说明：  该文件为VB语言下对GPIB端口进行编程控制的动态链接文件(DLL)，针对的GPIB卡为NI公司的系列卡，其他公司的可能有所不同
(The file is VB language programming under the control of GPIB port dynamic link files (DLL), for a GPIB card NI' s range of cards, may be different from other companies)