Programming Forums > Application Development > C++

Nellie · Jun 4th, 2005, 2:45 PM

I wanted to make a dialog open when the app started a loop, and close it when the loop completes. (like the example at the top of this thread).

I have checked the web, but most just confuse me even more.

kirkl_uk · Jun 4th, 2005, 5:59 PM

I've just dug out the assignment I mentioned above. It contains a modeless dialog using MFC, as this was one of the assessment areas for the assignment.

There are a few things you need to do for the modeless dialog, that I can show you here:

First, you need a class for the dialog itself, which contains:

1. A pointer to its parent. (For example, a view.)
I did this by adding a CView* to the dialog's constructor.
2. A Create() override method, to create the actual dialog, as follows:

(Toggle Plain Text)

BOOL CModelessDlg::Create()
{
	// Create the dialog.
	return CDialog::Create(CModelessDlg::IDD, m_pParent);
	// Where m_pParent is the CView* passed to the constructor.
}

3. A PostNcDestroy() override method, as follows:

(Toggle Plain Text)

void CModelessDialog::PostNcDestroy() 
{
	// Delete the dialog.
	delete this;
	
	CDialog::PostNcDestroy();
}

4. An OnClose() override.

(Toggle Plain Text)

void CModelessDlg::OnClose() 
{
	// Set the parent's dialog pointer to NULL.
	((CWhatever*)m_pParent)->m_pModelessDlg = NULL;
	// Destroy the window.
	DestroyWindow();	
}

Then, in your parent class, you will need:

1. A pointer to the dialog, such as:

(Toggle Plain Text)

CModelessDialog* m_pModelessDlg;

2. A function for creating, or "switching to" the modeless dialog:

(Toggle Plain Text)

void CWhatever::OnShowModelessDlg() 
{
	if(!m_pModelessDlg)
	{
		// Create the dialog.
		m_pModelessDlg = new CModelessDlg(this);
		m_pModelessDlg->Create();
	}
	else
		// Set the dialog active.
		m_pModelessDlg->SetActiveWindow();	
}

I hope that helps, but I know it's hard to understand if you are new to MFC. I'll try and answer any questions that you may have.

kirkl_uk

PS: Sorry this is such a long post. Give those scrolling muscles some action tho eh!?

Nellie · Jun 5th, 2005, 5:22 AM

I make a new class when i put the dialog in, the class manager (or whatever its called?) comes up and asks if i want to make a new class for it.

How exactly do i make a pointer?
(i have herd about them, but never (knowingly :o ) used one.)
is the CView* the pointer?

The only bit that i can read through in my mind without thinking 'what the...'

is the last bit of code (except the '->')

(Toggle Plain Text)

if(!m_pModelessDlg)
	{
		// Create the dialog.
		m_pModelessDlg = new CModelessDlg(this);
		m_pModelessDlg->Create();
	}
	else
		// Set the dialog active.
		m_pModelessDlg->SetActiveWindow();

thanks

kirkl_uk · Jun 5th, 2005, 5:56 AM

Is this part of an assignment, or something you are doing for yourself? If it's not an assignment, I reccommend you go through standard C++ first to learn about things such as pointers.

kirkl_uk

iignotus · Jun 5th, 2005, 9:29 AM

Quote:

Originally Posted by uman

Nellie: your sig should say "members who consisted of a large portion..." you're using "whom" incorrectly.

Just wanted to let you know.

Well, if you want to be pedantic, he's improperly using that second comma as well as 'consisted'. But, pedanticism never got anyone anywhere

Nellie · Jun 5th, 2005, 11:48 AM

its not part of an assignment, i do all this for my own learning.

i have a basic understanding of cpp, but having never had to use pointers, never lernt about them, or how to implement. (although i probably have used them, but in an example code i found).

(is this thread about modeless CDialog's or my sig?)

kirkl_uk · Jun 5th, 2005, 1:13 PM

Here's an introduction to pointers:

http://www.cprogramming.com/tutorial/lesson6.html

kirkl_uk

Jun 4th, 2005, 2:45 PM	#11
Nellie Programmer Join Date: Jun 2005 Location: Kent (old) England Posts: 34 Rep Power: 0	I wanted to make a dialog open when the app started a loop, and close it when the loop completes. (like the example at the top of this thread). I have checked the web, but most just confuse me even more. __________________ I use MSVC6.0, on XP Pro Happy Programming :D http://www.danasoft.com/sig/NelliesSig.jpg

Jun 4th, 2005, 5:59 PM	#12
kirkl_uk Programmer Join Date: Apr 2005 Location: England Posts: 86 Rep Power: 4	I've just dug out the assignment I mentioned above. It contains a modeless dialog using MFC, as this was one of the assessment areas for the assignment. There are a few things you need to do for the modeless dialog, that I can show you here: First, you need a class for the dialog itself, which contains: 1. A pointer to its parent. (For example, a view.) I did this by adding a CView* to the dialog's constructor. 2. A Create() override method, to create the actual dialog, as follows: (Toggle Plain Text) BOOL CModelessDlg::Create() { // Create the dialog. return CDialog::Create(CModelessDlg::IDD, m_pParent); // Where m_pParent is the CView* passed to the constructor. } BOOL CModelessDlg::Create() { // Create the dialog. return CDialog::Create(CModelessDlg::IDD, m_pParent); // Where m_pParent is the CView* passed to the constructor. } 3. A PostNcDestroy() override method, as follows: (Toggle Plain Text) void CModelessDialog::PostNcDestroy() { // Delete the dialog. delete this; CDialog::PostNcDestroy(); } void CModelessDialog::PostNcDestroy() { // Delete the dialog. delete this; CDialog::PostNcDestroy(); } 4. An OnClose() override. (Toggle Plain Text) void CModelessDlg::OnClose() { // Set the parent's dialog pointer to NULL. ((CWhatever)m_pParent)->m_pModelessDlg = NULL; // Destroy the window. DestroyWindow(); } void CModelessDlg::OnClose() { // Set the parent's dialog pointer to NULL. ((CWhatever)m_pParent)->m_pModelessDlg = NULL; // Destroy the window. DestroyWindow(); } Then, in your parent class, you will need: 1. A pointer to the dialog, such as: (Toggle Plain Text) CModelessDialog* m_pModelessDlg; CModelessDialog* m_pModelessDlg; 2. A function for creating, or "switching to" the modeless dialog: (Toggle Plain Text) void CWhatever::OnShowModelessDlg() { if(!m_pModelessDlg) { // Create the dialog. m_pModelessDlg = new CModelessDlg(this); m_pModelessDlg->Create(); } else // Set the dialog active. m_pModelessDlg->SetActiveWindow(); } void CWhatever::OnShowModelessDlg() { if(!m_pModelessDlg) { // Create the dialog. m_pModelessDlg = new CModelessDlg(this); m_pModelessDlg->Create(); } else // Set the dialog active. m_pModelessDlg->SetActiveWindow(); } I hope that helps, but I know it's hard to understand if you are new to MFC. I'll try and answer any questions that you may have. kirkl_uk PS: Sorry this is such a long post. Give those scrolling muscles some action tho eh!? Last edited by kirkl_uk; Jun 4th, 2005 at 6:02 PM.

Jun 5th, 2005, 5:22 AM	#13
Nellie Programmer Join Date: Jun 2005 Location: Kent (old) England Posts: 34 Rep Power: 0	I make a new class when i put the dialog in, the class manager (or whatever its called?) comes up and asks if i want to make a new class for it. How exactly do i make a pointer? (i have herd about them, but never (knowingly :o ) used one.) is the CView* the pointer? The only bit that i can read through in my mind without thinking 'what the...' is the last bit of code (except the '->') (Toggle Plain Text) if(!m_pModelessDlg) { // Create the dialog. m_pModelessDlg = new CModelessDlg(this); m_pModelessDlg->Create(); } else // Set the dialog active. m_pModelessDlg->SetActiveWindow(); if(!m_pModelessDlg) { // Create the dialog. m_pModelessDlg = new CModelessDlg(this); m_pModelessDlg->Create(); } else // Set the dialog active. m_pModelessDlg->SetActiveWindow(); thanks __________________ I use MSVC6.0, on XP Pro Happy Programming :D http://www.danasoft.com/sig/NelliesSig.jpg Last edited by Nellie; Jun 5th, 2005 at 5:26 AM.

Jun 5th, 2005, 11:48 AM	#16
Nellie Programmer Join Date: Jun 2005 Location: Kent (old) England Posts: 34 Rep Power: 0	its not part of an assignment, i do all this for my own learning. i have a basic understanding of cpp, but having never had to use pointers, never lernt about them, or how to implement. (although i probably have used them, but in an example code i found). (is this thread about modeless CDialog's or my sig?) __________________ I use MSVC6.0, on XP Pro Happy Programming :D http://www.danasoft.com/sig/NelliesSig.jpg

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Jun 5th, 2005, 5:56 AM	#14
kirkl_uk Programmer Join Date: Apr 2005 Location: England Posts: 86 Rep Power: 4	Is this part of an assignment, or something you are doing for yourself? If it's not an assignment, I reccommend you go through standard C++ first to learn about things such as pointers. kirkl_uk

Jun 5th, 2005, 1:13 PM	#17
kirkl_uk Programmer Join Date: Apr 2005 Location: England Posts: 86 Rep Power: 4	Here's an introduction to pointers: http://www.cprogramming.com/tutorial/lesson6.html kirkl_uk

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