Use iXMLHttpRequest2 to download zip file - visual-c++

Question

I am trying to port cocos2dx application for Windows phone 8. I am trying to use iXMLHTTPRequest class to perform Network calls in C++.
I am trying to download zip file using this but dont know what and where I am doing wrong. Here is my code which I am using, Please help me to figure out the issue and what I should do to make it working.
void HTTPRequest::sendRequest(){
m_cancelHttpRequestSource = cancellation_token_source();
// Set up the GET request parameters.
std::string s_str = std::string(urlString);
std::wstring wid_str = std::wstring(s_str.begin(), s_str.end());
const wchar_t* w_char = wid_str.c_str();
auto uri = ref new Uri( ref new String(w_char));
String ^temp = uri->AbsoluteUri;
auto token = m_cancelHttpRequestSource.get_token();
// Send the request and then update the UI.
onHttpRequestCompleted(m_httpRequest.GetAsync(uri, token));
}
void HTTPRequest::onHttpRequestCompleted(concurrency::task httpRequest)
{
httpRequest.then([this](task previousTask)
{
try
{
wstring response = previousTask.get();
if (m_httpRequest.GetStatusCode() == 200)
{
size_t strSize;
FILE* fileHandle;
auto local = Windows::Storage::ApplicationData::Current->LocalFolder;
auto localFileNamePlatformString = local->Path + "\\test1.zip";
// Create an the xml file in text and Unicode encoding mode.
if ((fileHandle = _wfopen(localFileNamePlatformString->Data(), L"wb")) == NULL) // C4996
// Note: _wfopen is deprecated; consider using _wfopen_s instead
{
wprintf(L"_wfopen failed!\n");
return(0);
}
// Write a string into the file.
strSize = wcslen(response.c_str());
if (fwrite(response.c_str(), sizeof(wchar_t), strSize, fileHandle) != strSize)
{
wprintf(L"fwrite failed!\n");
}
// Close the file.
if (fclose(fileHandle))
{
wprintf(L"fclose failed!\n");
}
}
else
{
// The request failed. Show the status code and reason.
wstringstream ss;
ss << L"The server returned "
<< m_httpRequest.GetStatusCode()
<< L" ("
<< m_httpRequest.GetReasonPhrase()
<< L')';
//String ^responseText = ref new String(ss.str().c_str());
m_delegate->parserError(requestType->getCString(), "Print Status Code later");
}
}
catch (const task_canceled&)
{
// Indicate that the operation was canceled.
//String ^responseText = "The operation was canceled";
m_delegate->parserError(requestType->getCString(), "Operation has canceled");
}
catch (Exception^ e)
{
// Indicate that the operation failed.
//String ^responseText = "The operation failed";
m_delegate->parserError(requestType->getCString(), "The operation failed");
// TODO: Handle the error further.
(void)e;
}
}, task_continuation_context::use_current());
}