如何将 MFC CString 与 boost 字符串算法库一起使用
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【中文标题】如何将 MFC CString 与 boost 字符串算法库一起使用【英文标题】:How do I use MFC CString with the boost string algorithm library 【发布时间】:2013-07-04 09:56:52 【问题描述】:初步说明:string_algo 与 std::wstring
配合得很好,当然,如果需要算法,我可以(并且确实)首先将 CString 对象转换为 std::wstring来自 string_algo。如果我可以直接放入 CString 对象,那就太好了——与现有代码的集成会容易得多!
我想做什么:
CString in = ...;
const CString out = boost::replace_last_copy(in, L"SEARCH", L"REPLACE");
作为suggested here,我尝试另外包含boost/range/mfc.hpp
以拥有Boost.Range adapted to MFC。 (虽然我不太明白this header 看起来它似乎对CString 没有任何作用,只对集合类。)
使用 Visual Studio 2005 提升 1.44.0
测试代码如下:
#include "stdafx.h"
#include <iostream>
#include <boost/range/mfc.hpp>
#include <boost/algorithm/string.hpp>
void f(CString const& input)
CString out = boost::replace_last_copy(input, L"FROM", L"TO");
std::wcout << out << "\n";
我得到的错误如下所示:
1>c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format_store.hpp(77) : error C2039: 'type' : is not a member of 'boost::range_const_iterator<C>'
1> with
1> [
1> C=const CString
1> ]
1> c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format.hpp(139) : see reference to function template instantiation 'bool boost::algorithm::detail::check_find_result<const InputT,const FindResultT>(InputT &,FindResultT &)' being compiled
1> with
1> [
1> InputT=CString,
1> FindResultT=boost::iterator_range<const wchar_t *>
1> ]
1> c:\programme\boost_library-1_44_0\boost\algorithm\string\find_format.hpp(113) : see reference to function template instantiation 'InputT boost::algorithm::detail::find_format_copy_impl<SequenceT,FormatterT,boost::iterator_range<IteratorT>>(const InputT &,FormatterT,const FindResultT &)' being compiled
1> with
1> [
1> InputT=CString,
1> SequenceT=CString,
1> FormatterT=boost::algorithm::detail::const_formatF<boost::iterator_range<const wchar_t *>>,
1> IteratorT=const wchar_t *,
1> FindResultT=boost::iterator_range<const wchar_t *>
1> ]
1> c:\programme\boost_library-1_44_0\boost\algorithm\string\replace.hpp(314) : see reference to function template instantiation 'SequenceT boost::algorithm::find_format_copy<SequenceT,boost::algorithm::detail::last_finderF<SearchIteratorT,PredicateT>,boost::algorithm::detail::const_formatF<RangeT>>(const SequenceT &,FinderT,FormatterT)' being compiled
1> with
1> [
1> SequenceT=CString,
1> SearchIteratorT=const wchar_t *,
1> PredicateT=boost::algorithm::is_equal,
1> RangeT=boost::iterator_range<const wchar_t *>,
1> FinderT=boost::algorithm::detail::last_finderF<const wchar_t *,boost::algorithm::is_equal>,
1> FormatterT=boost::algorithm::detail::const_formatF<boost::iterator_range<const wchar_t *>>
1> ]
1> ....\mytest.cpp(10) : see reference to function template instantiation 'SequenceT boost::algorithm::replace_last_copy<CString,const wchar_t[5],const wchar_t[3]>(const SequenceT &,Range1T (&),Range2T (&))' being compiled
1> with
1> [
1> SequenceT=CString,
1> Range1T=const wchar_t [5],
1> Range2T=const wchar_t [3]
1> ]
1>c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format_store.hpp(78) : error C3203: 'type' : unspecialized class template can't be used as a template argument for template parameter 'IteratorT', expected a real type
1>c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format.hpp(121) : error C2780: 'void boost::algorithm::detail::insert(InputT &,InputT::iterator,const InsertT &)' : expects 3 arguments - 4 provided
1> c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\sequence.hpp(39) : see declaration of 'boost::algorithm::detail::insert'
1> c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format.hpp(144) : see reference to function template instantiation 'InputT boost::algorithm::detail::find_format_copy_impl2<InputT,FormatterT,FindResultT,boost::iterator_range<IteratorT>>(const InputT &,FormatterT,const FindResultT &,const FormatResultT &)' being compiled
1> with
1> [
1> InputT=CString,
1> FormatterT=boost::algorithm::detail::const_formatF<boost::iterator_range<const wchar_t *>>,
1> FindResultT=boost::iterator_range<const wchar_t *>,
1> IteratorT=const wchar_t *,
1> FormatResultT=boost::iterator_range<const wchar_t *>
1> ]
1>c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format.hpp(121) : error C2893: Failed to specialize function template 'void boost::algorithm::detail::insert(InputT &,InputT::iterator,ForwardIteratorT,ForwardIteratorT)'
1> With the following template arguments:
1> 'CString'
1> 'const wchar_t *'
1>c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format.hpp(123) : error C2893: Failed to specialize function template 'void boost::algorithm::detail::insert(InputT &,InputT::iterator,const InsertT &)'
1> With the following template arguments:
1> 'CString'
1> 'boost::iterator_range<IteratorT>'
1> with
1> [
1> IteratorT=const wchar_t *
1> ]
1>c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format.hpp(123) : error C2780: 'void boost::algorithm::detail::insert(InputT &,InputT::iterator,ForwardIteratorT,ForwardIteratorT)' : expects 4 arguments - 3 provided
1> c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\sequence.hpp(29) : see declaration of 'boost::algorithm::detail::insert'
1>c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format.hpp(125) : error C2780: 'void boost::algorithm::detail::insert(InputT &,InputT::iterator,const InsertT &)' : expects 3 arguments - 4 provided
1> c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\sequence.hpp(39) : see declaration of 'boost::algorithm::detail::insert'
1>c:\programme\boost_library-1_44_0\boost\algorithm\string\detail\find_format.hpp(125) : error C2893: Failed to specialize function template 'void boost::algorithm::detail::insert(InputT &,InputT::iterator,ForwardIteratorT,ForwardIteratorT)'
1> With the following template arguments:
1> 'CString'
1> 'const wchar_t *'
【问题讨论】:
【参考方案1】:尝试将CString
替换为CStringW
,以防CString
映射到CStringA
。
确切的错误代码在标题的哪一行呢?可以尝试替换本地代码中的相同错误吗?
【讨论】:
这绝对是一个 UNICODE 版本,所以CStringW
。完整的测试代码在问题中。 (取模一个大部分为空的main
)
如果你明确类型转换为 LPCWSTR,或者使用 GetString,或者传递一个非 const CString 对象怎么办?以上是关于如何将 MFC CString 与 boost 字符串算法库一起使用的主要内容,如果未能解决你的问题,请参考以下文章
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