Re: OnInitDialog() is not called? - C / C++ / MFC Discussion Boards

transoft4-Jun-09 6:34

4-Jun-09 6:34

Hi

I designed a new dialog class as:

class CDialogBase : public CDialog
{
public:
CDialogBase( CWnd* parent, UINT resId );
virtual ~CDialogBase() { }
protected:
void EvHelp(HELPINFO*);

virtual BOOL OnInitDialog();
virtual void OnOK() {};

protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support

public:
afx_msg virtual void CMHelp();

DECLARE_MESSAGE_MAP( );
};

I did following:

CAboutDialog *pAboutDialog = new CAboutDialog( .... ); ---> CAboutDialog is inherited from "CDialogBase "
pAboutDialog->DoModal();

But OnInitDialog() is not called. Where is the problem?

Thanks,

Re: OnInitDialog() is not called?

norish4-Jun-09 7:07

norish

4-Jun-09 7:07

pAboutDialog->DoModal();

will immediatelly return?

If then instantiation of CAboutDialog has some error.
I know a case cause this situation.
Check the resource id is exist and reffer exact dialog resource.

If resource id is valid, I'm not sure, maybe some declaration is not matched their prototypes or no appropriate message mapping macro defined...

Re: OnInitDialog() is not called?

transoft4-Jun-09 7:38

transoft

4-Jun-09 7:38

Yes, pAboutDialog->DoModal()will immediatelly return.

Re: OnInitDialog() is not called?

norish4-Jun-09 8:01

norish

4-Jun-09 8:01

Then problem is decided to initializing an instance.
All constructor of CAboutDialog, CDialogBase, CDialog are initializing correctly?
Are there some members not initilized or have invalid value?
You can check it by debug mode and step into function.

Re: OnInitDialog() is not called?

Stuart Dootson4-Jun-09 7:10

Stuart Dootson

4-Jun-09 7:10

transoft wrote:
DECLARE_MESSAGE_MAP( );

Did you do the BEGIN_MESSAGE_MAP()/END_MESSAGE_MAP() thing correctly? CDialogBase needs that...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: OnInitDialog() is not called?

transoft4-Jun-09 7:39

transoft

4-Jun-09 7:39

Yes, I did as following:

BEGIN_MESSAGE_MAP( CDialogBase, CDialog )
ON_COMMAND(IDHELP, CMHelp)
ON_WM_HELPINFO()
END_MESSAGE_MAP()

Re: OnInitDialog() is not called?

ChosenOne5-Jun-09 9:44

ChosenOne

5-Jun-09 9:44

you are missing the ON_WM_INITDIALOG in the message map.

Re: OnInitDialog() is not called?

David Crow4-Jun-09 10:23

David Crow

4-Jun-09 10:23

transoft wrote:
CAboutDialog *pAboutDialog = new CAboutDialog( .... ); ---> CAboutDialog is inherited from "CDialogBase "
pAboutDialog->DoModal();

Just out of curiosity, why not use:

CAboutDialog pAboutDialog;
pAboutDialog.DoModal();

Do you have any controls on CAboutDialog with associated member variables? Is DoDataExchange() correct? Have you tried adding the DS_NOFAILCREATE style?

"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: OnInitDialog() is not called?

Cristian Amarie4-Jun-09 18:31

Cristian Amarie

4-Jun-09 18:31

Most probably it fails during dialog construction (CreateDialogIndirect).
Invalid or changed IDD (rebuild needed?), ActiveX added in dialog but not (correctly) installed etc.
Or perhaps you are mapping in the same .exe multiple dlls and there is a clash between resource IDs?

BTW, why new CAboutDialog and not
[code]
CAboutDialog dlg;
dlg.DoModal();
[/code]

Nuclear launch detected

How to show a dialog box when some background processing started

pandit844-Jun-09 5:55

pandit84

4-Jun-09 5:55

How to show a Modal Dialog box while i am doing some manipulation to my data before showing it to a grid.
Do i have to start any thread for it .??

Or should I set any event for it..?

Re: How to show a dialog box when some background processing started

Code-o-mat4-Jun-09 6:02

Code-o-mat

4-Jun-09 6:02

I'd say your options are threads or idle-time processing depending on your needs and goals.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Create Process in background

krishnakumartm4-Jun-09 5:25

krishnakumartm

4-Jun-09 5:25

Hi,
I need to run a process without showing to user, in background,
The application is not a MFC it is normal command window application.
I tried the way like settinf the STARTUPINFO like SW_HIDE. But this is not working.

Can someone help me.

Thanks,

----------------------------
KRISHNA KUMAR T M

Re: Create Process in background

Uwe Keim4-Jun-09 5:29

Uwe Keim

4-Jun-09 5:29

As far as I know, a Console application always shows the console.

Try creating a windows application and hide the main window.

• My personal 24/7 webcam
• Zeta Test - Intuitive, competitive Test Management environment for Test Plans and Test Cases. Download now!
• Zeta Producer Desktop CMS - Intuitive, very easy to use. Download now!

Re: Create Process in background

krishnakumartm4-Jun-09 5:42

krishnakumartm

4-Jun-09 5:42

Why it is like that, is there any other way to hide the console.

----------------------------
KRISHNA KUMAR T M

Re: Create Process in background

krishnakumartm4-Jun-09 5:57

krishnakumartm

4-Jun-09 5:57

Hey i got it we can hide the cosole application also.
we have to fill the STARTINFO structure correctly
like

STARTUPINFO si;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);

//set the flags to tell application to use the startup info
si.dwFlags = STARTF_USESHOWWINDOW;
//set the window hide options.
si.wShowWindow = SW_HIDE;

Refere the link Running console applications silently

----------------------------
KRISHNA KUMAR T M

Re: Create Process in background

norish4-Jun-09 6:02

norish

4-Jun-09 6:02

This code can hide console window on my system (xp sp3).

STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
si.dwFlags  = STARTF_USESHOWWINDOW;
si.wShowWindow  = SW_HIDE;
if (CreateProcess(NULL, _T("cmd.exe"), NULL, NULL, FALSE, 0,
        NULL, NULL, &si, &pi)) {
    WaitForSingleObject(pi.hProcess, INFINITE);
    CloseHandle(pi.hThread);
    CloseHandle(pi.hProcess);
}

Re: Create Process in background

krishnakumartm4-Jun-09 6:13

krishnakumartm

4-Jun-09 6:13

Ya i got it.
Thanks for your response.

Thanks,

----------------------------
KRISHNA KUMAR T M

How to hook CBN_DROPDOWN and CBN_CLOSEUP ?

alikalik4-Jun-09 4:59

alikalik

4-Jun-09 4:59

Hello,
I've created a new class MyComboBox, derieved from CComboBox. I need to hook CBN_DROPDOWN and CBN_CLOSEUP messages and I do it in this way:

LRESULT MyComboBox::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
	switch(message)
	{
		case CBN_DROPDOWN:
			fn1();
			break; 
                case CBN_CLOSEUP:
                        fn2();
                        break;
	}
	
	return CComboBox::WindowProc(message, wParam, lParam);
}

But that doesn't work. What can cause the problem?

Re: How to hook CBN_DROPDOWN and CBN_CLOSEUP ?

norish4-Jun-09 5:10

norish

4-Jun-09 5:10

Check http://msdn.microsoft.com/en-us/library/aa921578.aspx[^]

Re: How to hook CBN_DROPDOWN and CBN_CLOSEUP ?

alikalik4-Jun-09 6:05

alikalik

4-Jun-09 6:05

LRESULT MyComboBox::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
	switch((int)LOWORD(wParam))
	{
		case CBN_DROPDOWN:
			fn1();
			break;
	}
	
	return CComboBox::WindowProc(message, wParam, lParam);
}

I tried this already, but the problem still exists Frown | :(

Re: How to hook CBN_DROPDOWN and CBN_CLOSEUP ?

norish4-Jun-09 6:50

norish

4-Jun-09 6:50

Have you read this part?

This message is sent when the list box of a combo box is about to be made visible. <br>The parent window of the combo box receives this message through the <code>WM_COMMAND</code> message.

Re: How to hook CBN_DROPDOWN and CBN_CLOSEUP ?

David Crow4-Jun-09 5:52

David Crow

4-Jun-09 5:52

Why are you not implementating handlers for CBN_DROPDOWN and CBN_CLOSEUP?

What version of Visual Studio are you using?

Re: How to hook CBN_DROPDOWN and CBN_CLOSEUP ?

alikalik4-Jun-09 5:57

alikalik

4-Jun-09 5:57

Visual Studio 2005 Standard Edition.

Identifying disconnecting clients.. TCP/IP Server created using CAsyncSocket

Shameer E.A.4-Jun-09 4:47

Shameer E.A.

4-Jun-09 4:47

Dear Techies,

I created a dialog based TCP/IP server using CAsycScoket to handle multiple clients. Things are fine when multiple clients connect and exchange data. I have the port nos and addresses of all the clients stored in a structure. (using ::GetPeerName())

But when a client gets disconnected, I can't identify which one got disconnected.

I know the framework calls ::OnClose() function when a client gets disconnected. But how do I identify the client which got disconnected?

Please help..

Thank you..

Re: Identifying disconnecting clients.. TCP/IP Server created using CAsyncSocket

norish4-Jun-09 5:35

norish

4-Jun-09 5:35

If client disconnect without shutdown call, server cannot detect the client disconnected unill tcp timeout.
To solve such that situation, need some techniques like;
1) let client always call shutdown
2) implement application level keep alive mechanism
3) implement server a polling to client after some interval from last client access
4) server force cut client after non transmission interval
...
Consider 1), 4) is most cost effective and 2), 3) makes increase packets.
Choose suitable method(s) to your system and application.

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