#include;导致错误
comutil.h 库时出错，
> Error 20 error LNK2001: unresolved
> external symbol "extern "C" long
> __stdcall VariantCopy(struct tagVARIANT *,struct tagVARIANT const
> *)" (?VariantCopy@@$$J18YGJPAUtagVARIANT@@PBU1@@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 18 error LNK2001: unresolved
> external symbol "extern "C" void
> __stdcall VariantInit(struct tagVARIANT *)"
> (?VariantInit@@$$J14YGXPAUtagVARIANT@@@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 13 error LNK2001: unresolved
> external symbol "void __stdcall
> _com_issue_error(long)" (?_com_issue_error@@$$FYGXJ@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 10 error LNK2028: unresolved
> token (0A000376) "void __stdcall
> _com_issue_error(long)" (?_com_issue_error@@$$FYGXJ@Z)
> referenced in function "void __cdecl
> _com_util::CheckError(long)" (?CheckError@_com_util@@$$FYAXJ@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 4 error LNK2028: unresolved
> token (0A0003BC) "extern "C" void
> __stdcall VariantInit(struct tagVARIANT *)"
> (?VariantInit@@$$J14YGXPAUtagVARIANT@@@Z)
> referenced in function "public:
> __thiscall _variant_t::_variant_t(class _variant_t const &)" (??0_variant_t@@$$FQAE@ABV0@@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 2 error LNK2028: unresolved
> token (0A0003D1) "extern "C" long
> __stdcall VariantCopy(struct tagVARIANT *,struct tagVARIANT const
> *)" (?VariantCopy@@$$J18YGJPAUtagVARIANT@@PBU1@@Z)
> referenced in function "public:
> __thiscall _variant_t::_variant_t(class _variant_t const &)" (??0_variant_t@@$$FQAE@ABV0@@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
VS 2010 C++ CLR 库项目，添加所需的
private:
std::string from_variant(VARIANT& vt)
{
_bstr_t bs(vt);
return std::string(static_cast<const char*>(bs));
}
/*
void to_variant(const std::string& str, VARIANT& vt)
{
_bstr_t bs(str.c_str());
reinterpret_cast<_variant_t&>(vt) = bs;
}*/
我该如何修复它？
VS 2010 C++ CLR Library project, errors on adding comutil.h library
> Error 20 error LNK2001: unresolved
> external symbol "extern "C" long
> __stdcall VariantCopy(struct tagVARIANT *,struct tagVARIANT const
> *)" (?VariantCopy@@$J18YGJPAUtagVARIANT@@PBU1@@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 18 error LNK2001: unresolved
> external symbol "extern "C" void
> __stdcall VariantInit(struct tagVARIANT *)"
> (?VariantInit@@$J14YGXPAUtagVARIANT@@@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 13 error LNK2001: unresolved
> external symbol "void __stdcall
> _com_issue_error(long)" (?_com_issue_error@@$FYGXJ@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 10 error LNK2028: unresolved
> token (0A000376) "void __stdcall
> _com_issue_error(long)" (?_com_issue_error@@$FYGXJ@Z)
> referenced in function "void __cdecl
> _com_util::CheckError(long)" (?CheckError@_com_util@@$FYAXJ@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 4 error LNK2028: unresolved
> token (0A0003BC) "extern "C" void
> __stdcall VariantInit(struct tagVARIANT *)"
> (?VariantInit@@$J14YGXPAUtagVARIANT@@@Z)
> referenced in function "public:
> __thiscall _variant_t::_variant_t(class _variant_t const &)" (??0_variant_t@@$FQAE@ABV0@@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
> Error 2 error LNK2028: unresolved
> token (0A0003D1) "extern "C" long
> __stdcall VariantCopy(struct tagVARIANT *,struct tagVARIANT const
> *)" (?VariantCopy@@$J18YGJPAUtagVARIANT@@PBU1@@Z)
> referenced in function "public:
> __thiscall _variant_t::_variant_t(class _variant_t const &)" (??0_variant_t@@$FQAE@ABV0@@Z) D:\Projects\AL\Service\ncFlow\ncOPClient.NET\Stdafx.obj ncOPClient.NET
needed for
private:
std::string from_variant(VARIANT& vt)
{
_bstr_t bs(vt);
return std::string(static_cast<const char*>(bs));
}
/*
void to_variant(const std::string& str, VARIANT& vt)
{
_bstr_t bs(str.c_str());
reinterpret_cast<_variant_t&>(vt) = bs;
}*/
how can I fix it ?
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评论（3）
尝试包含 comdef.h，不包含 comutil.h
try to include comdef.h, don't include comutil.h
根据 MSDN，
_bstr_t需要 comsuppw.lib。将此库添加到链接器依赖项列表中。According to MSDN,
_bstr_trequires comsuppw.lib. Add this library to the linker dependencies list.根据文档添加必需的导入库，可能是
Oleaut32.libhttp://msdn.microsoft.com/en-us/library/ms221236.aspx
编辑： 我假设 编译器 COM 支持 库包含此内容，Alex 的答案将是首选库。
Add the requisite import library as per the documentation, likely
Oleaut32.libhttp://msdn.microsoft.com/en-us/library/ms221236.aspx
edit: I'm assuming the Compiler COM Support library subsumes this and Alex's answer would be the preferred library.