打印预览代码出错
从网上看到在PowerBuilder中实现数据窗口打印预览通用方法,就照做了,可运行时提示"null object reference at line 3 in open event of object w_preivew"
我在w_preivew窗口中的代码是:
s_preview preview_parm
preview_parm=message.powerobjectparm
dw_1.dataobject=preview_parm.dw_name
dw_1.settransobject(sqlca)
dw_1.object.datawindow.print.preview="yes"
我是参照网上这个做的:
http://blog.csdn.net/nthb2001/archive/2001/07/06/10329.aspx
请高手指教,谢谢