Re: Where to Put ShowWindow - C / C++ / MFC Discussion Boards

Re: Where to Put ShowWindow

chandu00412-Oct-07 21:31

chandu004

12-Oct-07 21:31

GauranG33 wrote:
.(I have set the registry, so that it runs at startup).

can you please guide me how you have achieved this.
this is great because, i have been trying this since a couple of months but in vain.

and to your question, i have temporary solution.
1.set the dialog properties in such a way that, it does not have any border.
so that, it will be always running in the background, and gets displayed only if the user clicks the icon in the taskbar.
2.if you know, how to track the GetFocus and Lost Focus events, then, i can suggest a better solution.

gud luck.

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

Re: Where to Put ShowWindow

Tony Hill13-Oct-07 0:55

Tony Hill

13-Oct-07 0:55

Try reading this page http://www.codeproject.com/dialog/dlgboxtricks.asp[^]

Re: Where to Put ShowWindow

Mark Salsbery13-Oct-07 6:36

Mark Salsbery

13-Oct-07 6:36

Why not just create the main window without the WS_VISIBLE flag
so you don't have to worry about hiding it?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Curiosity

Nelek14-Oct-07 21:39

Nelek

14-Oct-07 21:39

If this solution is taken... The controls can not be used while the window is invisible, but if you use other things as triggers (for example a timer) then the code will be called anyways.

Am I right?

But if you make the WS_VISIBLE away, and in some conditions need the window another time... can you make it visible with the ShowWindow (TRUE) ??? Or won't be posible because the property has not been set?

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Re: Curiosity

Mark Salsbery15-Oct-07 5:50

Mark Salsbery

15-Oct-07 5:50

It just creates the window hidden. It won't get any messages
from user like mouse messages because it's not visible. It will still
get messages from timers or messages you send to it.
It's just hidden...ShowWindow(SW_SHOW) will make it visible.

Hidden windows are common. The CSocketWnd used by the
CAsyncSocket class is an example of a hidden window.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Curiosity

Nelek15-Oct-07 22:49

Nelek

15-Oct-07 22:49

Ok, thank you.

Re: Where to Put ShowWindow

David Crow14-Oct-07 17:22

David Crow

14-Oct-07 17:22

See here.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Where to Put ShowWindow

GauranG Shah14-Oct-07 19:49

GauranG Shah

14-Oct-07 19:49

Hey Thanx David.

I see the Solution you have suggested, but the problem is the solution is for MFC Application while I am using Win32 API .

Can You help me with this. ???

I have tried somthing like this. but the Same thing. Errors,
I have Taken the Global Boolean flag First. But dont know where to initialize it to True. So I have initialize it in WM_INITDIALOG.

case WM_WINDOWPOSCHANGING:
 if(First)
 {
 if ( ! ShowWindow(hWndDlg,SW_HIDE) )
	  dError = GetLastError();
      First = FALSE;
  }
break;

case WM_INITDIALOG :

     First  = TRUE;
      ...
      ...

 break;

[ Screen Capture ][ Tool Tip ]

Re: Where to Put ShowWindow

David Crow15-Oct-07 3:13

David Crow

15-Oct-07 3:13

GauranG33 wrote:
I have tried somthing like this. but the Same thing. Errors,

Because you did not remove the SWP_SHOWWINDOW flag.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Where to Put ShowWindow [SOLVED]

GauranG Shah14-Oct-07 23:59

GauranG Shah

14-Oct-07 23:59

I have got the Idea to do do this.

I am using the timer in WM_INIT for about 100 msec. and in the WM_TIMER I am using ShowWinow() to hide the Dialog.

Currently It is working fine. But I just want to know will this work all the time. Or there will be the case it can fail.

the Code I am using is as follows

case WM_TIMER:
		ShowWindow(hWndDlg, FALSE);
		KillTimer(hWndDlg,0);

		break;

case  WM_INITDIALOG:
		...
                ...
                SetTimer(hWndDlg,0,100,0);
                break;

[ Screen Capture ][ Tool Tip ]

Re: Where to Put ShowWindow [SOLVED]

Mark Salsbery15-Oct-07 5:51

Mark Salsbery

15-Oct-07 5:51

I'm still wondering why this has to be so complicated.

If you never show the window to begin with then there's
no reason to go through all of this to hide it.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

dynamic Listbox control

s196675m12-Oct-07 20:52

s196675m

12-Oct-07 20:52

I have created a dynamic list box control in my dialog based application.
This list shows threes item but does not response to button click or selection change.

Using Wizard, I can not add any handler function for this because it does not exist before program run.

How Can I add handler for this dynamic control so that I can respond to button click or selection change.

Do I need to use derived class to do this? Is there any way without using derived class.
Simple code example will be great. I am new in VC++.
Thank you.

msc

Re: dynamic Listbox control

Hamid_RT12-Oct-07 20:55

Hamid_RT

12-Oct-07 20:55

How did you make it can you show your code?

Re: dynamic Listbox control

chandu00412-Oct-07 21:23

chandu004

12-Oct-07 21:23

simple,
1.create a static listbox control,
2.add the event handler to that listbox control,
3.then observe dodataexchange and(or) beginmessagemap sections in your dialog.
4.what ever lines of code are added newly related to your static control,
5.duplicate them and alter the duplicated lines as per your dynamic control.

the above suggestions only give you a overview of how to do it.
you may have to put some efort and your own intelligense there, to sort it out.
and after that, you may get some more doubts like,
if i create the dynamic controls as an array, then how?
try to solve them yourself or post back.

gud luck.

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

Re: dynamic Listbox control

s196675m13-Oct-07 5:13

s196675m

13-Oct-07 5:13

Hi Chandu
Thank you for your nice suggession. I tried to follow what you said. I have a member variable of CListBox pointer and I have created dynamic listbox in OnInitDialog() but I think DoDataExchange called before calling OnInitDialog and does not find the window handle and crushes.
Here is what I did: Please let me know if I did anything wrong based on your suggesstion. ====================
1.declared in header file
protected:

<br />
<br />
	HICON m_hIcon;<br />
	CListBox* m_dynalist;// dynalic listbox member<br />
	// Generated message map functions<br />
	//{{AFX_MSG(CTestdynDlg)<br />
	virtual BOOL OnInitDialog();<br />
	afx_msg void OnPaint();<br />
	afx_msg HCURSOR OnQueryDragIcon();<br />
	afx_msg void OnButton1();<br />
	afx_msg void OnSelchangeList();// function for static listbox<br />
	afx_msg void OnSelchangeDynaList();// manually added function for dynamic list box<br />
<br />
	//}}AFX_MSG<br />
<br />
	DECLARE_MESSAGE_MAP()<br />
<br />
2. In .cpp file<br />
void CTestdynDlg::DoDataExchange(CDataExchange* pDX)<br />
{<br />
	CDialog::DoDataExchange(pDX);<br />
	//{{AFX_DATA_MAP(CTestdynDlg)<br />
	DDX_Control(pDX, IDC_LIST, m_list);// static listbox<br />
	DDX_Control(pDX, IDC_LISTTEST, *m_dynalist);//dynamic listbox<br />
	DDX_Control(pDX, IDC_EDIT, m_edit);<br />
	DDX_Text(pDX, IDC_EDIT, m_editstr);<br />
	//}}AFX_DATA_MAP<br />
<br />
}<br />
<br />
BEGIN_MESSAGE_MAP(CTestdynDlg, CDialog)<br />
	//{{AFX_MSG_MAP(CTestdynDlg)<br />
	ON_WM_PAINT()<br />
	ON_WM_QUERYDRAGICON()<br />
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)<br />
	ON_LBN_SELCHANGE(IDC_LIST, OnSelchangeList)//static listbox<br />
	ON_LBN_SELCHANGE(IDC_LIST, OnSelchangeDynaList)// dynamic listbox<br />
<br />
	//}}AFX_MSG_MAP<br />
<br />
END_MESSAGE_MAP()<br />
<br />
// handler for dynamic listbox for selection change<br />
void CTestdynDlg::OnSelchangeDynaList() <br />
{<br />
	// TODO: Add your control notification handler code here<br />
	CString  str;<br />
	int isel = m_dynalist->GetCurSel();<br />
	m_dynalist->GetText(isel,str);<br />
	m_editstr = str;<br />
	m_edit.SetWindowText(str);<br />
	<br />
}<br />

msc

Re: dynamic Listbox control

chandu00413-Oct-07 5:50

chandu004

13-Oct-07 5:50

wait for some time may be 30 minutes,
i shall have my dinner, refer my backups and reply exactly.
meanwhile try it ur self.

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

Re: dynamic Listbox control [modified]

Mark Salsbery13-Oct-07 7:06

Mark Salsbery

13-Oct-07 7:06

s196675m wrote:
I think DoDataExchange called before calling OnInitDialog

It's called BY CDialog::OnInitDialog().

You need to do your creation before calling the base class
OnInitDialog(), and also check for a valid pointer in your
DoDataExchange() override...

void CTestdynDlg::DoDataExchange(CDataExchange* pDX)
{
   CDialog::DoDataExchange(pDX);
   //{{AFX_DATA_MAP(CTestdynDlg)
   DDX_Control(pDX, IDC_LIST, m_list);// static listbox
   <font color="Red">if (m_dynalist)</font>
   <font color="Red">{
      //**EDIT** Actually DDX_Control isn't needed.  The control is already subclassed
      //   when it is created
</font>      <font color="Red">//DDX_Control(pDX, IDC_LISTTEST, *m_dynalist);//dynamic listbox</font>
   <font color="Red">}</font>
   DDX_Control(pDX, IDC_EDIT, m_edit);
   DDX_Text(pDX, IDC_EDIT, m_editstr);
   //}}AFX_DATA_MAP
}

BOOL CTestdynDlg::OnInitDialog()
{
   <font color="Red">// create m_dynalist here!</font>

   <font color="Red">// Now call the base class OnInitDialog()</font>
   CDialog::OnInitDialog();
}

Last modified: 55mins after originally posted --

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: dynamic Listbox control

chandu00413-Oct-07 7:24

chandu004

13-Oct-07 7:24

if mark's suggestion, worked for you, then its fine.
byt in my application, i have not taken a pointer *m_dynalist, instead, i took normal variable(in my case, array).it worked quite comfortably for me.

s196675m wrote:
DDX_Control(pDX, IDC_LISTTEST, *m_dynalist);//dynamic listbox

s196675m wrote:
ON_LBN_SELCHANGE(IDC_LIST, OnSelchangeDynaList)// dynamic listbox

in both the above cases, instead of IDC_LISTTEST, i have used some unique number like, for example, 10001
and i have used the same number while creation in the initdialog.

what i observe in your case is, you are declaring it as pointer and you are not creating memory for it using new.

if iam right, try creaitng the memory and see or use normal variable instead of pointer.
any more clarifications required?

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

Re: dynamic Listbox control

s196675m13-Oct-07 7:57

s196675m

13-Oct-07 7:57

Hi I tried mark's suggession but still no luck.
Yes I have create memeory using new and I also used unique number defined for IDC_LISTTEST. I am scratching my head for last two days even can not make it work. I will be glad if you can help me to make it work
I need to understand this concept, otherwise I can not go forward.

Here is updated code:

<br />
void CTestdynDlg::DoDataExchange(CDataExchange* pDX)<br />
{<br />
	CDialog::DoDataExchange(pDX);<br />
	//{{AFX_DATA_MAP(CTestdynDlg)<br />
	DDX_Control(pDX, IDC_LIST, m_list);<br />
	if (m_dynalist){<br />
		DDX_Control(pDX, IDC_LISTTEST, *m_dynalist);<br />
	}<br />
	DDX_Control(pDX, IDC_EDIT, m_edit);<br />
	DDX_Text(pDX, IDC_EDIT, m_editstr);<br />
	//}}AFX_DATA_MAP<br />
<br />
}<br />
<br />
BEGIN_MESSAGE_MAP(CTestdynDlg, CDialog)<br />
	//{{AFX_MSG_MAP(CTestdynDlg)<br />
	ON_WM_PAINT()<br />
	ON_WM_QUERYDRAGICON()<br />
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)<br />
	ON_LBN_SELCHANGE(IDC_LIST, OnSelchangeList)<br />
	ON_LBN_SELCHANGE(IDC_LISTTEST, OnSelchangeDynaList)<br />
<br />
	//}}AFX_MSG_MAP<br />
<br />
END_MESSAGE_MAP()<br />
<br />
BOOL CTestdynDlg::OnInitDialog()<br />
{<br />
<br />
	m_dynalist = new CListBox;<br />
<br />
	m_dynalist->CreateEx( WS_EX_LEFT | WS_EX_LTRREADING | WS_EX_TOOLWINDOW,<br />
	_T("LISTBOX"),<br />
	NULL,<br />
	WS_CHILD | WS_BORDER,<br />
	CRect(0, 0, 100, 70),<br />
	this,<br />
	IDC_LISTTEST,<br />
	NULL);<br />
	CDialog::OnInitDialog();<br />
<br />
	// Set the icon for this dialog.  The framework does this automatically<br />
	//  when the application's main window is not a dialog<br />
	SetIcon(m_hIcon, TRUE);			// Set big icon<br />
	SetIcon(m_hIcon, FALSE);		// Set small icon<br />
<br />
	// dynamic list control<br />
	m_dynalist->MoveWindow(130,200, 110, 100);<br />
<br />
	m_dynalist->AddString("oone");<br />
	m_dynalist->AddString("TTwo");<br />
<br />
	m_dynalist->UpdateData(FALSE);// false true both same effect here<br />
	m_dynalist->ShowWindow(SW_SHOW);<br />
	<br />
	// TODO: Add extra initialization here<br />
	// static list control<br />
	m_list.InsertString(0,"one");<br />
	m_list.InsertString(1,"two");<br />
	m_list.InsertString(2,"three");<br />
<br />
<br />
	return TRUE;  // return TRUE  unless you set the focus to a control<br />
}<br />
void CTestdynDlg::OnSelchangeDynaList() <br />
{<br />
	// TODO: Add your control notification handler code here<br />
	CString  str;<br />
<br />
	int isel = m_dynalist->GetCurSel();<br />
	m_dynalist->GetText(isel,str);<br />
	m_editstr = str;<br />
	m_edit.SetWindowText(str);<br />
	<br />
}<br />
<br />
<br />

msc

Re: dynamic Listbox control

Mark Salsbery13-Oct-07 8:03

Mark Salsbery

13-Oct-07 8:03

What's not working?

Check out my previous post....I changed a line...

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: dynamic Listbox control

chandu00413-Oct-07 8:09

chandu004

13-Oct-07 8:09

do as mark said, or otherwise, if your application is light weighted, means, no dependencies like database etc,
and if it is in visual c++ 6.0, then mail me i shall see it.
chandu004@yahoo.com.
after mailing please indicate it here.

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

Re: dynamic Listbox control

s196675m13-Oct-07 8:50

s196675m

13-Oct-07 8:50

I have sent my project files to you. Please have a look. I am using VC++6.0
I really appreciate you help.

Re: dynamic Listbox control

chandu00413-Oct-07 9:54

chandu004

13-Oct-07 9:54

received your source code.
but it is still downloading.
you would have deleted teh debug folder and zipped it.
any way,
i will go through it and come back.

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

Re: dynamic Listbox control

Mark Salsbery13-Oct-07 8:10

Mark Salsbery

13-Oct-07 8:10

s196675m wrote:
m_dynalist->UpdateData(FALSE);// false true both same effect here

It may be true that it has the same effect in this case but that's not true in general.

First, you should be passing FALSE when calling UpdateData() from OnInitDialog.

Second, CDialog::OnInitDialog() Calls UpdateData(FALSE) for you....it's redundant to call
it again unless you've actually made a modification that effects DDE - you haven't here.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: dynamic Listbox control

s196675m13-Oct-07 8:52

s196675m

13-Oct-07 8:52

Hi Mark
If you want I can send you the source file.
Thank you and appreciate your help

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.