如何使用GetTopWindow?

[czhsdhs]

在一个多文档应用程序中，能用GetTopWindow得到CMainFrame的子窗口吗？如何去的到呢？能不能详细说说GetTopWindow的用法。MSDN中的意思不是很明白。谢谢。

[DentistryDoctor]

GetTopWindow得到是Z-Order在前的第一个子窗口。

[lzzqqq]

CMainFrame* pFrm=(CMainFrame*)AfxGetApp()->m_pMainWnd;
if (pFrm==NULL)
return;
pFrm->GetActiveFrame();//这里就得到了child frame了。

[DentistryDoctor]

...
if ( !lstrcmpi( szBuf, _T( "ComboBox" ) ) )
{
// Special case for simple comboboxes
if ( ( dwStyle & 0x03 ) == CBS_SIMPLE )
{
hWnd = GetTopWindow( hWnd );
while ( hWnd )
{
AddControl( hWnd );
hWnd = GetNextWindow( hWnd, GW_HWNDNEXT );
}
return FALSE;
}
}
...

[kingzai]

GetTopWindow（）其参数是指这个窗口的父窗口,返回的是最上面的窗口句柄，如你想要找DESKTOP上的最上面的窗口，你可以这样做GetTopWindow（GetDesktopWindow()），垂直于屏幕的方向就是z order

[xuzheng318]

CWND类有个变量m_hwnd,可以直接用
CWND还有如下函数，具体情况具体用
GetDesktopWindow Retrieves the Windows desktop window.
GetForegroundWindow Returns a pointer to the foreground window (the top-level window with which the user is currently

GetTopWindow Returns the first child window that belongs to the CWnd.
GetWindow .....

FindWindow Returns the handle of the window, which is identified by its window name and window class.

或者GetDlgItem,用于对话框与子窗口

在CWindo与SDK中还有GetWindowLong用与找父窗口

[luxin24]

GetTopWindow Function

--------------------------------------------------------------------------------

The GetTopWindow function examines the Z order of the child windows associated with the specified parent window and retrieves a handle to the child window at the top of the Z order.

Syntax

HWND GetTopWindow( HWND hWnd
);
Parameters

hWnd
[in] Handle to the parent window whose child windows are to be examined. If this parameter is NULL, the function returns a handle to the window at the top of the Z order.
Return Value

If the function succeeds, the return value is a handle to the child window at the top of the Z order. If the specified window has no child windows, the return value is NULL. To get extended error information, use the GetLastError function.

[czhsdhs]

在CMainFrame中有一个菜单的映射消息，在函数里有如下代码:
void CMainFrame::OnHelpTest2()
{
// TODO: Add your command handler code here

CString strText;

GetTopWindow()->GetWindowText(strText);
AfxMessageBox(strText);
}
为什么strText老是空呀。我想它应该是我已经打开的在前面的子窗口名称呀。

[koko1998]

gz

[oyljerry]

看是否获得窗口handle