结构初始化警告

Question

我有这个结构:

struct ChangeIntItem
{
    char *unit;
    const char **parser;
    int *changevalue;
    uint16_t *change_eeprom_value;
    int maximum;
    int minimum;
};

我想用这个struct-Variable初始化其他变量:

struct ChangeIntItem ChangeIntItemTypeBoolean = { .unit = "", .minimum = 0, .maximum = 1, .parser = {"off", "on"}};

它工作正常,但我收到一些警告:

Severity    Code    Description Project File    Line
Warning     braces around scalar initializer    Handsteuerung   C:\Users\...    11

Severity    Code    Description Project File    Line
Warning     (near initialization for 'ChangeIntItemTypeBoolean.parser') Handsteuerung   C:\Users\...    11

Severity    Code    Description Project File    Line
Warning     initialization from incompatible pointer type   Handsteuerung   C:\Users\...    11

Severity    Code    Description Project File    Line
Warning     (near initialization for 'ChangeIntItemTypeBoolean.parser') Handsteuerung   C:\Users\...    11

Severity    Code    Description Project File    Line
Warning     excess elements in scalar initializer   Handsteuerung   C:\Users\...    11

Severity    Code    Description Project File    Line
Warning     (near initialization for 'ChangeIntItemTypeBoolean.parser') Handsteuerung   C:\Users\...    11

在另一个案例中,我写了一个函数,它将结构的变量设置为默认值,但我更喜欢这种方法,因为它更短.

由'.parser = {"off","on"}引起的所有错误,但我没有弄错...

Answer 1

您可以使用复合文字,因此将init更改为

struct ChangeIntItem ChangeIntItemTypeBoolean = { .unit = "", .minimum = 0, .maximum = 1, .parser = (const char *[]){"off", "on"}};

测试

#include <stdio.h>
#include <stdint.h>

struct ChangeIntItem
{
    char *unit;
    const char **parser;
    int *changevalue;
    uint16_t *change_eeprom_value;
    int maximum;
    int minimum;
};

int main()
{
    struct ChangeIntItem ChangeIntItemTypeBoolean = { .unit = "", .minimum = 0, .maximum = 1, .parser = (const char *[]){"off", "on"}};

    printf ("%s - %s\n", ChangeIntItemTypeBoolean.parser[0], ChangeIntItemTypeBoolean.parser[1]);
}

产量

off - on