1、首先纠正一个大多数人都有的一个误区:
std::string遇到'\0'并不会被截断!
2、举个例子论证1
#include <string>
#include <iostream>
int main(){
std::string temp = "abc\0def";
std::cout<<temp.length()<<std::endl;//没错,和你想的一样,输出是3.原因是:temp初始化是用了std::string(const char×)构造,而char×是会被字符‘\0’截断的!
std::string ss = "mmmmmmmm";//8个m
ss[0] = ‘a’;
ss[1] = ‘b’;
ss[2] = ‘c’;
ss[3] = ‘\0’;
ss[4] = ‘d’;
ss[5] = ‘e’;
ss[6] = ‘f’;
std::cout<<ss.length()<<std::endl;//输出为8
QMessage::information(this,"test window",QString("ss = %1").arg(QString::fromStdString(ss)));//输出为abcdefm
std::cout<<int(ss[3])<<std::endl;//输出为0,即字符‘\0’
}
3、所以所google的protobuf消息序列化中的string类型可以存储任意的字符序列,包括字符'\0'