c++ - 在 C++ 中，如何访问多维数组中的值？

Question

感谢您的关注!

背景

我正在构建一个四轴飞行器，在其每个臂上都放置了一条 RGB 可寻址 LED。我用的是Arduino来驱动灯，Arduino的代码是C++，我不太了解的语言。

Here is the first StackOverflow question我发布了有关此代码的先前问题的信息。它为您提供了有关我到底想做什么的更多背景信息(如果您有兴趣的话)。

问题

由于对 first question 的回答，我现在已经正确地编写了数组“gpsHoldArr” ，但我无法访问它的值。

在下面的代码中，我调用了 toggleLights(gpsHoldArr[x][y]) 并传入了 gpsHoldArr 的子数组。子数组应该是指向给定 LED 灯条 ([x]) 然后指向给定步骤 ([y]) 的结果。

toggleLights 然后应该迭代传递给它的数组，并将它打开的每个 LED 的值(1-6 中的某个数字)以及该 LED 的红色、绿色和蓝色值发送到控制台.

不幸的是，当我运行下面的代码时，出现了这个错误:无法将参数 1 的 int(*)[3] 转换为 int* 到 'void toggleLights(int*)'

如有任何帮助，我们将不胜感激。

这是当前代码:

//4 arms, 6 steps, 6 leds
int gpsHoldArr[4][6][6][3] = {
  {
    {{255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}}
},
  {
    {{255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}}
},
  {
    {{255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}}
},
  {
    {{255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {0,0,0}},
    {{255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}, {255,0,0}}
}
};

toggleLights(gpsHoldArr[0][0]); //Toggles lights on strip #1, step #1
toggleLights(gpsHoldArr[1][0]); //Toggles lights on strip #2, step #1
toggleLights(gpsHoldArr[2][0]); //Toggles lights on strip #3, step #1
toggleLights(gpsHoldArr[3][0]); //Toggles lights on strip #4, step #1 

void toggleLights(int lights[]){
  for(int i = 0; i <= 6; ++i)
  {
    set_color_led(i, lights[i], lights[i], lights[i]);
  } 
}

void set_color_led(int led, int r, int g, int b){
   Serial.println(led); //Which LED (or "pixel") is it?
   Serial.println(r); //What is the red value?
   Serial.println(g); //What is the green value?
   Serial.println(b); //What is the blue value? 
}

Answer 1

我可能会这样做，一路上删除一些重复。
(宏技巧只是因为 Arduino - 在桌面上我会使用类而不是数组。)

struct LED { int r, g, b; };

#define BLACK  {0, 0, 0}
#define RED    {255, 0, 0}

#define DEFAULT_LEDS \
  { {RED, BLACK, BLACK, BLACK, BLACK, BLACK},\
    {RED, RED,   BLACK, BLACK, BLACK, BLACK},\
    {RED, RED,   RED,   BLACK, BLACK, BLACK},\
    {RED, RED,   RED,   RED,   BLACK, BLACK},\
    {RED, RED,   RED,   RED,   RED,   BLACK},\
    {RED, RED,   RED,   RED,   RED,   RED}}

LED gpsHoldArr[4][6][6] = {
   DEFAULT_LEDS,
   DEFAULT_LEDS,
   DEFAULT_LEDS,
   DEFAULT_LEDS
};


void set_color_led(int index, const LED& led){
   Serial.println(index); //Which LED (or "pixel") is it?
   Serial.println(led.r); //What is the red value?
   Serial.println(led.g); //What is the green value?
   Serial.println(led.b); //What is the blue value? 
}

void toggleLights(LED (&leds)[6]){
  for(int i = 0; i < 6; ++i)  // You had a '<=' bug here.
  {
    set_color_led(i, leds[i]);
  } 
}

toggleLights(gpsHoldArr[0][0]); //Toggles lights on strip #1, step #1