Re: Want to solve: Warning: Creating a pane with no CDocument

From:

Eric Lilja <mindcoolerremoveme@gmail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 18 May 2007 23:52:18 +0200

Message-ID:

<epjXNbZmHHA.2272@TK2MSFTNGP02.phx.gbl>

AliR (VC++ MVP) wrote:

Are you creating a CSingleDocTemplate object and calling AddDocTemplate in
your application class InitInstance method?

Yes, here's my InitInstance():
#define ID_MAINFRAME 4711

Application application_instance;

BOOL Application::InitInstance()
{
    CSingleDocTemplate *csdt =
       new CSingleDocTemplate(ID_MAINFRAME, RUNTIME_CLASS(MyDocument),
RUNTIME_CLASS(FrameWindow), RUNTIME_CLASS(FrameView));

    ASSERT(csdt);

    AddDocTemplate(csdt);

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

    m_pMainWnd->ShowWindow(m_nCmdShow);

    return TRUE;
}

AliR.

"Eric Lilja" <mindcoolerremoveme@gmail.com> wrote in message
news:uN9VjLZmHHA.3704@TK2MSFTNGP02.phx.gbl...

AliR (VC++ MVP) wrote:

What's the value of pContext->m_pCurrentDoc in your OnCreateClient?

AliR.

Thanks for your reply. pContext is NULL in OnCreateClient(). So not just
pContext->m_pCurrentDoc is NUll, pContext itself is NULL. I noticed this
when I tried to use CSplitterWnd::Create() instead of
CSplitterWnd::CreateStatic. Hmm.

- Eric

"Eric Lilja" <mindcoolerremoveme@gmail.com> wrote in message
news:%23lYXczYmHHA.4772@TK2MSFTNGP05.phx.gbl...

Hello, I have doc-view program (SDI-type). My frame window class creates
a CSplitterWnd with two panes. I'm getting the message in the subject
when creating the pane views: Warning: Creating a pane with no
CDocument. What have I done wrong? I've cut down the implementation of
my frame window to:
FrameWindow.h:
#pragma once

#include "stdafx.h"

class FrameWindow : public CFrameWnd
{
public:
   FrameWindow();

protected:
   virtual BOOL LoadFrame(UINT, DWORD, CWnd *, CCreateContext *);

   virtual BOOL OnCreateClient(LPCREATESTRUCT, CCreateContext *);

   DECLARE_DYNCREATE(FrameWindow)

private:
   /* The docs say: A CSplitterWnd object is usually embedded in a
      parent CFrameWnd or CMDIChildWnd object. */
   CSplitterWnd splitter_;
};

FrameWindow.cpp:
#include "FrameWindow.h"
#include "WindowView.h"

IMPLEMENT_DYNCREATE(FrameWindow, CFrameWnd)

FrameWindow::FrameWindow()
{
   VERIFY(Create(NULL, _T("Show Styles"), WS_OVERLAPPEDWINDOW, CRect(10,
10, 1024, 768)));
}

BOOL
FrameWindow::LoadFrame(UINT nIDResource, DWORD dwDefaultStyle, CWnd
*pParentWnd, CCreateContext *pContext)
{
   /* If we execute CFrameWnd::LoadFrame() the program becomes very
unhappy... */
   return TRUE;
}

BOOL
FrameWindow::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext
*pContext)
{
   const int rows = 1;
   const int columns = 2;

   /* A CSplitterWnd should be created in OnCreateClient() according to
the docs. */
   VERIFY(splitter_.CreateStatic(this, rows, columns));

   CRect rect;

   GetClientRect(rect);

   /* row = 0, column = 0 */
   VERIFY(splitter_.CreateView(0, 0, RUNTIME_CLASS(WindowView),
CSize(rect.right - 400, 0), pContext));
   /* row = 0, column = 1 */
   VERIFY(splitter_.CreateView(0, 1, RUNTIME_CLASS(WindowView),
CSize(rect.right - (rect.right - 400), 0), pContext));

   return TRUE;
}

As you can see I'm using the same view for each pane right now, that
will change when I get this problem sorted. WindowView is very simple,
nothing added at all at the moment. This practically my first docview
program so I guess it's something simple. Hope I posted enough
information. Running MSVC++ 8.0 SP1 on fully patched WinXP Pro.

- Eric