检索类名和窗口名指定字符串 (不区分大小写)，匹配的顶层窗口句柄。
摘 自： FindWindow 函数 (winuser.h)
另请参阅：
win32gui.FindWindow(ClassName, WindowName)
HWND FindWindowW( [in, optional] LPCWSTR lpClassName, [in, optional] LPCWSTR lpWindowName );
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