c++ - 将字符串 vector 转换为 *char

Question

void getParameters(char *query) {


    vector<string> temp;
    vector<string> elements;

    for (int i = 0; i < 10; i++)
    {
        if (query[i] == '\0') {

            temp.push_back('\0');

            // Here I want to convert temp values to string and append it to elements

            elements.push_back(temp);

            break;
        }

        if (query[i] == ' ')
        {
            temp.push_back('\0');
            elements.push_back(temp);

            temp.clear();

            continue;
        }

        temp.push_back(query[i]);

    }
}

我想将 temp vector 的所有值作为字符串附加到 elements vector 。

例如:

temp[0] = "t";
temp[1] = "e";
temp[2] = "s";
temp[3] = "t";
temp[4] = "\0";

结果:

elements[0] = "test";

我不知道查询的长度，所以这就是我为temp使用 vector 的原因。

查询的例子:

select id from user

最终结果应该是:

elements[0] = "select";
elements[1] = "id";
elements[2] = "from";
elements[3] = "user";

Answer 1

使用std::stringstream

std::vector<std::string> getParameters(const char *query) 
{

    std::vector<std::string> elements;
    std::stringstream ss(query);
    std::string q;
    while (ss >> q)
        elements.push_back(q);
return elements;
}

然后，

char *s="select id from user"; 
std::vector<std::string> elements= getParameters(s);

参见 HERE