libcurl增加错误处理

app/src/main/cpp/netcamera/httpclient.cpp

@@ -65,6 +65,8 @@ int DoGetRequest(const char* url, int authType, const char* userName, const char
         curl_easy_setopt(curl, CURLOPT_SOCKOPTDATA, &netHandle);
     }
 
+    curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
+    curl_easy_setopt(curl, CURLOPT_USERAGENT , "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.94 Safari/537.36");
     //
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, OnWriteData);
     // 设置回调函数的参数,获取反馈信息