Я написал функцию, в которой хочу передать указатель на массив структур. Я делаю new()
внутри него и хочу заполнить его данными, полученными из структуры PGresult (res). Однако я получил ошибки:
column number 0 is out of range 0..-1
column number 1 is out of range 0..-1
column number 2 is out of range 0..-1
column number 3 is out of range 0..-1
Segmentation fault (core dumped)
вот моя функция
Database::selectAnnouncements(const int user_id, const char *cat_id, struct announcementStruct **pStruct, int *size) {
*size = PQntuples(res);
struct announcementStruct * ann = new struct announcementStruct[PQntuples(res)];
*pStruct = ann;
int cr_fnum = PQfnumber(res, "created_on");
int con_fnum = PQfnumber(res, "content");
int cat_fnum = PQfnumber(res, "category");
int rm_fnum = PQfnumber(res, "remove_on");
for (int i = 0; i < PQntuples(res); i++) {
const char *cr_val = PQgetvalue(res, i, cr_fnum);
const char *con_val = PQgetvalue(res, i, con_fnum);
const char *cat_val = PQgetvalue(res, i, cat_fnum);
const char *rm_val = PQgetvalue(res, i, rm_fnum);
(*pStruct[i]).creation_date = new char[strlen(cr_val)];
(*pStruct[i]).content = new char[strlen(con_val)];
(*pStruct[i]).category = new char[strlen(cat_val)];
(*pStruct[i]).removal_date = new char[strlen(rm_val)];
strcpy((*pStruct[i]).creation_date, cr_val);
strcpy((*pStruct[i]).content, con_val);
strcpy((*pStruct[i]).category, cat_val);
strcpy((*pStruct[i]).removal_date, rm_val);
}
for (int i = 0; i < PQntuples(res); i++) {
printf("%s ", (pStruct[i]->creation_date));
printf(" %s ", (pStruct[i]->content));
printf(" %s ", (pStruct[i]->category));
printf(" %s ", (pStruct[i]->removal_date));
printf("\n");
}
PQclear(res);
}
вот как я это использую
struct announcementStruct *announcements = NULL;
int size;
db.selectAnnouncements(0, "DOGS", &announcements, &size);