const std::string转换为const wchar_t* string

本文介绍如何将const std::string类型的字符串转换为const wchar_t*类型,适用于需要进行宽字符编码处理的情况。通过使用MultiByteToWideChar函数实现从多字节到宽字符的转换,并详细展示了具体的C++代码实现。

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由const std::string转换为const wchar_t* string

c++代码:

const std::string text = "汉语";

std::wstring szDst;
		{
			int len = MultiByteToWideChar(CP_ACP, 0, (LPCSTR)text.c_str(), -1, NULL, 0);
			wchar_t *wszUtf8 = new wchar_t[len + 1];
			memset(wszUtf8, 0, len * 2 + 2);
			MultiByteToWideChar(CP_ACP, 0, (LPCSTR)text.c_str(), -1, (LPWSTR)wszUtf8, len);
			szDst = wszUtf8;
			delete[]wszUtf8;
		}
const wchar_t* string result = 
szDst.c_str();




49725@DESKTOP-CB4LRLP /cygdrive/f/S $ g++ -o screensaver_clock F:/S/screensaver_clock.cpp -lgdiplus -mwindows F:/S/screensaver_clock.cpp: In function 'void SetFontSize(HWND)': F:/S/screensaver_clock.cpp:21:54: error: no matching function for call to 'std::basic_ofstream<wchar_t>::open(std::__cxx11::wstring&, const openmode&)' logFile.open(g_runtimeFilePath, std::ios::app); ^ In file included from F:/S/screensaver_clock.cpp:2: D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:851:7: note: candidate: 'void std::basic_ofstream<_CharT, _Traits>::open(const char*, std::ios_base::openmode) [with _CharT = wchar_t; _Traits = std::char_traits<wchar_t>; std::ios_base::openmode = std::_Ios_Openmode]' open(const char* __s, ios_base::openmode __mode = ios_base::out) ^~~~ D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:851:7: note: no known conversion for argument 1 from 'std::__cxx11::wstring' {aka 'std::__cxx11::basic_string<wchar_t>'} to 'const char*' D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:871:7: note: candidate: 'void std::basic_ofstream<_CharT, _Traits>::open(const string&, std::ios_base::openmode) [with _CharT = wchar_t; _Traits = std::char_traits<wchar_t>; std::__cxx11::string = std::__cxx11::basic_string<char>; std::ios_base::openmode = std::_Ios_Openmode]' open(const std::string& __s, ios_base::openmode __mode = ios_base::out) ^~~~ D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:871:7: note: no known conversion for argument 1 from 'std::__cxx11::wstring' {aka 'std::__cxx11::basic_string<wchar_t>'} to 'const string&' {aka 'const std::__cxx11::basic_string<char>&'} F:/S/screensaver_clock.cpp: In function 'void SetTitle(HWND)': F:/S/screensaver_clock.cpp:32:54: error: no matching function for call to 'std::basic_ofstream<wchar_t>::open(std::__cxx11::wstring&, const openmode&)' logFile.open(g_runtimeFilePath, std::ios::app); ^ In file included from F:/S/screensaver_clock.cpp:2: D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:851:7: note: candidate: 'void std::basic_ofstream<_CharT, _Traits>::open(const char*, std::ios_base::openmode) [with _CharT = wchar_t; _Traits = std::char_traits<wchar_t>; std::ios_base::openmode = std::_Ios_Openmode]' open(const char* __s, ios_base::openmode __mode = ios_base::out) ^~~~ D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:851:7: note: no known conversion for argument 1 from 'std::__cxx11::wstring' {aka 'std::__cxx11::basic_string<wchar_t>'} to 'const char*' D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:871:7: note: candidate: 'void std::basic_ofstream<_CharT, _Traits>::open(const string&, std::ios_base::openmode) [with _CharT = wchar_t; _Traits = std::char_traits<wchar_t>; std::__cxx11::string = std::__cxx11::basic_string<char>; std::ios_base::openmode = std::_Ios_Openmode]' open(const std::string& __s, ios_base::openmode __mode = ios_base::out) ^~~~ D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:871:7: note: no known conversion for argument 1 from 'std::__cxx11::wstring' {aka 'std::__cxx11::basic_string<wchar_t>'} to 'const string&' {aka 'const std::__cxx11::basic_string<char>&'} F:/S/screensaver_clock.cpp: In function 'void SetCountdownDate(HWND)': F:/S/screensaver_clock.cpp:43:54: error: no matching function for call to 'std::basic_ofstream<wchar_t>::open(std::__cxx11::wstring&, const openmode&)' logFile.open(g_runtimeFilePath, std::ios::app); ^ In file included from F:/S/screensaver_clock.cpp:2: D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:851:7: note: candidate: 'void std::basic_ofstream<_CharT, _Traits>::open(const char*, std::ios_base::openmode) [with _CharT = wchar_t; _Traits = std::char_traits<wchar_t>; std::ios_base::openmode = std::_Ios_Openmode]' open(const char* __s, ios_base::openmode __mode = ios_base::out) ^~~~ D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:851:7: note: no known conversion for argument 1 from 'std::__cxx11::wstring' {aka 'std::__cxx11::basic_string<wchar_t>'} to 'const char*' D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:871:7: note: candidate: 'void std::basic_ofstream<_CharT, _Traits>::open(const string&, std::ios_base::openmode) [with _CharT = wchar_t; _Traits = std::char_traits<wchar_t>; std::__cxx11::string = std::__cxx11::basic_string<char>; std::ios_base::openmode = std::_Ios_Openmode]' open(const std::string& __s, ios_base::openmode __mode = ios_base::out) ^~~~ D:/wingcc/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/fstream:871:7: note: no known conversion for argument 1 from 'std::__cxx11::wstring' {aka 'std::__cxx11::basic_string<wchar_t>'} to 'const string&' {aka 'const std::__cxx11::basic_string<char>&'}报错,优化代码,代码全输出
05-13
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