关于#windows上调用cups库#的问题，请各位专家解答！

为什么在Windows上编译cups库后执行以下代码my_get_dests(0, 0, &dests)一直都返回0，找不到打印机，请各路英雄指点迷津

```c
#include <stdio.h>
#include <cups/cups.h>

typedef struct {
    int num_dests;
    cups_dest_t *dests;
} my_user_data_t;

int my_dest_cb(my_user_data_t *user_data, unsigned flags, cups_dest_t *dest) {
    if (flags & CUPS_DEST_FLAGS_REMOVED) {
        user_data->num_dests = cupsRemoveDest(dest->name, dest->instance, user_data->num_dests, &(user_data->dests));
    }
    else {
        user_data->num_dests = cupsCopyDest(dest, user_data->num_dests, &(user_data->dests));
    }
    return 1;
}

int my_get_dests(cups_ptype_t type, cups_ptype_t mask, cups_dest_t **dests) {
    my_user_data_t user_data = { 0, NULL };

    if (!cupsEnumDests(CUPS_DEST_FLAGS_NONE, 1000, NULL, type, mask, (cups_dest_cb_t)my_dest_cb, &user_data)) {
        cupsFreeDests(user_data.num_dests, user_data.dests);
        *dests = NULL;
        return 0;
    }
    else {
        *dests = user_data.dests;
        return user_data.num_dests;
    }
}

int main(int argc, const char * argv[]) {
    cups_dest_t *dests = NULL;
    int num_dests = my_get_dests(0, 0, &dests);
    printf("Destination found: %d\n", num_dests);

    return 0;
}

```