C++ UTF8 互转 Unicode

C++/MFC   UTF8 转 Unicode

char* U8ToUnicode(char* szU8) { //UTF8 to Unicode //预转换，得到所需空间的大小 int wcsLen = ::MultiByteToWideChar(CP_UTF8, NULL, szU8, strlen(szU8), NULL, 0); //分配空间要给'\0'留个空间，MultiByteToWideChar不会给'\0'空间 wchar_t* wszString = new wchar_t[wcsLen + 1]; //转换 ::MultiByteToWideChar(CP_UTF8, NULL, szU8, strlen(szU8), wszString, wcsLen); //最后加上'\0' wszString[wcsLen] = '\0'; char *m_char; int len = WideCharToMultiByte(CP_ACP, 0, wszString, wcslen(wszString), NULL, 0, NULL, NULL); m_char = new char[len + 1]; WideCharToMultiByte(CP_ACP, 0, wszString, wcslen(wszString), m_char, len, NULL, NULL); m_char[len] = '\0'; return m_char; }

Unicode 转  UTF8

char* UnicodeToU8(wchar_t* wszString) { // unicode to UTF8 //预转换，得到所需空间的大小，这次用的函数和上面名字相反 int u8Len = ::WideCharToMultiByte(CP_UTF8, NULL, wszString, wcslen(wszString), NULL, 0, NULL, NULL); //同上，分配空间要给'\0'留个空间 //UTF8虽然是Unicode的压缩形式，但也是多字节字符串，所以可以以char的形式保存 char* szU8 = new char[u8Len + 1]; //转换 //unicode版对应的strlen是wcslen ::WideCharToMultiByte(CP_UTF8, NULL, wszString, wcslen(wszString), szU8, u8Len, NULL, NULL); //最后加上'\0' szU8[u8Len] = '\0'; return szU8; }