I'm making a simple http request using CURL using getinmemory.c from CURL example page. There is no issue happen when requesting a single post json data. But, when requesting a large json data, the JSON result has truncated or receviced partially. Here is my code :
struct MemoryStruct { char *memory; size_t size; }; static size_t WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp) { size_t realsize = size * nmemb; struct MemoryStruct *mem = (struct MemoryStruct *) userp; mem->memory = realloc(mem->memory, mem->size + realsize + 1); if (mem->memory == NULL) { /* out of memory! */ printf("not enough memory (realloc returned NULL)\n"); return 0; } memcpy(&(mem->memory[mem->size]), contents, realsize); mem->size += realsize; mem->memory[mem->size] = 0; return realsize; } static void ExecuteCurl() { CURL *curl_handle; CURLcode res; struct MemoryStruct chunk; chunk.memory = malloc(sizeof(char*)); /* will be grown as needed by the realloc above */ chunk.size = 0; /* no data at this point */ curl_global_init(CURL_GLOBAL_ALL); /* init the curl session */ curl_handle = curl_easy_init(); if (curl_handle) { /* specify URL to get */ curl_easy_setopt(curl_handle, CURLOPT_URL, "https://jsonplaceholder.typicode.com/posts"); //curl_easy_setopt(curl_handle, CURLOPT_URL, "https://jsonplaceholder.typicode.com/posts/1"); /* send all data to this function */ curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback); /* we pass our 'chunk' struct to the callback function */ curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void * )&chunk); /* some servers don't like requests that are made without a user-agent field, so we provide one */ curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0"); /* get it! */ res = curl_easy_perform(curl_handle); /* check for errors */ if (res != CURLE_OK) { dlog_print(DLOG_ERROR, "CURL", "curl_easy_perform() failed: %s\n", curl_easy_strerror(res)); } else { /* * Now, our chunk.memory points to a memory block that is chunk.size * bytes big and contains the remote file. * * Do something nice with it! */ dlog_print(DLOG_DEBUG, "CURL", "Bytes received: %d\n", strlen(chunk.memory)); dlog_print(DLOG_DEBUG, "CURL", "JSON: %s\n", chunk.memory); } /* cleanup curl stuff */ curl_easy_cleanup(curl_handle); free(chunk.memory); } /* we're done with libcurl, so clean it up */ curl_global_cleanup(); }
FYI: I'm creating this project using Online Sample Project - Basic UI with EDC, then by adding code above I'm executing ExecuteUrl() method within app_create(void *data).
Is there any other way to handle large json response data? Thanks.
Regards.