铸造一个空指针结构 [英] Casting a void pointer to a struct

问题描述

我开始感觉舒服℃，然后我跑进类型转换。如果我有以下的在* .h文件中定义的

 结构数据{
    int值;
    字符*标签;
};
 

这在其他的* .h文件

 ＃定义类型为void *
 

我怎么投的无效指针结构，这样我可以使用的传递到函数的变量TYPE VAL？例如，如果我想利用值TYPE VAL点，我怎么投它，这样我可以在价值传递给另一个功能是什么？

解决方案

 （结构数据*）指针
 

会施放一个指向无效的指针结构数据。

I started feeling comfortable with C and then I ran into type casting. If I have the following defined in an *.h file

struct data {
    int value;
    char *label;
};

and this in another *.h file

# define TYPE      void*

How do I cast the void pointer to the struct so that I can use a variable "TYPE val" that's passed into functions? For example, if I want to utilize the value that TYPE val points to, how do I cast it so that I can pass that value to another functions?

解决方案

(struct data*)pointer

will cast a pointer to void to a pointer to struct data.

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