目的：实现多gui间的通信。

1. 由gui1打开gui2，并从gui2读取数据画图；

2. 数据包的传递：在gui1定义一个数据包，包括字符串，数据，把数据包传递给gui2并由其更新，gui2更新好的数据在传回gui1并显示出来。（注：程序中加黑划线部分为实现预期功能的要点）-Purpose: communication gui. Method: 1. Opened by gui1 gui2, and to read data from gui2 drawing　(2) the transfer of the packet: a packet defined in gui1, including strings, data packets passed to gui2 updated by gui2 the updated data in the returned gui1 and displayed. (Note: the program plus the the black underlined part to achieve the desired functionality of the points)