ASP.NET PDF Viewer using C#, VB/NET

paint the court as though it were a 1-meter-wide robot, just because we forgot to initialize it Looking at the distances traveled and the angles through which it has turned, the answer is clearly no!

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currentFilename = filename; docWidget->document()->setModified( false ); setWindowTitle( tr("%1[*] - %2" ).arg(filename).arg(tr("SDI")) ); } The opposite method of loadFile is saveFile(const QString &). (You can see its implementation in Listing 8-23.) Despite their different tasks, the two functions implementations look very similar. The concept is the same: attempt to open the file, send the document as plain text to a stream and update the currentFilename, reset the modified bit, and update the window title. When a file is actually saved, the saveFile function returns true; if the file is not saved, the function returns false. Listing 8-23. Source code for saving the document to a file bool SdiWindow::saveFile( const QString &filename ) { QFile file( filename ); if( !file.open( QIODevice::WriteOnly | QIODevice::Text ) ) { QMessageBox::warning( this, tr("SDI"), tr("Failed to save file.") ); return false; } QTextStream stream( &file ); stream << docWidget->toPlainText(); currentFilename = filename; docWidget->document()->setModified( false ); setWindowTitle( tr("%1[*] - %2" ).arg(filename).arg(tr("SDI")) ); return true; } The return value from the saveFile method is used in the implementation of the fileSaveAs method shown in Listing 8-24. The Save As slot looks very much like the Open slot. It uses the getSaveFileName method to ask the user for a new file name. If a file name is selected, the saveFile method is called to try to save the document. Notice that false is returned if the file dialog is canceled, and the return value from the saveFile method is returned when an attempt to save the document is made. The saveFile returns true only if the document actually has been written to the file. Listing 8-24. Source code for the Save As action bool SdiWindow::fileSaveAs() { QString filename = QFileDialog::getSaveFileName( this, tr("Save As"), currentFilename );

Constraints such as this are useful in lots of cases. We might want to ensure that some UI element not extend off the screen, or grow too big or small, for example. But equally, an online banking application that doesn t permit transactions less than $10 shouldn t just clamp the amount the user entered from $1 to $10 and carry on happily!

If you look at the CultureInfo class, you ll see numerous properties, some of which define the culture s rules for formatting particular kinds of information. For example, there are the DateTimeFormat and NumberFormat properties. These are instances of Date TimeFormatInfo and NumberFormatInfo, respectively, and expose a large number of properties with which you can control the formatting rules for the relevant types. These types also implement IFormatProvider, so you can use these types to provide your own custom formatting rules to the string formatting methods we looked at earlier. Example 10-48 formats a number in an unusual way.

double value = 1.8; NumberFormatInfo nfi = new NumberFormatInfo(); nfi.NumberDecimalSeparator = "^"; Console.WriteLine(value.ToString(nfi));

Here we use the NumberFormatInfo to change the decimal separator to the circumflex (hat) symbol. The resultant output is:

if( filenameisEmpty() ) return false; return saveFile( filename ); } The fileSave method tries to save the document to the same file as before the name kept in currentFilename If the current file name is empty, the file has not been given a file name yet In this case, the fileSaveAs method is called, showing the user a File dialog to pick a file name It is shown as source code in Listing 8-25 The fileSave method returns the return value from either saveFile or fileSaveAs, depending on which method is used to save the file Listing 8-25 Source code for the Save action bool SdiWindow::fileSave() { if( currentFilename.

1^8

You can use this to control all sorts of features of the formatting engine, such as the default precision, percentage and positive/negative symbols, and separators. Now that we know how to format strings of various kinds, we ll go back to looking at some of the features of the string itself. In particular, we ll look at how to slice and dice an existing string in various ways.

If you have other database-related error messages, check that the wiki s App_Data directory permits write access for the anonymous Internet account on the computer If you are running Windows XP, you will need to add the [server]\ASPNET account to the list of users allowed to write/modify the App_Data folder If you are running Windows Server 2003, you should add the [server]\NETWORK SERVICE account Usually, however, the security settings on this folder are correct by default..

Earlier, we saw how to enumerate the characters in a string; however, we often want to be able to retrieve a character at a particular offset into the string. String defines an indexer, so we can do just that. Example 10-49 uses the indexer to retrieve the character at a particular (zero-based) index in the string.