Simple .NET/ASP.NET PDF document editor web control SDK

ui.disconnectButton->setEnabled( true ); ui.upButton->setEnabled( true ); selectionChanged(); break; } ui.statusLabel->setText( tr("Ready.") ); } else { switch( ftp.currentCommand() ) { ... case QFtp::Get: file->close(); delete file; file = 0; ui.disconnectButton->setEnabled( true ); ui.upButton->setEnabled( true ); selectionChanged(); ui.statusLabel->setText( tr("Ready.") ); break; } } }

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Then (once we ve set up a few variables) we call stream.Read and ask it for all of the data in the stream. It is entitled to give us any number of bytes it likes, up to the number we ask for. It returns the actual number of bytes read, or 0 if we ve hit the end of the stream and there s no more data.

A common programming error is to assume that the stream will give you as many bytes as you asked for. Under simple test conditions it usually will if there s enough data. However, streams can and sometimes do return you less in order to give you some data as soon as possible, even when you might think it should be able to give you everything. If you need to read a certain amount before proceeding, you need to write code to keep calling Read until you get what you require, as Example 11-40 does.

Notice that it returns us an int. So even if .NET did let us allocate arrays larger than 2 GB (which it doesn t) a stream can only tell us that it has read 2 GB worth of data at a time, and in fact, the third argument to Read, where we tell it how much we want, is also an int, so 2 GB is the most we can ask for. So while FileStream is able to work with larger files thanks to the 64-bit Length property, it will split the data into more modest chunks of 2 GB or less when we read. But then one of the main reasons for using streams in the first place is to avoid having to deal with all the content in one go, so in practice we tend to work with much smaller chunks in any case.

Mapping is a huge part of the new Windows Live Local web application, which you can use to look at what services are available at a particular location and have them all mapped out for you. Figure 10-1 shows an example of this; you can see that the context of this map is Seattle, Washington; the image is zoomed in to the famous Pike Place Market; and the search term is coffee. If you look at Figure 10-1, you ll see that two text boxes appear at the top of the page. You use the one on the right to set your current map context by searching for a location. So, for example, you could search for Pike Street, Seattle, WA. You use the text box on the left to search for the services you are interested in, such as coffee or soccer. The search results appear in the left pane, and their numbered icons appear on the map. These icons are called pushpins, and you ll see how to implement them in the Using Pushpins section, as well as how to use the same mapping libraries for your own applications. Atlas incorporates mapping functionality via the script library called AtlasUIMap. This .NET\ script library installs with Atlas; you can find it in the C:\Program Files\Microsoft ASP Atlas\v2.0.50727\Atlas\ScriptLibrary directory. Previous releases of Atlas prior to the Go Live license version issued in 2006 as the March Community Technology Preview (CTP) included the scripts in your Visual Studio 2005 solution, so you would be able to find them there. If you cannot see them in your solution file, you ll be able to find them in the aforementioned directory.

By combining the dialog shown in Figure 14-1 and the preceding listings with a simple main function showing the dialog, you have a complete FTP client. It is limited to one domain and can only navigate around the directories and perform downloading, but all the needed mechanisms are in place. To build the client, you must create a project file preferably by using qmake -project QT+=network. Then you can build your application as usual using qmake and make.

So we always call the Read method in a loop. The stream maintains the current read position for us, but we need to work out where to write it in the destination array (offsetIntoBuffer). We also need to work out how many more bytes we have to read (bytesToRead). We can now update the call to ReadAllBytes in our LoadFile method so that it uses our new implementation:

byte[] contents = ReadAllBytes(item.Filename);

If this was all you were going to do, you wouldn t actually implement ReadAllBytes yourself; you d use the one in the framework! This is just by way of an example. We re going to make more interesting use of streams shortly.

Build and run again, and you should see output with exactly the same form as before: