无法获取可停靠窗格 C++ 的句柄

Question

我通过 MFC 向导创建了一个基于 MFC 应用程序的多文档功能区。我正在尝试获取 m_wndFileView 的句柄以更新其视图。我知道有几种方法可以做到这一点，但我不明白为什么我使用的方法不起作用。即将开始

class CMainFrame : public CMDIFrameWndEx
{
    ...
    CFileView         m_wndFileView;
    CPropertiesWnd    m_wndProperties;
    ...
}

class CFileView : public CDockablePane
{
    ...
    protected:
        CViewTree m_wndFileView;
    ...
};

class CPropertiesWnd : public CDockablePane
{
    ...
    protected:
        CMFCPropertyGridCtrl m_wndPropList;
    ...
};

主框架是从MAINAPPLICATION.cpp

创建的

// create main MDI Frame window
CMainFrame* pMainFrame = new CMainFrame;
if (!pMainFrame || !pMainFrame->LoadFrame(IDR_MAINFRAME))
{
    delete pMainFrame;
    return FALSE;
}
m_pMainWnd = pMainFrame;

// call DragAcceptFiles only if there's a suffix
//  In an MDI app, this should occur immediately after setting m_pMainWnd
// Enable drag/drop open
m_pMainWnd->DragAcceptFiles();

// Parse command line for standard shell commands, DDE, file open
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);

// Enable DDE Execute open
EnableShellOpen();
RegisterShellFileTypes(TRUE);


// Dispatch commands specified on the command line.  Will return FALSE if
// app was launched with /RegServer, /Register, /Unregserver or /Unregister.
if (!ProcessShellCommand(cmdInfo))
    return FALSE;
// The main window has been initialized, so show and update it
pMainFrame->ShowWindow(m_nCmdShow);
pMainFrame->UpdateWindow();

MainFrm.cpp 创建这两个窗格：

// Create file view
CString strFileView;
bNameValid = strFileView.LoadString(IDS_FILE_VIEW);
ASSERT(bNameValid);
if (!m_wndFileView.Create(strFileView, this, CRect(0, 0, 200, 200), TRUE, ID_VIEW_FILEVIEW, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | CBRS_LEFT| CBRS_FLOAT_MULTI))
{
    TRACE0("Failed to create File View window\n");
    return FALSE; // failed to create
}


// Create properties window
CString strPropertiesWnd;
bNameValid = strPropertiesWnd.LoadString(IDS_PROPERTIES_WND);
ASSERT(bNameValid);
if (!m_wndProperties.Create(strPropertiesWnd, this, CRect(0, 0, 200, 200), TRUE, ID_VIEW_PROPERTIESWND, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | CBRS_RIGHT | CBRS_FLOAT_MULTI))
{
    TRACE0("Failed to create Properties window\n");
    return FALSE; // failed to create
}

从MAINAPPLICATION.cpp开始，我可以通过

访问属性面板

CWnd * pwnd = ((CWnd*)(AfxGetApp()->m_pMainWnd));
CPropertiesWnd * pPropertiesWnd = (CPropertiesWnd*)pwnd->GetDlgItem(ID_VIEW_PROPERTIESWND);
CMFCPropertyGridCtrl * m_wndPropList = (CMFCPropertyGridCtrl *)pPropertiesWnd->GetDlgItem(2);

但由于某些原因，我无法使用

访问文件视图窗格

CWnd * pwnd = ((CWnd*)(AfxGetApp()->m_pMainWnd));
CFileView * pFileViewWnd = (CFileView*)pwnd->GetDlgItem(ID_VIEW_FILEVIEW);
CViewTree * m_wndFileView= (CViewTree*)pFileViewWnd ->GetDlgItem(4);

(CFileView*)pwnd->GetDlgItem(ID_VIEW_FILEVIEW); returns 空

请帮忙。这真让我抓狂。最后我可以修改 m_wndPropList 但不能修改 m_wndFileView 因为我无法获得 pFileViewWnd 的句柄。不能以相同的方式访问以相同方式创建的两个窗格。为什么？如果需要更多代码，请告诉我。谢谢。

Answer 1

所以@MarkRansom 确实帮助了间谍 ++ 的想法。为了获得句柄，我必须执行以下操作：

// get CWnd to main window
CWnd * pwnd = ((CWnd*)(AfxGetApp()->m_pMainWnd));
// from spy++ i found that the tabbed panes were in a window called
// "File View" so i found a child window with that title
HWND h = FindWindowExW(pwnd->GetSafeHwnd(), NULL, NULL, L"File View");
// casted it to a tabbedpane pointer
CTabbedPane * pFileViewWn = (CTabbedPane *)CWnd::FromHandle(h);
// mfc wizard did what seems to me as weird naming. to find the docking 
// panes i did the same as above but there was no title to this window
HWND hh = FindWindowExW(pFileViewWn->GetSafeHwnd(), NULL, NULL, L"");
// casted that
CDockablePane* pTabbedBar = (CDockablePane*)CWnd::FromHandle(hh);
// was able to find my specific docking pane using a resource id
CFileView * pFileViewWnd = (CFileView*)pTabbedBar->GetDlgItem(ID_VIEW_FILEVIEW);
// was able to find the control i wanted to use using a resource id
CViewTree * m_wndFileView = (CViewTree *)pFileViewWnd->GetDlgItem(4);

HTREEITEM hRoot = m_wndFileView->GetRootItem();

m_wndFileView->InsertItem(name, 2, 2, hRoot);

通过代码我认为逻辑是

tabbed pane
    File View Dockable Pane
        File View controls
    Class View Dockable Pane
        Class View controls

但不知何故，另一个 window 滑入

tabbed pane
    MYSTERY DOCKABLE WINDOW
        File View Dockable Pane
            File View controls
        Class View Dockable Pane
            Class View controls

Answer 2

您应该像这样在 CMainFrame class 中创建内联 getter：

CFileView& GetFileViewPane()
{
  return m_wndFileView;
}

CPropertiesWnd& GetPropsPane()
{
  return m_wndProperties;
}

之后，您可以像这样访问那些 windows：

CMainFrame* pMainFrame = DYNAMIC_DOWNCAST(CMainFrame, AfxGetMainWnd());
if (pMainFrame && pMainFrame->GetSafeHwnd()) // sanity check
{
  pMainFrame->GetFileViewPane().DoStuff();
}

无法获取可停靠窗格 C++ 的句柄

Having trouble getting a handle to a Dockable Pane C++

c++

mfc