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A lot of programmers whom you might interview these days are apt to consider recursion, pointers, and even data structures to be a silly implementation detail that has been abstracted away by today s many happy programming languages. When was the last time you had to write a sorting algorithm they snicker. Still, I don t really care. I want my ER doctor to understand anatomy, even if all she has to do is put the computerized defibrillator nodes on my chest and push the big red button, and I want programmers to know programming down to the CPU level, even if Ruby on Rails does read your mind and build a complete Web 2.0 social collaborative networking site for you with three clicks of the mouse. Even though the format of the interview is, superficially, just a candidate writing some code on the whiteboard, my real goal here is to have a conversation about it. Why did you do it that way What are the performance characteristics of your algorithm What did you forget Where s your bug That means I don t really mind giving programming problems that are too hard, as long as the candidate has some chance of starting out, and then I m happy to dole out little hints along the way, little toeholds, so to speak.

Note that because you are on a background thread, to prevent concurrent access, you take the same lock as described earlier before you attempt the write The consuming application explicitly stops the recording process by invoking the ScreenRecorderStop() method In stopping the recording process, you first stop the timer You then create a new instance of the MediaInfo type and set the FrameCount, FrameWidth, FrameHeight, and FrameRate properties accordingly You finally serialize the MediaInfo instance, convert it to a byte array, and write it out to the tail end of the file You also write the size of the byte array to the placeholder you.

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Now that you ve finished creating the GUI pages, it is time to handle the database part. The original Java Pet Store 2.0 sample program uses a Java persistent API (EJB3) to persist the model object. In ZK Pet Shop, I will use the Hibernate persistent layer to do the same thing. The good news is that the persistence mechanisms of EJB3 and Hibernate are almost the same, so the only thing you ll have to do is replace the EJB3 entity manager with Hibernate s thread session facility to handle database transactions. The first two sections of this chapter, Preparing the Database Environment and JDBC and Connection Pool, illustrate how to build the database environment manually. If you are familiar with these topics, you can skip to Making ZK Work with Hibernate.

saved at the beginning of the file At this point, the recording session is complete, and you have a file with a custom video format and metadata ready for you to consume Before you see how to consume this file, let s take a quick look at how the ScreenRecorder component is used from an application This sample borrows the code for Recipe 4-7 and extends it to use the ScreenRecorder Because most of the code is similar to that in Recipe 4-7, we only highlight the additions to support recording This code is found in a project named ScreenRecordingSource in the associated code sample The only change you make to the XAML for the application is to add a CheckBox named cbxRecord You handle the Checked and Unchecked events of cbxRecord in the codebehind to start and stop the recording, respectively.

After the CheckBox is checked and recording starts, you can interact with the UI any way you wish to generate the custom video file Make sure you spend at least a minute or so between the beginning and end of recording to generate content you can use to test the MediaStreamSource Listing 10-29 shows the Checked and Unchecked event handlers in the codebehind for the MainPage in the application Listing 10-29 Starting and Stopping Recording from an Application Using the ScreenRecorder Class cbxRecordChecked += new RoutedEventHandler((s, e) => { SaveFileDialog sfd = new SaveFileDialog(); bool Ret = sfdShowDialog(); if (Ret != null && RetValue == true) { RecorderTempFile = sfdOpenFile(); RecorderStart(); } }); cbxRecordUnchecked += new RoutedEventHandler((s, e) => { Recorder.

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