c++ - 如何初始化可变长度的无符号字符数组？

Question

我通读了这个(How to initialize a unsigned char array?)，但它并没有完全回答我的问题。

我知道我可以像这样创建一个字符串数组:

const char *str[] =
{
  "first",
  "second",
  "third",
  "fourth"
};

如果我想 write() 这些我可以使用:write(fd, str[3], sizeof(str[3]));

但是如果我需要一个可变长度的无符号字符数组怎么办？我试过这个:

const unsigned char *cmd[] =
{
  {0xfe, 0x58},
  {0xfe, 0x51},
  {0xfe, 0x7c, 0x01, 0x02, 0x00, 0x23},
  {0xfe, 0x3d, 0x02, 0x0f}
};

然后我收到 gcc 编译警告，例如 *“围绕标量初始值设定项” *“初始化从整数生成指针而不进行强制转换”

Answer 1

这是一种方式

const unsigned char cmd1[] = {0xfe, 0x58};
const unsigned char cmd2[] = {0xfe, 0x51};
const unsigned char cmd3[] = {0xfe, 0x7c, 0x01, 0x02, 0x00, 0x23};
const unsigned char cmd4[] = {0xfe, 0x3d, 0x02, 0x0f};

const unsigned char *cmd[] =
{
  cmd1,
  cmd2,
  cmd3,
  cmd4
};