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#light let myControls = [| (new Button() :> Control); (new TextBox() :> Control); (new Label() :> Control) |] let uc (c : #Control) = c :> Control let myConciseControls = [| uc (new Button()); uc (new TextBox()); uc (new Label()) |] This example shows two arrays of controls being defined. The first, myControls, explicitly upcasts every control; the second, myConciseControls, delegates this job to a function. Also, given that the bigger the array, the bigger the savings and that it is quite common for these arrays to get quite big when working with WinForms, this is a good technique to adopt.

We were on the top floor; we didn t really have a place to put a gas generator. The first thing we tried was putting it in the office next to the server room. We started the thing up and it sounded like the end of the world. It was the loudest thing I have ever heard in my life. You might think the problem with starting a gas generator inside your office would be the exhaust, but it never got to that point. It was so terrifyingly loud. We thought, Even to avoid our customers calling us up angrily because their stores are offline, we cannot endure this. After about 5 seconds, we just looked at one another and shook our heads and turned it off. Then we tried putting it out on the street in front of our building. The problem was, we were up on the third floor. We got every extension cord we could find in the place and stuck them together end to end, and they were just were long enough to get out the window and down to the street. But only just it was so close that the extension cord was actually tight. It was running through our office at chest height and you could kind of twang it and it would go boinnnnnggg. Then we started the gas generator up in the street and that was just about bearable, so we ran the servers on that for a couple hours until the power came back.

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Connecting to the host when the Connect button has been clicked void FtpDialog::connectClicked() { uiconnectButton->setEnabled( false ); ftpconnectToHost( "ftptrolltechcom" ); uistatusLabel->setText( tr("Connecting to host..") ); } When the connectToHost call is complete, the QFtp object emits a commandFinished(int,bool) signal The signal is connected to the ftpFinished slot of the class The relevant parts of the slot are shown in Listing 14-4 The slot is divided into two switch statements The first one handles failures (that is, cases when error is true); the second one handles commands that have been successfully completed It is possible to identify issued commands from the request argument given to the slot All calls to the QFtp object return a request identifier, and you can tell which command has finished by matching it to the request argument In the slot shown in the listing there is a different approach.

Livingston: Can you remember any other hair-raising moments Graham: At one point, in the Spring of 96, when we only had about 20 users,

Because you issue only one command of each type at a time, you can rely on the currentCommand method, which returns an enumerated value, indicating which command the slot refers to In the case of the Connect button being clicked, the command finishing is a ConnectToHost command If the call fails, you inform the user by using a message box and then re-enable to the Connect button so the user can try again If the command completes successfully, you can continue the connection process by calling the login method It simply issues a new command, resulting in a new call to the slot Because the process involves several asynchronous commands, the flow can be somewhat complex to comprehend You can view it as a flow chart in Figure 14-2..

we all went off to this trade show down in New York the first trade show we ever went to. We came back and it turned out the server had crashed soon after we d left and had been down for 11 hours. And nobody noticed! We kept waiting for the angry phone calls, and they never came. It was so early in the history of the Web that nobody was ordering from these stores anyway, and they weren t even checking themselves to see if their sites were up. Half of these people who had online stores with us probably didn t even have Internet access.

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