char str [1]和char * str在这种情况下的区别？(Difference between char str[1] and char *str in this context?)

char str [1]和char * str在这种情况下的区别？(Difference between char str[1] and char *str in this context?)

在研究一些代码时，我遇到了以下结构：

/* PACKET format: * * clientRandom - 20 byte buffer * yLen - 4 bytes (LoHi integer) * yData - yLen byte buffer * * Total length = 24 + yLen bytes */ typedef struct packetFormat { char clientRandom[20]; uint32 yLen; char yData[1]; }packetFormat;

为什么第三个字段没有声明为char *yData因为它是一个可变长度的char缓冲区？

While studying some code I encountered the following struct:

/* PACKET format: * * clientRandom - 20 byte buffer * yLen - 4 bytes (LoHi integer) * yData - yLen byte buffer * * Total length = 24 + yLen bytes */ typedef struct packetFormat { char clientRandom[20]; uint32 yLen; char yData[1]; }packetFormat;

Why the third field not declared as char *yData since its a char buffer of variable length?

最满意答案

它似乎是一个叫做struct hack的东西。

It seems to be a thing called struct hack.