这是由于sqlite数据库使用的是UTF-8编码方式，而传入的字符串是ASCII编码或Unicode编码，导致字符串格式错误。解决方案是在调用sqlite接口之前，先将字符串转换成UTF-8编码，以下提供各种字符串编码转换函数。

<pre name="code" class="cpp">//UTF-8转Unicode 
std::wstring Utf82Unicode(const std::string& utf8string) 
{ 
int widesize = ::MultiByteToWideChar(CP_UTF8,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,&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,wstrcode.c_str(),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,asciisize,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,(char*)strascii.c_str(),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,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,widestring.c_str(),NULL); 
if (utf8size == 0) 
{ 
throw std::exception("Error in conversion."); 
} 
std::vector<char> resultstring(utf8size); 
int convresult = ::WideCharToMultiByte(CP_UTF8,utf8size,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; 
}