C / C++ / MFC

HWND editSrc, editDst;
char *szBuffer;
int stringLength;

editSrc = GetDlgItem(dlg1, IDC_EDITBOX1);
editDst = GetDlgItem(dlg2, IDC_EDITBOX2);

stringLength = GetWindowTextLength(editSrc);
szBuffer = new char[stringLength+1];
ZeroMemory(szBuffer, stringLength+1);
GetWindowText(editSrc, szBuffer, stringLength);

SetWindowText(editDst, szBuffer);
delete szBuffer;

class CChildDialog : public CDialog
{
 public :
 CString m_strText;
}

void CMainDlg::OnClick_Button()
{
  
  CChildDialog oChildDlg; 
  oChildDlg.m_strText = strText; // This should be the edit box value
  oChildDlg.DoModal();
}

CChildDialog::OnInitDialog()
{
  SetDlgItemText(ID_OF_YOUR_EDIT, m_strText);
}

CChildDialog::CChildDialog(CString strText)

void mainform::OnBnClickedButton2()
{
			GetDlgItemText(IDC_EDIT1,newform.strtext);
}

BOOL newform::OnInitDialog()
{
			SetDlgItemText(IDC_EDIT1, strtext);
}

CMainDlg::OnButtonClick()
{
    CString strText;
    m_edit.GetWindowText(strText);
 
    CSecondDlg dlg;
    dlg.setData(strText);
 
    dlg.DoModal();
}
 
CSecondDlg::setData( LPCTSTR lpszText )
{
    m_strText = lpszText;
}
 
CSecondDlg:OnInitDialog()
{
    m_edit.SetWindowText(m_strText);
}

CFileDialog *pOpenDlg=new CFileDialog(FALSE,".txt",NULL,OFN_OVERWRITEPROMPT,"Text Files (*.txt)|*.txt|All Files(*.*)|*.*||");