C++ String16/String8与const char*及char*与vector相互转换(五十一)

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1.代码示例 

1.String16转const char*
String16 name16 = String16("Hello World");
String8 name8 = String8(name16);
const char *buffer = name8.string();验证：
printf("buffer = %s\n",buffer);注意：
String16.string()其实是const char16_t类型
String8.string()是const char*类型
所以转换之前需要将String16转换成const char*类型

2.char*与vector相互转换
#include <iostream>
#include <vector>
#include <time.h>
#include <string.h>
#include <typeinfo>
using namespace std;int main(){char buffer[] = "123456789";//1.char*(char数组)转vectorvector<char> data(buffer, buffer + strlen(buffer));for(auto d : data)cout << d << "";cout << endl;//2.for循环遍历:vector转charfor(size_t i = 0; i < data.size();  i++){ //data.capacity()添加的容量printf("%c",data[i]);}printf("\n");//3.vector转char*//char *bf = &data.at(0);//安全，有越界检查//char *bf = &data[0];cout << "typeid(data.data()) = " << typeid(data.data()).name() <<endl;printf("data.data() = %s\n",data.data());
}

// vector::data
#include <iostream>
#include <vector>int main (){int size = 10;std::vector<int> myvector(size);int *p = myvector.data();for(int i = 0; i < size; i++)p[i] = i;printf("11  = %ld\n",myvector.size());std::cout << "myvector contains:";for(unsigned i=0; i < myvector.size(); i++)std::cout << ' ' << myvector[i];std::cout << '\n';return 0;
}

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