C ++ coding strings

Not much nonsense. Go to the Code:

#include <iostream>#include <string>#include <windows.h>using namespace std;class CEncodeString{public:CEncodeString();~CEncodeString();void LoadString(char *,int =ansi);void LoadString(WCHAR *);enum{ansi,unicode,utf8};wstring ToUnicode();string ToAnsi();string ToUtf8();string GetUnicodeHeader();string GetUtf8Header();private:string m_str;};CEncodeString::CEncodeString(){}CEncodeString::~CEncodeString(){}void CEncodeString::LoadString(char *str,int mode/* =ansi */){if(mode==ansi){string strTemp;strTemp+=str[0];strTemp+=str[1];if(strTemp==GetUnicodeHeader()){LoadString((WCHAR*)(str+2));return;}strTemp+=str[2];if(strTemp==GetUtf8Header()){str+=3;mode=utf8;}else{m_str=str;}}if(mode==utf8){int wcsLen = ::MultiByteToWideChar(CP_UTF8, NULL, str, strlen(str), NULL, 0); wchar_t* wszString = new wchar_t[wcsLen + 1]; ::MultiByteToWideChar(CP_UTF8, NULL, str, strlen(str), wszString, wcsLen); wszString[wcsLen] = '\0'; int ansiLen = ::WideCharToMultiByte(CP_ACP, NULL, wszString, wcslen(wszString), NULL, 0, NULL, NULL); char* szAnsi = new char[ansiLen + 1]; ::WideCharToMultiByte(CP_ACP, NULL, wszString, wcslen(wszString), szAnsi, ansiLen, NULL, NULL); szAnsi[ansiLen] = '\0'; m_str=szAnsi;delete[] wszString;delete[] szAnsi;}}void CEncodeString::LoadString(WCHAR *wStr){int ansiLen = ::WideCharToMultiByte(CP_ACP, NULL, wStr, wcslen(wStr), NULL, 0, NULL, NULL); char* szAnsi = new char[ansiLen + 1]; ::WideCharToMultiByte(CP_ACP, NULL, wStr, wcslen(wStr), szAnsi, ansiLen, NULL, NULL); szAnsi[ansiLen] = '\0'; m_str=szAnsi;delete[] szAnsi;}wstring CEncodeString::ToUnicode(){char* szAnsi =(char*)m_str.data();     int wcsLen = ::MultiByteToWideChar(CP_ACP, NULL, szAnsi, strlen(szAnsi), NULL, 0);     wchar_t* wszString = new wchar_t[wcsLen + 1];     ::MultiByteToWideChar(CP_ACP, NULL, szAnsi, strlen(szAnsi), wszString, wcsLen);     wszString[wcsLen] = '\0'; wstring wStr=wszString;delete[] wszString;return wStr;}string CEncodeString::ToAnsi(){return m_str;}string CEncodeString::ToUtf8(){wstring wStr=ToUnicode();wchar_t* wszString =(wchar_t*) wStr.data();     int u8Len = ::WideCharToMultiByte(CP_UTF8, NULL, wszString, wcslen(wszString), NULL, 0, NULL, NULL);     char* szU8 = new char[u8Len + 1];     ::WideCharToMultiByte(CP_UTF8, NULL, wszString, wcslen(wszString), szU8, u8Len, NULL, NULL);     szU8[u8Len] = '\0'; string strUtf8=szU8;delete[] szU8;return strUtf8;}string CEncodeString::GetUnicodeHeader(){return "\xff\xfe";}string CEncodeString::GetUtf8Header(){return "\xef\xbb\xbf";}main(){setlocale(LC_CTYPE, "");  FILE *f=fopen("d:\\json.txt","rb");char buf[100]={0};fread(buf,1,100,f);fclose(f);CEncodeString encode;encode.LoadString(buf);cout<<encode.ToAnsi()<<endl;}

This class will automatically parse the header information of the string, determine whether it is Unicode, utf8, or ANSI, and then perform corresponding processing. Of course, the storage method of the string in the class is ANSI.

I hope you can correct the shortcomings in this article.