c - C 上的初始化结构问题

Question

我在编译过程中遇到此错误:

"c:\command_line.h(17): error C2143: syntax error : missing ';' before '*' Note: C++ does not support default-int command_line.h(17): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int"

这是我的代码:

命令行.h

typedef struct symbol
{
    char* sym_type;
    unsigned short address;
}symbol;


typedef struct symbol_map
{
    char** p_arr_keys;
    symbol* p_arr_values;
    int item_count;
    int array_mode;
    int copy_keys;
}symbol_map;

typedef struct params
{
    int data_counter;
    int code_counter;
    int line_counter;
    int command_len;
    int error_counter;
    int warning_counter;
    symbol_map* p_symbol_map; // (This is line 17- from the error msg)
    char* p_last_symbol
}params;

main.c

params config;
config.code_counter = 0;
config.data_counter = 0;
config.line_counter = 0;
config.command_len = 0;
config.command_first_char = EMPTY;
config.error_counter = 0;
config.warning_counter = 0;
config.p_last_symbol = NULL;
config.p_symbol_map = {NULL}; // (This is line 17- from the error msg)

知道这个初始化有什么问题吗？

 config.p_symbol_map = {NULL};

Answer 1

您使用的构造config.p_symbol_map = {NULL}是静态初始化，并且仅允许在变量声明中使用。如果您想将 NULL 分配给 p_symbol_map，您可以简单地 config.p_symbol_map = NULL。

应用于 symbol 结构的静态初始化的有效情况如下所示:

symbol sym = {
   NULL,
   0x42
};

更新:

顺便说一句，在结构定义中的 char* p_last_symbol 后面缺少一个分号。

typedef struct params
{
    int data_counter;
    int 
    int line_counter;
    int command_len;
    int error_counter;
    int warning_counter;
    symbol_map* p_symbol_map; // (This is line 17- from the error msg)
    char* p_last_symbol  <----- need to add ; here
}params;