TCHAR和CHAR类型的互转,string 转lpcwstr

https://www.cnblogs.com/yuguangyuan/p/5955959.html

没有定义UNICODE，所以它里面的字符串就是简单用" "就行了，创建工程的时候包含了UNICODE定义，就必须对TCHAR和char进行转换。

void TcharToChar(const TCHAR * tchar, char * _char)
{
    int iLength;
    //获取字节长度   
    iLength = WideCharToMultiByte(CP_ACP, 0, tchar, -1, NULL, 0, NULL, NULL);
    //将tchar值赋给_char    
    WideCharToMultiByte(CP_ACP, 0, tchar, -1, _char, iLength, NULL, NULL);
}

void CharToTchar(const char * _char, TCHAR * tchar)
{
    int iLength;
    iLength = MultiByteToWideChar(CP_ACP, 0, _char, strlen(_char) + 1, NULL, 0);
    MultiByteToWideChar(CP_ACP, 0, _char, strlen(_char) + 1, tchar, iLength);
}

表明 TCHAR 与 WCHAR 属同一类型
char szA[100];                    // ANSI string buffer
WCHAR szW[100];            // Unicode string buffer
// Normal sprintf:all strings are ANSI
sprintf(szA, "%s","ANSI Str");
// Converts Unicode string to ANSI
sprintf(szA,"%S",L"Unicode Str");
// Normal swprintf:all strings are Unicode
swprintf(szW,L"%s",L"Unicode Str");
// Converts ANSI string to Unicode
swprintf(szW,L"%S", "ANSI Str");
注意：大写S 和小写s 的使用

 string 转lpcwstr 

    LPCWSTR stringToLPCWSTR(std::string orig)
    {
        wchar_t *wcstring = 0;
        try{
            size_t origsize = orig.length() + 1;
            const size_t newsize = 100;size_t convertedChars = 0;
            if (orig == ""){wcstring = (wchar_t *)malloc(0);
                mbstowcs_s(&convertedChars, wcstring, origsize, orig.c_str(), _TRUNCATE);
            }
            else{
                wcstring = (wchar_t *)malloc(sizeof(wchar_t)*(orig.length() - 1));
                mbstowcs_s(&convertedChars, wcstring, origsize, orig.c_str(), _TRUNCATE);
            }
        }
        catch (std::exception e)
        {}
        return wcstring;
    }

std::string to_s(LPCWSTR ws)
{
    DWORD length = WideCharToMultiByte(CP_OEMCP, NULL, ws, -1, NULL, 0, NULL, FALSE);
    std::string result(length, 0);
    WideCharToMultiByte(CP_OEMCP, NULL, ws, -1, &result[0], length, NULL, FALSE);
    result.erase(result.size() - 1, 1);
    return result;
}

std::wstring to_ws(LPCSTR str)
{
    int length = MultiByteToWideChar(GetACP(), 0, str, -1, NULL, 0);
    std::wstring result(length, 0);
    MultiByteToWideChar(GetACP(), 0, str, -1, &result[0], length);
    return result;
}