在某些时候不希望用户输入emoji表情,所以需要将其过滤掉,屏蔽字符串中emoji表情方法如下：

std::string cutEmoji(const std::string str)
	{
		if (!str.compare(""))
		{
			return "";
		}
		unsigned unicode;
		std::string ret;
		for (int i = 0; i < str.size(); i++)
		{
			char codePoint = str[i];
			if (codePoint & 0x80)
			{
				switch ((unsigned)(codePoint & 0xf0))
				{
				case 0xf0:
					//0x9f -> emoji
					if ((unsigned)(str[i + 1] & 0x9f) != 0x9f)
					{
						for (int j = 0; j < 4; ++j)
						{
							ret.push_back(str[i + j]);
							char a = str[i + j];
						}
						i += 3;
					}
					break;
				case 0xe0:
					for (int j = 0; j < 3; ++j)
					{
						ret.push_back(str[i + j]);
					}
					i += 2;
					break;
				case 0xc0:
					for (int j = 0; j < 2; ++j)
					{
						ret.push_back(str[i + j]);
					}
					i += 1;
					break;
				default:
					CCAssert(0,"");
					break;
				}
			}
		}
		return ret;
	}

这样，在iOS和Android中都能实现过滤字符串中的emoji表情了

http://blog.csdn.net/lls1221/article/details/51453000