Accessing Private member of a base Class from a Derived Class - C / C++ / MFC Discussion Boards

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Re: Issue with localtime()

Don Rummelhart10-Mar-09 11:25

Don Rummelhart

10-Mar-09 11:25

Hello Peter

I am supporting some VC 6.0 code with localtime and am facing similiar results. I downloaded MSVCRT.DLL version 7.0.2600.3085 and it did not fix the problem.

Setting my time a week ahead fixes the problem.

Even stranger on several of my colleagues systems some VC6.0 applications work correctly and some don't (all call a shared DLL used internally calling localtime).

Very annoying but not a major issue for us as the application is currently only being used interanlly and we can live a week with it.

First Sunday of the month of DST sounds like an old problem resurfacing:

http://seclists.org/bugtraq/2001/Mar/0475.html

Good Luck

Don

Path of Root and Virtual directory in ISAPI ?

mmayur9-Mar-09 8:35

mmayur

9-Mar-09 8:35

Hi,

I'm looking for some inbuilt function that can provide me to get the Root Directory and the path of the Virtual directory - "Default Web site properties" contents. I have to fetch the Home Directory - Local Path.

Does ISAPI filter provide any help?

Regards,
Mayur M

Doubt on how the document object is retrieved to the application class in MFC Document View Architecture

sarathbabununna9-Mar-09 7:55

sarathbabununna

9-Mar-09 7:55

what the each and every function in the code below is doing?
I need crystal clear answer for this.

POSITION pos=GetFirstDocTemplatePosition();
if(pos!=NULL)
{
CSingleDocTemplate * pSingeDocTemplate;

pSingeDocTemplate= (CSingleDocTemplate *)GetNextDocTemplate(pos);

pSingeDocTemplate->GetFirstDocPosition();
CDocViewCommunicationDoc *pDoc=(CDocViewCommunicationDoc *)pSingeDocTemplate->GetNextDoc(pos);

AfxMessageBox (pDoc->m_strDoc);

Re: Doubt on how the document object is retrieved to the application class in MFC Document View Architecture

David Crow9-Mar-09 8:26

David Crow

9-Mar-09 8:26

sarathbabununna wrote:
POSITION pos=GetFirstDocTemplatePosition();

See here.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: Doubt on how the document object is retrieved to the application class in MFC Document View Architecture

Iain Clarke, Warrior Programmer10-Mar-09 1:36

Iain Clarke, Warrior Programmer

10-Mar-09 1:36

In addition to David's reply (which is good - read the documentation for the functions!), you should also look at the documentation page for CDocTemplate.

Your application could handle different kinds of document - for example .bmp, and .jpg. So each document type would have its own CDocument (ie, CMyJpgDocument), and its own CView class (ie, CMyBmpView). This information is called a template, and stored in a CMultiDocTemplate, or CSingleDocTemplate. Each of these is stored in the App object.

So your code is going through all templates, then iterating through all documents created from each template.

You have missed off a few brackets I think!

Try single stepping through the code, and reading the document pages for more information. It is all there.

Iain.

ps, I've never created an app with more than one kind of template, but the possibility exists!

Codeproject MVP for C++, I can't believe it's for my lounge posts...

Scroll Bars and Input Fields

BobInNJ9-Mar-09 7:44

BobInNJ

9-Mar-09 7:44

I have written a simple application that has a horizontal scroll bar and an input field of type
CEdit. Here is the class definition for the main window.

class CMainWindow : public CFrameWnd {<br />
<br />
<br />
public:<br />
	CMainWindow();<br />
	<br />
protected:<br />
	afx_msg int OnCreate( LPCREATESTRUCT );<br />
	afx_msg void OnSize( UINT nType, int cx, int cy );<br />
<br />
	afx_msg void OnPaint();<br />
	afx_msg void OnHScroll( UINT nCode, UINT nPos, CScrollBar *pScrollBar );<br />
<br />
	DECLARE_MESSAGE_MAP()<br />
<br />
private:<br />
<br />
	int charWidth;<br />
<br />
	int m_nPageWidth;<br />
	int m_HorzScrollPos;<br />
<br />
	CEdit input1;<br />
<br />
};

Here is the code that I use to create the window:

<br />
int<br />
CMainWindow::OnCreate( LPCREATESTRUCT lpcs )<br />
{<br />
	if ( CFrameWnd::OnCreate( lpcs ) == -1 )<br />
		return -1;<br />
<br />
	<br />
	TEXTMETRIC tm;<br />
	CClientDC dc(this);<br />
	dc.GetTextMetrics( &tm );<br />
<br />
	charWidth = tm.tmAveCharWidth;<br />
<br />
	input1.CreateEx( WS_EX_CLIENTEDGE, TEXT("edit"), NULL,<br />
                WS_CHILD | WS_VISIBLE | WS_BORDER | WS_TABSTOP | ES_AUTOHSCROLL,<br />
                    150, 125, 60, 20,<br />
                    m_hWnd, (HMENU)500, NULL );<br />
	return 0;<br />
}

Here is the code I use to paint the window:

void<br />
CMainWindow::OnPaint()<br />
{<br />
    CPaintDC dc(this);<br />
    dc.SetWindowOrg( m_HorzScrollPos, 0 );<br />
    dc.TextOut( 150, 100,<br />
      TEXT( "This is a very long string which I hope will take up most of the line" ), 69 );<br />
}

The code, mostly, works. However, I do have one issue. If I run the program and using the mouse I make the window small (in the horizontal direction) a horizontal scroll bar shows up. This is to be expected. I then use the mouse to move the scroll bar to the middle of the window. Now, I minimize the window and then maximize the window. After doing this, I would expect the text and the input field (of type CEdit) to be drawn aligned on the screen. However, this is not the case. The text is shifted to the right (at least relative to the input field). I do not understand why and I am hoping somebody here can tell me what I am missing.

Thanks

Bob

CHtmlView not displaying anything [modified]

Brahmandcoder9-Mar-09 7:08

Brahmandcoder

9-Mar-09 7:08

Hi,
I have created splitter window ,one of the window is of type CFrameWnd which
creates a CHtmlView in it ,so the problem is that whenever Navigate2() (or
Navigate()) is called in OnInitialUpdate() the page is displayed ,but if I
call it in any other function (created by me) and which is called from
CFrameWnd window it does not display anything although OnDocumentComplete()
gets called but nothing is displayed.

here is the code:
To Create the view inside CFrameWnd where CBrowserView is CHtmlView derived
class.

BOOL CBrowserFrame::OnCreateClient(LPCREATESTRUCT lpcs,CCreateContext* 
pContext)
{
    // Create a contextt.
    CCreateContext context;
    pContext = &context;
    // Assign custom view.
  
    pContext->m_pNewViewClass = RUNTIME_CLASS(CBrowserView);

    // Create the view.
	pview = (CBrowserView *) CreateView(pContext, AFX_IDW_PANE_FIRST);
	((CMainFrame*)GetParentFrame())->pBView=pview;
    if (pview ==NULL)
        return FALSE;
   pview->Test(); //Nothing is displayed!!
    // Notify the view.
    pview->SendMessage(WM_INITIALUPDATE);
    SetActiveView(pview, FALSE);
	return CFrameWnd::OnCreateClient(lpcs,pContext);
    
}

In the CBrowserView:

void CBrowserView::OnInitialUpdate()
{
	Navigate2("http://localhost");
	CHtmlView::OnInitialUpdate();
}
void CBrowserView::OnDocumentComplete(LPCTSTR lpszURL)
{
	MessageBox("OnDocumentComplete()");
	CHtmlView::OnDocumentComplete(lpszURL);
}
void CBrowserView::Test()
{
	Navigate("http://www.google.com");
}

And I also want to draw something in this view is it possible using
CClientDC as I am not able to draw anything , and it seems as if the OnDraw()
function of a CHtmlView never gets called?
Please help me.

modified on Monday, March 9, 2009 11:38 PM

Accessing Private member of a base Class from a Derived Class

ForNow9-Mar-09 6:36

ForNow

9-Mar-09 6:36

Hi,

I recently got a answer to a question regarding a CwinThread question

I was pointed to a article on the code project

the following is the URL wwww.codeproject.com/KB/threads/extended_thread_aspx

my question is regarding the following snipet of code from the Article

CThreadEx::CThreadEx (AFX_THREADPROC pfnThreadProc) : CWinThread (pfnThreadProc, NULL) {
m_bAutoDelete = FALSE;

// Undocumented variable. Need to set the thread parameters variable to this
m_pThreadParams = this;
}

The author uses a inilizer list to pass paramters to the base Class'es contructer I have no problem

With this

My problem is the next line of code m_pThreadParam = this

The author points out that this contructer isn't the one documented AFXWIN.H

However I found a more complete discription of the CWinthread in the following PPT
presentation below is the URL
ttp://74.125.47.132/search?q=cache:azRHOpLik8MJ:www.ecs.syr.edu/faculty/fawcett/handouts/cse778/Lecture7/Additional%2520Thread%2520Info/threads.ppt+MORE+ON+THREADS+BUKIN&hl=en&ct=clnk&cd=1&gl=us

Anyway on page 5 of the PPT presentation is a more complete descrption of the CWinThread
Class

and m_pThreadParams seems to be a private member of the base Class CWinThread Class

I haven't build the code in the article but I am wondering if it would work

Re: Accessing Private member of a base Class from a Derived Class

BobInNJ9-Mar-09 7:32

BobInNJ

9-Mar-09 7:32

The first URL you mentioned, I believe is wrong. That is, it starts off with 4 W's. However, even after deleting the extra "W", I could not get there. Are you sure you have the right URL?

Bob

Re: Accessing Private member of a base Class from a Derived Class

David Crow9-Mar-09 8:28

David Crow

9-Mar-09 8:28

BobInNJ wrote:
Are you sure you have the right URL?

Did you not notice the mising extension:

http://www.codeproject.com/KB/threads/extended_thread.aspx[^]

Re: Accessing Private member of a base Class from a Derived Class

ForNow9-Mar-09 12:23

ForNow

9-Mar-09 12:23

Sorry you are right

the second one the titled more on threads by Konstatin page 5 has a detailed listing CthredWin

private:

LPVOID m_pThreadParams; <--- is a private data member //generic parameters passed to starting function

AFX_THREADPROC m_pfnThreadProc; ,

HANDLE m_hThread;

Just cut and paste the link below

http://74.125.47.132/search?q=cache:azRHOpLik8MJ:www.ecs.syr.edu/faculty/fawcett/handouts/cse778/Lecture7/Additional%2520Thread%2520Info/threads.ppt+MORE+ON+THREADS+BUKIN&hl=en&ct=clnk&cd=1&gl=us

Re: Accessing Private member of a base Class from a Derived Class

ForNow9-Mar-09 12:33

ForNow

9-Mar-09 12:33

http://www.codeproject.com/KB/threads/extended_thread.aspx

Sorry this the First Link

Page 5 from the PPT presentation

CWinThread

class CWinThread : public CCmdTarget {

public:

CWinThread();

CWinThread(AFX_THREADPROC pfnThreadProc, LPVOID pParam);

BOOL CreateThread(DWORD dwCreateFlags = 0, UINT nStackSize = 0,

LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL);

virtual BOOL InitInstance();

virtual int Run();

virtual BOOL PreTranslateMessage(MSG* pMsg);

virtual BOOL PumpMessage(); // low level message pump

virtual BOOL OnIdle(LONG lCount); //return TRUE if more idle processing

virtual BOOL IsIdleMessage(MSG* pMsg); //checks for special messages

private:

LPVOID m_pThreadParams; <--- is a private data member

AFX_THREADPROC m_pfnThreadProc;

HANDLE m_hThread; // this thread's HANDLE

} Back to AfxBeginThread()

I use these two functions that I have copied from codeproject to use static text in application. But everytime I put a command button in my applicatio

Astitva239-Mar-09 5:10

Astitva23

9-Mar-09 5:10

I use these two functions that I have copied from codeproject to use transparent static text and background in my application. But everytime I put a command button in my application the application seems to run for milliseconds and vanishes without me closing out. I am a beginner and any suggestion would be great thank you.

HBRUSH CTrialDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
HBRUSH hbr;

if( nCtlColor == CTLCOLOR_STATIC )
{
pDC->SetBkMode(TRANSPARENT);
//pDC->SetTextColor(RGB(255, 0, 0));
hbr = (HBRUSH)GetStockObject( NULL_BRUSH );
}

else
{
hbr = CTrialDlg::OnCtlColor(pDC, pWnd, nCtlColor);
}

return hbr;
}

BOOL CTrialDlg::OnEraseBkgnd(CDC* pDC)
{
CBitmap m_bitmap;
BOOL rVal = FALSE; //CWizardPage_Base::OnEraseBkgnd(pDC);

if( m_bitmap.LoadBitmap( IDB_Background ) )
{
CRect rect;
GetClientRect( &rect );

CDC dc;
dc.CreateCompatibleDC( pDC );
CBitmap* pOldBitmap = dc.SelectObject( &m_bitmap );

pDC->BitBlt( 0, 0, rect.Width(), rect.Height(), &dc, 0, 0, SRCCOPY);

dc.SelectObject(pOldBitmap);
rVal = TRUE;
}

return rVal;
}

Re: I use these two functions that I have copied from codeproject to use static text in application. But everytime I put a command button in my applicatio

Eytukan9-Mar-09 5:31

Eytukan

9-Mar-09 5:31

Astitva23 wrote:

else
{
hbr = CTrialDlg::OnCtlColor(pDC, pWnd, nCtlColor);
}

Shouldn't that be CDialog::?

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

overlayered text

Astitva239-Mar-09 5:57

Astitva23

9-Mar-09 5:57

Yeah It should have been CDialog. Thanks for that.
But I have got another problem now. I am using arrays to display text through my static text and everytime I am displaying the next question, the text is overlayered above the previous one. Is there any function to flush the text...
thank you..
snippet of my code for displaying static text from array:

m_QUESTIONS.SetWindowText(Questions[counter]);
m_cAnswer1.SetWindowText(Answers[counter][0]);
m_cAnswer2.SetWindowText(Answers[counter][1]);
m_cAnswer3.SetWindowText(Answers[counter][2]);
m_cAnswer4.SetWindowText(Answers[counter][3]);

Re: overlayered text

Eytukan9-Mar-09 6:03

Eytukan

9-Mar-09 6:03

Astitva23 wrote:
function to flush the text

Don't get your question fully. May be you are looking for a "setWindowText("")"? Guess
not. Ok dinner time. May be back in 30 mins. Wink | ;)

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

Re: overlayered text

Astitva239-Mar-09 8:05

Astitva23

9-Mar-09 8:05

I will probably scratch the head of my tutor for this one. Anyway thanks for the effort...

unicode application

tom groezer9-Mar-09 4:47

tom groezer

9-Mar-09 4:47

I have an application that is running on a japanese machine and it seems that the code in that application is not working properly.
It is having a char a[256] array and it looks like the char array is not getting populated with a string.
In all strcpy(a, "test is here") is not working. Is this something related to unicode stuff on japanese locale. Will usage of tchar solve the problem?

Re: unicode application

David Crow9-Mar-09 4:49

David Crow

9-Mar-09 4:49

tom groezer wrote:
Will usage of tchar solve the problem?

Have you tried it to see?

Re: unicode application

Eytukan9-Mar-09 5:04

Eytukan

9-Mar-09 5:04

tom groezer wrote:
Will usage of tchar solve the problem?

But you will have to replace those functions with equivalent _tcs functions. If you want to completely move to UNICODE and no looking back, you can choose wchar_t and the corresponding wcs functions.

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

Re: unicode application

tom groezer9-Mar-09 7:03

tom groezer

9-Mar-09 7:03

Application uses multibyte character set but the symbol _UNICODE is not defined. Nit sure if the LOCALE Japanese can make the application to run in Unicode format?

Re: unicode application

Eytukan9-Mar-09 7:35

Eytukan

9-Mar-09 7:35

tom groezer wrote:
Application uses multibyte character set but the symbol _UNICODE is not defined

You mean "And"?

When you declare, MBCS, you should not use UNICODE. And Japanese letter would work with UNICODE. Remove MBCS if you had defined in your settings. and add UNICODE,_UNICODE.

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

Re: unicode application

tom groezer9-Mar-09 7:45

tom groezer

9-Mar-09 7:45

Sorry to not make you understand. The project uses MBCS settings. It can't be set to unicode settings.
I was thinking if this app is made to run on a japanese m/c is there a way that locale settings could turn the application to be unicode aware.Is that is the case, since my application code used char array and strcpy function would it make it compulsory to change the application code to use -tcscpy and tchar array. This application code works perfectly on a my system.

Re: unicode application

Jeremy Falcon9-Mar-09 8:09

Jeremy Falcon

9-Mar-09 8:09

tom groezer wrote:
Sorry to not make you understand. The project uses MBCS settings. It can't be set to unicode settings.

Then use the character mapping routines in tchar.h. It'll handle MBCS, Unicode, or ANSI. Just learn the equivalent string functions for it.

tom groezer wrote:
This application code works perfectly on a my system.

Probably because your system isn't a Japanese one. Just use the character mapping routines in tchar.h and you'll be ok.

Jeremy Falcon
jeremyfalcon.com[^]

sockets in MFC

hrishiS9-Mar-09 2:16

hrishiS

9-Mar-09 2:16

Hi to All,

First of all thanks to all for replies to my previous post.

I am going to do an simple chat application on a network(LAN).Using MFC.I wanted an advice whether to do it as dialog based, SDI or MDI? The application should be more or less the same as GTalk

Please advice for both client and server.

Thanks in Advance

I am a beginner

Last Visit: 31-Dec-99 18:00 Last Update: 30-May-24 23:38

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