Google not returning more than 64 results

问题

I am using the Google API for .Net http://code.google.com/p/google-api-for-dotnet/ and no matter how many results I ask for Google never returns more than 64.

Here is my code snippet:

GwebSearchClient client = new GwebSearchClient("xyz");
IList<IWebResult> results = client.Search(this.SearchText.Text, 100);

I expected to get 100 results, but never get more than 64 irrespective of the search term used.

Any ideas?

回答1:

According to the Google AJAX Search API (which uses the same HTTP requests to Google servers as the .NET API,) the maximum returned results are 64.

Note: The maximum number of results pages is based on the type of searcher. Local search supports 4 pages (or a maximum of 32 total results) and the other searchers (Blog, Book, Image, News, Patent, Video, and Web) support 8 pages (for a maximum total of 64 results).

From here, scroll two lines up. Or search the page for "maximum number".

回答2:

There is always the option of parsing html:
I needed approximately 200,000,000 (or at least 24M) results, and Since the API wasn't cutting it, I decided to download the html results and parse them manually using regular expressions. With HashTables, I was able to eliminate any duplicates.

My regular expression:
(parse only URLs with the given domain, and contain subdomains with 3-20 alphanumeric chars)

@"((?!www)([A-Za-z0-9-]{3,20})(\.example\.com))"

HTML URL Used:

[C# Source]
String.Format(  "http://www.google.com/search?q=site:{0}&num={1}"+
                "&hl=en&tbo=d&as_qdr=all&start={2}&sa=N&biw=1280&bih=709", 
                "example.com", count, start)

This has been tested in my own applications and yields rather nice results!

来源：https://stackoverflow.com/questions/3521121/google-not-returning-more-than-64-results

标签

google-api

google-api-dotnet-client