cpp中std::string和std::wstring 相互转换 #include<iostream>#include<string>#include<locale>#include<codecvt>std::wstrings2ws(conststd::string& str){ using convert_typeX =std::codecvt_utf8<wchar_t>;std::wstring_convert<convert_typeX,wchar_t> converterX;returnconverterX.from_bytes(str); }st...
EXPECT_EQ(r2,"100--#-- -40.20--#-- String");conststd::stringr3 = StandardLibrary::Format("{0}--#--{1,8}--#--{1}",100, -40.2f); EXPECT_EQ(r3,"100--#-- -40.20--#---40.20");conststd::stringr4 = StandardLibrary::Format("{0}--#--{1,8}--#--{3}",100, -40.2f...
然而,std::basic_string对象通常不能为constexpr,因为任何动态分配的存储都必须在相同的常量表达式求值中释放。 (C++20 起) 提供数个对于常用字符类型的 typedef: 在标头<string>定义 类型定义 std::stringstd::basic_string<char> std::wstringstd::basic_string<wchar_t> ...
double stod( const std::string& str, std::size_t* pos = 0 ); double stod( const std::wstring& str, std::size_t* pos = 0 ); Return Value: 返回double类型的值参数 str : 要转换的字符串 pos : 存储处理的字符数的整数的地址。此参数也可以是空指针,在这种情况下不使用它。 代...
类模板std::wstring_convert用单独的编码转换刻面Codecvt,进行字节字符串std::string和宽字符串std::basic_string<Elem>间的转换。std::wstring_convert假定拥有转换刻面的所有权,而不能使用本地环境所管理的刻面。 适用于std::wstring_convert的标准刻面对于 UTF-8/UCS2 和 UTF-8/UCS4 转换是std::codecvt_utf8...
bool ret = m_book->load(m_excelFileName.toStdWString().c_str());//把QString转为wchar_t* if (!ret) { setError(QString(m_book->errorMessage())); emit error(); return false; } //查找题库工作表 m_sheet = NULL; ...
[jn@jn example]$ ./iniExample get rtsp port:555 to string: rtsp.port = 554 to string: math.PI = 3.1415926 to string: math.PI = 3.1415926 to double: math.PI = 3.1415926 to int: math.PI = 3 to wstring: other.desc= 你好,世界 [jn@jn example]$ - 生成 `config.ini` 代码语言:txt...
std::basic_string<CharT,Traits,Alloc> generic_string(constAlloc&a=Alloc())const; (1)(since C++17) (2)(since C++17) std::stringgeneric_string()const; std::wstringgeneric_wstring()const; std::u16stringgeneric_u16string()const; std::u32stringgeneric_u32string()const; ...
float stof( const string& str, size_t* pos = 0 );float stof( const wstring& str, size_t* pos = 0 );参数str : 要转换的字符串pos : 用于存储已处理字符数的整数的地址此参数也可以是空指针,在这种情况下,不使用此参数。Return value: 返回float类型的值。复制代码 ...
I am a bit lost on why string_t is different between linux and windows. My current issue is that I have a boot::filesystem::path that I can convert to a std::wstring and that I would like to put in a CppRestSDK Json. How can I do that ? On Linux it complains that there is...