Figure 16-9: The first result URL and title in VS .NET

Print QR Code ISO/IEC18004 in VS .NET Figure 16-9: The first result URL and title

The result snippet that s returned is formatted in HTML, primarily meaning that it uses <b> </b> to mark words in the search term found in the result You can easily use the excellent string-handling capabilities provided by C# and NET to strip these HTML tags out of the result snippet if you d like In a Windows application, you can easily use the NET Regular Expression classes to strip out the HTML for display purposes or you can write code that does something with the information about which words in the search result were also in the search terms

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The calls to the Google Web methods using the methods in the class auto-generated by Visual Studio NET in this chapter are synchronous When you call a method synchronously, the program waits for the method to complete before it continues and executes subsequent code In contrast, an asynchronous method call does not block a program from continuing Instead, processing continues, and the asynchronous method sends a message when it is done Your program can then respond to that message in whatever way is appropriate Programming with asynchronous methods is a little more complicated than programming synchronously The reason for using asynchronous method calls is you don t want to hold everything up if you think the call to the method may take time Google makes a point of showing off its ability to respond to queries incredibly rapidly, so there s usually no real need to call the Google Web service APIs asynchronously (An exception might be if you expect your programs to call Google over a very slow connection) If you do need to call the Google APIs asynchronously, you should know that the class generated for the Google Web service contains asynchronous methods as well as the synchronous methods that I show you in this chapter For example, the synchronous method doGoogleSearch sends a query to Google The related asynchronous methods are BegindoGoogleSearch and EnddoGoogleSearch I ve posted a code example using asynchronous method calls to access the Google APIs on wwwbraintiquecom/research/

As part of the Google SDK, or software development kit, you can find a sample C# NET Google APIs Web service application This sample application, shown in Figure 16-10, shows The estimated number of return results for a search The size of a cached page Google s spelling suggestion based on the phrase entered See 14 and Appendix A for information about the SDK You can use the sample application as a model for your own Google API applications and to better understand how to program with the APIs

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I won t bother showing you the spelling suggestion code because it s pretty close to the application I show you earlier in this chapter But you may find having a look at the estimated number of returns for a search result, and the size of a cached page, worthwhile You can look at code in the sample project in the SDK after you download it, so to keep things simple I ve omitted some details here For both applications, start by creating a GoogleSearchService object:

GoogleGoogleSearchService s = new GoogleGoogleSearchService();

With the GoogleSearchService object, call doGoogleSearch, passing it a developer key and a search term:

GoogleGoogleSearchResult r = sdoGoogleSearch(keyBoxText, searchBoxText, 0, 1, false, , false, , , );

Here s how to use the GoogleSearchResult object to display the estimated result count:

int estResults = restimatedTotalResultsCount; searchResultLabelText = ConvertToString(estResults);

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