1:39

9-Sep-02 1:39

I did check on all the ones i declared myself that and it yes they are called. Confused | :confused:

Does IMPLEMENT_DYNACREATE declare some memory aswell, if so where is it deleted?

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 1:46

9-Sep-02 1:46

Jawache wrote:
Does IMPLEMENT_DYNACREATE declare some memory aswell, if so where is it deleted?

Not really. IMPLEMENT_DYNCREATE provides the functionality of IMPLEMENT_DYNAMIC (MFC's own, primitive form of RTTI) and adds trivial implementation of virtual function CreateObject.

CreateObject is used by the framework to create documents/views/frames. If you see leaks originating in CYourObj::CreateObject, then something is wrong with app cleanup. Or - maybe you're playing tricks with doc/view architecture.

Tomasz Sowinski -- http://www.shooltz.com

** Putt knot yore thrust inn spel chequers. **

Jawache9-Sep-02 2:09

9-Sep-02 2:09

I've managed to find and put a breakpoint in CDocManager::~CDocManager()

and it isn't called!!!!

I've also just noticed in the debug window:-

ASSERT_VALID fails with NULL pointer. <- HUH??
The thread 0x46C has exited with code 3 (0x3). <-- Hmmm...
Detected memory leaks!

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 2:11

9-Sep-02 2:11

Go one level up and put the bkpt in CWinApp::~CWinApp.

Tomasz Sowinski -- http://www.shooltz.com

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Roger Allen9-Sep-02 1:49

Roger Allen

9-Sep-02 1:49

Are you using serialization on some of these objects? If you are then you can get memory leaks by using serialization with pointers like this.

CMyObject *pObject = new CMyObject ;

archive >> pMyObject ; // leak! as CObject create a new object losing the earlier allocated object.
This can be seen in the debugger by stepping over the seriazation line and seeing that the pMyObject pointer value changes.

Roger Allen
Sonork 100.10016

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Jawache9-Sep-02 1:56

9-Sep-02 1:56

Nope, nothing.

Unless the Document or WinApp performs serialization by itself, but i would imagine I would have noticed the memory leaks earlier.

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Pavel Klocek9-Sep-02 1:52

Pavel Klocek

9-Sep-02 1:52

You are not using global instances of MFC classes?
Global instances destructors are called after reporting memory leaks.

Pavel
Sonork 100.15206

Jawache9-Sep-02 1:59

9-Sep-02 1:59

Nope,

I'm using a number of singleton classes but they aren't the ones with the memory leaks and anyway i use static variables for the instances not pointers.

Whats really confusing me is that VC is saying i have a memory leak in my App::InitInstance where I register the document templates,

pDocTemplate = new CSingleDocTemplate( there is no way that should be the cause of a memory leak because that is part of the framework.

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 2:07

9-Sep-02 2:07

Document template is deleted by CDocManager destructor. CDocManager is an internal MFC class. Can you put breakpoint in CWinApp::~CWinApp - it's appcore.cpp file in mfc\src, at least in VC6. You should see the following code:

if (m_pDocManager != NULL)
	delete m_pDocManager;

Maybe for some reason m_pDocManager is NULL?

Tomasz Sowinski -- http://www.shooltz.com

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Jawache9-Sep-02 2:13

9-Sep-02 2:13

It is called and m_pDocManager is NULL !

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 2:19

9-Sep-02 2:19

Can you check m_pDocManager at the end of CYourApp::InitInstance?

Tomasz Sowinski -- http://www.shooltz.com

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Jawache9-Sep-02 2:22

9-Sep-02 2:22

Yup,

Its declared in AddDocTemplate

and its still NOT null by the end of InitInstance()

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 2:26

9-Sep-02 2:26

Jawache wrote:
and its still NOT null by the end of InitInstance()

This is how it's expected to work.

Now, the advanced breakpoint stuff. Open the breakpoints dialog box (Ctrl+B), select the 'Data' tab and type 'theApp.m_pDocManager' (without apostrophes) in the 'Enter the expression to be evaluated' box. Run the program - you should hit the bkpt in the InitInstance first (this is when it's initialized), then for the second time when it gets nullified.

Tomasz Sowinski -- http://www.shooltz.com

** Putt knot yore thrust inn spel chequers. **

Jawache9-Sep-02 2:39