Есть код примера
парсера Jannson #include <stdlib.h>
#include <string.h>
#include <src/jansson.h>
#include <curl/include/curl/curl.h>
#define BUFFER_SIZE (256 * 1024) /* 256 KB */
#define URL_FORMAT "https://api.github.com/repos/vmg/redcarpet/commits"
#define URL_SIZE 256
/* Return the offset of the first newline in text or the length of
text if there's no newline */
static int newline_offset(const char *text)
{
const char *newline = strchr(text, '\n');
if(!newline)
return strlen(text);
else
return (int)(newline - text);
}
struct write_result
{
char *data;
int pos;
};
static size_t write_response(void *ptr, size_t size, size_t nmemb, void *stream)
{
struct write_result *result = (struct write_result *)stream;
if(result->pos + size * nmemb >= BUFFER_SIZE - 1)
{
fprintf(stderr, "error: too small buffer\n");
return 0;
}
memcpy(result->data + result->pos, ptr, size * nmemb);
result->pos += size * nmemb;
return size * nmemb;
}
static char *request(const char *url)
{
CURL *curl = NULL;
CURLcode status;
struct curl_slist *headers = NULL;
char *data = NULL;
long code;
curl_global_init(CURL_GLOBAL_ALL);
curl = curl_easy_init();
if(!curl)
goto error;
data = malloc(BUFFER_SIZE);
if(!data)
goto error;
struct write_result write_result = {
.data = data,
.pos = 0
};
curl_easy_setopt(curl, CURLOPT_URL, url);
/* GitHub commits API v3 requires a User-Agent header */
headers = curl_slist_append(headers, "User-Agent: Jansson-Tutorial");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_response);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &write_result);
status = curl_easy_perform(curl);
if(status != 0)
{
fprintf(stderr, "error: unable to request data from %s:\n", url);
fprintf(stderr, "%s\n", curl_easy_strerror(status));
goto error;
}
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
if(code != 200)
{
fprintf(stderr, "error: server responded with code %ld\n", code);
goto error;
}
curl_easy_cleanup(curl);
curl_slist_free_all(headers);
curl_global_cleanup();
/* zero-terminate the result */
data[write_result.pos] = '\0';
return data;
error:
if(data)
free(data);
if(curl)
curl_easy_cleanup(curl);
if(headers)
curl_slist_free_all(headers);
curl_global_cleanup();
return NULL;
}
int main(int argc, char *argv[])
{
size_t i;
char *text;
char url[URL_SIZE];
json_t *root;
json_error_t error;
if(argc != 3)
{
fprintf(stderr, "usage: %s USER REPOSITORY\n\n", argv[0]);
fprintf(stderr, "List commits at USER's REPOSITORY.\n\n");
// return 2;
}
snprintf(url, URL_SIZE, URL_FORMAT);
text = request(url);
if(!text)
return 1;
root = json_loads(text, 0, &error);
free(text);
if(!root)
{
fprintf(stderr, "error: on line %d: %s\n", error.line, error.text);
return 1;
}
if(!json_is_array(root))
{
fprintf(stderr, "error: root is not an array\n");
json_decref(root);
return 1;
}
for(i = 0; i < json_array_size(root); i++)
{
json_t *data, *sha, *commit, *message;
const char *message_text;
data = json_array_get(root, i);
if(!json_is_object(data))
{
fprintf(stderr, "error: commit data %d is not an object\n", (int)(i + 1));
json_decref(root);
return 1;
}
sha = json_object_get(data, "sha");
if(!json_is_string(sha))
{
fprintf(stderr, "error: commit %d: sha is not a string\n", (int)(i + 1));
return 1;
}
commit = json_object_get(data, "commit");
if(!json_is_object(commit))
{
fprintf(stderr, "error: commit %d: commit is not an object\n", (int)(i + 1));
json_decref(root);
return 1;
}
message = json_object_get(commit, "message");
if(!json_is_string(message))
{
fprintf(stderr, "error: commit %d: message is not a string\n", (int)(i + 1));
json_decref(root);
return 1;
}
message_text = json_string_value(message);
printf("%.8s %.*s\n",
json_string_value(sha),
newline_offset(message_text),
message_text);
}
json_decref(root);
return 0;
}
есть скомпилированная cURL вот таким образом:
./configure
make
make install
А .pro файл выглядит так
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
SOURCES += \
github_commits.c
HEADERS +=
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/src/.libs/release/ -ljansson
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/src/.libs/debug/ -ljansson
else:unix: LIBS += -L$$PWD/src/.libs/ -ljansson
INCLUDEPATH += $$PWD/src/.libs
DEPENDPATH += $$PWD/src/.libs
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/curl/lib/.libs/release/ -lcurl
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/curl/lib/.libs/debug/ -lcurl
else:unix: LIBS += -L$$PWD/curl/lib/.libs/ -lcurl
INCLUDEPATH += $$PWD/curl/lib/.libs
DEPENDPATH += $$PWD/curl/lib/.libs
Командная строка выдает:
usage: /home/username/programy/build-jansson-c-Desktop_Qt_5_2_1_GCC_64bit-Debug/jansson-c USER REPOSITORY
List commits at USER's REPOSITORY.
error: unable to request data from https://api.github.com/repos/vmg/redcarpet/commits:
Unsupported protocol
Простой
