如何获得子窗口的句柄?

[wangzi761129]

有一个函数的参数是CWnd类,如何获得子窗口的句柄作实参?

[sans]

GetDlgItem( IDC_SUBWIN );
GetWindow( m_hWnd, GW_CHILD );
...

[wangzi761129]

你的意思是利用GetWindow这个函数,这两个参数又是什么意思?请明示!不太了解这个!

[everandforever]

CWnd* p;
HANDLE h = CWnd::GetSafeHwnd(); //不知函数写对没有 ：）好久没用这个函数 了。

[everandforever]

HANDLE h = CWnd::GetSafeHwnd(p); //不知函数写对没有 ：）好久没用这个函数 了。

[ntem]

GetWindow

The GetWindow function retrieves a handle to a window that has the specified relationship (Z order or owner) to the specified window.

HWND GetWindow(
HWND hWnd, // handle to original window
UINT uCmd // relationship
);
Parameters
hWnd
[in] Handle to a window. The window handle retrieved is relative to this window, based on the value of the uCmd parameter.
uCmd
[in] Specifies the relationship between the specified window and the window whose handle is to be retrieved. This parameter can be one of the following values. Value Meaning

GW_CHILD The retrieved handle identifies the child window at the top of the Z order, if the specified window is a parent window; otherwise, the retrieved handle is NULL. The function examines only child windows of the specified window. It does not examine descendant windows.

GW_ENABLEDPOPUP Windows 2000/XP: The retrieved handle identifies the enabled popup window owned by the specified window (the search uses the first such window found using GW_HWNDNEXT); otherwise, if there are no enabled popup windows, the retrieved handle is that of the specified window.

GW_HWNDFIRST The retrieved handle identifies the window of the same type that is highest in the Z order. If the specified window is a topmost window, the handle identifies the topmost window that is highest in the Z order. If the specified window is a top-level window, the handle identifies the top-level window that is highest in the Z order. If the specified window is a child window, the handle identifies the sibling window that is highest in the Z order.

GW_HWNDLAST The retrieved handle identifies the window of the same type that is lowest in the Z order. If the specified window is a topmost window, the handle identifies the topmost window that is lowest in the Z order. If the specified window is a top-level window, the handle identifies the top-level window that is lowest in the Z order. If the specified window is a child window, the handle identifies the sibling window that is lowest in the Z order.

GW_HWNDNEXT The retrieved handle identifies the window below the specified window in the Z order. If the specified window is a topmost window, the handle identifies the topmost window below the specified window. If the specified window is a top-level window, the handle identifies the top-level window below the specified window. If the specified window is a child window, the handle identifies the sibling window below the specified window.

GW_HWNDPREV The retrieved handle identifies the window above the specified window in the Z order. If the specified window is a topmost window, the handle identifies the topmost window above the specified window. If the specified window is a top-level window, the handle identifies the top-level window above the specified window. If the specified window is a child window, the handle identifies the sibling window above the specified window.

GW_OWNER The retrieved handle identifies the specified window's owner window, if any. For more information, see Owned Windows.


Return Values
If the function succeeds, the return value is a window handle. If no window exists with the specified relationship to the specified window, the return value is NULL. To get extended error information, call GetLastError.

Remarks
The EnumChildWindows function is more reliable than calling GetWindow in a loop. An application that calls GetWindow to perform this task risks being caught in an infinite loop or referencing a handle to a window that has been destroyed.

===========
摘自MSDN

你不能啥都指望别人给你详尽的回答啊，如果没有MSDN，那赶紧去装一个吧。