区别CALL SCREEN/SET SCREEN/LEAVE TO SCREEN
来源:互联网 发布:海知智能 王宇 编辑:程序博客网 时间:2024/06/11 16:14
1、CALL SCREEN XXXX将在Screen调用栈(CALL STACK)上面添加一层调用(进栈),调用XXXX的PBO和PAI,如果XXXX的Next Screen不为0,那么将继续其Next Screen的PBO和PAI,如此继续~~~当最后碰到Next Screen为0时,该层调用将从调用栈中退出(出栈),然后系统将继续执行CALL SCREEN XXXX之后的语句。
2、SET SCREEN XXXX,设置调用栈当前层次的Next Screen为XXXX,它并不影响调用栈的层数,除非XXXX为0,那将导致调用栈退掉一层(出栈)。要注意的是,PAI中SET SCREEN XXXX后的语句,系统将照样执行。只有执行完毕该PAI整个逻辑后,才考虑Next Screen的PBO和PAI。
3、LEAVE TO SCREEN与SET SCREEN比较类似,所不同的是,LEAVE TO SCREEN XXXX将强行中断当前SCREEN的PAI,直接执行XXXX的PBO和PAI。换言之,PAI中LEAVE TO SCREEN XXXX后的语句,系统将不会执行到。
在ABAP中,CALL TRANSACTION和SUBMIT report_name AND RETURN语句,也都是在调用栈上添加一层调用,与CALL SCREEN有点类似。而LEAVE TO TRANSACTION以及SUBMIT report_name则是在调用栈当前层次的一个跳转,与LEAVE TO SCREEN类似。
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