CODEWITHSUNDEEP
cstruct
Phl3tch
Phl3tch

Reputation: 145

Passing a struct to a callback that takes a variable of type void*

I'm trying to pass a struct to a callback set with curl_easy_setopt. Here's the struct:

typedef struct gfcontext_t {
  int sockfd;
  char requested_path[1024];
  char path[1024];
} gfcontext_t;

struct gfcontext_t ctx;

I've got these two lines setting up the callback:

curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ctx);

and the callback itself looks like this:

size_t write_callback(void *buffer, size_t size, size_t nmemb, void *userp) {
  printf("userp: %s\n", userp.requested_path);
}

The machine says "request for member ‘requested_path’ in something not a structure or union." So I guess the struct (ctx) is not being passed correctly. Can anyone point me in the right direction?

Upvotes: 1

Views: 133

Answers (1)

abs
abs

Reputation: 394

userp is a pointer. You should type cast it to gfcontext_t *.

printf("userp: %s\n", ((gfcontext_t *)userp)->requested_path);

Upvotes: 2

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