.NET/Java PDF, Tiff, Barcode SDK Library

The QFtp class can be used for tasks other than building FTP client applications. Because the get method downloads to a QIODevice, you can use it to download data directly into a QBuffer device and show it (compare this to the way you stored images in a BLOB column in 13). It is also possible to upload data using the put method, which is the opposite of the get method. When uploading and downloading, it is important to control whether the FTP

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C:\Users\mwa\AppData\Local\1ssoimgj.wqg C:\Users\mwa\AppData\Local\cjiymq5b.bfo C:\Users\mwa\AppData\Local\diss5tgl.zae Warning: You do not have permission to access this directory. Access to the path 'C:\Users\mwa\AppData\Local\u1w0rj0o.2xe\' is denied. Matches ------C:\Users\mwa\AppData\Local\1ssoimgj.wqg\SameNameAndContent.txt C:\Users\mwa\AppData\Local\cjiymq5b.bfo\SameNameAndContent.txt C:\Users\mwa\AppData\Local\diss5tgl.zae\SameNameAndContent.txt -------

That s all very well, but we haven t actually improved anything. We wanted to avoid loading all of those files into memory. Instead of loading the files, let s update our FileContents class to hold a stream instead of a byte array, as Example 11-41 shows.

internal class FileContents { public string FilePath { get; set; } public FileStream Content { get; set; } }

connection communicates in binary mode or ASCII mode by using a third optional argument to the get(QString,QIODevice*,TransferType) and put(QIODevice*,QString,TransferType) methods. The transfer type can be either QFtp::Binary or QFtp::Ascii. If you are missing a method in the QFtp class, you can send any command understood by the FTP server using the raw command interface with the rawCommand method. If you expect a reply from a raw command, you can listen to the rawCommandReply(int,QString) signal.

To use Atlas maps on a page, you follow the typical procedure as when using client-side controls in Atlas. For more about this, see s 3, 4, and 5. Typically you create an HTML page and place controls and <div> tags on this page. You give these controls and tags IDs, which you use to map the Atlas control to an underlying element. So, to use an Atlas map on an area of your page, you would use some HTML like this: <div id="MyMap" style="height:400px;width:400px; "> </div> Atlas map controls are called virtualEarthMap, and you can assign one to this <div> element using the following Atlas Script: <virtualEarthMap id="MyMap" latitude="48" longitude="-122" mapStyle="Road" zoomLevel="9"> </virtualEarthMap>

We ll have to update the code that creates the FileContents too, in our LoadFiles method from Example 11-35. Example 11-42 shows the change required.

content.Add(new FileContents { FilePath = item.FilePath, Content = File.OpenRead(item.FilePath) });

(You can now delete our ReadAllBytes implementation, if you want.) Because we re opening all of those files, we need to make sure that we always close them all. We can t implement the using pattern, because we re handing off the references outside the scope of the function that creates them, so we ll have to find somewhere else to call Close.

The HTTP protocol works like the FTP protocol, but there are differences. The most obvious one is that when working with an FTP connection you connect, move around, and perform actions. When working with HTTP, you perform one request at a time, and the requests themselves are more or less independent. When it comes to similarities, both the QFtp and QHttp classes are asynchronous. They also solve similar problems they move data across a network.

DisplayMatches (Example 11-33) ultimately causes the streams to be created by calling LoadFiles, so DisplayMatches should close them too. We can add a try/finally block in that method s innermost foreach loop, as Example 11-43 shows.

foreach (var matchedBySize in matchesBySize) { List<FileContents> content = LoadFiles(matchedBySize); try { CompareFiles(content); } finally { foreach (var item in content) { item.Content.Close(); } } }

The last thing to update, then, is the CompareBytes method. The previous version, shown in Example 11-39, relied on loading all the files into memory upfront. The modified version in Example 11-44 uses streams.

private static void CompareBytes( List<FileContents> files, Dictionary<FileContents, List<FileContents>> potentiallyMatched) { // Remember, this only ever gets called with files of equal length. long bytesToRead = files[0].Content.Length; // We work through all the files at once, so allocate a buffer for each. Dictionary<FileContents, byte[]> fileBuffers = files.ToDictionary(x => x, x => new byte[1024]); var sourceFilesWithNoMatches = new List<FileContents>(); while (bytesToRead > 0) { // Read up to 1k from all the files. int bytesRead = 0; foreach (var bufferEntry in fileBuffers) { FileContents file = bufferEntry.Key; byte[] buffer = bufferEntry.Value;

Because the Web is driven by URLs, applications need to be able to properly parse these URLs into their appropriate components to put the necessary communicative commands to work. This is where QUrl enters the picture; it makes it easy to validate a URL and break it into the components that you need. Let s start by having a look at Figure 14-3, which shows a complex URL and the different parts that it comprises. The names for the parts in the figure correspond to properties of the QUrl class.