解决C++项目使用sqlite中文乱码问题

我参考的是这篇文章：https://www.2cto.com/database/201411/354891.html

理论是：sqlite使用的是UTF-8，C++中用的字符串是ascii或unicode编码。

所以使用时候要进行转化。插入中文时候要转化为UTF-8，读取时候再转化回来。

下面是转化函数，参考文章：https://www.2cto.com/database/201411/354891.html

    //UTF-8转Unicode
    std::wstring Utf82Unicode(const std::string& utf8string) {
        int widesize = ::MultiByteToWideChar(CP_UTF8, , utf8string.c_str(), -, NULL, );
        if (widesize == ERROR_NO_UNICODE_TRANSLATION)
        {
            throw std::exception("Invalid UTF-8 sequence.");
        }
        if (widesize == )
        {
            throw std::exception("Error in conversion.");
        }
        std::vector<wchar_t> resultstring(widesize);
        int convresult = ::MultiByteToWideChar(CP_UTF8, , utf8string.c_str(), -, &resultstring[], widesize);
        if (convresult != widesize)
        {
            throw std::exception("La falla!");
        }
        return std::wstring(&resultstring[]);
    }

    //unicode 转为 ascii
    std::string WideByte2Acsi(std::wstring& wstrcode){
        int asciisize = ::WideCharToMultiByte(CP_OEMCP, , wstrcode.c_str(), -, NULL, , NULL, NULL);
        if (asciisize == ERROR_NO_UNICODE_TRANSLATION)
        {
            throw std::exception("Invalid UTF-8 sequence.");
        }
        if (asciisize == )
        {
            throw std::exception("Error in conversion.");
        }
        std::vector<char> resultstring(asciisize);
        int convresult = ::WideCharToMultiByte(CP_OEMCP, , wstrcode.c_str(), -, &resultstring[], asciisize, NULL, NULL);
        if (convresult != asciisize)
        {
            throw std::exception("La falla!");
        }
        return std::string(&resultstring[]);
    }

    //utf-8 转 ascii
    std::string UTF_82ASCII(std::string& strUtf8Code){
        using namespace std;
        string strRet = "";
        //先把 utf8 转为 unicode
        wstring wstr = Utf82Unicode(strUtf8Code);
        //最后把 unicode 转为 ascii
        strRet = WideByte2Acsi(wstr);
        return strRet;
    }

    //ascii 转 Unicode
    std::wstring Acsi2WideByte(std::string& strascii){
        using namespace std;
        int widesize = MultiByteToWideChar(CP_ACP, , (char*)strascii.c_str(), -, NULL, );
        if (widesize == ERROR_NO_UNICODE_TRANSLATION)
        {
            throw std::exception("Invalid UTF-8 sequence.");
        }
        if (widesize == )
        {
            throw std::exception("Error in conversion.");
        }
        std::vector<wchar_t> resultstring(widesize);
        int convresult = MultiByteToWideChar(CP_ACP, , (char*)strascii.c_str(), -, &resultstring[], widesize);
        if (convresult != widesize)
        {
            throw std::exception("La falla!");
        }
        return std::wstring(&resultstring[]);
    }

    //Unicode 转 Utf8
    std::string Unicode2Utf8(const std::wstring& widestring){
        using namespace std;
        int utf8size = ::WideCharToMultiByte(CP_UTF8, , widestring.c_str(), -, NULL, , NULL, NULL);
        if (utf8size == )
        {
            throw std::exception("Error in conversion.");
        }
        std::vector<char> resultstring(utf8size);
        int convresult = ::WideCharToMultiByte(CP_UTF8, , widestring.c_str(), -, &resultstring[], utf8size, NULL, NULL);
        if (convresult != utf8size)
        {
            throw std::exception("La falla!");
        }
        return std::string(&resultstring[]);
    }

    //ascii 转 Utf8
    std::string ASCII2UTF_8(std::string& strAsciiCode) {
        using namespace std;
        string strRet("");
        //先把 ascii 转为 unicode
        wstring wstr = Acsi2WideByte(strAsciiCode);
        //最后把 unicode 转为 utf8
        strRet = Unicode2Utf8(wstr);
        return strRet;
    }

使用效果立竿见影：

可以看出，之前存进数据库的是乱码

改变之后已经成功将汉字存进去了