确定HWND是否代表顶级窗口的最佳方法是什么？

Question

Is it to check for the WS_CHILD bit:

    LONG style = GetWindowLong(hwnd, GWL_STYLE);
    int isTopLevel = !(style & WS_CHILD);

Or is there a better way?

Assume : Straight C calling only existing Windows API code.

Answer 1

• Way #1: Test hWnd==GetAncestor(hWnd,GA_ROOT)

• Way #2: Use IsTopLevelWindow (user32 Win7, undocumented)

Answer 2

GetParent（）API返回当前窗口的父级或所有者。

Answer 3

Your method is possible (But I think you had better to check if it is a overlapped/popup window too). There is maybe another way -- That is to enum all top level windows and to check if your windows is included in result.