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Furthermore, default constructors can easily leave some fields uninitialized and therefore null and can leave some at risk of causing a NullReferenceException This is why a constructor in F# must initialize all fields defined by a class Fields are defined using the keyword val, followed the name of the field, and then the name of the type separated from the property name by a colon The next example shows a simple class, file1, that has two fields, path and innerFile, that are initialized in the constructor, which has one parameter, path: #light open SystemIO type File1 = class val path: string val innerFile: FileInfo new(path) = { path = path ; innerFile = new FileInfo(path) } end let myFile1 = new File1("whatevertxt") It s possible to overload constructors; one simply adds a second constructor with a different number of parameters.

time. It was kind of, Let s see what I can do. Because I fully believed in the thesis of these companies can be really cheap to run if you do it with even just a little bit of intelligence. I took money with ONElist because at that point we were growing so quickly that we were running out of money, and I couldn t fund it myself any longer. ONElist got to be the 150-person company. But you don t have to do that these days.

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Let s start by looking at the randomImage method (see Listing 14-21) The method uses a QDir object to look for files in the /images directory It assumes that all files in that directory are valid images It then uses the qrand function to generate a random number used to pick one of the files Before using qrand, it is important to initialize the random number generator with a seed; otherwise, you will get the same series of numbers each time The qsrand call uses the number of seconds passed since midnight as the seed Listing 14-21 Pick a random file from images and load it using QImage QImage ServerThread::randomImage() { qsrand(QTime(0,0,0)secsTo(QTime::currentTime())); QDir dir("images"); dirsetFilter( QDir::Files ); QFileInfoList entries = direntryInfoList(); if( entriessize() == 0 ) { qDebug( "No images to show!" ); return QImage(); } return QImage( entriesat( qrand() % entriessize() ).

initially. If you get users, then everything else follows. Basically any technology can be copied, any concept can be copied. In my opinion, what makes one of these companies valuable is the users. That can t be copied.

absoluteFilePath() ); } The task of actually sending the image is handled from the run method shown in Listing 14-22 The constructor, shown in the same listing, simply keeps the description for the run method In the run method, the descriptor is used to set up a QTcpSocket object By setting the socket descriptor using setSocketDescriptor, you get a socket object connected to the client connecting to the server When the socket has been set up, it s time to prepare the data for transmittal over the socket This is a two-stage process First you create a QBuffer for writing the image to A QBuffer is a QIODevice (just as a QFile is), and QImageWriter can write to any QIODevice The call to the write method of QImageWriter leaves you with a buffer containing the image encoded as a PNG.

If you want to overload with parameters of different types, then you must provide type annotations The following example shows a class, File2, with two constructors, one with no parameters and one with one parameter: #light open SystemIO type File2 = class val path: string val innerFile: FileInfo.

Fletcher: No, I m not nearly that smart. Just friends and news sites that I wanted to follow on a regular basis. But I was latching onto trends, of course, which are [that] the number of websites on the Internet is just growing exponentially over time. So if I had this problem now and I knew that I was a very early adopter, other people would probably have the problem eventually. It was just a question of when. I thought I was just way too early. But I wasn t. Who knew Livingston: Why did you think you were way too early Fletcher: Because I talked to all my friends and nobody knew what a blog was.

Nobody knows what a blog is and certainly nobody knows what aggregation is. Even these days, you say, Do you know what syndication is and they think, Seinfeld reruns. Which is one of the struggles we had with Bloglines trying to explain these concepts to normal people. Syndication, RSS, aggregation What are these goofy things But we didn t have to do the education as to what a blog is because the press was doing that for us.

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