Casting a void pointer to a struct

Question

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?

Answer 1

(struct data*)pointer 

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

Answer 2

Typecasting void pointer to a struct can be done in following

void *vptr; typedef struct data {    /* members */ } tdata; 

for this we can typecast to struct lets say u want to send this vptr as structure variable to some function

then

void function (tdata *); main () {     /* here is your function which needs structure pointer         type casting void pointer to struct */          function((tdata *) vptr); } 

Note: we can typecast void pointer to any type, thats the main purpose of void pointers.