Win32GetRequest.cpp

int MakeGetRequest(const TCHAR* server, const TCHAR* url, string& out)
{
  auto inet = InternetOpen(_T("AdRotate"), INTERNET_OPEN_TYPE_PRECONFIG, NULL, 0, 0);
  if(inet == NULL)
    return 1;

  auto session = InternetConnect(inet, server, 80, NULL, NULL, INTERNET_SERVICE_HTTP, 0, NULL);
  if(session == NULL)
    return 2;

  PCTSTR acceptedTypes[] = {_T("*"), NULL};
  auto request = HttpOpenRequest(session, _T("GET"), url, _T("HTTP/1.0"), NULL, acceptedTypes, 0, NULL);
  if(request == NULL)
    return 3;

  if(HttpSendRequestEx(request, NULL, 0, NULL, 0) != TRUE)
    return 4;

  if(HttpEndRequest(request, NULL, 0, 0) != TRUE)
    return 5;
  
  DWORD content_length;
  if(InternetQueryDataAvailable(request, &content_length, 0, 0) != TRUE)
    return 6;

  string data;
  data.resize(content_length);

  DWORD bytes_read;
  if(InternetReadFile(request, &data[0], content_length, &bytes_read) != TRUE)
    return 7;

  out.swap(data);

  return 0;
}