Question

我创建了一个窗口并在该父窗口中嵌入了一个CAxWindow。

当我创建主窗口时，我也创建了CAxWindow窗口。 NOw的问题是我在主窗口中添加了WM_WINDOWPOSCHANGING消息并且它被连续调用。最初使用右坐标值调用它，但经过一段时间后，它被称为机智x = 0，y = 0，宽度和高度= 0.

为什么会发生这种情况？

如果我在OnWindowPosChanging中放置断点，我可以看到pwp-＆gt; x = 0，pwp-＆gt; y = 0，pwp-＆gt; cx = 0，pwp-＆gt; cy = 0

这是代码

#include <atlbase.h>
#include <atlwin.h>
#include <atlcom.h>
CComModule _Module;

// To create an ATL window, begin by deriving from CWindowImpl<>.
class CMainWindow : public CWindowImpl<CMainWindow, CWindow,
     CWinTraits<WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE, 0 > >
{
public:
     CMainWindow(const RECT rect);
     virtual ~CMainWindow();
     // Enable a table driven WndProc.
     BEGIN_MSG_MAP(CMainWindow)
         MESSAGE_HANDLER(WM_PAINT, OnPaint)
         MESSAGE_HANDLER(WM_MOUSEMOVE,OnMouseMove)
         MESSAGE_HANDLER(WM_SETFOCUS,OnSetFocus)
         MESSAGE_HANDLER(WM_KILLFOCUS,OnKillFocus)
         MESSAGE_HANDLER(WM_CREATE,OnCreate)
         MESSAGE_HANDLER(WM_WINDOWPOSCHANGING, OnWindowPosChanging)
     END_MSG_MAP()
       LRESULT OnPaint(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
       LRESULT OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
       LRESULT OnSetFocus(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
       LRESULT OnKillFocus(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
       LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
       LRESULT OnWindowPosChanging(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);


private:
    CAxWindow m_wndIE;
    RECT m_Rect;
};
LRESULT CMainWindow ::OnWindowPosChanging(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    WINDOWPOS* pwp= (WINDOWPOS*)lParam;
    if (pwp)
    {
        m_wndIE.SetWindowPos(NULL, pwp->x, pwp->y, pwp->cx, pwp->cy, SWP_SHOWWINDOW | SWP_NOMOVE | SWP_NOZORDER |SWP_NOCOPYBITS);
    }

    bHandled= FALSE;
    return 0;
}

LRESULT CMainWindow::OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    m_wndIE.Create(m_hWnd, m_Rect, NULL, WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS | WS_TABSTOP |WS_BORDER);
    m_wndIE.CreateControl(L"{8856F961-340A-11D0-A96B-00C04FD705A2}", NULL, NULL);


    bHandled = false;
    return 0;
}

// Paint some centered text into the client area.
LRESULT CMainWindow:: OnSetFocus(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{

    bHandled = false;
    return 0;
}
// Paint some centered text into the client area.
LRESULT CMainWindow:: OnKillFocus(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{

    bHandled = false;
    return 0;
}
// Paint some centered text into the client area.
LRESULT CMainWindow:: OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    //MessageBox("OnMouseMove","",MB_OK);
    bHandled = false;
    return 0;
}

// Paint some centered text into the client area.
LRESULT CMainWindow:: OnPaint(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
     // This example makes use of a number of Win32 API calls.
     // See online help (if necessary).
     PAINTSTRUCT ps;
     BeginPaint(&ps);
     HDC hDC = GetDC();
     RECT r;
     GetClientRect(&r);
     DrawText(hDC, "My ATL Window", -1, &r, DT_SINGLELINE |
             DT_VCENTER | DT_CENTER);
     EndPaint(&ps);
     ReleaseDC(hDC);
     return 0;
}

// Create and destroy this window.
CMainWindow::CMainWindow(const RECT rect)
{
    CopyRect(&m_Rect,&rect);
 //    // Create my window.
    //RECT rc= {10, 10, 200, 200};
 //    Create(NULL, rc, "My ATL Window");
 //    ShowWindow(SW_SHOWNORMAL);
}


CMainWindow::~CMainWindow()
{
    /* if(m_hWnd)
          DestroyWindow();*/
}
//CMainWindow theWind;

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst,
                PSTR szCommand, int iShow)
{
    _Module.Init(NULL,hInst);
    RECT rect={ 200,200,300,300};
    CMainWindow mw(rect);
    mw.Create(NULL,rect,_T("MyWindow"),
        WS_OVERLAPPEDWINDOW | WS_VISIBLE);

    MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }


    _Module.Term();
return 0;
}

Answer 1

这一行

m_wndIE.SetWindowPos(NULL, pwp->x, pwp->y, pwp->cx, pwp->cy, SWP_SHOWWINDOW | SWP_NOMOVE | SWP_NOZORDER |SWP_NOCOPYBITS);

看起来非常可疑。 WM_WINDOWPOSCHANGING将发送给您，以允许您的窗口否决可能的移动。转发邮件几乎肯定会导致您的孩子IE窗口移出框架。

MSDN对标志有简单的描述。

窗口不断得到WM_WINDOWPOSCHANGING

1 个答案: