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birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
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birt code 39,
birt code 39,
birt code 39,
birt code 39,
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birt code 39,
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birt code 39,

GLib uses a standard type of naming for error elements. The error domain is always formatted <NAMESPACE>_<MODULE>_ERROR, where the namespace is the library containing the function and the module is the widget or object type. Appending the error type to the end of the domain s name creates the error code. Every error code enumeration also includes <NAMESPACE>_<MODULE>_ERROR_FAILED, a generic fail code called. This will be returned if a specific error is not available. If you are checking error codes, you should pick and choose the most likely to occur, because checking every error type is neither efficient nor sensible. You should only check the types of errors that you can recover from. In all other cases, the human-readable message is provided for more precise user feedback. There is one pitfall with the GError structure called piling up. If you use the same GError structure in two consecutive functions, the second error will replace the first. The original error will be forever lost. To prevent this problem, you should handle errors immediately after the first function call. Then use g_clear_error() to reset the GError structure values to their initial states. At that point, you can reuse the GError structure for the next function. if (error && * error) { g_error_free (*error); *error = NULL; }

protected void CurrentPageShouldBe(string pageId) { Browser.TextField(Find.ByName("pageId")).Value.ShouldEqual(pageId); }

You should note that g_clear_error() is simply a convenience function, which performs the functionality shown in the preceding code snippet. If the error is set, call g_error_free(), which frees first the message string and then the slice allocated by the GError object. It then points the error to NULL. A complete list of error domains in GTK+ and its supporting libraries, along with the corresponding error types, can be found in Appendix E.

RC4 heavily uses modular arithmetic to create a random key stream RC4 works by using an array, S, called a state table, whose values it continuously changes to generate the key stream The state table is seeded with a finite-sized key that fills the array initially Once initialized, the code for RC4 (shown following) is executed to generate each new byte of the infinite key i = (i + 1) mod 256 j = (j + S[i]) mod 256 swap (S[i], S[j]) t = (S[i]+S[j]) mod 256 K = S[t] The code uses three counters: i, j, and t The counter i iterates through all of the entries in the state table at least once, every 256 steps, for every 256 bytes of key that are generated The counter j adds its value to whatever value is contained at the ith position of the state table, and updates itself.

Finally, we need to assert that our application changed the price value correctly. This will require some additional work in our view, because it s currently quite difficult to locate a specific data-bound HTML element. The original test merely searched for the price text anywhere in the page. But this means that our test could pass even if the price wasn t updated, because the text for the price might show up for something unrelated, such as another product, the version text at the bottom of the screen, the shopping cart total, and so on. Instead, we need to use a similar tactic of displaying our information as we did for rendering our edit templates. We ll use the expression-based display templates, as shown in listing 20.18.

In the last chapter, you learned about GtkFileChooser and the GtkFileChooserButton widget. Recall that GtkFileChooser is not a widget, but an interface. Interfaces differ from classes, because you cannot derive from them, and they do not implement the functionality they declare. GTK+ provides the following three widgets that implement the GtkFileChooser interface: GtkFileChooserButton: The file chooser button was covered in the previous chapter. It allows the user to choose one file or folder by displaying a GtkFileChooser dialog when clicked. GtkFileChooserDialog: This widget is simply a dialog that uses a GtkFileChooserWidget as its child. Since it implements the GtkFileChooser interface, you do not ever have to directly access its child widget. GtkFileChooserWidget: This is the actual widget that allows the user to choose a file or folder. It can also facilitate the creation of a folder or saving of a file. When you use a GtkFileChooserDialog, you are actually using a file chooser widget packed into a GtkDialog. You have already learned about GtkFileChooserButton and have used a file chooser to open one file and to select a directory. There are three other abilities provided by the file chooser widget. In the next three examples, you will learn how to use a file chooser dialog to save a file, create a directory, and choose multiple files.

<td>Name</td> <td>Manufacturer</td> <td>Price</td> </tr> </thead> <tbody> <% var i = 0; %> <% foreach (var product in products) { %> <tr> <td><%= Html.ActionLink("Edit", "Edit", new { id = product.Id }) %></td> Uses expression<td> based templates <%= Html.DisplayFor(m => m[i].Name) %> </td> <td><%= Html.DisplayFor(m => m[i].ManufacturerName)%></td> <td><%= Html.DisplayFor(m => m[i].Price)%></td> </tr> <% i++; } %> </tbody> </table>