有那位大哥使用过 RBuilder 报表控件的请帮帮小弟吧！(20分)

[!]在打印预览中，我有如下的代码：
ppReport1.deviceType := 'dtScreen' ;
ppViewer1.ZoomPercentage :=50;
ppReport1.PrintToDevices ;
请教大哥，为什么什么也不显示？

Youdo
n't need a ppViewer1 component, you just need to add this line in
your TppReport.OnPreviewFormCreate event:
TppViewer(ppReport1.PreviewForm.Viewer).ZoomPercentage :=50;
then
just call
ppReport1.deviceType := 'dtScreen' ;
ppReport1.print;
You can see your report now.