我正在为Arduino做一个将整数转换为十六进制字符*的函数,但是我遇到了将String转换为char *无法实现的问题。也许有一种动态分配char *内存的方法,我就不需要使用String类了。
char *ToCharHEX(int x)
{
String s;
int y = 0;
int z = 1;
do
{
if (x > 16)
{
y = (x - (x % 16)) / 16;
z = (x - (x % 16));
x = x - (x - (x % 16));
}
else
{
y = x;
}
switch (y)
{
case 0:
s += "0";
continue;
case 1:
s += "1";
continue;
case 2:
s += "2";
continue;
case 3:
s += "3";
continue;
case 4:
s += "4";
continue;
case 5:
s += "5";
continue;
case 6:
s += "6";
continue;
case 7:
s += "7";
continue;
case 8:
s += "8";
continue;
case 9:
s += "9";
continue;
case 10:
s += "A";
continue;
case 11:
s += "B";
continue;
case 12:
s += "C";
continue;
case 13:
s += "D";
continue;
case 14:
s += "E";
continue;
case 15:
s += "F";
continue;
}
}while (x > 16 || y * 16 == z);
char *c;
s.toCharArray(c, s.length());
Serial.print(c);
return c;
}
toCharArray() 函数并未将字符串转换为字符数组。Serial.print(c) 返回空白打印。我不知道该怎么办。