C++ String 操作集合

 stirng 字符串拼接：

std::stringstream streamTmp;
streamTmp << "test test test test ....";
//allMutedUserNodeId 为 std::vector<unsigned long>
std::vector<unsigned long>::iterator iter = allMutedUserNodeId.begin();
while(iter != allMutedUserNodeId.end())
{
	unsigned long dwMutedNodeId = *iter;
	streamTmp << dwMutedNodeId;
	streamTmp << ",";
			
	iter++;
}
//转换成string
string jsonResultTmp = streamTmp.str();

字符串追加：

string jsonResult (jsonResultTmp, 0, (jsonResultTmp.length() - 1));//不需要释放
		
jsonResult.append("end end end");

const char* 转 char*

1. 强转

(char*)jsonResult.c_str()

2. 字符拷贝

char *cstr = new char[jsonResult.length() + 1];
strcpy(cstr, jsonResult.c_str());
//TBD do something.... 
delete[] cstr;//要删除