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  • 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, 0, utf8string.c_str(), -1, NULL, 0);
            if (widesize == ERROR_NO_UNICODE_TRANSLATION)
            {
                throw std::exception("Invalid UTF-8 sequence.");
            }
            if (widesize == 0)
            {
                throw std::exception("Error in conversion.");
            }
            std::vector<wchar_t> resultstring(widesize);
            int convresult = ::MultiByteToWideChar(CP_UTF8, 0, utf8string.c_str(), -1, &resultstring[0], widesize);
            if (convresult != widesize)
            {
                throw std::exception("La falla!");
            }
            return std::wstring(&resultstring[0]);
        }
    
    
        //unicode 转为 ascii 
        std::string WideByte2Acsi(std::wstring& wstrcode){
            int asciisize = ::WideCharToMultiByte(CP_OEMCP, 0, wstrcode.c_str(), -1, NULL, 0, NULL, NULL);
            if (asciisize == ERROR_NO_UNICODE_TRANSLATION)
            {
                throw std::exception("Invalid UTF-8 sequence.");
            }
            if (asciisize == 0)
            {
                throw std::exception("Error in conversion.");
            }
            std::vector<char> resultstring(asciisize);
            int convresult = ::WideCharToMultiByte(CP_OEMCP, 0, wstrcode.c_str(), -1, &resultstring[0], asciisize, NULL, NULL);
            if (convresult != asciisize)
            {
                throw std::exception("La falla!");
            }
            return std::string(&resultstring[0]);
        }
    
    
    
        //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, 0, (char*)strascii.c_str(), -1, NULL, 0);
            if (widesize == ERROR_NO_UNICODE_TRANSLATION)
            {
                throw std::exception("Invalid UTF-8 sequence.");
            }
            if (widesize == 0)
            {
                throw std::exception("Error in conversion.");
            }
            std::vector<wchar_t> resultstring(widesize);
            int convresult = MultiByteToWideChar(CP_ACP, 0, (char*)strascii.c_str(), -1, &resultstring[0], widesize);
            if (convresult != widesize)
            {
                throw std::exception("La falla!");
            }
            return std::wstring(&resultstring[0]);
        }
    
    
        //Unicode 转 Utf8 
        std::string Unicode2Utf8(const std::wstring& widestring){
            using namespace std;
            int utf8size = ::WideCharToMultiByte(CP_UTF8, 0, widestring.c_str(), -1, NULL, 0, NULL, NULL);
            if (utf8size == 0)
            {
                throw std::exception("Error in conversion.");
            }
            std::vector<char> resultstring(utf8size);
            int convresult = ::WideCharToMultiByte(CP_UTF8, 0, widestring.c_str(), -1, &resultstring[0], utf8size, NULL, NULL);
            if (convresult != utf8size)
            {
                throw std::exception("La falla!");
            }
            return std::string(&resultstring[0]);
        }
    
    
        //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

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  • 原文地址:https://www.cnblogs.com/rixiang/p/9530367.html
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