实现VC中分割窗体，并创建另一对话框，实现MainFrm中两个分割的窗体和对话框之间的通讯，充分利用窗口之间的消息，实现窗口之间的通讯和数据传递！-VC separate windows, and the creation of another dialog box, MainFrm achieve two separate windows and dialog between the communications, and make full use of the window between