fix CurlTest error code 23 on Windows

tests/cpp-tests/Classes/CurlTest/CurlTest.cpp

@@ -21,6 +21,31 @@ CurlTest::CurlTest()
     _label->retain();
 }
 
+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 = (char*)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;
+}
+ 
 
 // the test code is
 // http://curl.haxx.se/mail/lib-2009-12/0071.html
@@ -30,10 +55,15 @@ void CurlTest::onTouchesEnded(const std::vector<Touch*>& touches, Event  *event)
     CURLcode res;
     char buffer[10];
 
+
     curl = curl_easy_init();
     if (curl) 
     {
-        curl_easy_setopt(curl, CURLOPT_URL, "http://webtest.cocos2d-x.org/curltest");
+        curl_easy_setopt(curl, CURLOPT_URL, "http://www.baidu.com");
+		//code from http://curl.haxx.se/libcurl/c/getinmemory.html
+		//If we don't provide a write function for curl, it will recieve error code 23 on windows.
+		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
+
         res = curl_easy_perform(curl);
         /* always cleanup */
         curl_easy_cleanup(curl);