Visual Studio中设置字符编码转换

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一、byte转int

byte一般定义为unsigned char，占一个字节，int是四个字节，所以byte转int一般是byte型的数组转int。实现如下：

int Byte2Int( BYTE* lpByte, int nLpByte ){int iRetVal = lpByte[0] & 0xFF;  if(nLpByte > 1) iRetVal |= ((lpByte[1] << 8) & 0xFF00);  if(nLpByte > 2) iRetVal |= ((lpByte[2] << 16) & 0xFF0000);  if(nLpByte > 3) iRetVal |= ((lpByte[3] << 24) & 0xFF000000); return iRetVal;}

二、int转byte

int转byte类型的数组，需要指定byte型数组的位数，也就是说，这个函数支持将int类型分别转换成1、2、3、4位byte。

BYTE* Int2Byte( int n, int nLpByte/*=4*/ ){BYTE* lpByte = new BYTE[nLpByte];lpByte[0] = (byte)(0xFF & n);if(nLpByte>1) lpByte[1] = (byte)((n & 0xFF00)>>8);if(nLpByte>2) lpByte[2] = (byte)((n & 0xFF0000)>>16);if(nLpByte>3) lpByte[3] = (byte)((n & 0xFF000000)>>24);return lpByte;}

三、char*转CString

如果是string的话，可以使用c_str()。

void Char2CString(const char* data,CString & str){#ifdef UNICODEint len=MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)data, -1, NULL,0);unsigned short * wszGBK = new unsigned short[len+1];memset(wszGBK, 0, len * 2 + 2);MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)data, -1, reinterpret_cast<TCHAR *>(wszGBK), len); str.Format(_T("%s"),wszGBK);delete[] wszGBK;#elseWCHAR* strA;int i= MultiByteToWideChar ( CP_UTF8 , 0 ,(char*) data ,-1 ,NULL,0);strA = new WCHAR[i+1];MultiByteToWideChar ( CP_UTF8 , 0 ,( char * ) data, -1, strA , i);i= WideCharToMultiByte(CP_ACP,0,strA,-1,NULL,0,NULL,NULL);char *strB=new char[i+1];WideCharToMultiByte (CP_ACP,0,strA,-1,strB,i,NULL,NULL);str.Format(_T("%s"),strB);delete []strA;delete []strB;//AfxMessageBox(str);#endif}

四、CString转char*

//要求pChar必须有足够的空间void CString2Char(const CString& str,char* pChar){int len = 0;if (!pChar){return;}#ifdef UNICODElen = WideCharToMultiByte(CP_UTF8, 0, str, -1, NULL, 0, NULL, NULL); memset(pChar, 0, len + 1);WideCharToMultiByte (CP_UTF8, 0, str, -1, pChar, len, NULL,NULL);return;#elseif (str.IsEmpty()){return NULL;}char* pStr;int l = str.GetLength();int i;pStr = new char[l+1];sprintf(pStr,_T("%s"),str);TRACE(_T("%s\n"),pStr);i= MultiByteToWideChar(CP_ACP, 0 ,(char*) pStr ,l+1 ,NULL,0);WCHAR *strC=new WCHAR[i];MultiByteToWideChar (CP_ACP, 0 ,(char*) pStr ,l+1 ,strC,i);i= WideCharToMultiByte(CP_UTF8,0,strC,-1,NULL,0,NULL,NULL);//char *strD=new char[i];WideCharToMultiByte (CP_UTF8,0,strC,-1,pChar,i,NULL,NULL);len = i-1;delete []pStr;delete []strC;return;#endif}

五、UTF8编码的字符串和CString之间互转

void ConvertUTF8ToCString(void * strUtf8 ,CString & str){#ifdef UNICODEint len=MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)strUtf8, -1, NULL,0);unsigned short * wszGBK = new unsigned short[len+1];memset(wszGBK, 0, len * 2 + 2);MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)strUtf8, -1, reinterpret_cast<TCHAR *>(wszGBK), len); str.Format(_T("%s"),wszGBK);delete[] wszGBK;#elseWCHAR* strA;int i= MultiByteToWideChar ( CP_UTF8 , 0 ,(char*) strUtf8 ,-1 ,NULL,0);strA = new WCHAR[i+1];MultiByteToWideChar ( CP_UTF8 , 0 ,( char * ) strUtf8, -1, strA , i);i= WideCharToMultiByte(CP_ACP,0,strA,-1,NULL,0,NULL,NULL);char *strB=new char[i+1];WideCharToMultiByte (CP_ACP,0,strA,-1,strB,i,NULL,NULL);str.Format(_T("%s"),strB);delete []strA;delete []strB;#endif}char*  ConvertCStringToUTF8(CString &str,int &len){#ifdef UNICODElen = WideCharToMultiByte(CP_UTF8, 0, str, -1, NULL, 0, NULL, NULL); char *szUtf8=new char[len + 1];memset(szUtf8, 0, len + 1);WideCharToMultiByte (CP_UTF8, 0, str, -1, szUtf8, len, NULL,NULL);len = len-1;return szUtf8;#elseif (str.IsEmpty()){return NULL;}char* pStr;int l = str.GetLength();int i;pStr = new char[l+1];sprintf(pStr,_T("%s"),str);TRACE(_T("%s\n"),pStr);i= MultiByteToWideChar(CP_ACP, 0 ,(char*) pStr ,l+1 ,NULL,0);WCHAR *strC=new WCHAR[i];MultiByteToWideChar (CP_ACP, 0 ,(char*) pStr ,l+1 ,strC,i);i= WideCharToMultiByte(CP_UTF8,0,strC,-1,NULL,0,NULL,NULL);char *strD=new char[i];WideCharToMultiByte (CP_UTF8,0,strC,-1,strD,i,NULL,NULL);len = i-1;delete []pStr;delete []strC;return strD;#endif}

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