Delphi7中emptyparam不能用？Delphi中可以？

Question

Var myexcel:Texcelapplication;
    mybook:Texcelworkbook;
    mysheet:Texcelworksheet;
Begin
Myexcel:=Texcelapplication.create(self);
myexcel.connect;
myexcel.visible[0]:=true
mybook:=Texcelworkbook.create(self);
mysheet:=Texcelworksheet.create(self);
mybook.connectto(myexcel.workbooks.add(emptyparam,0));
myexcel.connectto(mybook.worksheets.add(emptyparam,emptyparam,emptyparam,emptyparam,0) as _worksheet);
最后两名在DELPHI5可通过。可不能DELPHI7中运行。 如何更改？谢谢！

Answer 1

好像是在windows单元还是variant单元里包含的,加上单元的引用吧