'class _variant_t'到'struct tagVARIANT *'类型怎么转换。。。

Question

   spApp->get_Workbooks(&books);
    books->Add(_variant_t("D:\\excel\\ExcelAddin\\11.xlt"),lcid,&book); 
spApp->Run(_variant_t("UserAddin"),vtMissing,vtMissing, 
    vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing, 
    vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing, 
    vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing, 
    vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing,vtMissing); 编译不过去，老出现这个错误，Run' : cannot convert parameter 32 from 'class _variant_t' to 'struct tagVARIANT *'
        No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
Error executing cl.exe.
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Answer 1

把第32个参数由vtMissing改为&vtMissing