libcurl API：无法完全接收服务器数据问题

来源：互联网发布：旺宝淘宝收藏软件编辑：程序博客网时间：2024/06/08 11:10

1、用下面的代码如果服务器返回数据较大的话无法全部接收：

#include <stdio.h>#include <curl/curl.h>#include <stdlib.h>#include<string.h>#include <sys/types.h>#include <json/json.h>#include<string>size_t saveData(void *ptr, size_t size, size_t nmemb, void *userdata){sprintf((char *)userdata,"%s",(char *)ptr);}int main(int argc, char *argv[]){CURL *curl;CURLcode res;//char data[]="{\"method\" : \"xbmc_get_dir\",\"para\" : \"?mode=1&name=%E7%94%B5%E8%A7%86%E5%89%A7&id=c_97&cat=%E4%B8%8D%E9%99%90&area=%E4%B8%8D%E9%99%90&year=%E4%B8%8D%E9%99%90&order=7\"}";//char data[]="{\"method\" : \"xbmc_get_dir\",\"para\" : \"\"}";json_object *p_json_obj = NULL;p_json_obj = json_tokener_parse(data);int len;curl = curl_easy_init();char rece[20480];if(curl!=NULL){curl_easy_setopt(curl, CURLOPT_POST, 1L);curl_easy_setopt(curl, CURLOPT_URL, "127.0.0.1/xbmc-server.php");curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, strlen(data));curl_easy_setopt(curl, CURLOPT_WRITEDATA, rece);curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, saveData);res = curl_easy_perform(curl);curl_easy_cleanup(curl);}printf("111%s\n",rece);json_object *p_json_obj1 = NULL;p_json_obj1 = json_tokener_parse(rece);json_object *p_obj = json_object_object_get(p_json_obj1, "dirlist");char * p_method;p_method = (char *)json_object_get_string(p_obj);printf("%s\n",p_method);return 0;}

2、改用如下可以：

#include <stdio.h>#include <curl/curl.h>#include <stdlib.h>#include<string.h>#include <sys/types.h>#include <json/json.h>#include<string>std::string  strrr;size_t saveData(void *ptr, size_t size, size_t nmemb, void *userdata){char httpsBuffer[10240];printf("22222222%s\n",userdata);printf("3333333%s\n\n\n\n",ptr);memset (httpsBuffer,0,sizeof(httpsBuffer));memcpy(httpsBuffer,ptr,nmemb);std::string tmp((char *)httpsBuffer);strrr+=tmp;return nmemb*size;}int main(int argc, char *argv[]){CURL *curl;CURLcode res;//char data[]="{\"method\" : \"xbmc_get_dir\",\"para\" : \"?mode=1&name=%E7%94%B5%E8%A7%86%E5%89%A7&id=c_97&cat=%E4%B8%8D%E9%99%90&area=%E4%B8%8D%E9%99%90&year=%E4%B8%8D%E9%99%90&order=7\"}";json_object *p_json_obj = NULL;p_json_obj = json_tokener_parse(data);int len;curl = curl_easy_init();char rece[20480];if(curl!=NULL){curl_easy_setopt(curl, CURLOPT_POST, 1L);curl_easy_setopt(curl, CURLOPT_URL, "127.0.0.1/xbmc-server.php");curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, strlen(data));curl_easy_setopt(curl, CURLOPT_WRITEDATA, rece);curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, saveData);res = curl_easy_perform(curl);curl_easy_cleanup(curl);}printf("000%s\n",strrr.c_str());json_object *p_json_obj1 = NULL;p_json_obj1 = json_tokener_parse(strrr.c_str());json_object *p_obj = json_object_object_get(p_json_obj1, "dirlist");char * p_method;p_method = (char *)json_object_get_string(p_obj);printf("%s\n",p_method);return 0;}