求助，装配的问题！！！

wangqin0204 · 发表于 2006-8-21 10:25:48

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Dim ftf As UFAssem.MatingCondition
      theUfSession.Assem.InitMc(ftf)    /////////////////////////////////////////
      ftf.mated_object = from_part_ins
      ftf.part_occurrence = to_part_occ
      ftf.name = ""
      ftf.user_name = False
      ftf.constraints(0).from_status = UFAssem.LoadStatus.Ok          ///////////////////////
      ftf.constraints(0).to_status = UFAssem.LoadStatus.Ok
      ftf.constraints(0).mate_type = UFConstants.UF_ASSEM_v16_mate
      ftf.constraints(0).from_type = UFConstants.UF_ASSEM_planar_face
      ftf.constraints(0).to_type = UFConstants.UF_ASSEM_planar_face
      ftf.constraints(0).from = firstplan
      ftf.constraints(0).from_part_occ = from_part_occ
      ftf.constraints(0).to = secondplan
      ftf.constraints(0).to_part_occ = to_part_occ
      ftf.constraints(0).offset = Tag.Null
      ftf.constraints(0).name = "face to face"
      ftf.constraints(0).user_name = True

为什么运行到第2行就报错“未将对象的引用设置到对象的实例”？？
如果我把第二行去掉，到了第七行还是这个错误