C++编程小技巧

stringstream进行数据类型转换

https://www.jianshu.com/p/d205a47d1939

    // int -> string
    stringstream sstream;
    string strResult;
    int nValue = 1000;
 
    // 将int类型的值放入输入流中
    sstream << nValue;
    // 从sstream中抽取前面插入的int类型的值，赋给string类型
    sstream >> strResult;

int转换为char

std::string str = “hello”;
char c[1024] = {};
int pos = 0;
const unsigned  int kvlen = str.length();
sublength += (kvlen+4);
const unsigned int* pUint32K = &kvlen;
for (int i = 0; i < 4; i++){
c[pos+i] = ((char*)pUint32K)[i];
}

string转char*

https://blog.csdn.net/Vertira/article/details/107091250
将string转char*，可以使用string提供的c_str()或者data()函数。其中c_str()函数返回一个以’\0’结尾的字符数组，而data()仅返回字符串内容，而不含有结束符’\0’。

reinterpret_cast & static_cast

https://blog.csdn.net/weixin_60630451/article/details/126818390