dialog开发
屏幕编程：ok_code在程序里用sy-ucomm接受
调用其他事物代码：
call transaction ‘SE38’.
1:50
选择屏幕之屏幕按钮：
selection-screen begin of block b1
with frame
title text-001.指定框架的名称
selection-screen pushbutton /5(30) pus1 user-command ab1. ”/5是留出的空格，（30）是长度，pus1是按钮名称接受描述的，user-command指定功能码的，ab1是ok_code，在下面判断的时候需要大写
selection-screen skip."在屏幕上跳转行的不然紧里的很紧
selection-screen pushbutton /5(30) pus2 user-command ab2.
selection-screen end of block b1.
initialization.
pus1 = '单击此处跳转到SE38'. 为变量赋值的text
pus2 = '单击此处跳转到客制TCODE'
at selection-screen.
if sy-ucomm = 'ab1'.
call transaction 'se38'.
endif.
if sy-ucomm = 'ab'.
submit z_selectscreen_01_demo using selection 1000
with p_matnr = pus1.
**************************************************************************
selection-screen begin of block b1
with frame
title text-01.
parameters: p_insert radiobutton group z user-command r default 'X',
p_delete radiobutton group z,
p_modify radiobutton group z,
p_disp radiobutton group z.
selection-screen skip.
selection-screen begin of block b2
with frame
title text-002.
selection-screen skip.
select-options: s_werks for t001w-werks modif id ab.
selection-screen end of block b2.
selection-screen end of block b1.
at selection-screen output.
loop at screen. " 系统内表
if p_insert = 'X'.
if screen-name CS 'S_WERKS'. "CS是判断字段screen-name有没有包含字符
串S_WERKS，如果包含就继续执行，如果不包含就不执行
screen-active = '0'.
endif.
if screen-group1 = 'AB'.
endif.
endif.
modify screen.
endloop.
*********************************************************
module user_command_0109 input.
ok_code = sy-ucomm.
case ok_code.
when 'show'.
set parameter id 'mat' field '4456'. "往sap输入框中赋值，这里的mat
就是内存的意思
sap内存还可以直接到字段所在的表里取找，点击进到该字段 看属性就可以看
到内存标识了 parameter ID