c++ - 结合使用 libcurl 和 curlpp 时编译错误

Question

我想使用 libcurl 和 cURLpp 向服务器发送一个 http POST 请求。当我尝试编译我的程序时，出现了这些错误。我不认为错误来自 libcurl 或 curlpp，所以我一定做错了什么。
有人知道解决方案吗？

Severity    Code    Description Project File    Line
Error   C2491   'curlpp::internal::OptionContainer<OptionType>::getValue': definition of dllimport function not allowed Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\internal\optioncontainer.inl 60
Error   C2491   'curlpp::internal::OptionContainer<OptionType>::OptionContainer': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\internal\optioncontainer.inl 39
Error   C2491   'curlpp::internal::OptionContainer<OptionType>::OptionContainer': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\internal\optioncontainer.inl 45
Error   C2491   'curlpp::internal::OptionContainer<OptionType>::setValue': definition of dllimport function not allowed Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\internal\optioncontainer.inl 53
Error   C2491   'curlpp::internal::OptionContainer<OptionType>::getHandleOptionValue': definition of dllimport function not allowed Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\internal\optioncontainer.inl 67
Error   C2491   'curlpp::internal::OptionSetter<OptionValueType,optionType>::setOpt': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\internal\optionsetter.inl    36
Error   C2491   'curlpp::internal::OptionSetter<std::string,optionType>::setOpt': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\internal\optionsetter.inl    45
Error   C2491   'curlpp::internal::OptionSetter<std::list<std::string,std::allocator<_Ty>>,optionType>::setOpt': definition of dllimport function not allowed   Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\internal\optionsetter.inl    54
Error   C2491   'curlpp::Option<OT>::Option': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   45
Error   C2491   'curlpp::Option<OT>::Option': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   52
Error   C2491   'curlpp::Option<OT>::Option': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   63
Error   C2491   'curlpp::Option<OT>::~Option': definition of dllimport function not allowed Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   71
Error   C2491   'curlpp::Option<OT>::setValue': definition of dllimport function not allowed    Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   86
Error   C2491   'curlpp::Option<OT>::updateMeToOption': definition of dllimport function not allowed    Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   99
Error   C2491   'curlpp::Option<OT>::clear': definition of dllimport function not allowed   Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   107
Error   C2491   'curlpp::Option<OT>::getValue': definition of dllimport function not allowed    Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   117
Error   C2491   'curlpp::OptionTrait<OptionType,opt>::OptionTrait': definition of dllimport function not allowed    Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   125
Error   C2491   'curlpp::OptionTrait<OptionType,opt>::OptionTrait': definition of dllimport function not allowed    Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   131
Error   C2491   'curlpp::OptionTrait<OptionType,opt>::clone': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   139
Error   C2491   'curlpp::OptionTrait<OptionType,opt>::updateHandleToMe': definition of dllimport function not allowed   Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   152
Error   C2491   'curlpp::NoValueOptionTrait<option>::NoValueOptionTrait': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   160
Error   C2491   'curlpp::NoValueOptionTrait<option>::clone': definition of dllimport function not allowed   Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   168
Error   C2491   'curlpp::NotAvailableOptionTrait<OptionType>::NotAvailableOptionTrait': definition of dllimport function not allowed    Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   178
Error   C2491   'curlpp::NotAvailableOptionTrait<OptionType>::NotAvailableOptionTrait': definition of dllimport function not allowed    Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   185
Error   C2491   'curlpp::NotAvailableOptionTrait<OptionType>::clone': definition of dllimport function not allowed  Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   193
Error   C2491   'curlpp::NotAvailableOptionTrait<OptionType>::updateHandleToMe': definition of dllimport function not allowed   Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\curlpp\include\curlpp\option.inl   201
Error   C3867   'std::basic_ostringstream<char,std::char_traits<char>,std::allocator<char>>::str': non-standard syntax; use '&' to create a pointer to member   Projekt1    c:\users\otuser1\documents\visual studio 2015\projects\projekt1\projekt1\main.cpp   203

Answer 1

看起来 header 试图从 dll 导入(未定义 CURLPP_STATICLIB)但也提供了定义，当从 dll 导入它们时它们不应该这样做。

您可能需要在包含 curlpp header 之前定义 CURLPP_STATICLIB，或者您可以修改在 Visual Studio 中设置库的方式。虽然我不能真正解释你应该看什么，因为我对 dll 和 Visual Studio 不太熟悉。

要获得更具体的答案，请提供一些信息，说明您如何将 curlpp 包含到您的项目/Visual Studio 中。