c - 在C中动态创建一个对象(使用radiohead库)

Question

我正在尝试使用 NRF24l01+ 在我的 arduino 上实现动态地址分配，但在我的设备收到分配的地址后，我无法获得全局初始化的 RHReliableDatagram

这就是我所拥有的(由于某种原因不起作用:

manager = new RHReliableDatagram(driver, ID);

错误:

sketch_oct02b.ino: In function 'void setup()':
sketch_oct02b:47: error: no match for 'operator=' in 'manager = (((RHReliableDatagram*)operator new(267u)), (<anonymous>->RHReliableDatagram::RHReliableDatagram(((RHGenericDriver&)(& driver.RH_NRF24::<anonymous>.RHNRFSPIDriver::<anonymous>)), ((uint8_t)ID)), <anonymous>))'
C:\Users\****\Documents\HAS\HAS-mc\libraries\RadioHead/RHReliableDatagram.h:66: note: candidates are: RHReliableDatagram& RHReliableDatagram::operator=(const RHReliableDatagram&)

这是有效的代码，但我无法在运行时更改地址。

RHReliableDatagram manager(driver, DHT1_ADDRESS);

这里是我的问题的最小再现:

#include <RHReliableDatagram.h>
#include <RH_NRF24.h>
#include <SPI.h>
#include <DHT.h>

RH_NRF24 driver(8,10);

int ID = 255; //init ID, will be reassigned by server
RHReliableDatagram manager(driver,ID);//255 is the ID before init


void setup() 
{
  ID = 15;
  manager = new RHReliableDatagram(driver, ID);//NOTE added this
  //spi.setPins(13, 4, 3); //miso mosi sck
  if (!manager.init()){
    Serial.println("NRF failed to initialise");
    digitalWrite(PIN_NRF_ERROR,HIGH);
  } else {
    Serial.println("NRF succesfully initialized");
  }
}

void loop()
{

}

radio 头库的文档在这里: http://www.airspayce.com/mikem/arduino/RadioHead/classRHReliableDatagram.html

Answer 1

需要将动态分配的对象赋值给该对象类型的指针，如

type *p_var = new type(initializer)

在您的代码中应将其删除

RHReliableDatagram manager(driver,ID);//255 is the ID before init

并改变

manager = new RHReliableDatagram(driver, ID);//NOTE added this

至

RHReliableDatagram *manager = new RHReliableDatagram(driver, ID);//NOTE added this

此外，您还需要记住在不再需要管理器时使用delete()来释放管理器的内存。