Unicode与Ansi及UTF8与Ansi之间的转换

char* UnicodeToAnsi(const wchar_t *szUnicode)
{
int nLenSrc=wcslen(szUnicode);
int nLenDest = ::WideCharToMultiByte(CP_ACP,NULL,szUnicode,nLenSrc,NULL,0,NULL,NULL);
if(nLenDest<=0)
return NULL;
char* pszDest = new char[nLenDest+1];
if (!pszDest)
return NULL;
memset(pszDest,0,(nLenDest+1)*sizeof(char));
::WideCharToMultiByte(CP_ACP,NULL,szUnicode,nLenSrc,pszDest,nLenDest,NULL,NULL);
return pszDest;
}

wchar_t* AnsiToUnicode(const char *szAnsi)
{
int nLenSrc = strlen(szAnsi);
// 计算需要的宽字符数（MultiByteToWideChar的最后一个参数如果给0，则返回需要的宽字符数,包括末尾的'\0'）
// 如果第四个参数给-1，那么MultiByteToWideChar会自动计算szAnsi的长度
int nCharactersNumber =::MultiByteToWideChar(CP_ACP,0,szAnsi,nLenSrc,NULL,0);
int nLenDest = nCharactersNumber * sizeof(wchar_t);
wchar_t *pstrDest = new wchar_t[nLenDest];
if (!pstrDest)
return NULL;
wmemset(pstrDest,0,nLenDest);
::MultiByteToWideChar(CP_ACP,0,szAnsi,-1,pstrDest,nCharactersNumber);
return pstrDest;
}

char* Utf8ToAnsi(const char *szUTF8)
{
int nLen = MultiByteToWideChar(CP_UTF8, 0, szUTF8, -1, NULL, NULL);
LPWSTR lpwsz = new WCHAR[nLen];
MultiByteToWideChar(CP_UTF8, 0, szUTF8, -1, lpwsz, nLen);
int nLen1 = WideCharToMultiByte(CP_ACP, 0, lpwsz, nLen, NULL, NULL, NULL, NULL);
LPSTR lpsz = new CHAR[nLen1];
WideCharToMultiByte(CP_ACP, 0, lpwsz, nLen, lpsz, nLen1, NULL, NULL);
delete []lpwsz;
return lpsz;
}

char* AnsiToUtf8( const char *szANSI)
{
int nLen = MultiByteToWideChar(CP_ACP, 0, szANSI, -1, NULL, NULL);
LPWSTR lpwsz = new WCHAR[nLen];
MultiByteToWideChar(CP_ACP, 0, szANSI, -1, lpwsz, nLen);
int nLen1 = WideCharToMultiByte(CP_UTF8, 0, lpwsz, nLen, NULL, NULL, NULL, NULL);
LPSTR lpsz = new CHAR[nLen1];
WideCharToMultiByte(CP_UTF8, 0, lpwsz, nLen, lpsz, nLen1, NULL, NULL);
delete []lpwsz;
return lpsz;
}