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

Figure 14-4. The HttpDialog as shown to the user If the URL is found to be invalid, the QLabel widgets used to show the different parts of the URL are set to show no text. Then a dialog is shown before the method is left. If a valid URL has been entered, the QLabel widgets are updated with the URL sections. When updating the labels, the port property gets special treatment. If the user hasn t specified a port, the port property is set to -1, which means that the user wants to use the default port for HTTP communications: port 80. Listing 14-12. Parsing the URL and splitting it into its individual parts void HttpDialog::getClicked() { QUrl url( ui.requestEdit->text(), QUrl::TolerantMode ); if( !url.isValid() ) { ui.hostLabel->clear(); ui.pathLabel->clear(); ui.portLabel->clear(); ui.userLabel->clear(); ui.passwordLabel->clear();

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if (sourceFileContent[i] != otherFileContent[i]) { sourceFileEntry.Value.RemoveAt(otherIndex); otherIndex -= 1; if (sourceFileEntry.Value.Count == 0) { sourceFilesWithNoMatches.Add(sourceFileEntry.Key);

} #if DEBUG // Remember where we got to long currentPosition = sourceFileEntry.Key.Content.Position; // Seek to 0 bytes from the beginning sourceFileEntry.Key.Content.Seek(0, SeekOrigin.Begin); // Read 100 bytes from for (int index = 0; index < 100; ++index) { var val = sourceFileEntry.Key.Content.ReadByte(); if (val < 0) { break; } if (index != 0) { Console.Write(", "); } Console.Write(val); } Console.WriteLine(); // Put it back where we found it sourceFileEntry.Key.Content.Seek(currentPosition, SeekOrigin.Begin); #endif break; }

We start by getting hold of the current position within the stream using the Position property. We do this so that the code doesn t lose its place in the stream. (Even though we ve detected a mismatch here, remember we re comparing lots of files here perhaps this same file matches one of the other candidates. So we re not necessarily finished with it yet.) The first parameter of the Seek method tells us how far we are going to seek from our origin we re passing 0 here because we want to go to the beginning of the file. The second tells us what that origin is going to be. SeekOrigin.Begin means the beginning of the file, SeekOrigin.End means the end of the file (and so the offset counts backward you don t need to say 100, just 100). There s also SeekOrigin.Current which allows you to move relative to the current position. You could use this to read 10 bytes ahead, for example (maybe to work out what you were looking at in context), and then seek back to where you were by calling Seek(-10, SeekOrigin.Current).

QMessageBox::warning( this, tr("Invalid URL"), tr("The URL '%1' is invalid.").arg( ui.requestEdit->text() ) ); return; } ui.hostLabel->setText( url.host() ); ui.pathLabel->setText( url.path() ); ui.portLabel->setText( QString::number(url.port()==-1 80 : url.port()) ); ui.userLabel->setText( url.userName() ); ui.passwordLabel->setText( url.password() ); ... The source code from Listing 14-12 is a part of the HttpDialog class shown in Listing 14-13. The dialog is used by the user to download files using HTTP The user enters a URL in the . text field at the top and clicks the Get button. The button is connected to the getClicked slot shown previously. When the URL has been validated, it is used to download the file to which it points. While the file is being downloaded, the signals emitted from the QHttp object are listed in the list widget at the bottom of the dialog. Each of the slots starting with http is used for listening to the different signals that the QHttp object emits while working. The user interface itself has been created in Designer and is included as the ui member variable. Finally, a QFile pointer and QHttp object are used when downloading data. Listing 14-13. The HttpDialog class declaration class HttpDialog : public QDialog { Q_OBJECT public: HttpDialog(); private slots: void getClicked(); void void void void void void void void httpStateChanged(int); httpDataSent(int,int); httpDataReceived(int,int); httpHeaderDone(const QHttpResponseHeader&); httpDataDone(const QHttpResponseHeader&); httpStarted(int); httpFinished(int,bool); httpDone(bool);

Not all streams support seeking. For example, some streams represent network connections, which you might use to download gigabytes of data. The .NET Framework doesn t remember every single byte just in case you ask it to seek later on, so if you attempt to rewind such a stream, Seek will throw a NotSupportedException. You can find out whether seeking is supported from a stream s CanSeek property.

The virtualEarthMap control contains all the code necessary to handle mouse interaction. If you hold the mouse button down on the map, you can then drag the map. This demonstrates an important principle of Ajax and Atlas, namely, that asynchronous updates can