Name

Type

Optional

Meaning

hDlg

Number

No

Handle to a window. The window handle retrieved is relative to this window, based on the value of the uCmd parameter.

uCmd

Number

No

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.

%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.