private IEnumerable <string> QueryGoogle(string url)
{
string result = null;
for (int i = 0; i < QueryRetries && String.IsNullOrEmpty(result); i++)
{
try
{
result = WebUtils.DownloadText(url, false);
}
catch (WebException exception)
{
if (exception.Status != WebExceptionStatus.Timeout)
{
throw exception;
}
LoggerWriter.WriteStep(Tokens.Info, "Retry", url);
}
}
if (!String.IsNullOrEmpty(result) && result.Contains("dyn.setResults(["))
{
return(ParseGoogleResponse(result));
}
else
{
return(new List <string>());
}
}
public ImageResult Query(string query)
{
if (!cache.ContainsKey(query))
{
ImageResult result = new ImageResult();
string googleQuery = BuildGoogleQuery(query);
LoggerWriter.WriteStep(Tokens.Info, "Google query", googleQuery);
string[] imageUrls = QueryGoogle(googleQuery).ToArray();
for (int i = 0; i < Math.Min(imageUrls.Length, DownloadRetries); i++)
{
LoggerWriter.WriteStepIndent(Tokens.Info, "\"" + imageUrls[i] + "\"");
}
for (int i = 0
; i < Math.Min(imageUrls.Length, DownloadRetries) && !result.Succeeded
; i++)
{
string url = imageUrls[i];
LoggerWriter.WriteStep(Tokens.Info, "Download", url);
try
{
byte[] image = WebUtils.DownloadBinary(url);
if (!Object.ReferenceEquals(image, null) &&
image.Length >= MinImageSize &&
image.Length <= MaxImageSize)
{
result = new ImageResult(image, url);
}
}
catch (Exception ex)
{
Logger.WriteLine(Tokens.Exception, ex);
}
}
cache[query] = result;
}
if (cache.ContainsKey(query) && cache[query].Succeeded)
{
return(cache[query]);
}
else
{
return(null);
}
}