Unicode環境下寬字元------->窄字元的轉換

定義：TCHAR m_szIp[MAX_IP_LEN];   我們要將TCHANR型別陣列（寬字元型）轉換為char*pBuffer型別（窄字元型）： 

方法一：

int nNum=WideCharToMultiByte(CP_ACP,0,m_szIp,-1,0,0,NULL,NULL);
	char* pBuffer=new char[nNum+1];
	WideCharToMultiByte(CP_ACP,0,m_szIp,-1,pBuffer,nNum,NULL,NULL);

 USES_CONVERSION;
	  char *pBuffer = T2A(m_szIp);
 

方法一：MultiByteToWideChar

方法二：A2T、A2W

下面是對方法一的兩個函式的封裝：

char *WideCharToAnsi(wchar_t *pWideChar)
{
	if (!pWideChar) return NULL;
	char *pszBuf = NULL;
	int needBytes = WideCharToMultiByte(CP_ACP, 0, pWideChar, -1, NULL, 0, NULL, NULL);
	if (needBytes > 0){
		pszBuf = new char[needBytes+1];
		ZeroMemory(pszBuf, (needBytes+1)*sizeof(char));
		WideCharToMultiByte(CP_ACP, 0, pWideChar, -1, pszBuf, needBytes, NULL, NULL);
	}

	return pszBuf;
}


wchar_t *AnsiCharToWide(char *pChar)
{
	if (!pChar) return NULL;
	wchar_t *pszBuf = NULL;
	int needWChar = MultiByteToWideChar(CP_ACP, 0, pChar, -1, NULL, 0);
	if (needWChar > 0){
		pszBuf = new wchar_t[needWChar+1];
		ZeroMemory(pszBuf, (needWChar+1)*sizeof(wchar_t));
		MultiByteToWideChar(CP_ACP, 0, pChar, -1, pszBuf, needWChar);
	}

	return pszBuf;
}