3

我正在尝试使用带有 boost 的 C++ 开发跨平台应用程序。

我通常在 *nix 环境中编程,我总是将“main”定义如下:

int main( const int argc, const char* argv[] )
{
...
}

对于这个应用程序,我从 Windows 环境开始,使用 Visual Studio 2003。

当我尝试在此定义中使用 boost::program_options 时,我从 program_options::store 中得到编译错误:

po::options_description desc("Supported options");
desc.add_options()...;
po::variables_map vm;
po::store(po::parse_command_line(argc, argv, desc), vm);

错误:

main.cpp(46) : error C2665: 'boost::program_options::store' : none of the 2 overloads can convert parameter 1 from type 'boost::program_options::basic_parsed_options<charT>'
    with
    [
        charT=const char
    ]
    c:\boost_1_38_0\boost\program_options\variables_map.hpp(34): could be 'void boost::program_options::store(const boost::program_options::basic_parsed_options<charT> &,boost::program_options::variables_map &,bool)'
    with
    [
        charT=char
    ]
    c:\boost_1_38_0\boost\program_options\variables_map.hpp(43): or       'void boost::program_options::store(const boost::program_options::basic_parsed_options<wchar_t> &,boost::program_options::variables_map &)'
    while trying to match the argument list '(boost::program_options::basic_parsed_options<charT>, boost::program_options::variables_map)'
    with
    [
        charT=const char
    ]

我试图通过如下定义 main 来强制 wchar_t 函数:

int main( const int argc, wchar_t* argv[]){
...
}

然后它编译,但我得到链接错误:

main.obj : error LNK2019: unresolved external symbol "void __cdecl boost::program_options::store(class boost::program_options::basic_parsed_options<unsigned short> const &,class boost::program_options::variables_map &)"  referenced in function _main
main.obj : error LNK2019: unresolved external symbol "public: __thiscall boost::program_options::basic_parsed_options<unsigned short>::basic_parsed_options<unsigned short>(class boost::program_options::basic_parsed_options<char> const &)"  referenced in function "public: class boost::program_options::basic_parsed_options<unsigned short> __thiscall boost::program_options::basic_command_line_parser<unsigned short>::run(void)" 
main.obj : error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl boost::program_options::to_internal(class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > const &)"  referenced in function "class std::vector<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > > __cdecl boost::program_options::to_internal<class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > >(class std::vector<class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> >,class std::allocator<class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > > > const &)" 

最后,如果我回到 Visual Studio 的默认主定义设置,它会编译并链接:

int main( const int argc, _TCHAR* argv[]){
...
}

所以,这对 Windows 来说很好,但是当我尝试将它带到 *nix 时,它会起作用吗?这些系统通常定义 _TCHAR 类型吗?我个人没有遇到过。

定义 main 以在 Windows 和 *nix 上工作以及使用 boost::program_options 库的正确方法是什么?

4

2 回答 2

5

这似乎是一个与常数相关的问题。尝试:

int main( int argc, char* argv[] )
{
  // ...
}
于 2009-06-30T21:34:50.640 回答
1

int main()int main(int argc, char* argv[])(aka int main(int argc, char** argv)) 是 C++ 标准认可的签名。

VisualStudio 试图以许多疯狂的方式提供帮助,包括尝试确定 (1) 你想要 amain()还是 aWinMain()以及 (2) 决定你想要chars 还是wchar_ts。如果 VisualStudio 认为您不是在控制台应用程序中工作,您可能需要调用 split_winmain()

如果你想强制chars (我会推荐)你可能需要#undef UNICODE.

于 2009-06-30T21:39:45.950 回答