字元格式互相轉換：Unicode ansi utf8

int Unicode2UTF8(const wchar_t* pUnicode, char* pUTF8Buffer, int nBufferSize)
{
	if( (nBufferSize == 0) && (pUTF8Buffer != NULL) )
		return 0;

	int result = WideCharToMultiByte(CP_UTF8, NULL, pUnicode, -1, pUTF8Buffer, nBufferSize, NULL, NULL);
	if ((result > 0) && (pUTF8Buffer != NULL))
		pUTF8Buffer[result-1] = 0;

	return result;
}

int UTF82Unicode(const char* pUTF8, wchar_t* pUnicodeBuffer, int nBufferSize)
{
	if( (nBufferSize == 0) && (pUnicodeBuffer != NULL) )
		return 0;

	int result = MultiByteToWideChar(CP_UTF8, NULL, pUTF8, -1, pUnicodeBuffer, nBufferSize);
	if ((result > 0) && (pUnicodeBuffer != NULL))
		pUnicodeBuffer[result-1] = 0;

	return result;
}

int Unicode2Ansi(const wchar_t* pUnicode, char* pAnsiBuffer, int nBufferSize)
{
	if( (nBufferSize == 0) && (pAnsiBuffer != NULL) )
		return 0;

	int result = ::WideCharToMultiByte(CP_ACP, 0, pUnicode, -1, pAnsiBuffer, nBufferSize, NULL, NULL);
	if ((result > 0) && (pAnsiBuffer != NULL))
		pAnsiBuffer[result-1] = 0;

	return result;
}

int Ansi2Unicode(const char* pAnsi, wchar_t* pUnicodeBuffer, int nBufferSize)
{
	if( (nBufferSize == 0) && (pUnicodeBuffer != NULL) )
		return 0;

	int result = ::MultiByteToWideChar(CP_ACP, 0, pAnsi, -1, pUnicodeBuffer, nBufferSize);
	if ((result > 0) && (pUnicodeBuffer != NULL))
		pUnicodeBuffer[result-1] = 0;

	return result;
}
           

簡單實用

CString strBuf;
int nSize = Unicode2UTF8(strBuf, NULL, 0);
char* szBuf = new char[nSize];
Unicode2UTF8(strBuf, szBuf, nSize);