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Listing 24-7 shows marshal_as and marshal_context in action. Listing 24-7. Marshaling String Types #include "stdio.h" #include "msclr\marshal.h" using namespace System; using namespace msclr::interop; void main() { String ^hstr = gcnew String("Marshaling String^ to wchar_t*"); marshal_context^ context = gcnew marshal_context(); const wchar_t* pstr = context->marshal_as<const wchar_t*>(hstr); wprintf(L"%s\n", pstr); delete context; // from here on pstr is invalid const char* message = "Marshaling const char* to String^"; Console::WriteLine(marshal_as<String^>(message)); }

The While looping construct is useful should you wish to execute a block of statements until some terminating condition has been reached. Within the scope of a While loop, you will need to ensure this terminating event is indeed established; otherwise, you will be stuck in an endless loop. In the following example, the message "In While loop" will be continuously printed until the user terminates the loop by entering yes at the command prompt: Sub ExecuteWhileLoop() Dim userIsDone As String = "" ' Test on a lower-class copy of the string. While userIsDone.ToLower() <> "yes" Console.Write("Are you done [yes] [no]: ") userIsDone = Console.ReadLine() Console.WriteLine("In While loop") End While End Sub

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Defines a brush object, or in some cases, a pen object (which is really a brush in disguise) that is used to paint the border of a shape. These (and other) stroke-related properties control how lines are configured when drawing the border of a shape. In a majority of cases, these properties will configure the brush used to draw a border or line.

As I said earlier, it s trivial, as long as you use Table 24-1 to tell you which conversions are valid and whether to use a context. The result of MarshalEx.exe is shown in Figure 24-5.

Note If you forget to set the Fill and Stroke properties, WPF will give you invisible brushes and therefore the shape will not be visible on the screen!

All through the project, various deliverables should be produced RUP originally called these deliverables artifacts, and that is the term that has stuck in most people s minds However, after IBM took over RUP responsibilities, the term work products was used, and I will use this new term from now on in this book A work product could be an architecture model, the risk list, the iteration plan, and so on It is a representation of the results of a task This term encompasses all documents and models that we produce in the project A task is a unit of work, which provides a meaningful result A task is assigned to a role A role, in turn, defines a set of related skills, competencies, and responsibilities Let s consider an example.

Later in this chapter, you will learn to use Expression Blend and Expression Design to generate XAML descriptions of graphical data. For now, we will build a WPF application that can render shapes using XAML and VB 2010, and while doing so, learn a bit about the process of hit-testing. First of all, update the initial XAML of the <Window> to define a <DockPanel>, containing a (now empty) <ToolBar> and a <Canvas>. Note that we have given each contained item a fitting name via the Name property. <DockPanel LastChildFill="True"> <ToolBar DockPanel.Dock="Top" Name="mainToolBar" Height="50"> </ToolBar> <Canvas Background="LightBlue" Name="canvasDrawingArea"/> </DockPanel> Now, populate the <ToolBar> with a set of <RadioButton> objects, each of which contains a specific Shape derived class as content. Notice that each <RadioButton> is assigned to the same GroupName (to ensure mutual exclusivity) and is also given a fitting name: <ToolBar DockPanel.Dock="Top" Name="mainToolBar" Height="50"> <RadioButton Name="circleOption" GroupName="shapeSelection"> <Ellipse Fill="Green" Height="35" Width="35" /> </RadioButton> <RadioButton Name="rectOption" GroupName="shapeSelection"> <Rectangle Fill="Red" Height="35" Width="35" RadiusY="10" RadiusX="10" /> </RadioButton>

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