深入理解c++中char與wchar_t與string以及wstring之間的相互轉換

2019-11-06 08:15:52

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復制代碼代碼如下: #ifndef USE_H_ #define USE_H_ #include <iostream> #include <windows.h> #include <string> using namespace std; class CUser { public: CUser(); virtual~ CUser(); char* WcharToChar(const wchar_t* wp); char* StringToChar(const string& s); char* WstringToChar(const wstring& ws); wchar_t* CharToWchar(const char* c); wchar_t* WstringToWchar(const wstring& ws); wchar_t* StringToWchar(const string& s); wstring StringToWstring(const string& s); string WstringToString(const wstring& ws); void Release(); PRivate: char* m_char; wchar_t* m_wchar; }; #endif; 復制代碼代碼如下: #include “stdafx.h” #include “use.h” CUser::CUser() :m_char(NULL) ,m_wchar(NULL) { } CUser::~CUser() { Release(); } char* CUser::WcharToChar(const wchar_t* wp) { Release(); int len= WideCharToMultiByte(CP_ACP,0,wp,wcslen(wp),NULL,0,NULL,NULL); m_char=new char[len+1]; WideCharToMultiByte(CP_ACP,0,wp,wcslen(wp),m_char,len,NULL,NULL); m_char[len]=’/0’; return m_char; } wchar_t* CUser::CharToWchar(const char* c) { Release(); int len = MultiByteToWideChar(CP_ACP,0,c,strlen(c),NULL,0); m_wchar=new wchar_t[len+1]; MultiByteToWideChar(CP_ACP,0,c,strlen(c),m_wchar,len); m_wchar[len]=’/0’; return m_wchar; } void CUser::Release() { if(m_char) { delete m_char; m_char=NULL; } if(m_wchar) { delete m_wchar; m_wchar=NULL; } } char* CUser::StringToChar(const string& s) { return const_cast<char*>(s.c_str()); } char* CUser::WstringToChar(const std::wstring &ws) { const wchar_t* wp=ws.c_str(); return WcharToChar(wp); } wchar_t* CUser::WstringToWchar(const std::wstring &ws) { return const_cast<wchar_t*>(ws.c_str()); } wchar_t* CUser::StringToWchar(const string& s) { const char* p=s.c_str(); return CharToWchar(p); } string CUser::WstringToString(const std::wstring &ws) { string s; char* p=WstringToChar(ws); s.append(p); return s; } wstring CUser::StringToWstring(const std::string &s) { wstring ws; wchar_t* wp=StringToWchar(s); ws.append(wp); return ws; } 如果涉及到CString，可以利用CString::GetBuffer()函數來進行轉換，道理一樣.

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