转换vector< unsigned char> {1,2,3}转换为字符串“ 1-2-3”作为数字 [英] Convert vector<unsigned char> {1,2,3} into string "1-2-3" AS DIGITS

问题描述

我想在屏幕上的 std :: vector< unsigned char> 中显示数字，但是在到达接收者的途中，我需要将这些数字塞入 std :: string 。

I want to display numbers in a std::vector<unsigned char> on a screen, but on its way to the recipient, I need to stuff these numbers into a std::string.

无论我尝试了什么（ atoi ， reinterpret_cast ， string.c_str（） ...），给了我一个废话或一封信

Whatever I tried (atoi, reinterpret_cast, string.c_str() ...), gave me either a nonsense, or a letter representation of those original numbers - i.e. their corresponding ascii characters.

所以我如何轻松地（最好是标准方法）转换 vector< unsigned char> {1,2,3} 转换为字符串 1-2-3 ？

So how do I easily (preferably standard method) convert vector<unsigned char> {1,2,3} into a string "1-2-3"?

我在原始帖子（后来编辑）中提到，我可以用C＃或Java做到这一点。
根据πάνταῥεῖ的要求提供C＃或Java示例，这是一种快速的Linq C＃方式：

In the Original Post (later edited) I mentioned, that I could do that in C# or Java. Upon the request of πάντα ῥεῖ to provide example in C# or Java, here is a quick Linq C# way:

    public static string GetStringFromListNumData<T>(List<T> lNumData)
    {
        // if (typeof(T) != typeof(IConvertible)) throw new ArgumentException("Expecting only types that implement IConvertible !");
        string myString = "";
        lNumData.ForEach(x => myString += x + "-");
        return myString.TrimEnd('-');
    }

推荐答案

只需使用 std :: ostringstream ：

std::vector<unsigned char> v{1,2,3};
std::ostringstream oss;
bool first = true;
for(auto x : v) {
    if(!first) oss << '-'; 
    else first = false;
    oss << (unsigned int)x;
}
std::cout << oss.str() << std::endl;

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