Visual C++ :: Splitting Child Window In MFC MDI Program?

how to split a child window in an MFC MDI program.

Splitting Child Window in MFC MDI Program

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For my purposes, this achievement is practically useless because I cannot find a way to pass text from one CRichEditView window to another.

Given two CRichEditView windows, CInputViewView and COutputView as child windows in an MFC MDI app, my goal is to capture text in the former and print that text in the later using a button click.

Using what appeared to me to be a logical way to proceed, I tried variations of the following code:

Code:
void CMainFrame::DoSomething() {
//MessageBox(_T("Like What ?"), _T("Do Something"));
//CInputViewView * pin = (CInputViewView*) GetActiveView();
CInputViewView * pin = (CInputViewView*)m_wndSplitter.GetPane(0,0);
pin->GetWindowTextW(m_csDisplay);

[Code] ....

None of this works and even the attempt to access the pane results in an app crash in winsplit.cpp.

Code:
#ifdef _DEBUG
void CSplitterWnd::AssertValid() const {
CWnd::AssertValid();
>ASSERT(m_nMaxRows >= 1);
//..