在C中的struct內部初始化數組

Question

我想初始化一個結構變量數組，而結構本身由字節數組組成

struct my_bytes {
    u8 byte[128];
};

struct my_bytes data[] = {
    { 0x12, 0x34, 0x56, 0x78 },
    { 0x13, 0x35, 0x57, 0x79 },
    { 0x14, 0x36, 0x58, 0x7a },
};

編譯在本機gcc 4.8.5中可以，但是在其他編譯器/環境中則出錯。還有另一種初始化數據的方法嗎？

錯誤信息

it_sram.c:200:3: error: missing braces around initializer [-Werror=missing-braces]
it_sram.c:200:3: error: (near initialization for 'data[0].byte') [-Werror=missing-braces]
it_sram.c:199:18: error: unused variable 'data' [-Werror=unused-variable]
it_sram.c: At top level:
cc1: error: unrecognized command line option "-Wno-misleading-indentation" [-Werror]
cc1: all warnings being treated as errors

Answer 1

您錯過了{}級

struct my_bytes data[] = {
  {{ 0x12, 0x34, 0x56, 0x78 } },
  {{ 0x13, 0x35, 0x57, 0x79 } },
  {{ 0x14, 0x36, 0x58, 0x7a } },
};

如果我將結構更改為：

struct my_bytes {
  u8 byte[128];
  int a;
};

您需要這樣的東西：

struct my_bytes data[] = {
  {{ 0x12, 0x34, 0x56, 0x78 }, 1 },
  {{ 0x13, 0x35, 0x57, 0x79 }, 2 },
  {{ 0x14, 0x36, 0x58, 0x7a }, 3 },
};

Answer 2

您需要兩對斜括號{} ：

struct my_bytes data[] = {
    { { 0x12, 0x34, 0x56, 0x78 } },
    { { 0x13, 0x35, 0x57, 0x79 } },
    { { 0x14, 0x36, 0x58, 0x7a } },
};

外部用於結構，內部用於數組。