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深入理解c++中char*与wchar_t*与string以及wstring之间的相互转换

运维开发网 https://www.qedev.com 2020-02-13 15:06 出处:网络 作者: 网络整理
本篇文章是对c++中的char*与wchar_t*与string以及wstring之间的相互转换进行了详细的分析介绍,需要的朋友参考下
复制代码 代码如下:

    #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; 

复制代码 代码如下:

    #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()函数来进行转换,道理一样.

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