MDI问题

[wangjs720]

是这样.在菜单中选择"打开",打开一个图片文件,调用CWinApp::OpenDocumentFile("...", FALSE),传递FALSE参数,是为了不打开新的子窗口,但这时已经打开了一个文档,只是将打开的图片柄保存在CDocument的一个成员变量中.并且在CView里也添加了绘制图像的代码.
问题是如何响应一个菜单命令,来打开一个子窗口来显示图片?
也不知道我说清楚没有.

[mintwlf]

确实没有说清楚，不懂！

[phoenix96_2000]

创建一个View
调用
CDocument::AddView
然后CDocument::UpdateAllViews

MSDN AddView的例子:SDI的,对MDI改一改应该也有用:

// The following example toggles two views in an SDI (single document
// interface) frame window. A design decision must be made as to
// whether to leave the inactive view connected to the document,
// such that the inactive view continues to receive OnUpdate
// notifications from the document. It is usually desirable to
// keep the inactive view continuously in sync with the document, even
// though it is inactive. However, doing so incurs a performance cost,
// as well as the programming cost of implementing OnUpdate hints.
// It may be less expensive, in terms of performance and/or programming,
// to re-sync the inactive view with the document only with it is
// reactivated. This example illustrates this latter approach, by
// reconnecting the newly active view and disconnecting the newly
// inactive view, via calls to CDocument::AddView and RemoveView.

BOOL CMainFrame::OnViewChange(UINT nCmdID)
// There is an ON_COMMAND_RANGE message map entry associated with
// OnViewChange:
// ON_COMMAND_RANGE( ID_VIEW_VIEW1, ID_VIEW_VIEW2, OnViewChange)
{
CView* pViewAdd;
CView* pViewRemove;
CDocument* pDoc = GetActiveDocument();

if((nCmdID == ID_VIEW_VIEW1) && (m_currentView == 1))
return;
if((nCmdID == ID_VIEW_VIEW2) && (m_currentView == 2))
return;

if (nCmdID == ID_VIEW_VIEW2)
{
if (m_pView2 == NULL)
{
m_pView1 = GetActiveView();
m_pView2 = new CMyView2;

//Note that if OnSize has been overridden in CMyView2
//and GetDocument() is used in this override it can
//cause assertions and, if the assertions are ignored,
//cause access violation.

m_pView2->Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,
rectDefault, this, AFX_IDW_PANE_FIRST + 1, NULL);
}
pViewAdd = m_pView2;
pViewRemove = m_pView1;
m_currentView= 2;
}
else
{
pViewAdd = m_pView1;
pViewRemove = m_pView2;
m_currentView= 1;
}

// Set the child i.d. of the active view to AFX_IDW_PANE_FIRST,
// so that CFrameWnd::RecalcLayout will allocate to this
// "first pane" that portion of the frame window's client area
// not allocated to control bars. Set the child i.d. of the
// other view to anything other than AFX_IDW_PANE_FIRST; this
// examples switches the child id's of the two views.

int nSwitchChildID = pViewAdd->GetDlgCtrlID();
pViewAdd->SetDlgCtrlID(AFX_IDW_PANE_FIRST);
pViewRemove->SetDlgCtrlID(nSwitchChildID);

// Show the newly active view and hide the inactive view.

pViewAdd->ShowWindow(SW_SHOW);
pViewRemove->ShowWindow(SW_HIDE);

// Connect the newly active view to the document, and
// disconnect the inactive view.
pDoc->AddView(pViewAdd);
pDoc->RemoveView(pViewRemove);

SetActiveView(pViewAdd);
RecalcLayout();
}

[菜牛]

没有。


CWinApp::OpenDocumentFile

virtual CDocument* OpenDocumentFile(
LPCTSTR lpszFileName
);
没看到你说的FALSE参数啊。