菜单

sqlite中文乱码问题原因分析及解决,utf8编码的解码

2020年2月26日 - 4166am金沙下载

UTF8Decode
Utf8ToAnsi
UTF8Decode
UTF8Encode

复制代码 代码如下:

成效: utf8编码的解码 ** 输入参数: **
作者:liubin **日期:2011-02-15 ** Str :要分开的字符串 ** EndStr
:分割符号 **归来值 :重临截取好的…

下边笔者是把UTF-8编码的XML 载入MEMO 的代码

那是出于sqlite数据库使用的是UTF-8编码方式,而传出的字符串是ASCII编码或Unicode编码,引致字符串格式错误。技术方案是在调用sqlite接口早前,先将字符串转变到UTF-8编码,以下提供种种字符串编码转换函数。

  ** 作者:liubin

procedure TForm1.Button1Click(Sender: TObject);
var s:string;
 tt:TMemoryStream;
 i:Integer;
 Filebuf: array of pchar;
begin
  i:=0;
  tt:=TMemoryStream.Create;
  tt.LoadFromFile('1.xml');
  i:=tt.Size ;
  SetLength(FileBuf,i);
  tt.ReadBuffer(FileBuf[0],i);
  s:=StrPas(@Filebuf[0]);
  S := Utf8ToAnsi(s)  ;
  memo1.Lines.Text:= S     ;
  end;

//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.”);
}
4166am金沙下载,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
string WideByte2Acsi(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
string UTF_82ASCII(string& strUtf8Code)
{
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
wstring Acsi2WideByte(string& strascii)
{
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)
{
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
string ASCII2UTF_8(string& strAsciiCode)
{
string strRet(“”);
//先把 ascii 转为 unicode
wstring wstr = Acsi2WideByte(strAsciiCode);
//最后把 unicode 转为 utf8
strRet = Unicode2Utf8(wstr);
return strRet;
}

** 成效: utf8编码的解码
  ** 输入参数:

相关文章

发表评论

电子邮件地址不会被公开。 必填项已用*标注

网站地图xml地图