C / C++ / MFC

6-May-03 11:43

I have a single document interface application. Its base class is CFormView. I've added a CTreeCtrl to it just like I would in a dialog based application. I've given the tree control an Id and I've created a variable of type CTreeCtrl. However, when I try to use it my application crashes. Its seems that my tree control has not been initialized... Cry | :((

this->m_ctrlSetupTree {CTreeCtrl hWnd=0x00000000} Dead | X|

valikac6-May-03 12:46

valikac

6-May-03 12:46

The the code that creates the CTreeCtrl object, i.e. Create().

Kuphryn

adonisv6-May-03 13:35

6-May-03 13:35

How do I get the parent CWnd* pParentWnd? OMG | :OMG:

BOOL Create( DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID );

valikac6-May-03 16:16

valikac

6-May-03 16:16

Call GetParent().

Kuphryn

Tibor Blazko6-May-03 23:57

Tibor Blazko

6-May-03 23:57

isn't it your view? this (or similar)
t!

Michael Dunn6-May-03 17:27

Michael Dunn

6-May-03 17:27

Are you calling InitCommonControls()?

--Mike--
Eh! Steve!
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Chris Richardson6-May-03 18:21

6-May-03 18:21

I would bet you are trying to use it before the tree control has been created. Are you trying to access the tree control in a WM_SIZE handler? If so, it won't be created the first couple times the WM_SIZE handler gets called. Usually, the fix for this is something like this:

if( !IsWindow( m_YourTreeCtrl ) )
   return;

// Here, m_YourTreeCtrl can be accessed safely.

However, if you are trying to access the tree in a function that's only called once (say, for initialization), then you'll have to put the initialization code in some other function that's called later on.

Chris Richardson
Terrain Software

adonisv7-May-03 10:23

7-May-03 10:23

I'm calling the following code. But it seems that my hWnd is still null.

CRect treeRect;
treeRect.NormalizeRect();
CImageList *pImageList=new CImageList;
	
	
if(this->m_ctrlSetupTree.Create(WS_VISIBLE,treeRect,this,IDC_SETUP_TREE))
	{
		Beep(999,99);
		int i, icons=0;
		for (icons=0; RCanalTree::m_icons[icons]; icons++) {}
		pImageList->Create(16, 16, TRUE, icons,6);
		for (i=0; RCanalTree::m_icons[i]; i++)
		{
			pImageList->Add(AfxGetApp()->LoadIcon(RCanalTree::m_icons[i]));
		}
		// Assign the image list to all list and tree controls
		// so that icons can be used.	
		m_ctrlSetupTree.SetImageList(pImageList,TVSIL_NORMAL);
		
		// Instruct the Canal Manager to create a new system based on the information
		// in the Canal Structures database.
		
		
		if(this->m_oCanalManager.CreateNewDataStructures())
		{
			// Based on the data structures created in memory by the Canal Manager,
			// populate the setup tree.
			//this->m_ctrlSetupTree.Populate();
		}
		
	}
}

Chris Richardson7-May-03 10:33

7-May-03 10:33

Your control is failing to be created because you haven't specified the WS_CHILD style. Here's the correct line of code:

if(this->m_ctrlSetupTree.Create(WS_CHILD|WS_VISIBLE,treeRect,this,IDC_SETUP_TREE))
{
   ..... snip .....
}

Chris Richardson
Terrain Software

adonisv7-May-03 11:11

7-May-03 11:11

Hmmmm...Create still returned zero.. Frown | :(

CTreeCtrl::Create returned 0

if(this->m_ctrlSetupTree.Create(WS_CHILD|WS_VISIBLE|TVS_HASLINES,treeRect,this,IDC_SETUP_TREE))

Chris Richardson7-May-03 11:16

7-May-03 11:16

Has the window referred to by "this" been created at the point you are calling Create? That's my only guess as to why it would still be failing.

Chris Richardson
Terrain Software

adonisv8-May-03 14:42

8-May-03 14:42

Hmmm.... good point. Cool | :cool:

Exactly when in the "window" created in an SDI application with formView as the base class??? Laugh | :laugh:

Chris Richardson8-May-03 15:52

8-May-03 15:52

Well I'm not sure of the exact message sequence. Why don't you post the relevant code for the formview derived class, and then I'll tell you if the window has been created. Or at least, tell which function you have put the tree creation code in.

Chris Richardson
Terrain Software

Wow I got it workin'!!!

adonisv8-May-03 18:29

8-May-03 18:29

Actually, all I needed to do was move my code into the OnInitialUpdate function. I didn't need to call create!

void CSacmanSetupApplicationView::OnInitialUpdate()
{
	CFormView::OnInitialUpdate();
	GetParentFrame()->RecalcLayout();
	ResizeParentToFit();

		// Build the image list which will hold the icons
	// we want to use in the lists and trees.

	CRect treeRect;
	CImageList *pImageList=new CImageList;	
	My object is fine at this point	
		if(this->m_ctrlSetupTree)
		{
			
			Beep(999,99);
			int i, icons=0;
			for (icons=0; RCanalTree::m_icons[icons]; icons++) {}
			pImageList->Create(16, 16, TRUE, icons,6);
			for (i=0; RCanalTree::m_icons[i]; i++)
			{
				pImageList->Add(AfxGetApp()->LoadIcon(RCanalTree::m_icons[i]));
			}
			// Assign the image list to all list and tree controls
			// so that icons can be used.	
			m_ctrlSetupTree.SetImageList(pImageList,TVSIL_NORMAL);
			
			// Instruct the Canal Manager to create a new system based on the information
			// in the Canal Structures database.
			
Had to make sure it was displaying an object with data in it..	

m_ctrlSetupTree.SetCanalManagerPointer(this->m_oCanalManager.GetCanalManager());

Thanks for the help! Big Grin | :-D

parameter of glutInit

aguest6-May-03 10:33

aguest

6-May-03 10:33

hello
i have a problem with "glutInit (&argc, argv)" it's an API of "glut" lib ,and
my problem are with the 2 parameter of glutInit ;i have made an MFC application and
i use glutInit ,like this :
void initializeGraphics (int argc, char **argv)
{
// initialize GLUT state based on command line arguments
glutInit (&argc, argv);

.....
.....
.....

}
but when i compile it said me that the 2 parameter are undeclared.
how i can resolve this problem,or modified the code ?

Joaquín M López Muñoz6-May-03 11:11

Joaquín M López Muñoz

6-May-03 11:11

Non-console apps (like MFC ones) are not provided these parameters. Fortunately for you, MSVC features the global variables __argc and __argv which you can use instead.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

aguest6-May-03 11:38

aguest

6-May-03 11:38

thank you
but how i can use this globale variable __argc and __argv,because i am new in vc++ and programation.

Joaquín M López Muñoz6-May-03 12:05

Joaquín M López Muñoz

6-May-03 12:05

It'd be something like

void initializeGraphics (int argc, char **argv)
{
...
// initialize GLUT state based on command line arguments
glutInit (&argc, argv); 
...
}
...
initializeGraphics(__argc,__argv);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo