Question

你好，用SetWindowLong给CEdit控件设置ES_MULTILINE的属性为什么不好用呢？？？其他的都好用啊。

LONG nn=GetWindowLong(m_Edit,GWL_STYLE);
SetWindowLong(m_Edit.m_hWnd,GWL_STYLE,WS_CHILD|WS_VISIBLE|ES_MULTILINE|ES_LEFT );
nRect.left += 16;
nRect.right -= 20;
m_Edit.SetRect(&nRect);//还是不起作用！

Answer 1

关于SetWindowLong，remark部分有这么一段话

Certain window data is cached, so changes you make using SetWindowLong will not take effect until you
call the SetWindowPos function. Specifically, if you
change any of the frame styles, you must call SetWindowPos with the SWP_FRAMECHANGED flag for the cache to be
updated properly.
你说的不起作用指的是控件的位置没有移动吗？我对MFC不熟，移动的话我记得好像是MoveWindow……SetRect我没用过

Answer 2

Certain window data is cached, so changes you make using SetWindowLong will not take effect until you
call the SetWindowPos function. Specifically, if you
change any of the frame styles, you must call SetWindowPos with the SWP_FRAMECHANGED flag for the cache to be
updated properly.
上面这段话已经说了，你还需要调用SetWindowPos 才能使得设置生效！