窗体调用的问题

Question

if assigned(FrmStatThrowaway) then
    FrmStatThrowaway:=TFrmStatThrowaway.create(application);
  FrmStatThrowaway.show;
为什么我一运行就出错????????????

Answer 1

if not assigned(FrmStatThrowaway) then
    FrmStatThrowaway:=TFrmStatThrowaway.create(application);
  FrmStatThrowaway.show;函数assigned前面应该加not才行.

Answer 2

if not assigned(FrmStatThrowaway) then begin
    FrmStatThrowaway:=TFrmStatThrowaway.create(application);
  FrmStatThrowaway.show;
end
else
  FrmStatThrowaway.show;

Answer 3

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http://expert.csdn.net/Expert/topic/1726/1726330.xml?temp=.5689661
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