尝试将值分配给 typedef 结构变量的成员时出现问题
我已经声明了这样的 typedef 结构：
typedef struct {
u8 member_a;
u32 member_d;
u32 member_c;
u16 member_d;
} __attribute__((packed)) fourmembers;
然后，我创建了一个名为“limp”的变量，其类型为“fourmembers”：
fourmembers limp;
接下来，我尝试为“fourmembers”变量的“member_a”成员分配一个值，例如结果
limp.member_a = 0x20;
是 GCC 给出了以下错误：
error: 'fourmembers' has no member named 'member_a'
任何人都可以告诉我我做错了什么吗？
I have declared a typedef structure like that:
typedef struct {
u8 member_a;
u32 member_d;
u32 member_c;
u16 member_d;
} __attribute__((packed)) fourmembers;
Then, I have created a variable named "limp" which is of type "fourmembers":
fourmembers limp;
Following, I've tried to assign a value to "member_a" member of the "fourmembers" variable like that:
limp.member_a = 0x20;
the result is that GCC gave the following error:
error: 'fourmembers' has no member named 'member_a'
Could anyone please advise me on what am I doing wrong?
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您有两个名为
member_d的成员变量。这可能对事情没有帮助。一旦我改变了它，我就可以获得一个简短的代码片段来毫无问题地进行编译。因此，如果这不能解决您的问题，您需要发布一个小型的完整示例来演示该问题。
You have two member variables called
member_d. That's probably not helping matters.Once I alter that, I can get a short code snippet to compile without problems. So if this doesn't fix your problem, you'll need to post a small, complete example that demonstrates the issue.
您做错的不是查看第一个编译器错误 - 该错误告诉您为什么编译器无法创建
fourmembers结构。此错误是u8不存在。What you're doing wrong is not looking at the first compiler error - the one that tells you why the compiler couldn't create the
fourmembersstruct. This error would be thatu8doesn't exist.嗯，既然您询问了有关您做错了什么的建议：
uint8_tuint16_t等。这实际上是编译错误的来源。__attribute__((packed))。忘记你曾经了解过它。总是错的。Hmm, since you asked for advice on what you're doing wrong:
uint8_tuint16_tetc. This is actually the source of your compile error.__attribute__((packed)). Forget you ever learned about it. It's always wrong.