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size 16 // attributes elided for clarity here } Notice that both proxy types for HWND__ and tagRECT are defined as value types (they extend System::ValueType) However, the only information specifying the binary layout of the type is the size For the HWND__ type, the metadata size 4 is used because this type contains one 4-byte data member named unused Since tagRECT has four data members of 4 bytes in length, you can see that the metadata is size 16 Using this metadata, the JIT compiler knows how much memory to allocate on the stack for each local variable and each parameter A value type instance on the stack does not have an object header or any other runtime predefined data All bytes of a value on the stack can be gotten and set with IL instructions.

The IAuthorizeReadWrite interface defines a public interface for use by UI frameworks or other code that needs to determine what a user can do to an object s properties or methods. It looks like this: Public Interface IAuthorizeReadWrite Function CanWriteProperty(ByVal propertyName As String) As Boolean Function CanReadProperty(ByVal propertyName As String) As Boolean Function CanExecuteMethod(ByVal methodName As String) As Boolean End Interface This interface is implemented by BusinessBase and ReadOnlyBase and can be used against any business object with properties and methods.

A business object developer must specify the roles that are allowed and denied access to each property and method. The AuthorizationRules class maintains two lists of the roles. One list is shared across all instances of each business object type, and the other list is maintained for each individual object instance. The list maintained across all instances of a type is far more efficient in terms of memory and performance and should be the preferred approach. A business object developer must override the AddAuthorizationRules() method to associate shared per-type roles with properties and methods. The code in the business object looks like this:

This allows the C++/CLI compiler to ensure that local variables and parameters of this proxy type have the same binary layout as a local variable of the equivalent native type Since managed local variables and parameters are not relocated on the stack (in contrast to instances on the GC heap), an address to a local variable or parameter of this managed proxy type can be treated as a pointer to the equivalent native type The following program uses the RECT structure as a local variable and passes an address to this variable to GetWindowRect: // GetDesktopResolutioncpp // build with "cl /clr GetDesktopResolutioncpp" #include <windowsh>.

Protected Overrides Sub AddAuthorizationRules() AuthorizationRules.AllowRead(NameProperty, "Supervisor", "Guest") AuthorizationRules.DenyWrite(NameProperty, "Guest") AuthorizationRules.AllowExecute("DoWork", "Supervisor") End Sub This specifies that the Supervisor and Guest roles are allowed to read the Name property, but the Guest role is specifically not allowed to alter the property. And the Supervisor role is allowed to execute the business object s DoWork() method. The list of allowed and denied roles for each property and method is maintained within the AuthorizationRules object, which uses the types listed in Table 12-5 to store and retrieve the information.

Maintains a cache with an AuthorizationRulesManager object for each business object type Maintains a list of RolesForProperty objects, each one containing the roles for a specific property Maintains the lists of allowed and denied roles for reading and writing a specific property

using namespace System; #pragma comment (lib, "user32.lib") int main() { RECT rect; GetWindowRect(GetDesktopWindow(), &rect); int pixelsX = rect.right; int pixelsY = rect.bottom; Console::WriteLine("Resolution of desktop: {0} x {1}", pixelsX , pixelsY); return 0; } The following listing shows the IL code generated from the preceding source (with a few modifications to increase readability): .method assembly static int32 modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) main() cil managed { .vtentry 1 : 1 .maxstack 3 .locals ( int32 pixelsY, int32 pixelsX, valuetype tagRECT rect)

I m not going to walk through the code for these classes. They use the same multithreaded locking scheme I discuss in 11 and earlier in this chapter. The roles are maintained in Shared fields and so are shared across each AppDomain, and they are initialized once as the AppDomain starts up. This means they are initialized once for the lifetime of an application.

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