🔒 Locked

MFC issue

Started by CProgrammer Dec 27, 2003 at 11:11 PM 8 replies 250+ views

Original Post

113

Dec 27, 2003 at 11:11 PM

Ok, the following code just wont work. OnInitialUpdate is never called, eventhough I have overridden it as a virtual function: header:

#ifndef _CMain_H_
#define _CMain_H_

#include "StdAfx.h"

class CMain : public CView
{
public:
	CMain(CFrameWnd *FrameWnd);

private:

public:
	public:
	virtual void OnInitialUpdate();

};

#endif

cpp file

#include "CMain.h"

CMain::CMain(CFrameWnd *FrameWnd)
{
	//Erstellen des Fensters in unserem Rahmenfenster
	//''FrameWnd''.
	Create(0, 0, WS_CHILD | WS_VISIBLE, CRect(), FrameWnd, AFX_IDW_PANE_FIRST);
}

void CMain::OnInitialUpdate()
{
	CView::OnInitialUpdate();
	//Never called
}

-CProgrammer

Solo

Dec 27, 2003 at 11:33 PM

How are you attaching the view to the document?

CProgrammer

Author

113

CProgrammer

Dec 27, 2003 at 11:36 PM

I have a class derived from CFrameWnd with the following constructor:


CFrame::CFrame()
{
	Create(0, APP_NAME, WS_OVERLAPPEDWINDOW, rectDefault);

	main = new CMain(this);
}

Another derived class from CWinApp has the following function to create the CFrameWnd:


BOOL CWinAppd::InitInstance()
{
	CFrame *pMainWnd = new CFrame();

	m_pMainWnd = pMainWnd;

	m_pMainWnd->ShowWindow(m_nCmdShow);
	m_pMainWnd->UpdateWindow();

	return TRUE;
}

[edited by - CProgrammer on December 27, 2003 12:38:08 AM]

Solo

Dec 27, 2003 at 11:55 PM

Typically, documents are created using either CSingleDocTemplate or CMultiDocTemplate. The constructors for these classes take as parameters the object, view, and frame window, link them together, and in the process fires off events like OnInitialUpdate. If you're not doing this or manually calling the AddView() method from your document the View object isn't attached to a document so it's OnInitialUpdate handler never gets called.

[edited by - Solo on December 27, 2003 12:56:28 AM]

CProgrammer

Author

113

CProgrammer

Dec 28, 2003 at 12:22 AM

I see, thanks a bunch.
-CProgrammer

CProgrammer

Author

113

CProgrammer

Dec 28, 2003 at 12:25 AM

So all I need now is a class derived from CDocument. How would I attached that to my sampke?
-CProgrammer

CProgrammer

Author

113

CProgrammer

Dec 28, 2003 at 12:35 AM

No wait I think I got it.

-CProgrammer

CProgrammer

Author

113

CProgrammer

Dec 28, 2003 at 12:55 AM

Hmm i added this to InitInstance but it still dont work:


	CSingleDocTemplate* pDoc;
	pDoc = new CSingleDocTemplate(
		NULL,
		RUNTIME_CLASS(CDoc),
		RUNTIME_CLASS(CFrame),
		RUNTIME_CLASS(CMain));
	AddDocTemplate(pDoc);

Solo

Dec 29, 2003 at 4:59 PM

I suggest creating a new MFC project with all the single document model code in place. Then add your CMain implementation files to the project and replace all occurences of CView with CMain.

Also make sure your view window isn''t still trying to create the frame window.

And then of course, don''t forget that the document, view, and frame window (if MDI) will not be created until a new document is created via CWinApp::OnFileNew() or CWinApp::OnFileOpen().

CProgrammer

Author

113

CProgrammer

Dec 29, 2003 at 9:04 PM

Solo: Thanks for the tip but I found the problem:
It seems I didnt create a usable set of resources IDR_MAINFRAME and didnt ad these lines.


	CCommandLineInfo cmdInfo;
	ParseCommandLine(cmdInfo);
	if (!ProcessShellCommand(cmdInfo))
		return FALSE;

Thanks a bunch though, your tip about attaching the view to a document worked fine!
-CProgrammer

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.