PB对外部函数的调用

摘要

Shows several familiar methods to call external function by PowerBuilder and their definition format,and gives a comparision of call effici ency between external and internal functions.%给出了PowerBuilder的几种常见的外部函数调用方法及外部函 数的定义形式，并对外部函数和内部函数的调用效率作了比较。