如何获取一个hex字符串的字符数？

调试输出如下：用string.c_str()输出的。取length()长度为146，但我需要的可能是字符数？是658或658/2
请问应该怎么取？
我要的658是我把这个hex字符串保存到文本文件，然后用editplus打开后统计字数得到的，我要的就是它！
统一码字数：658
ansi字节数：658
.。。。。。。。
这个到底是什么？怎么取？

    string aaa = Release("01010600", "123.456.789.188", "123.234.456.123");
    printb(aaa); 
    printb(aaa.length());
    输出：
0101060064210000000000003139322E3136382E33312E3138383139322E3136382E33312E3138383139322E3136382E33312E313139322E3136382E33312E31F0DEF1DFF5E900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000638253633501073D0701F0DEF1DFF5E932043139322E3136382E33312E31383836043139322E3136382E33312E313C084D53465420352E30FF
146

该回答引用ChatGPT

从你的输出来看，你得到的字符串是16进制格式的，每两个字符对应一个16进制数字，所以长度为146表示字符串包含了292个16进制数字（146 / 2 = 292）。

如果你想要得到字符数，那么需要将16进制转换成对应的字符，并计算字符数。具体可以使用C++的字符串流和iomanip库来实现。示例代码如下：

#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>

using namespace std;

int main()
{
    string hexStr = "0101060064210000000000003139322E3136382E33312E3138383139322E3136382E33312E3138383139322E3136382E33312E313139322E3136382E33312E31F0DEF1DFF5E900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000638253633501073D0701F0DEF1DFF5E932043139322E3136382E33312E31383836043139322E3136382E33312E313C084D53465420352E30FF";
    
    stringstream ss;
    for (size_t i = 0; i < hexStr.length(); i += 2) {
        string subStr = hexStr.substr(i, 2);
        int hexNum;
        sscanf(subStr.c_str(), "%x", &hexNum);
        ss << (char)hexNum;
    }
    string charStr = ss.str();

    cout << "Hex string: " << hexStr << endl;
    cout << "Character string: " << charStr << endl;
    cout << "Number of characters: " << charStr.length() << endl;

    return 0;
}