How can I assign a struc to a void pointer passed through the paramters?

Question

In my code I have a struc

struct Test {

    int a;  

    int b;

    char c;

};

With my function:

int TestFunction(void* ptr){

    struct Test test;

    test.a = 0;

    test.b = 1;

    strcpy(c,"hello");



    return 0;

    }

Now to link the temp struc to the void ptr I passed in I have

struct Test* temp = (struct Test*)ptr;

struct Test test = *temp;

Is this the correct way to link strucs with void ptrs? Is there an easier way?

Answer 1

Since you want to be able to modify the struct pointed to, your sample code is not appropriate. What it does is create a local copy of the pointed-to struct and modifies the local copy instead of the original object.

What you want to do, rather, is this:

int TestFunction(void *ptr) {
    struct Test *test = ptr;
    test->a = 0;
    test->b = 1;

    return 0;
}

The a->b syntax is equivalent to (*a).b, meaning that it refers to whatever test points to.

How can I assign a struc to a void pointer passed through the paramters?

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