本文探讨了使用Java GUI和CGI程序进行消息传递的区别。发现Java GUI消息比CGI消息长4字节，并且这4字节全为0xFF。文中还介绍了在SCS上创建、删除及修改内存记录的过程，指出直接修改记录不可行，需要通过先删除后重新注册的方式来间接实现。
There are two kinds of messages using to communicate. One is used by GUI written by Java, another is used by our CGI program.
I found that the former is 4 bytes longer than the later. The 4 bytes are all 0xFF.
Today I tested how to register, delete, and modify a record in memory on a SCS. I created three messages. The register message
and delete message can be accepted successfully. But the modification message can not be accepted. It means that we can not update
a record by sending a message. We must adopt an indirectly way that is to delete the old record and register a new record with new
states.
There is a phenomenon when deleting a record, the slot of the record of deleted is not set by initialized values -- 0. Some fields
still hold their values.
I found that the former is 4 bytes longer than the later. The 4 bytes are all 0xFF.
Today I tested how to register, delete, and modify a record in memory on a SCS. I created three messages. The register message
and delete message can be accepted successfully. But the modification message can not be accepted. It means that we can not update
a record by sending a message. We must adopt an indirectly way that is to delete the old record and register a new record with new
states.
There is a phenomenon when deleting a record, the slot of the record of deleted is not set by initialized values -- 0. Some fields
still hold their values.
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