创建一个windows窗口程序,含有4个菜单项,分别用来创建和撤消记事本进程和计算器进程。若相应进程已经创建了,再选择创建进程菜单,则弹出对话框提示进程已经创建 若进程已经撤消了,再选择撤消进程菜单,则弹出对话框提示进程已经撤消。注意考虑从主程序外部启动和关闭进程的情况。-Create a windows window procedure, contains four menu items, were used to create and undo the Notepad process, and a calculator process. The corresponding process has been created, the process menu and then choose to create a pop-up dialog box prompts the process has been created　if the process has been withdrawn, and then choose to undo the process menu, then pop up a dialog box prompts the process has been revoked. Note that considering the startup and shutdown of the process from the main external.