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 destroy processes and calculator Notepad process. If the corresponding process has been created, and then select the menu creation process, the process has created the pop-up dialog box prompts　if the process has been withdrawn, and then undo the process of menu selection, the pop-up dialog box prompts the process has been withdrawn. Note that consideration from the main program startup and shutdown process, the external situation.