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宽字符串和标准字符串的转换

yoours2010-05-17 10:34:10 阅读 1156

简介一边听听音乐，一边写写文章。

//1
string WstringToString(wstring str)
{
    const wchar_t *pwc=str.c_str();
    int nLen=WideCharToMultiByte(CP_ACP,0,(LPCWSTR)pwc,-1,NULL,0,NULL,NULL);
    if(nLen<=0) return string("");
    char *presult=new char[nLen];
    if (NULL==presult) return string("");
    WideCharToMultiByte(CP_ACP,0,(LPCWSTR)pwc,-1,presult,nLen,NULL,NULL);
    presult[nLen-1]=0;
    string result(presult);
    delete[] presult;
    return result;
}
wstring StringToWstring(string str)
{
    const char *pstr=str.c_str();
    int nLen=str.size();
    int nSize=MultiByteToWideChar(CP_ACP,0,(LPCSTR)pstr,nLen,0,0);
    if (nSize<=0) return NULL;
    WCHAR *pDst=new WCHAR[nSize+1];
    if (pDst==NULL)return NULL;
    MultiByteToWideChar(CP_ACP,0,(LPCSTR)pstr,nLen,pDst,nSize);
    pDst[nSize]=0;
    if (pDst[0]==0xFEFF)
    {
        for (int i=0;i<nSize;i++)
        {
            pDst=pDst[i+1];
        }
    }
    wstring wcstr(pDst);
    delete []pDst;
    return wcstr;
}

//2
class auto_setlocate
{
   public:
       auto_setlocate()
       {
           setlocale(LC_ALL, "");
       }
};

std::string wstring2string(const wchar_t* wsz)
    {
        static auto_setlocate as;
        std::string ret(wcslen(wsz)*2, '\0');
        std::wcstombs(const_cast<char*>(ret.c_str()), wsz, ret.length());
        return ret;
    }

    std::string wstring2string(const std::wstring& wstr)
    {
        static auto_setlocate as;
        std::string ret(wstr.length()*2, '\0');
        std::wcstombs(const_cast<char*>(ret.c_str()), wstr.c_str(), wstr.length());
        return ret;
    }

    std::wstring string2wstring(const char* sz)
    {
        static auto_setlocate as;
        std::wstring ret(strlen(sz), '\0');
        std::mbstowcs(const_cast<wchar_t*>(ret.c_str()), sz, ret.length());
        return ret;
    }

    std::wstring string2wstring(const std::string& str)
    {
        static auto_setlocate as;
        std::wstring ret(str.length(), '\0');
        std::mbstowcs(const_cast<wchar_t*>(ret.c_str()), str.c_str(), str.length());
        return ret;
    }

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