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Hello again,
I have three class and one mainframe for my project.
one class(calculator) holds bunch of functions and commands and button that works fine(formview class with mfc) in the same class i defined tabcontrol called mytabcontrol and in each tab i have one common class called tab_one. now tab_one gets data from calculator and displays graph of those values and when i switch tab it suppose to read data again from calculator and redraw graph. I tried invalidate() and invalidateRect functions but it shows m_hWnd has not been used and 0X000000.
if anyone got clue how to solve this. Please reply.
I will post details of program and problem later.
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Assuming it's the tab_one instances you are trying to repaint:
Have you created the instances of your tab_one class by using one of the various Create functions? From the error description it looks like you are trying to use a window object that was never created (or was created, but then destroyed)
Either you create all instances when you create the tab control, or you create the required instance when a tab is activated the first time.
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tab_one is child dialog and it is under mytabcontrol so if i switch tabs in tab control it calls method of my tab_one class.
Creation of tab_one.h :
class CTab_one : public CDialog
{
DECLARE_DYNAMIC(CTab_one)
private:
//variables
public:
CTab_one(CWnd * pParent=NULL); // standard constructor
virtual ~CTab_one();
#ifdef _DEBUG
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
#endif
// Dialog Data
public:
enum { IDD = IDD_TAB_ONE };
public:
//variables declaration
public:
//methods
virtual BOOL OnInitDialog();
protected:
virtual void OnPrint(CDC *pDC, CPrintInfo *pInfo);
virtual void OnDraw( CDC * pDC);
protected:
virtual void DoDataExchange(CDataExchange* pDX);
afx_msg void OnFileSave();
afx_msg void OnPaint();
afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
DECLARE_MESSAGE_MAP()
};
#endif
tab_one.cpp
// CTab_one.cpp : implementation file
//
#include "stdafx.h"
#include "Tab_one.h"
#include "afxwin.h"
IMPLEMENT_DYNAMIC(CTab_one, CDialog)
CTab_one::CTab_one(CWnd* pParent /*=NULL*/)
: CDialog(CTab_one::IDD, pParent)
{
}
CTab_one::~CTab_one()
{
}
void CTab_one::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}
BOOL CTab_one::OnInitDialog( void)
{
CDialog::OnInitDialog();
CTab_one::GetSafeHwnd();
CString cstring = " It exists";
if(::IsWindow(m_hWnd)) {
AfxMessageBox(cstring); // it does have value here
// - m_hWnd 0x000f0c30 {unused=??? } HWND__ *
unused CXX0030: Error: expression cannot be evaluated
}
GetParentFrame()->RecalcLayout();
CDialog *ctab; // to check m_hWnd value
GetDefaultValues();//method in tab_one
return true;
}
BOOL CTab_one::CreateModelessDlg(void)
{
// TODO: Add your specialized code here and/or call the base class
return (CDialog::Create(CTab_one::IDD, this)!=0);
}
int CTab_one::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CDialog::OnCreate(lpCreateStruct) == -1)
return -1;
// TODO: Add your specialized creation code here
return 0;
}
BEGIN_MESSAGE_MAP(CTab_one, CDialog)
ON_WM_PAINT()
ON_WM_CREATE()
ON_COMMAND(ID_FILE_SAVE, OnFileSave)
END_MESSAGE_MAP()
void CTab_one::OnPrint( CDC * pDC, CPrintInfo * pInfo)
{
// TODO: add customized printing code here
this->OnDraw(pDC);
}
void CTab_one::OnPaint()
{
CPaintDC dc(this);
OnDraw( &dc );
}
#ifdef _DEBUG
void CTab_one::AssertValid() const
{
CDialog::AssertValid();
}
void CTab_one::Dump(CDumpContext& dc) const
{
CDialog::Dump(dc);
}
#endif //_DEBUG
// method that i am trying to access from mytab control
void ongraph1()....
calls updategraph()
void CTab_one::OnDraw(CDC * pDC)
{
CString szTitle;
(void)szTitle.LoadString(AFX_IDS_APP_TITLE);
AfxGetApp()->m_pMainWnd->SetWindowText(szTitle);
this->DrawCoordinates( pDC);// this draws lines in graph for all diffrent graphs
//draw graphics
DisplayTm_vs_Rb_Graph( pDC); // method that draws graph
} // end CGphView::OnDraw
void __stdcall CTab_one::DrawCoordinates( CDC * pDC)
{
}
finally :
void __stdcall CTab_one::UpdateGraph( )
{
InvalidateRect(NULL,false); // m_hwnd never used no value
}
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Hey,
Yes I Do have instance created in mytabcontrol of tab_one but when i tell tab_one to call that method which actully draws graph and then repaint that in tab_one ..it gets confused with m_hWnd it shows m_hWnd is 0X00000 means there is no window because that method got called by mytabcontrol.
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Having an instance of the tab_one class is not enough to get this right. I think you might be taking construction for creation. You construct a window wrapper object in the constructor, but that does not create the underlying window. It will however set m_hWnd to NULL. You have to call one of the Create methods in order to get a valid window handle, m_hWnd.
If you do this when your entire tab control is created, or better yet, when a tab is inserted into your tab control, you will not run into this problem.
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ok so you trying to say when i am trying to call anymethod from outside of tab_one class i will have to recreate the tabs? or i call method create inside the tab_one. I have mytabcontrol which controls all tabs and tab_one which draw something inside each tab(dialog box) could you please try to reply me practically maybe in code would help..
thanks a lot.
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I assume you have something like the following:
1. A form view or dialog that contains your tab control, say FormDlg.
2. A tab control class, either a CTabCtrl or a class derived from that.
3. This tab control contains a few tabs, where each should display a child dialog of type tab_one or derived from tab_one.
First, you either add a tab control in the resource editor and hook it up to a member variable of your FormDlg class, m_tabs. Or you create a tab control dynamically in FormDlg using CTabCtrl::Create().
Now every time you insert a new tab using CTabCtrl::InsetItem(), you also create a child dialog of type tab_one, using tab_one::Create(). You can also chose to create all these child dialogs when the tab control is first created, if the control has a fixed set of tabs. Make sure you position the child dialog relative your tab controls client area. It's a bit tricky, since the client area also includes the actual tabs at the top (stupid design I know) but you can get the hight if the tabs and adjust your display rectangle.
If the tab control is self contained, you keep those dialogs as members of your tab control derived class, otherwise they can be members of your FormDlg.
Now, displaying the proper child dialog is just a matter of responding the the TCN_SELCHANGE message and call tab_one::ShowWindow(SW_SHOW) for the activated tab, and ShowWindow(SW_HIDE) for the others.
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Hey, thx for your reply
ok let me explain what i have done brifley,
I Have 3 classes.
First one is gphview which is formview based class which contains mytabctrl and on half window it contains some function of calculater(adding,multiply,subtract)
Second one is mytabcontrol which holds 9 different tabs and create dialog for each tab
Lastone is tab_one class which is dialog based class which draws the graphs according to tab selected.
In first gphView class :
void GphView::OnInitialUpdate( void)
{
CFormView::OnInitialUpdate();
GetParentFrame()->RecalcLayout();
ResizeParentToFit();
m_tabMyTabCtrl.InsertItem(0, _T("Graph1"));
m_tabMyTabCtrl.InsertItem(1, _T("Graph1"));
m_tabMyTabCtrl.InsertItem(2, _T("Graph1"));
m_tabMyTabCtrl.InsertItem(3, _T("Graph1"));
m_tabMyTabCtrl.InsertItem(4, _T("Graph1"));
m_tabMyTabCtrl.InsertItem(5, _T("Graph1"));
m_tabMyTabCtrl.InsertItem(6, _T("Graph1"));
m_tabMyTabCtrl.InsertItem(7, _T("Graph1(occupied)"));
m_tabMyTabCtrl.Init();
}
In mytabctrl class:
CMyTabCtrl::CMyTabCtrl()
{
pTab = new CTab_one(this); // instance of tab_one class declared in header file CTab_one *pTab;
}
CMyTabCtrl::~CMyTabCtrl()
{
}
void CMyTabCtrl::Init()
{
m_tabPages[0]=new CTab_one; // m_tabpages declared in header like this CDialog *m_tabPages[8];
m_tabPages[1]=new CTab_one;
m_tabPages[2]=new CTab_one;
m_tabPages[3]=new CTab_one;
m_tabPages[4]=new CTab_one;
m_tabPages[5]=new CTab_one;
m_tabPages[6]=new CTab_one;
m_tabPages[7]=new CTab_one;
m_nNumberOfPages=8;
m_tabCurrent=0;
m_tabPages[0]->Create(IDD_TAB_ONE,this);
m_tabPages[0]->ShowWindow(SW_SHOW);
m_tabPages[1]->Create(IDD_TAB_ONE,this);
m_tabPages[1]->ShowWindow(SW_HIDE);
m_tabPages[2]->Create(IDD_TAB_ONE, this);
m_tabPages[2]->ShowWindow(SW_HIDE);
m_tabPages[3]->Create(IDD_TAB_ONE, this);
m_tabPages[3]->ShowWindow(SW_HIDE);
m_tabPages[4]->Create(IDD_TAB_ONE, this);
m_tabPages[4]->ShowWindow(SW_HIDE);
m_tabPages[5]->Create(IDD_TAB_ONE, this);
m_tabPages[5]->ShowWindow(SW_HIDE);
m_tabPages[6]->Create(IDD_TAB_ONE, this);
m_tabPages[6]->ShowWindow(SW_HIDE);
m_tabPages[7]->Create(IDD_TAB_ONE, this);
m_tabPages[7]->ShowWindow(SW_HIDE);
SetRectangle();
}
void CMyTabCtrl::SetRectangle()
{
CRect tabRect, itemRect;
int nX, nY, nXc, nYc;
GetClientRect(&tabRect);
GetItemRect(0, &itemRect);
nX=itemRect.left;
nY=itemRect.bottom+1;
nXc=tabRect.right-itemRect.left-1;
nYc=tabRect.bottom-nY-1;
m_tabPages[0]->SetWindowPos(&wndTop, nX, nY, nXc, nYc, SWP_SHOWWINDOW);
for(int nCount=1; nCount < m_nNumberOfPages; nCount++){
m_tabPages[nCount]->SetWindowPos(&wndTop, nX, nY, nXc, nYc, SWP_HIDEWINDOW);
}
}
BEGIN_MESSAGE_MAP(CMyTabCtrl, CTabCtrl)
//{{AFX_MSG_MAP(CMyTabCtrl)
ON_WM_LBUTTONDOWN()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CMyTabCtrl message handlers
void CMyTabCtrl::OnLButtonDown(UINT nFlags, CPoint point)
{
CTabCtrl::OnLButtonDown(nFlags, point);
if(m_tabCurrent != GetCurFocus())
{
if(m_tabCurrent<=8){ m_tabPages[m_tabCurrent]->ShowWindow(SW_HIDE);}
m_tabCurrent=GetCurFocus();
m_tabPages[m_tabCurrent]->ShowWindow(SW_SHOW);
m_tabPages[m_tabCurrent]->SetFocus();
}
if(m_tabCurrent==0){
pTab->OnGraph4();}
}
And I have mentioned tab_one class in previous post..
thx..
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Please use the code block button when pasting code. It will make it readable.
The code is roughly what I suggested. But I don't understand what
pTab = new CTab_one(this);
is doing i the contructor? What do you need that page for? And also it has to be deleted in the destructor. I suggest you declare it as CTab_one m_tab; in the class declaration instead.
Also, there is a message for when the active tab is changed as per my last message. Relying on WM_LBUTTONDOWN is not enough, since one can navigate using keyboard.
Was there a question in your last post? 
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Hey,
Thx a lot for your replies. I have already solved my problem for redrawing graph it was just small stupid pointer mistake i wasn't passing correct value and yeah thx for TCN_SELCHANGE message i was wondering about it but didn't have time to look at it. I will have to google how that works. Could you let me know how that works like what method it will call. and wat's exact message for that.
Thx again,
cheers from CANADA
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The message description is here[^].
You can create a message handler for it in the resource editor, or using the properties->message window.
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Is there anyway i can resize my tabcontrol. like i wana have some feature like when you double click graph inside tab it will resize to mainwindow and when you double click again it will be back as normal window.
I had couple of thoughts like creating frame for tabcontrol and another for rest of the form and then just deal with frame but didn't work.
thx
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Well, you could just resize it using SetWindowPos(), and then temporarily change the parent window to your CMainFrame I suppose.
Another way might be to mimic the behavior of print preview, but without the printing so to speak.
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Yet problem's not solved  .
Now you know I have two main class. calculator and tab_one(graphs). now calculator is formview and tab_one is dialog box. now everytime i change something in calculator i will need to redraw graphs in dialog box so i will call invalidate but dialog box will need to get new values from calculator, so i created instance of calculator in tab_one but everytime i call invalidate it creates new calculator and all values goes to default value thus not able to get new values.
any clue ?
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Can't you just set a pointer to your main calculator in your tab_one dialog? Then you can read up-to-date data from the calculator when repainting your dialog.
A better way would be to have a data object, containing all current information in your calculator. This should be owned by the calculator. Then set a pointer to this in your tab_one.
Did that make sense?
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i don't know if that makes sense or not but somehow i managed to solve that problem.
What I did is.
mytabcontrol was inside of calculator
so whenever i changed something i inform that to mytabcontrol ( i have valid m_hWnd since it's inside calculator )
now all tabs are initialized inside tab control so they wont have problem getting m_hWnd for tabone so if they get called they will inform tab_one to redraw it(invalidate) now problems was if i calls tab_one from tabcontrol , then tab_one will be reinitialzed which will read defaults values of calculaotr so graph will be same.
now i have calcparam which holds all values of calculator inside(calculator)
and tab_one was reading those value. but now i created another calcparam inside tab_one and made sure tab_one read that calcparam not the one from calculator and if i change something in calculator.
it does this
memcpy( &m_tabMyTabCtrl.m_tabPages[i]->CalcParam,&CalcParam,sizeof(CALC_PARAMS));
m_tabMyTabCtrl.m_tabPages[i]->Invalidate( );
// m_tabmytabcontrol is instance of mytabcontrol inside gphview and tabpages is instance of tabone defined in mytabcontrol
that's how i got it work.
anyways thx a lot,
cheers from canada.
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mohit`12 wrote: anyways thx a lot,
You're welcome
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if m_hWnd is 0X000000 means that the windows isnt created or yet destroyed.
Press F1 for help or google it.
Greetings from Germany
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okay Hey,
I found out my problem but no solution yet. The reason m_hWnd is getting null because i am trying to update tab_one out side of that class which is mytabcontrol:
This is what happening :
My Tab Control (Holds Tab) Tab_one ( Holds data and on draw graph)
switch tab(tab_current changes) Draws first graph initial graph
if(tab_current changes) OnDraw() is called
tab_one is already initialized
---------> calls method -----------> ongraph1(){changes graph &try to update which should call ondraw again
it wont update because ongraph1() got called by mytabcontrol who doesn't know what m_hWnd is for tab_one if you call updategraph() inside of tab_one it will work and will show value of m_hWnd..but from mytabcontrol NOPE..
so is there anyway i can inform mytabcontrol that tab_one is initialzed and has soem value of m_hWnd and use that value to updategraph.
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you are mixing something that is buggy. Use some pointers to the approbiate objects.
Press F1 for help or google it.
Greetings from Germany
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I Know it's buggy and that's y i am here to find solution and solve buggy code.
thx tho.
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we have a saying: "Help yourself and so god will help you".
you got to do your homeworks yourself
Press F1 for help or google it.
Greetings from Germany
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haha. I think that saying "" does WORK.. I was trying this since last week and finally today i solved it. GOD HELPED ME....It wasn't that easy though. But this is not the end yet..got some more problems to solve. Let the GOD help me for all of them 
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In a form, I am having a message map at the Tab-level like below:
ON_NOTIFY_RANGE(DTN_DATETIMECHANGE, DLG_CTRLBASE, DLG_CTRLBASE + DLG_MAXITEMS_CTRL, OnDateTimeChange)
From TabCtrl::OnDateTimeChange(), I have a call to next level DataFormDlg::OnDateTimeChange
TabCtrl::OnDateTimeChange
{
DataFormDlg->OnDateTimeChange;
}
Inside DataFormDlg, I have another message map as below
ON_NOTIFY_RANGE(DTN_DATETIMECHANGE, DLG_CTRLBASE, DLG_CTRLBASE + DLG_MAXITEMS_CTRL, OnDateTimeChange) and the function is
DataFormDlg::OnDateTimeChange ()
{
//body
}
Now when I click at the datepicker control, the DTN_DATETIMECHANGE event is triggering twice. So, the TabCtrl -> DataFormDlg -> OnDateTimeChange() is executing twice.
Could you please help me finding what is going wrong here?
Thanks,
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